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Roman Teisserenc
EcoLab, Université de Toulouse, CNRS, Toulouse, France

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Journal article
Published: 25 February 2020 in Scientific Reports
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It is commonly assumed that methane (CH4) released by lakes into the atmosphere is mainly produced in anoxic sediment and transported by diffusion or ebullition through the water column to the surface of the lake. In contrast to that prevailing idea, it has been gradually established that the epilimnetic CH4 does not originate exclusively from sediments but is also locally produced or laterally transported from the littoral zone. Therefore, CH4 cycling in the epilimnion and the hypolimnion might not be as closely linked as previously thought. We utilized a high-resolution method used to determine dissolved CH4 concentration to analyze a Siberian lake in which epilimnetic and hypolimnetic CH4 cycles were fully segregated by a section of the water column where CH4 was not detected. This layer, with no detected CH4, was well below the oxycline and the photic zone and thus assumed to be anaerobic. However, on the basis of a diffusion-reaction model, molecular biology, and stable isotope analyses, we determined that this layer takes up all the CH4 produced in the sediments and the deepest section of the hypolimnion. We concluded that there was no CH4 exchange between the hypolimnion (dominated by methanotrophy and methanogenesis) and the epilimnion (dominated by methane lateral transport and/or oxic production), resulting in a vertically segregated lake internal CH4 cycle.

ACS Style

Frédéric Thalasso; Armando Sepulveda-Jauregui; Laure Gandois; Karla Martinez-Cruz; Oscar Gerardo-Nieto; María S. Astorga-España; Roman Teisserenc; Céline Lavergne; Nikita Tananaev; Maialen Barret; Léa Cabrol. Sub-oxycline methane oxidation can fully uptake CH4 produced in sediments: case study of a lake in Siberia. Scientific Reports 2020, 10, 1 -7.

AMA Style

Frédéric Thalasso, Armando Sepulveda-Jauregui, Laure Gandois, Karla Martinez-Cruz, Oscar Gerardo-Nieto, María S. Astorga-España, Roman Teisserenc, Céline Lavergne, Nikita Tananaev, Maialen Barret, Léa Cabrol. Sub-oxycline methane oxidation can fully uptake CH4 produced in sediments: case study of a lake in Siberia. Scientific Reports. 2020; 10 (1):1-7.

Chicago/Turabian Style

Frédéric Thalasso; Armando Sepulveda-Jauregui; Laure Gandois; Karla Martinez-Cruz; Oscar Gerardo-Nieto; María S. Astorga-España; Roman Teisserenc; Céline Lavergne; Nikita Tananaev; Maialen Barret; Léa Cabrol. 2020. "Sub-oxycline methane oxidation can fully uptake CH4 produced in sediments: case study of a lake in Siberia." Scientific Reports 10, no. 1: 1-7.

Journal article
Published: 07 January 2020 in Hydrology
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Permafrost hydrology is an emerging discipline, attracting increasing attention as the Arctic region is undergoing rapid change. However, the research domain of this discipline had never been explicitly formulated. Both ‘permafrost’ and ‘hydrology’ yield differing meanings across languages and scientific domains; hence, ‘permafrost hydrology’ serves as an example of cognitive linguistic relativity. From this point of view, the English and Russian usages of this term are explained. The differing views of permafrost as either an ecosystem class or a geographical region, and hydrology as a discipline concerned with either landscapes or generic water bodies, maintain a language-specific touch of the research in this field. Responding to a current lack of a unified approach, we propose a universal process-based definition of permafrost hydrology, based on a specific process assemblage, specific to permafrost regions and including: (1) Unconfined groundwater surface dynamics related to the active layer development; (2) water migration in the soil matrix, driven by phase transitions in the freezing active layer; and (3) transient water storage in both surface and subsurface compartments, redistributing runoff on various time scales. This definition fills the gap in existing scientific vocabulary. Other definitions from the field are revisited and discussed. The future of permafrost hydrology research is discussed, where the most important results would emerge at the interface between permafrost hydrology, periglacial geomorphology, and geocryology.

ACS Style

Nikita Tananaev; Roman Teisserenc; Matvey Debolskiy. Permafrost Hydrology Research Domain: Process-Based Adjustment. Hydrology 2020, 7, 6 .

AMA Style

Nikita Tananaev, Roman Teisserenc, Matvey Debolskiy. Permafrost Hydrology Research Domain: Process-Based Adjustment. Hydrology. 2020; 7 (1):6.

Chicago/Turabian Style

Nikita Tananaev; Roman Teisserenc; Matvey Debolskiy. 2020. "Permafrost Hydrology Research Domain: Process-Based Adjustment." Hydrology 7, no. 1: 6.

Journal article
Published: 19 November 2019 in Journal of Geophysical Research: Biogeosciences
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Mountains contain many small and fragmented peatlands within watersheds. As they are difficult to monitor, their role in the water and carbon cycle is often disregarded. This study aims to assess the stream organic carbon exports from a montane peatland and characterizes its contribution to the water chemistry in a headstream watershed. High frequency in situ monitoring of turbidity and fDOM were used to quantify respectively particulate (POC) and dissolved (DOC) organic carbon exports at the inlet and outlet of a peatland over three years in a French Pyrenean watershed (1343 m.a.s.l.). The DOC and POC signals are both highly dynamic, characterized by numerous short peaks lasting from a few hours to a few days. Forty‐six percent of the exports occurred during 9% of the time corresponding to the highest flows monitored at the outlet. Despite its small area (3%) within the watershed, the peatland contributes at least 63% of the DOC export at the outlet. The specific DOC flux ranges from 16.1±0.4 to 34.6±1.5 g.m2. yr‐1. POC contributes 17% of the total stream organic carbon exports from the watershed. As the frequency of extreme climatic events is expected to increase in the context of climate change, further studies should be conducted to understand the evolution of under‐estimated mountainous peatland carbon fluxes and their implication in the carbon cycle of headwaters.

ACS Style

T. Rosset; L. Gandois; G. Le Roux; R. Teisserenc; P. Durantez Jimenez; T. Camboulive; S. Binet. Peatland Contribution to Stream Organic Carbon Exports From a Montane Watershed. Journal of Geophysical Research: Biogeosciences 2019, 124, 3448 -3464.

AMA Style

T. Rosset, L. Gandois, G. Le Roux, R. Teisserenc, P. Durantez Jimenez, T. Camboulive, S. Binet. Peatland Contribution to Stream Organic Carbon Exports From a Montane Watershed. Journal of Geophysical Research: Biogeosciences. 2019; 124 (11):3448-3464.

Chicago/Turabian Style

T. Rosset; L. Gandois; G. Le Roux; R. Teisserenc; P. Durantez Jimenez; T. Camboulive; S. Binet. 2019. "Peatland Contribution to Stream Organic Carbon Exports From a Montane Watershed." Journal of Geophysical Research: Biogeosciences 124, no. 11: 3448-3464.

