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While the impacts of climate change on wildfires and resulting air pollution levels have been observed, little is known about how indoor air filtering systems are performing under intensive smoke conditions. For this aim, particle number size distribution and concentration in a size range 0.5–18 µm and equivalent black carbon (eBC) mass concentration were measured in a modern office with a mechanical ventilation system. Measurements took place from 30 September to 6 October 2020 in the Center for Physical Sciences and Technology (FTMC) campus located in the urban background environment in Lithuania. During the measurement campaign, an intensive pollution episode, related to long-range transport wildfire smoke, was observed. The results indicated that the smoke event increased both indoor and outdoor eBC mass concentrations twice. Filters were non-selective for different eBC sources (biomass burning versus traffic) or chemical composition of carbonaceous aerosol particles (eBC versus brown carbon (BrC)). Air filtering efficiency was found to be highly dependent on particle size. During the smoke event the highest particle number concentration was observed at 2.1 µm and 1.0 µm size particles in outdoor and indoor air, respectively. Differences of indoor to outdoor ratio between event and non-event days were not significant. Because of lower removal rate for small particles, eBC had higher contribution to total PM2.5 mass concentration in indoor air than in outdoor air. The results gained are crucial for decision-making bodies in order to implement higher-quality air-filtering systems in office buildings and, as a result, minimize potential health impacts.
Julija Pauraite; Gediminas Mainelis; Simonas Kecorius; Agnė Minderytė; Vadimas Dudoitis; Inga Garbarienė; Kristina Plauškaitė; Jurgita Ovadnevaite; Steigvilė Byčenkienė. Office Indoor PM and BC Level in Lithuania: The Role of a Long-Range Smoke Transport Event. Atmosphere 2021, 12, 1047 .
AMA StyleJulija Pauraite, Gediminas Mainelis, Simonas Kecorius, Agnė Minderytė, Vadimas Dudoitis, Inga Garbarienė, Kristina Plauškaitė, Jurgita Ovadnevaite, Steigvilė Byčenkienė. Office Indoor PM and BC Level in Lithuania: The Role of a Long-Range Smoke Transport Event. Atmosphere. 2021; 12 (8):1047.
Chicago/Turabian StyleJulija Pauraite; Gediminas Mainelis; Simonas Kecorius; Agnė Minderytė; Vadimas Dudoitis; Inga Garbarienė; Kristina Plauškaitė; Jurgita Ovadnevaite; Steigvilė Byčenkienė. 2021. "Office Indoor PM and BC Level in Lithuania: The Role of a Long-Range Smoke Transport Event." Atmosphere 12, no. 8: 1047.
Air pollution, which kills an estimated 7 million people every year, is one of the greatest environmental health risks of our times. Finding solutions to this threat poses challenges to practitioners and policymakers alike. Increasing awareness on the benefits of transdisciplinary research in solution-oriented sustainable development projects has led to the establishment of the research project “A Transdisciplinary Approach to Mitigate Emissions of Black Carbon” (TAME-BC). This paper introduces the TAME-BC research setup that took place with Metro Manila, Philippines, case study. The approach integrates BC measurements with technological, socio-political, and health aspects to improve the scientific state of the art, policymaking, transport sector planning, and clinical studies related to air pollution health effects. The first pillar in the setup presents an (1) air quality assessment through aerosol measurements and instrumentation, complemented by a (2) description and assessment of the current policies, technologies, and practices of the transport sector that is responsible for pollution levels in the Philippines, as well as a (3) BC exposure and associated health impacts assessment. The fourth pillar is intercrossing, fostering (4) knowledge co-creation through stakeholder involvement across scales. We argue that this transdisciplinary approach is useful for research endeavors aiming for emission mitigation in rapidly urbanizing regions beyond Metro Manila.
