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Gonçalo Rodrigues
Institute of Earth Sciences—ICT, Pole of the University of Évora, Rua Romão Ramalho 59, 7000-671 Évora, Portugal

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Journal article
Published: 22 April 2021 in Atmosphere
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The Alqueva reservoir, in the Southeast of Portugal, has significantly changed the landscape of the region, with impacts also on the local climate, as documented in this manuscript, namely the thermal circulation in the form of lake and land breezes. Taking advantage of three strategic meteorological stations, two installed at the shores and another on a floating platform located near the center of the reservoir, a detailed analysis of lake and land breeze occurrences during two years is presented in this study. The thermal gradient between the reservoir and the surroundings is the main driver for the breeze development and the meteorological stations placed in opposite sides of the reservoir allow to establish the criteria in order to detect lake and land breezes. The results showed more land breeze than lake breeze occurrences, in line with the more negative thermal gradient between shores and reservoir in the annual cycle. Lake breezes are more frequent in summer months during daytime and land breezes in turn are more frequent in winter months during night-time.

ACS Style

Carolina Purificação; Miguel Potes; Gonçalo Rodrigues; Rui Salgado; Maria Costa. Lake and Land Breezes at a Mediterranean Artificial Lake: Observations in Alqueva Reservoir, Portugal. Atmosphere 2021, 12, 535 .

AMA Style

Carolina Purificação, Miguel Potes, Gonçalo Rodrigues, Rui Salgado, Maria Costa. Lake and Land Breezes at a Mediterranean Artificial Lake: Observations in Alqueva Reservoir, Portugal. Atmosphere. 2021; 12 (5):535.

Chicago/Turabian Style

Carolina Purificação; Miguel Potes; Gonçalo Rodrigues; Rui Salgado; Maria Costa. 2021. "Lake and Land Breezes at a Mediterranean Artificial Lake: Observations in Alqueva Reservoir, Portugal." Atmosphere 12, no. 5: 535.

Journal article
Published: 05 March 2021 in Water
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Nowadays, the Mediterranean freshwater systems face the threat of water scarcity, along with multiple other stressors (e.g., organic and inorganic contamination, geomorphological alterations, invasive species), leading to the impairment of their ecosystem services. All these stressors have been speeding up, due to climate variability and land cover/land use changes, turning them into a big challenge for the water management plans. The present study analyses the physicochemical and phytoplankton biomass (chlorophyll-a) dynamics of a large reservoir, in the Mediterranean region (Alqueva reservoir, Southern Portugal), under diverse meteorological conditions and land cover/land use real scenarios (2017 and 2018). The most important stressors were identified and the necessary tools and information for a more effective management plan were provided. Changes in these parameters were further related to the observed variations in the meteorological conditions and in the land cover/land use. The increase in nutrients and ions in the water column, and of potentially toxic metals in the sediment, were more obvious in periods of severe drought. Further, the enhancement of nutrients concentrations, potentially caused by the intensification of agricultural activities, may indicate an increased risk of water eutrophication. The results highlight that a holistic approach is essential for a better water resources management strategy.

ACS Style

Patrícia Palma; Alexandra Penha; Maria Novais; Sofia Fialho; Ana Lima; Clarisse Mourinha; Paula Alvarenga; Anabela Rosado; Maksim Iakunin; Gonçalo Rodrigues; Miguel Potes; Maria Costa; Manuela Morais; Rui Salgado. Water-Sediment Physicochemical Dynamics in a Large Reservoir in the Mediterranean Region under Multiple Stressors. Water 2021, 13, 707 .

AMA Style

Patrícia Palma, Alexandra Penha, Maria Novais, Sofia Fialho, Ana Lima, Clarisse Mourinha, Paula Alvarenga, Anabela Rosado, Maksim Iakunin, Gonçalo Rodrigues, Miguel Potes, Maria Costa, Manuela Morais, Rui Salgado. Water-Sediment Physicochemical Dynamics in a Large Reservoir in the Mediterranean Region under Multiple Stressors. Water. 2021; 13 (5):707.

Chicago/Turabian Style

Patrícia Palma; Alexandra Penha; Maria Novais; Sofia Fialho; Ana Lima; Clarisse Mourinha; Paula Alvarenga; Anabela Rosado; Maksim Iakunin; Gonçalo Rodrigues; Miguel Potes; Maria Costa; Manuela Morais; Rui Salgado. 2021. "Water-Sediment Physicochemical Dynamics in a Large Reservoir in the Mediterranean Region under Multiple Stressors." Water 13, no. 5: 707.