Preprint
Published: 13 May 2019
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Permafrost hydrology is an emerging discipline, attracting increasing attention as the Arctic region is undergoing rapid change. However, the research domain of this discipline had never been explicitly formulated. Both 'permafrost' and 'hydrology' yield differing meanings across languages and scientific domains, hence 'permafrost hydrology' serves as an example of linguistic relativity. The differing views of permafrost as either an ecosystem class or a geographical region, and hydrology as a discipline concerned with either landscapes or generic water bodies, maintain a language-specific touch in the definition of permafrost hydrology. From this point of view, the English and Russian usage of this term is explained. A universal process-based definition is further proposed, developed on a specific process assemblage, including (i) water table dynamics caused by migration of an upper aquitard through freeze–thaw processes; (ii) water migration in soil matrix, driven by phase transitions in the active layer; (iii) transient water storage in solid state in the subsurface compartment. This definition is shown to fill the niche in existing vocabulary, and other definitions from northern hydrology field are revisited.

ACS Style

Nikita Tananaev; Roman Teisserenc; Matvey Debolskiy. Permafrost Hydrology Research Domain: Process-Based Adjustment. 2019, 1 .

AMA Style

Nikita Tananaev, Roman Teisserenc, Matvey Debolskiy. Permafrost Hydrology Research Domain: Process-Based Adjustment. . 2019; ():1.

Chicago/Turabian Style

Nikita Tananaev; Roman Teisserenc; Matvey Debolskiy. 2019. "Permafrost Hydrology Research Domain: Process-Based Adjustment." , no. : 1.

Journal article
Published: 26 November 2018 in Proceedings of the National Academy of Sciences
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Midlatitude anthropogenic mercury (Hg) emissions and discharge reach the Arctic Ocean (AO) by atmospheric and oceanic transport. Recent studies suggest that Arctic river Hg inputs have been a potentially overlooked source of Hg to the AO. Observations on Hg in Eurasian rivers, which represent 80% of freshwater inputs to the AO, are quasi-inexistent, however, putting firm understanding of the Arctic Hg cycle on hold. Here, we present comprehensive seasonal observations on dissolved Hg (DHg) and particulate Hg (PHg) concentrations and fluxes for two large Eurasian rivers, the Yenisei and the Severnaya Dvina. We find large DHg and PHg fluxes during the spring flood, followed by a second pulse during the fall flood. We observe well-defined water vs. Hg runoff relationships for Eurasian and North American Hg fluxes to the AO and for Canadian Hg fluxes into the larger Hudson Bay area. Extrapolation to pan-Arctic rivers and watersheds gives a total Hg river flux to the AO of 44 ± 4 Mg per year (1σ), in agreement with the recent model-based estimates of 16 to 46 Mg per year and Hg/dissolved organic carbon (DOC) observation-based estimate of 50 Mg per year. The river Hg budget, together with recent observations on tundra Hg uptake and AO Hg dynamics, provide a consistent view of the Arctic Hg cycle in which continental ecosystems traffic anthropogenic Hg emissions to the AO via rivers, and the AO exports Hg to the atmosphere, to the Atlantic Ocean, and to AO marine sediments.

ACS Style

Jeroen E. Sonke; Roman Teisserenc; Lars-Eric Heimbürger-Boavida; Mariia V. Petrova; Nicolas Marusczak; Theo Le Dantec; Artem V. Chupakov; Chuxian Li; Colin P. Thackray; Elsie Sunderland; Nikita Tananaev; Oleg S. Pokrovsky. Eurasian river spring flood observations support net Arctic Ocean mercury export to the atmosphere and Atlantic Ocean. Proceedings of the National Academy of Sciences 2018, 115, E11586 -E11594.

AMA Style

Jeroen E. Sonke, Roman Teisserenc, Lars-Eric Heimbürger-Boavida, Mariia V. Petrova, Nicolas Marusczak, Theo Le Dantec, Artem V. Chupakov, Chuxian Li, Colin P. Thackray, Elsie Sunderland, Nikita Tananaev, Oleg S. Pokrovsky. Eurasian river spring flood observations support net Arctic Ocean mercury export to the atmosphere and Atlantic Ocean. Proceedings of the National Academy of Sciences. 2018; 115 (50):E11586-E11594.

Chicago/Turabian Style

Jeroen E. Sonke; Roman Teisserenc; Lars-Eric Heimbürger-Boavida; Mariia V. Petrova; Nicolas Marusczak; Theo Le Dantec; Artem V. Chupakov; Chuxian Li; Colin P. Thackray; Elsie Sunderland; Nikita Tananaev; Oleg S. Pokrovsky. 2018. "Eurasian river spring flood observations support net Arctic Ocean mercury export to the atmosphere and Atlantic Ocean." Proceedings of the National Academy of Sciences 115, no. 50: E11586-E11594.

Review
Published: 01 May 2018 in Science of The Total Environment
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Mountain catchments provide for the livelihood of more than half of humankind, and have become a key destination for tourist and recreation activities globally. Mountain ecosystems are generally considered to be less complex and less species diverse due to the harsh environmental conditions. As such, they are also more sensitive to the various impacts of the Anthropocene. For this reason, mountain regions may serve as sentinels of change and provide ideal ecosystems for studying climate and global change impacts on biodiversity. We here review different facets of anthropogenic impacts on mountain freshwater ecosystems. We put particular focus on micropollutants and their distribution and redistribution due to hydrological extremes, their direct influence on water quality and their indirect influence on ecosystem health via changes of freshwater species and their interactions. We show that those changes may drive pathogen establishment in new environments with harmful consequences for freshwater species, but also for the human population. Based on the reviewed literature, we recommend reconstructing the recent past of anthropogenic impact through sediment analyses, to focus efforts on small, but highly productive waterbodies, and to collect data on the occurrence and variability of microorganisms, biofilms, plankton species and key species, such as amphibians due to their bioindicator value for ecosystem health and water quality. The newly gained knowledge can then be used to develop a comprehensive framework of indicators to robustly inform policy and decision making on current and future risks for ecosystem health and human well-being.

ACS Style

Dirk S. Schmeller; Adeline Loyau; Kunshan Bao; Werner Brack; Antonis Chatzinotas; Francois De Vleeschouwer; Jan Friesen; Laure Gandois; Sophia V. Hansson; Marilen Haver; Gael Le Roux; Ji Shen; Roman Teisserenc; Vance T. Vredenburg. People, pollution and pathogens – Global change impacts in mountain freshwater ecosystems. Science of The Total Environment 2018, 622-623, 756 -763.

AMA Style

Dirk S. Schmeller, Adeline Loyau, Kunshan Bao, Werner Brack, Antonis Chatzinotas, Francois De Vleeschouwer, Jan Friesen, Laure Gandois, Sophia V. Hansson, Marilen Haver, Gael Le Roux, Ji Shen, Roman Teisserenc, Vance T. Vredenburg. People, pollution and pathogens – Global change impacts in mountain freshwater ecosystems. Science of The Total Environment. 2018; 622-623 ():756-763.

Chicago/Turabian Style

Dirk S. Schmeller; Adeline Loyau; Kunshan Bao; Werner Brack; Antonis Chatzinotas; Francois De Vleeschouwer; Jan Friesen; Laure Gandois; Sophia V. Hansson; Marilen Haver; Gael Le Roux; Ji Shen; Roman Teisserenc; Vance T. Vredenburg. 2018. "People, pollution and pathogens – Global change impacts in mountain freshwater ecosystems." Science of The Total Environment 622-623, no. : 756-763.

Journal article
Published: 10 June 2017 in Water
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Modification of the hydrological cycle and, subsequently, of other global cycles is expected in Arctic watersheds owing to global change. Future climate scenarios imply widespread permafrost degradation caused by an increase in air temperature, and the expected effect on permafrost hydrology is immense. This study aims at analyzing, and quantifying the daily water transfer in the largest Arctic river system, the Yenisei River in central Siberia, Russia, partially underlain by permafrost. The semi-distributed SWAT (Soil and Water Assessment Tool) hydrological model has been calibrated and validated at a daily time step in historical discharge simulations for the 2003–2014 period. The model parameters have been adjusted to embrace the hydrological features of permafrost. SWAT is shown capable to estimate water fluxes at a daily time step, especially during unfrozen periods, once are considered specific climatic and soils conditions adapted to a permafrost watershed. The model simulates average annual contribution to runoff of 263 millimeters per year (mm yr−1) distributed as 152 mm yr−1 (58%) of surface runoff, 103 mm yr−1 (39%) of lateral flow and 8 mm yr−1 (3%) of return flow from the aquifer. These results are integrated on a reduced basin area downstream from large dams and are closer to observations than previous modeling exercises.

ACS Style

Clément Fabre; Sabine Sauvage; Nikita Tananaev; Raghavan Srinivasan; Roman Teisserenc; José Miguel Sánchez Pérez. Using Modeling Tools to Better Understand Permafrost Hydrology. Water 2017, 9, 418 .

AMA Style

Clément Fabre, Sabine Sauvage, Nikita Tananaev, Raghavan Srinivasan, Roman Teisserenc, José Miguel Sánchez Pérez. Using Modeling Tools to Better Understand Permafrost Hydrology. Water. 2017; 9 (6):418.

Chicago/Turabian Style

Clément Fabre; Sabine Sauvage; Nikita Tananaev; Raghavan Srinivasan; Roman Teisserenc; José Miguel Sánchez Pérez. 2017. "Using Modeling Tools to Better Understand Permafrost Hydrology." Water 9, no. 6: 418.

Original research article
Published: 15 February 2017 in Frontiers in Marine Science
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A number of recent studies have documented that pyrogenic carbon (PyC) is an integral and significant proportion of DOM in worldwide rivers. This material originates from all fractions of the PyC continuum, from highly condensed PyC to more functionalized components that retain some structural identity of fuel molecules. Understanding the transfer of PyC to river systems is paramount for Arctic regions, given the projected increase in frequency and intensity of forest fires within these ecosystems. However, the environmental distribution and concentration of soluble and particulate PyC, parameters that govern the overall fate of PyC in aquatic systems, has so far been unstudied. Here, we analyze the concentration and phase distribution of the anhydrosugar biomarker levoglucosan, as a proxy for low-temperature PyC, in two high-latitude river systems: a small sub-Arctic Canadian river, the Great Whale River in northern Québec, and the largest Arctic River, the Yenisei River in north-central Siberia. Low-temperature PyC, as estimated by levoglucosan concentrations, is exported predominantly in the dissolved phase. Peak export of low-temperature PyC occurs during the spring freshet period in both rivers. Seasonal variability of dissolved and particulate PyC export in each river elucidated that the export of PyC in the particulate and dissolved phases were temporally decoupled throughout the peak discharge events. While the present work confirms that levoglucosan is exported in particulate phase at a high enough level to enter sedimentary deposits and record historical wildfire signatures, as the phase distribution varies between rivers and during different flow regimes, spatial and temporal differences may affect the usage of levoglucosan as a PyC proxy in depositional settings.

ACS Style

Allison N. Myers-Pigg; Patrick Louchouarn; Roman Teisserenc. Flux of Dissolved and Particulate Low-Temperature Pyrogenic Carbon from Two High-Latitude Rivers across the Spring Freshet Hydrograph. Frontiers in Marine Science 2017, 4, 1 .

AMA Style

Allison N. Myers-Pigg, Patrick Louchouarn, Roman Teisserenc. Flux of Dissolved and Particulate Low-Temperature Pyrogenic Carbon from Two High-Latitude Rivers across the Spring Freshet Hydrograph. Frontiers in Marine Science. 2017; 4 ():1.

Chicago/Turabian Style

Allison N. Myers-Pigg; Patrick Louchouarn; Roman Teisserenc. 2017. "Flux of Dissolved and Particulate Low-Temperature Pyrogenic Carbon from Two High-Latitude Rivers across the Spring Freshet Hydrograph." Frontiers in Marine Science 4, no. : 1.

Article
Published: 11 November 2016 in Water, Air, & Soil Pollution
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Agricultural practices are the main source of water contamination in rural areas. Rainfall events, and subsequently, soil leaching and storm runoff are mainly controlling the transfer of pollutants from diffuse sources in watersheds during floods. These periods are also very important to better understand their dynamics, particularly their different soil-river transfer pathways (surface runoff SR, subsurface runoff SSR, and groundwater flow GF). This study focuses on riverine transfers of both pesticides and trace elements. High-resolution monitoring of water discharge and water sampling were performed during a flood event that occured in May 2010 in an agricultural catchment of SW France. Chemical composition of major and trace elements, silica, alkalinity, pH and conductivity, DOC and POC, TSM, and commonly used pesticides were analyzed with a high sampling frequency. The different stream flow components (SR, SSR, and GF) were assessed using two independent hydrograph separation methods: a hydrological approach based on Maillet’s formula (1905) for the recession period and a chemical approach based on physico-chemical tracers, TSM for SR and PO43− for GF. Both methods exhibited important contributions of SR (33 %) and SSR (40 %) to the total riverine pollutant transfers. The contribution of different components was also visible using concentration-discharge relationships which exhibited hysteresis phenomenon between the rising and the falling limbs of the hydrograph. Higher concentrations during the rising period (clockwise hysteresis) were characteristic of pollutants mainly exported by SR (trifluralin, Cd). Anticlockwise hysteresis with higher concentration during the recession period showed pollutants mainly exported by SSR (metolachlor, Cu). Moreover, significant relationships were highlighted between the controlling factors (DOC, POC, and TSM) and SR, SSR, and GF contributions: DOC and the complexed pollutants were highly correlated to SSR while POC, TSM, and the adsorbed pollutants were linked to SR. During the flood, Kd of most pollutants increased, particularly at the beginning, and therefore, future studies should investigate their availability to living organisms and thus their toxicity. An additional characteristic equation between Kd and Kow of the different pesticides was proposed to help future management, modelling, and estimation of pollutant transfers during floods.

ACS Style

Desiree El Azzi; Jean-Luc Probst; Roman Teisserenc; Georges Merlina; David Baqué; Frédéric Julien; Virginie Payre-Suc; Agnès Maritchù Guiresse. Trace Element and Pesticide Dynamics During a Flood Event in the Save Agricultural Watershed: Soil-River Transfer Pathways and Controlling Factors. Water, Air, & Soil Pollution 2016, 227, 442 .