Journal article
Published: 28 February 2020 in Remote Sensing
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The Alqueva reservoir (South of Portugal) in the Guadiana river basin constitutes the most important water resource in southern Portugal for domestic and agricultural consumption. We present a methodology developed to characterize spatial and temporal variations of Secchi depth and diffuse attenuation coefficient (both related to dissolved/suspended particles and to water transparency), using high spatial resolution satellite images from Sentinel-2 Multi-Spectral Instrument (MSI). Empirical relations between satellite retrievals of surface reflectances and in situ measurements of water parameters were defined and applied to the entire reservoir for spatial and temporal analysis in the period July 2017–June 2019, useful in the identification of microalgae blooms and rapid variations in water characteristics, which allowed us to differentiate five zones. Water estimates with lower transparency and higher attenuation of radiation were found in the northern area of Alqueva reservoir during the months characterized by higher water temperatures, with Secchi depth monthly averages near 1.0 m and diffuse attenuation coefficient near or above 1.5 m-1. Satellite retrievals of water with greater transparency in the reservoir were obtained in the southern area in months with low water temperature and atmospheric stability, presenting some monthly Secchi depth averages above 3 m, and diffuse attenuation coefficient below 0.8 m-1. January 2018 presented great transparency of water with a Secchi depth of 7.5 m for pixels representing the 95th percentile and diffuse attenuation coefficient of 0.36 m for pixels representing the 5th percentile in the Southern region.

ACS Style

Gonçalo Rodrigues; Miguel Potes; Maria João Costa; Maria Helena Novais; Alexandra Marchã Penha; Rui Salgado; Maria Manuela Morais. Temporal and Spatial Variations of Secchi Depth and Diffuse Attenuation Coefficient from Sentinel-2 MSI over a Large Reservoir. Remote Sensing 2020, 12, 768 .

AMA Style

Gonçalo Rodrigues, Miguel Potes, Maria João Costa, Maria Helena Novais, Alexandra Marchã Penha, Rui Salgado, Maria Manuela Morais. Temporal and Spatial Variations of Secchi Depth and Diffuse Attenuation Coefficient from Sentinel-2 MSI over a Large Reservoir. Remote Sensing. 2020; 12 (5):768.

Chicago/Turabian Style

Gonçalo Rodrigues; Miguel Potes; Maria João Costa; Maria Helena Novais; Alexandra Marchã Penha; Rui Salgado; Maria Manuela Morais. 2020. "Temporal and Spatial Variations of Secchi Depth and Diffuse Attenuation Coefficient from Sentinel-2 MSI over a Large Reservoir." Remote Sensing 12, no. 5: 768.

Journal article
Published: 11 July 2019 in Remote Sensing
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This study presents a validation of aerosol optical thickness (AOT) and integrated water vapour (IWV) products provided by the European Space Agency (ESA) from multi-spectral imager (MSI) measurements on board the Sentinel-2 satellite (ESA-L2A). For that purpose, data from 94 Aerosol Robotic Network (AERONET) stations over Europe and adjacent regions, covering a wide geographical region with a variety of climate and environmental conditions and during the period between March 2017 and December 2018 have been used. The comparison between ESA-L2A and AERONET shows a better agreement for IWV than the AOT, with normalized root mean square errors (NRMSE) of 5.33% and 9.04%, respectively. This conclusion is also reflected in the values of R2, which are 0.99 and 0.65 for IWV and AOT, respectively. The study period was divided into two sub-periods, before and after 15 January 2018, when the Sentinel-2A spectral response functions of bands 1 and 2 (centered at 443 and 492 nm) were updated by ESA, in order to investigate if the lack of agreement in the AOT values was connected to the use of incorrect spectral response functions. The comparison of ESA-L2A AOT with AERONET measurements showed a better agreement for the second sub-period, with root mean square error (RMSE) values of 0.08 in comparison with 0.14 in the first sub-period. This same conclusion was attained considering mean bias error (MBE) values that decreased from 0.09 to 0.01. The ESA-L2A AOT values estimated with the new spectral response functions were closer to the correspondent reference AERONET values than the ones obtained using the previous spectral response functions. IWV was not affected by this change since the retrieval algorithm does not use bands 1 and 2 of Sentinel-2. Additionally, an analysis of potential uncertainty sources to several factors affecting the AOT comparison is presented and recommendations regarding the use of ESA-L2A AOT dataset are given.

ACS Style

María Ángeles Obregón; Gonçalo Rodrigues; Maria Joao Costa; Miguel Potes; Ana Maria Silva. Validation of ESA Sentinel-2 L2A Aerosol Optical Thickness and Columnar Water Vapour during 2017–2018. Remote Sensing 2019, 11, 1649 .

AMA Style

María Ángeles Obregón, Gonçalo Rodrigues, Maria Joao Costa, Miguel Potes, Ana Maria Silva. Validation of ESA Sentinel-2 L2A Aerosol Optical Thickness and Columnar Water Vapour during 2017–2018. Remote Sensing. 2019; 11 (14):1649.

Chicago/Turabian Style

María Ángeles Obregón; Gonçalo Rodrigues; Maria Joao Costa; Miguel Potes; Ana Maria Silva. 2019. "Validation of ESA Sentinel-2 L2A Aerosol Optical Thickness and Columnar Water Vapour during 2017–2018." Remote Sensing 11, no. 14: 1649.