AMA Style

Desiree El Azzi, Jean-Luc Probst, Roman Teisserenc, Georges Merlina, David Baqué, Frédéric Julien, Virginie Payre-Suc, Agnès Maritchù Guiresse. Trace Element and Pesticide Dynamics During a Flood Event in the Save Agricultural Watershed: Soil-River Transfer Pathways and Controlling Factors. Water, Air, & Soil Pollution. 2016; 227 (12):442.

Chicago/Turabian Style

Desiree El Azzi; Jean-Luc Probst; Roman Teisserenc; Georges Merlina; David Baqué; Frédéric Julien; Virginie Payre-Suc; Agnès Maritchù Guiresse. 2016. "Trace Element and Pesticide Dynamics During a Flood Event in the Save Agricultural Watershed: Soil-River Transfer Pathways and Controlling Factors." Water, Air, & Soil Pollution 227, no. 12: 442.

Journal article
Published: 28 September 2016 in Remote Sensing
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In Arctic regions, a major concern is the release of carbon from melting permafrost that could greatly exceed current human carbon emissions. Arctic rivers drain these organic-rich watersheds (Ob, Lena, Yenisei, Mackenzie, Yukon) but field measurements at the outlets of these great Arctic rivers are constrained by limited accessibility of sampling sites. In particular, the highest dissolved organic carbon (DOC) fluxes are observed throughout the ice breakup period that occurs over a short two to three-week period in late May or early June during the snowmelt-generated peak flow. The colored fraction of dissolved organic carbon (DOC) which absorbs UV and visible light is designed as chromophoric dissolved organic matter (CDOM). It is highly correlated to DOC in large arctic rivers and streams, allowing for remote sensing to monitor DOC concentrations from satellite imagery. High temporal and spatial resolutions remote sensing tools are highly relevant for the study of DOC fluxes in a large Arctic river. The high temporal resolution allows for correctly assessing this highly dynamic process, especially the spring freshet event (a few weeks in May). The high spatial resolution allows for assessing the spatial variability within the stream and quantifying DOC transfer during the ice break period when the access to the river is almost impossible. In this study, we develop a CDOM retrieval algorithm at a high spatial and a high temporal resolution in the Yenisei River. We used extensive DOC and DOM spectral absorbance datasets from 2014 and 2015. Twelve SPOT5 (Take5) and Landsat 8 (OLI) images from 2014 and 2015 were examined for this investigation. Relationships between CDOM and spectral variables were explored using linear models (LM). Results demonstrated the capacity of a CDOM algorithm retrieval to monitor DOC fluxes in the Yenisei River during a whole open water season with a special focus on the peak flow period. Overall, future Sentinel2/Landsat8 synergies are promising to monitor DOC fluxes in Arctic rivers and advance our understanding of the Earth’s carbon cycle.

ACS Style

Pierre-Alexis Herrault; Laure Gandois; Simon Gascoin; Nikita Tananaev; Théo Le Dantec; Roman Teisserenc. Using High Spatio-Temporal Optical Remote Sensing to Monitor Dissolved Organic Carbon in the Arctic River Yenisei. Remote Sensing 2016, 8, 803 .

AMA Style

Pierre-Alexis Herrault, Laure Gandois, Simon Gascoin, Nikita Tananaev, Théo Le Dantec, Roman Teisserenc. Using High Spatio-Temporal Optical Remote Sensing to Monitor Dissolved Organic Carbon in the Arctic River Yenisei. Remote Sensing. 2016; 8 (10):803.

Chicago/Turabian Style

Pierre-Alexis Herrault; Laure Gandois; Simon Gascoin; Nikita Tananaev; Théo Le Dantec; Roman Teisserenc. 2016. "Using High Spatio-Temporal Optical Remote Sensing to Monitor Dissolved Organic Carbon in the Arctic River Yenisei." Remote Sensing 8, no. 10: 803.

Letter
Published: 01 March 2016 in Environmental Research Letters
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As the permafrost region warms, its large organic carbon pool will be increasingly vulnerable to decomposition, combustion, and hydrologic export. Models predict that some portion of this release will be offset by increased production of Arctic and boreal biomass; however, the lack of robust estimates of net carbon balance increases the risk of further overshooting international emissions targets. Precise empirical or model-based assessments of the critical factors driving carbon balance are unlikely in the near future, so to address this gap, we present estimates from 98 permafrost-region experts of the response of biomass, wildfire, and hydrologic carbon flux to climate change. Results suggest that contrary to model projections, total permafrost-region biomass could decrease due to water stress and disturbance, factors that are not adequately incorporated in current models. Assessments indicate that end-of-the-century organic carbon release from Arctic rivers and collapsing coastlines could increase by 75% while carbon loss via burning could increase four-fold. Experts identified water balance, shifts in vegetation community, and permafrost degradation as the key sources of uncertainty in predicting future system response. In combination with previous findings, results suggest the permafrost region will become a carbon source to the atmosphere by 2100 regardless of warming scenario but that 65%–85% of permafrost carbon release can still be avoided if human emissions are actively reduced.

ACS Style

Benjamin Abbott; Jeremy B Jones; Edward A G Schuur; F Stuart Chapin Iii; William B Bowden; M Syndonia Bret-Harte; Howard E Epstein; Michael Flannigan; Tamara K Harms; Teresa N Hollingsworth; Michelle C Mack; A David McGuire; Susan M Natali; Adrian V Rocha; Suzanne Tank; Merritt R Turetsky; Jorien E Vonk; Kimberly Wickland; George R Aiken; Heather D Alexander; Rainer M W Amon; Brian Benscoter; Yves Bergeron; Kevin Bishop; Olivier Blarquez; Benjamin Bond-Lamberty; Amy L Breen; Ishi Buffam; Yihua Cai; Christopher Carcaillet; Sean K Carey; Jing M Chen; Han Chen; Torben Christensen; Lee Cooper; J Hans C Cornelissen; William J De Groot; Thomas Henry DeLuca; Ellen Dorrepaal; Ned Fetcher; Jacques Finlay; Bruce C Forbes; Nancy H F French; Sylvie Gauthier; Martin P Girardin; Scott Goetz; Johann G Goldammer; Laura Gough; Paul Grogan; Laodong Guo; Philip Higuera; Larry Hinzman; Feng Sheng Hu; Gustaf Hugelius; Elchin Jafarov; Randi Jandt; Jill Johnstone; Jan Karlsson; Eric S Kasischke; Gerhard Kattner; Ryan Kelly; Frida Keuper; George W Kling; Pirkko Kortelainen; Jari Kouki; Peter Kuhry; Hjalmar Laudon; Isabelle Laurion; Robie Macdonald; Paul J Mann; Pertti J Martikainen; James McClelland; Ulf Molau; Steven F Oberbauer; David Olefeldt; David Paré; Marc-André Parisien; Serge Payette; Changhui Peng; Oleg S Pokrovsky; Edward Rastetter; Peter A Raymond; Martha K Raynolds; Guillermo Rein; James F Reynolds; Martin Robards; Brendan M Rogers; Christina Schädel; Kevin Schaefer; Inger Kappel Schmidt; Anatoly Shvidenko; Jasper Sky; Robert G M Spencer; Gregory Starr; Robert G Striegl; Roman Teisserenc; Lars J. Tranvik; Tarmo Virtanen; Jeffrey M Welker; Sergei Zimov. Biomass offsets little or none of permafrost carbon release from soils, streams, and wildfire: an expert assessment. Environmental Research Letters 2016, 11, 034014 .

AMA Style

Benjamin Abbott, Jeremy B Jones, Edward A G Schuur, F Stuart Chapin Iii, William B Bowden, M Syndonia Bret-Harte, Howard E Epstein, Michael Flannigan, Tamara K Harms, Teresa N Hollingsworth, Michelle C Mack, A David McGuire, Susan M Natali, Adrian V Rocha, Suzanne Tank, Merritt R Turetsky, Jorien E Vonk, Kimberly Wickland, George R Aiken, Heather D Alexander, Rainer M W Amon, Brian Benscoter, Yves Bergeron, Kevin Bishop, Olivier Blarquez, Benjamin Bond-Lamberty, Amy L Breen, Ishi Buffam, Yihua Cai, Christopher Carcaillet, Sean K Carey, Jing M Chen, Han Chen, Torben Christensen, Lee Cooper, J Hans C Cornelissen, William J De Groot, Thomas Henry DeLuca, Ellen Dorrepaal, Ned Fetcher, Jacques Finlay, Bruce C Forbes, Nancy H F French, Sylvie Gauthier, Martin P Girardin, Scott Goetz, Johann G Goldammer, Laura Gough, Paul Grogan, Laodong Guo, Philip Higuera, Larry Hinzman, Feng Sheng Hu, Gustaf Hugelius, Elchin Jafarov, Randi Jandt, Jill Johnstone, Jan Karlsson, Eric S Kasischke, Gerhard Kattner, Ryan Kelly, Frida Keuper, George W Kling, Pirkko Kortelainen, Jari Kouki, Peter Kuhry, Hjalmar Laudon, Isabelle Laurion, Robie Macdonald, Paul J Mann, Pertti J Martikainen, James McClelland, Ulf Molau, Steven F Oberbauer, David Olefeldt, David Paré, Marc-André Parisien, Serge Payette, Changhui Peng, Oleg S Pokrovsky, Edward Rastetter, Peter A Raymond, Martha K Raynolds, Guillermo Rein, James F Reynolds, Martin Robards, Brendan M Rogers, Christina Schädel, Kevin Schaefer, Inger Kappel Schmidt, Anatoly Shvidenko, Jasper Sky, Robert G M Spencer, Gregory Starr, Robert G Striegl, Roman Teisserenc, Lars J. Tranvik, Tarmo Virtanen, Jeffrey M Welker, Sergei Zimov. Biomass offsets little or none of permafrost carbon release from soils, streams, and wildfire: an expert assessment. Environmental Research Letters. 2016; 11 (3):034014.

Chicago/Turabian Style

Benjamin Abbott; Jeremy B Jones; Edward A G Schuur; F Stuart Chapin Iii; William B Bowden; M Syndonia Bret-Harte; Howard E Epstein; Michael Flannigan; Tamara K Harms; Teresa N Hollingsworth; Michelle C Mack; A David McGuire; Susan M Natali; Adrian V Rocha; Suzanne Tank; Merritt R Turetsky; Jorien E Vonk; Kimberly Wickland; George R Aiken; Heather D Alexander; Rainer M W Amon; Brian Benscoter; Yves Bergeron; Kevin Bishop; Olivier Blarquez; Benjamin Bond-Lamberty; Amy L Breen; Ishi Buffam; Yihua Cai; Christopher Carcaillet; Sean K Carey; Jing M Chen; Han Chen; Torben Christensen; Lee Cooper; J Hans C Cornelissen; William J De Groot; Thomas Henry DeLuca; Ellen Dorrepaal; Ned Fetcher; Jacques Finlay; Bruce C Forbes; Nancy H F French; Sylvie Gauthier; Martin P Girardin; Scott Goetz; Johann G Goldammer; Laura Gough; Paul Grogan; Laodong Guo; Philip Higuera; Larry Hinzman; Feng Sheng Hu; Gustaf Hugelius; Elchin Jafarov; Randi Jandt; Jill Johnstone; Jan Karlsson; Eric S Kasischke; Gerhard Kattner; Ryan Kelly; Frida Keuper; George W Kling; Pirkko Kortelainen; Jari Kouki; Peter Kuhry; Hjalmar Laudon; Isabelle Laurion; Robie Macdonald; Paul J Mann; Pertti J Martikainen; James McClelland; Ulf Molau; Steven F Oberbauer; David Olefeldt; David Paré; Marc-André Parisien; Serge Payette; Changhui Peng; Oleg S Pokrovsky; Edward Rastetter; Peter A Raymond; Martha K Raynolds; Guillermo Rein; James F Reynolds; Martin Robards; Brendan M Rogers; Christina Schädel; Kevin Schaefer; Inger Kappel Schmidt; Anatoly Shvidenko; Jasper Sky; Robert G M Spencer; Gregory Starr; Robert G Striegl; Roman Teisserenc; Lars J. Tranvik; Tarmo Virtanen; Jeffrey M Welker; Sergei Zimov. 2016. "Biomass offsets little or none of permafrost carbon release from soils, streams, and wildfire: an expert assessment." Environmental Research Letters 11, no. 3: 034014.

Research article
Published: 25 August 2014 in International Journal of Ecology
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Heavy metals are potentially toxic to human life and the environment. Metal toxicity depends on chemical associations in soils. For this reason, determining the chemical form of a metal in soils is important to evaluate its mobility and the potential accumulation. The aim of this examination is to evaluate the accumulation potential ofPetunia x hybridaas a flower crop for three metals, namely, copper (Cu), lead (Pb), and nickel (Ni). Trace metals (Zn, Cu, and Pb) in the soils were partitioned by a sequential extraction procedure into H2O extractable (F1), 1 M CH3COONa extractable (F2). Chemical fractionation showed that F1 and F2 fraction of the metals were near 1% and residue was the dominant form for Zn, Cu, and Pb in all samples. Using fluorescence method allowed us to estimate condition of the plants by adding metals. As result of plant and soil analysis, we can conclude thatPetuniahas Cu, Zn, and Ni tolerance and accumulation. Therefore,Petuniahas the potential to serve as a model species for developing herbaceous, ornamental plants for phytoremediation.

ACS Style

Lydia Bondareva; Roman Teisserenc; Nina Pakharkova; Aleksandr Shubin; Théo Le Dantec; Le&#xef Renon; Ivan Svoboda. Assessment of the Bioavailability of Cu, Pb, and Zn throughPetunia axillarisin Contaminated Soils. International Journal of Ecology 2014, 2014, 1 -6.

AMA Style

Lydia Bondareva, Roman Teisserenc, Nina Pakharkova, Aleksandr Shubin, Théo Le Dantec, Le&#xef Renon, Ivan Svoboda. Assessment of the Bioavailability of Cu, Pb, and Zn throughPetunia axillarisin Contaminated Soils. International Journal of Ecology. 2014; 2014 ():1-6.

Chicago/Turabian Style

Lydia Bondareva; Roman Teisserenc; Nina Pakharkova; Aleksandr Shubin; Théo Le Dantec; Le&#xef Renon; Ivan Svoboda. 2014. "Assessment of the Bioavailability of Cu, Pb, and Zn throughPetunia axillarisin Contaminated Soils." International Journal of Ecology 2014, no. : 1-6.

Journal article
Published: 01 July 2014 in Geochimica et Cosmochimica Acta
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ACS Style

Laure Gandois; R. Teisserenc; A.R. Cobb; H.I. Chieng; L.B.L. Lim; A.S. Kamariah; A. Hoyt; C.F. Harvey. Origin, composition, and transformation of dissolved organic matter in tropical peatlands. Geochimica et Cosmochimica Acta 2014, 137, 35 -47.

AMA Style

Laure Gandois, R. Teisserenc, A.R. Cobb, H.I. Chieng, L.B.L. Lim, A.S. Kamariah, A. Hoyt, C.F. Harvey. Origin, composition, and transformation of dissolved organic matter in tropical peatlands. Geochimica et Cosmochimica Acta. 2014; 137 ():35-47.

Chicago/Turabian Style

Laure Gandois; R. Teisserenc; A.R. Cobb; H.I. Chieng; L.B.L. Lim; A.S. Kamariah; A. Hoyt; C.F. Harvey. 2014. "Origin, composition, and transformation of dissolved organic matter in tropical peatlands." Geochimica et Cosmochimica Acta 137, no. : 35-47.

Journal article
Published: 27 August 2013 in Biogeochemistry
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Sediments from two recently (40 years) flooded lakes (Gabbro lake and Sandgirt lake) and an unflooded lake (Atikonak lake) were sampled to investigate the effects of reservoir impoundment on mercury (Hg) and terrigenous organic matter (TOM) loading in the Churchill Falls Hydroelectric complex in Labrador, Canada. Lignin biomarkers in TOM, which exclusively derive from terrestrial vegetation, were used as biomarkers for the presence and source origin of TOM—and for Hg due to their close associations—in sediments. In the two flooded Gabbro and Sandgirt lakes, we observed drastic increases in total mercury concentrations, T-[Hg], in sediments, which temporally coincided with the time of reservoir impoundment as assessed by Pb age dating. In the natural Atikonak lake sediments, on the other hand, T-[Hg] showed no such step-increase but gradually and slowly increased until present. T-[Hg] increases in lake sediments after flooding were also associated with a change in the nature of TOM: biomarker signatures changed to typical signatures of TOM from vegetated terrestrial landscape surrounding the lakes, and indicate a change to TOM that was much less degraded and typical of forest soil organic horizons. We conclude that T-[Hg] increase in the sediments of the two flooded reservoirs was the result of flooding of surrounding forests, whereby mainly surface organic horizons and upper soil horizons were prone to erosion and subsequent re-sedimentation in the reservoirs. The fact that T-[Hg] was still enriched 40 years after reservoir impoundment indicates prolonged response time of lake Hg and sediment loadings after reservoir impoundments.

ACS Style

Roman Teisserenc; Marc Lucotte; René Canuel; Matthieu Moingt; Daniel Obrist. Combined dynamics of mercury and terrigenous organic matter following impoundment of Churchill Falls Hydroelectric Reservoir, Labrador. Biogeochemistry 2013, 118, 21 -34.

AMA Style

Roman Teisserenc, Marc Lucotte, René Canuel, Matthieu Moingt, Daniel Obrist. Combined dynamics of mercury and terrigenous organic matter following impoundment of Churchill Falls Hydroelectric Reservoir, Labrador. Biogeochemistry. 2013; 118 (1):21-34.

Chicago/Turabian Style

Roman Teisserenc; Marc Lucotte; René Canuel; Matthieu Moingt; Daniel Obrist. 2013. "Combined dynamics of mercury and terrigenous organic matter following impoundment of Churchill Falls Hydroelectric Reservoir, Labrador." Biogeochemistry 118, no. 1: 21-34.

Journal article
Published: 02 July 2013 in Rapid Communications in Mass Spectrometry
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RATIONALEThe contribution of tropical coastal rivers to the global carbon budget remains unmeasured, despite their high water dynamics, i.e. higher run‐off with their basin characteristic of warm temperature. Two rivers draining the western part of the Western Ghats, the Swarna (length 80 km) and Nethravati (147 km) Rivers, were studied for water and carbon cycles.METHODSThe stable isotope ratios of oxygen (δ18O values), hydrogen (δ2H values) and carbon (δ13C values) were used to understand the water circulation, the weathering processes and the carbon biogeochemical cycle. The river water samples were collected during the dry post‐monsoonal season (November 2011).RESULTSThe δ18O and δ2H values of river water suggested that the monsoonal vapour source and its high recycling have a dominant role because of the orographical and tropical conditions. The absence of calcareous rocks has led to dissolved inorganic carbon (DIC) mainly originating from atmospheric/soil CO2, via rock‐weathering processes, and the low soil organic matter combined with high run‐off intensity has led to low riverine dissolved organic carbon (DOC) contents. The δ13C values increase from upstream to downstream and decrease with increasing pCO2. There is a positive relationship between the δ13CDIC values and the DOC concentrations in these two rivers that is contrary to that in most of the studied rivers of the world.CONCLUSIONSThe higher evapotranspiration supported by tropical conditions suggests that there are higher vapour recycling process in the Swarna and Nethravati basins as studied from the water δ18O and δ2H values. The basin characteristics of higher rainfall/run‐off accompanied by warm temperature suggest that the δ13C value of riverine DIC is mainly controlled by the weathering of source rocks (silicates) with variation along the river course by CO2 degassing from the river water to the atmosphere and is less dominated by the oxidation of DOC. Copyright © 2013 John Wiley & Sons, Ltd.

ACS Style

M. Tripti; L. Lambs; T. Otto; G. P. Gurumurthy; R. Teisserenc; I. Moussa; K. Balakrishna; J. L. Probst. First assessment of water and carbon cycles in two tropical coastal rivers of south-west India: an isotopic approach. Rapid Communications in Mass Spectrometry 2013, 27, 1681 -1689.

AMA Style

M. Tripti, L. Lambs, T. Otto, G. P. Gurumurthy, R. Teisserenc, I. Moussa, K. Balakrishna, J. L. Probst. First assessment of water and carbon cycles in two tropical coastal rivers of south-west India: an isotopic approach. Rapid Communications in Mass Spectrometry. 2013; 27 (15):1681-1689.

Chicago/Turabian Style

M. Tripti; L. Lambs; T. Otto; G. P. Gurumurthy; R. Teisserenc; I. Moussa; K. Balakrishna; J. L. Probst. 2013. "First assessment of water and carbon cycles in two tropical coastal rivers of south-west India: an isotopic approach." Rapid Communications in Mass Spectrometry 27, no. 15: 1681-1689.

Journal article
Published: 28 February 2011 in Applied Geochemistry
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The presence of Hg in the fish of the lakes from the Cu–Zn–Au mining region of Chibougamau (Canada) represents a serious source of concern for the health of local sports and subsistence fishers. This study focuses on identifying the origin of Hg present in the sediments of lakes with mine wastes stored in tailing facilities located on their shores. In addition to C/N ratios and determination of total Hg, Methyl Hg and other metals, a series of lignin biomarkers were used to contrast the history of the mining contamination with the nature and the intensity of terrigenous organic matter (TOM) inputs from the watersheds to the sampled lakes. It appears that sediments located nearest to mine tailings are as expected most enriched in total Hg and other metals (Cu, As, Al, Fe, Pb). Nevertheless, the presence of only small amounts of refractory TOM in these contaminated sediments could explain why only a very small fraction of Hg is found as Methyl Hg. In sediments with little or no impact by mining activities, a relationship was observed between logging activities in the lake watershed and increased TOM derived from inorganic gymnosperms soils horizons and increased Hg transport to the lakes. Nevertheless, it appears that the additional TOM transported to logged lakes is refractory enough not to promote high levels of Methyl Hg. The highest fractions of Methyl Hg relative to total Hg in lake sediments of the studied area were thus observed in relatively pristine environments where least degraded TOM is brought from the watersheds.

ACS Style

Stéphane Petit; Marc Lucotte; Roman Teisserenc. Mercury sources and bioavailability in lakes located in the mining district of Chibougamau, eastern Canada. Applied Geochemistry 2011, 26, 230 -241.

AMA Style

Stéphane Petit, Marc Lucotte, Roman Teisserenc. Mercury sources and bioavailability in lakes located in the mining district of Chibougamau, eastern Canada. Applied Geochemistry. 2011; 26 (2):230-241.

Chicago/Turabian Style

Stéphane Petit; Marc Lucotte; Roman Teisserenc. 2011. "Mercury sources and bioavailability in lakes located in the mining district of Chibougamau, eastern Canada." Applied Geochemistry 26, no. 2: 230-241.

Journal article
Published: 01 November 2010 in Geochimica et Cosmochimica Acta
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Terrigenous organic matter (TOM) transfer from a watershed to a lake plays a key role in contaminants fate and greenhouse gazes emission in these aquatic ecosystems. In this study, we linked physiographic and vegetation characteristics of a watershed with TOM nature deposited in lake sediments. TOM was characterized using lignin biomarkers as indicators of TOM sources and state of degradation. Geographical information system (GIS) also allowed us to integrate and describe the landscape morpho-edaphic characteristics of a defined drainage basin. Combining these tools we found a significant and positive relationship ( R 2 = 0.65, p < 0.002) between mean slope of the watershed and the terrigenous fraction estimated by Λ8 in recent sediments. The mean slope also correlated with the composition of TOM in recent sediments as P/(V + S) and 3,5Bd/V ratios significantly decreased with the steepness of the watersheds ( R 2 = 0.57, p < 0.021 and R 2 = 0.71, p < 0.004, respectively). More precisely, areas with slopes comprised between 4° and 10° have a major influence on TOM inputs to lakes. The vegetation composition of each watershed influenced the composition of recent sediments of the sampled lakes. The increasing presence of angiosperm trees in the watershed influenced the export of TOM to the lake as Λ8 increased significantly with the presence of this type of vegetation ( R 2 = 0.44, p < 0.019). A similar relationship was also observed with S/V ratios, an indicator of angiosperm sources for TOM. The type of vegetation also greatly influenced the degradation state of OM. In this study, we were able to determine that low-sloped areas (0–2°) act as buffer zones for lignin inputs and by extension for TOM loading to sediments. The relative contribution of TOM from the soil organic horizons also increased in steeper watersheds. This study has significant implications in our understanding of the fate of TOM in lacustrine ecosystems. 1 Introduction Lakes represent almost 2.8% of our planet’s terrestrial surface area ( Downing et al., 2006 ). Over the last decades, an increasing scientific interest has focused on organic matter (OM) dynamics within lake ecosystems. Two major environmental issues: the fate of contaminants and climate change, drive this scientific interest. First, the role of OM, particularly TOM, is crucial to the contribution of contaminants in lakes ( Lindqvist et al., 1991; Coquery and Welbourn, 1995; Grigal, 2002; Ouellet et al., 2009 ). Second, OM dynamics is the central factor controlling carbon dioxide (CO 2 ) and methane (CH 4 ) production in these inland aquatic ecosystems. Since Cole et al.’s (1994) study on CO 2 supersaturation in lake surface waters, several authors have addressed the cycling of OM in lakes within the scope of carbon transfers to the atmosphere and oceans ( Algesten et al., 2004; Cole et al., 2007; Jonsson et al., 2007 ). These issues increased the need to reinforce our understandings of terrestrial and aquatic ecosystems linkage ( Chapin et al., 2006; Cole et al., 2007; Prairie, 2008 ). Recently, increased attention has been given to the understanding of the parameters controlling the transfer of TOM from watersheds to lakes. At the watershed level, both physiographic and edaphic parameters influence TOM inputs to lakes. As such, the mean slope declination, the drainage area, the lake surface area, the type of soil, and the vegetation composition appear as dominant variables ( Rasmussen et al., 1989; D’arcy and Carignan, 1997; Rantakari et al., 2004; Sobek et al., 2006 ). A particular emphasis has been placed on understanding the role of these variables on the composition of dissolved and particulate organic carbon (DOC and POC), however, few studies use sediment records to address the question ( Müller et al., 1998 ). Compared to the water column, sediment records have the potential to integrate time variability. Sediments sampled in the maximal depositional zone (i.e. focal zone) also integrate spatial variation of overall lake–watershed organic matter (OM) dynamics ( Håkanson and Jansson, 1983 ). Furthermore, organic matter buried in lake sediments represents a carbon sink that remains stable for millennia ( Cole et al., 2007 ). Based on these specificities, we chose to determine the watershed influence on the composition of specific TOM biomarkers as recorded by recent lake sediments. In order to achieve this goal we used the combination of two promising tools for environmental and ecosystem studies: TOM biomarkers yielded by mild cupric oxide (CuO) oxidation and GIS. TOM biomarkers, usually referred to as lignin-derived phenols biomarkers, have successfully been used to identify the abundance, source and relative state of degradation of terrestrially derived OM. In particular, lignin-derived phenols have been used in soils ( Otto and Simpson, 2006; Nierop and Filley, 2007 ), water columns and sediments ( Houel et al., 2006; Dalzell et al., 2007; Caron et al., 2008 ) to trace back and describe land-derived OM. In recent studies, lignin biomarkers have proven to be powerful tools to understand OM fluxes and fates at the watershed scale ( Farella et al., 2001; Dalzell et al., 2005; Houel et al., 2006; Caron et al., 2008; Ouellet et al., 2009 ). Furthermore, there is strong evidence in recent literature that the lignin composition is also controlled by hydrologic and soils processes in watersheds ( Dalzell et al., 2005; Houel et al., 2006; Duan et al., 2007; Hernes et al., 2007 ). Within the daunting task that is the characterization of a given drainage basin, the analysis of lignin biomarkers in sediments is an advantageous tool for predicting basin scale processes ( Houel et al., 2006 ). GIS is a powerful tool for mapping and analyzing geo-reference data. It permits spatial linking of different types of data such as elevation, slope, vegetation and land-use of a defined area (...

ACS Style

Roman Teisserenc; Marc Lucotte; Stéphane Houel; Jean Carreau. Integrated transfers of terrigenous organic matter to lakes at their watershed level: A combined biomarker and GIS analysis. Geochimica et Cosmochimica Acta 2010, 74, 6375 -6386.

AMA Style

Roman Teisserenc, Marc Lucotte, Stéphane Houel, Jean Carreau. Integrated transfers of terrigenous organic matter to lakes at their watershed level: A combined biomarker and GIS analysis. Geochimica et Cosmochimica Acta. 2010; 74 (22):6375-6386.

Chicago/Turabian Style

Roman Teisserenc; Marc Lucotte; Stéphane Houel; Jean Carreau. 2010. "Integrated transfers of terrigenous organic matter to lakes at their watershed level: A combined biomarker and GIS analysis." Geochimica et Cosmochimica Acta 74, no. 22: 6375-6386.

Journal article
Published: 13 May 2010 in Biogeochemistry
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Terrestrial organic matter (TOM) plays a key role in mercury (Hg) dynamics between watersheds and lakes. In this study we attempts to determine the role of TOM source and quality and not only quantity, in the fate and transport of total Hg (T-Hg) to boreal lakes. Integrating the watershed complexity is a daunting task. Within the scope of this project, we characterized this organic matter at a molecular level in order to determine Hg transfer conditions to the sediments. We sampled ten lakes in the Quebec boreal forest. In each lake, we took a sediment core at the deepest point in addition to analyzing T-Hg and a set of terrigenous biomarkers in recent sediments. Our results show no relationship between TOM quantity and T-Hg concentration in lake sediments. However, [T-Hg] variation is well explained by the increase of 3,5Bd/V ratios (R2 = 0.84; p < 0.0002) and the decrease of C/V ratios (R2 = 0.5; p < 0.0227). Our study shows that TOM source and quality are determinant for Hg loadings in lake sediments. More precisely, increasing TOM derived from humified soil horizons explains most of Hg level variation within sediments.

ACS Style

Roman Teisserenc; Marc Lucotte; Stephane Houel. Terrestrial organic matter biomarkers as tracers of Hg sources in lake sediments. Biogeochemistry 2010, 103, 235 -244.

AMA Style

Roman Teisserenc, Marc Lucotte, Stephane Houel. Terrestrial organic matter biomarkers as tracers of Hg sources in lake sediments. Biogeochemistry. 2010; 103 (1):235-244.

Chicago/Turabian Style

Roman Teisserenc; Marc Lucotte; Stephane Houel. 2010. "Terrestrial organic matter biomarkers as tracers of Hg sources in lake sediments." Biogeochemistry 103, no. 1: 235-244.

Journal article
Published: 06 May 2009 in Biogeochemistry
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This study presents the role of specific terrigenous organic compounds as important vectors of mercury (Hg) transported from watersheds to lakes of the Canadian boreal forest. In order to differentiate the autochthonous from the allochthonous organic matter (OM), lignin derived biomarker signatures [Lambda, S/V, C/V, P/(V + S), 3,5-Bd/V and (Ad/Al)v] were used. Since lignin is exclusively produced by terrigenous plants, this approach can give a non equivocal picture of the watershed inputs to the lakes. Moreover, it allows a characterization of the source of OM and its state of degradation. The water column of six lakes from the Canadian Shield was sampled monthly between June and September 2005. Lake total dissolved Hg concentrations and Lambda were positively correlated, meaning that Hg and ligneous inputs are linked (dissolved OM r 2 = 0.62, p < 0.0001; particulate OM r 2 = 0.76, p < 0.0001). Ratios of P/(V + S) and 3,5-Bd/V from both dissolved OM and particulate OM of the water column suggest an inverse relationship between the progressive state of pedogenesis and maturation of the OM in soil before entering the lake, and the Hg concentrations in the water column. No relation was found between Hg levels in the lakes and the watershed flora composition—angiosperm versus gymnosperm or woody versus non-woody compounds. This study has significant implications for watershed management of ecosystems since limiting fresh terrestrial OM inputs should reduce Hg inputs to the aquatic systems. This is particularly the case for large-scale land-use impacts, such as deforestation, agriculture and urbanization, associated to large quantities of soil OM being transferred to aquatic systems.

ACS Style

Jean-François Ouellet; Marc Lucotte; Roman Teisserenc; Serge Paquet; René Canuel. Lignin biomarkers as tracers of mercury sources in lakes water column. Biogeochemistry 2009, 94, 123 -140.

AMA Style

Jean-François Ouellet, Marc Lucotte, Roman Teisserenc, Serge Paquet, René Canuel. Lignin biomarkers as tracers of mercury sources in lakes water column. Biogeochemistry. 2009; 94 (2):123-140.

Chicago/Turabian Style

Jean-François Ouellet; Marc Lucotte; Roman Teisserenc; Serge Paquet; René Canuel. 2009. "Lignin biomarkers as tracers of mercury sources in lakes water column." Biogeochemistry 94, no. 2: 123-140.

Journal article
Published: 01 November 2008 in Canadian Journal of Soil Science
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Lake St. Pierre, an important freshwater location for sports and commercial fisheries in Canada, is composed of a 120 km2 stretch of the St. Lawrence River, located at the center of the St. Lawrence Lowlands. Receiving its waters from the St. François, Yamaska, Ottawa, and St. Lawrence Rivers, it is subjected to important inputs of mercury (Hg) and suspended particles eroded from its watershed. This study aims at tracing back the origin of terrigenous Hg loadings to Lake St. Pierre. The specific phenol signatures yielded by a mild oxidation of the terrestrial organic matter (TOM) carried in the water column was used as a tracer to identify the different sources of terrigenous Hg to the lake. Our results demonstrate that most of the Hg bound to suspended particulate matter (SPM-bound Hg) found in Lake St. Pierre is associated with TOM. We were also able to distinguish the relative influence that forested soils, mainly drained by the Ottawa River, and agrarian soils, located on nearby watersheds, exert on the lake's Hg burden. Our data strongly suggest that the erosion of vast areas of agrarian soils, drained by the Yamaska and St. François rivers to Lake St. Pierre, greatly facilitates the transfer of Hg from the watersheds to the lake. This study stresses the need to improve the management of agrarian soils and protect them from extensive erosion in order to preserve the integrity of the fish resources harvested in Lake St. Pierre. Key words: Mercury, soil erosion, Lake St. Pierre, lignin biomarkers

ACS Style

S. Caron; M. Lucotte; Roman Teisserenc. Mercury transfer from watersheds to aquatic environments following the erosion of agrarian soils: A molecular biomarker approach. Canadian Journal of Soil Science 2008, 88, 801 -811.

AMA Style

S. Caron, M. Lucotte, Roman Teisserenc. Mercury transfer from watersheds to aquatic environments following the erosion of agrarian soils: A molecular biomarker approach. Canadian Journal of Soil Science. 2008; 88 (5):801-811.

Chicago/Turabian Style

S. Caron; M. Lucotte; Roman Teisserenc. 2008. "Mercury transfer from watersheds to aquatic environments following the erosion of agrarian soils: A molecular biomarker approach." Canadian Journal of Soil Science 88, no. 5: 801-811.