Liina Tõnisson; Yvonne Kunz; Simonas Kecorius; Leizel Madueño; Everlyn Tamayo; Dang Casanova; Qi Zhao; Tamara Schikowski; Anna-Katharina Hornidge; Alfred Wiedensohler; Andreas Macke. From Transfer to Knowledge Co-Production: A Transdisciplinary Research Approach to Reduce Black Carbon Emissions in Metro Manila, Philippines. Sustainability 2020, 12, 10043 .
AMA StyleLiina Tõnisson, Yvonne Kunz, Simonas Kecorius, Leizel Madueño, Everlyn Tamayo, Dang Casanova, Qi Zhao, Tamara Schikowski, Anna-Katharina Hornidge, Alfred Wiedensohler, Andreas Macke. From Transfer to Knowledge Co-Production: A Transdisciplinary Research Approach to Reduce Black Carbon Emissions in Metro Manila, Philippines. Sustainability. 2020; 12 (23):10043.
Chicago/Turabian StyleLiina Tõnisson; Yvonne Kunz; Simonas Kecorius; Leizel Madueño; Everlyn Tamayo; Dang Casanova; Qi Zhao; Tamara Schikowski; Anna-Katharina Hornidge; Alfred Wiedensohler; Andreas Macke. 2020. "From Transfer to Knowledge Co-Production: A Transdisciplinary Research Approach to Reduce Black Carbon Emissions in Metro Manila, Philippines." Sustainability 12, no. 23: 10043.
The traffic microenvironment accounts for a significant fraction of the total daily dose of inhaled air pollutants. The adverse effects of air pollution may be intensified in high altitudes (HA) due to increased minute ventilation (MV), which may result in higher deposition doses compared to that at sea level. Despite this, air quality studies in regions with combined high pollution levels and enhanced inhalation are limited. The main goals of this study are to investigate how the choice of travel mode (walking, microbus, and cable car ride) determines (i) the personal exposure to equivalent black carbon (eBC) and (ii) the corresponding potential respiratory deposited dose (RDD) in HA. For this investigation, we chose La Paz and El Alto in Bolivia as HA representative cities. The highest eBC exposure occurred in microbus commutes (13 μg m−3), while the highest RDD per trip was recorded while walking (6.3 μg) due to increased MV. On the other hand, the lowest eBC exposure and RDD were observed in cable car commute. Compared with similar studies done at sea level, our results revealed that a HA city should reduce exposure by 1.4 to 1.8-fold to achieve similar RDD at sea level, implying that HA cities require doubly aggressive and stringent road emission policies compared to those at sea level.
Leizel Madueño; Simonas Kecorius; Marcos Andrade; Alfred Wiedensohler. Exposure and Respiratory Tract Deposition Dose of Equivalent Black Carbon in High Altitudes. Atmosphere 2020, 11, 598 .
AMA StyleLeizel Madueño, Simonas Kecorius, Marcos Andrade, Alfred Wiedensohler. Exposure and Respiratory Tract Deposition Dose of Equivalent Black Carbon in High Altitudes. Atmosphere. 2020; 11 (6):598.
Chicago/Turabian StyleLeizel Madueño; Simonas Kecorius; Marcos Andrade; Alfred Wiedensohler. 2020. "Exposure and Respiratory Tract Deposition Dose of Equivalent Black Carbon in High Altitudes." Atmosphere 11, no. 6: 598.
In a warming Arctic the increased occurrence of new particle formation (NPF) is believed to originate from the declining ice coverage during summertime. Understanding the physico-chemical properties of newly formed particles, as well as mechanisms that control both particle formation and growth in this pristine environment, is important for interpreting aerosol–cloud interactions, to which the Arctic climate can be highly sensitive. In this investigation, we present the analysis of NPF and growth in the high summer Arctic. The measurements were made on-board research vessel Polarstern during the PS106 Arctic expedition. Four distinctive NPF and subsequent particle growth events were observed, during which particle (diameter in a range 10–50 nm) number concentrations increased from background values of approx. 40 up to 4000 cm−3. Based on particle formation and growth rates, as well as hygroscopicity of nucleation and the Aitken mode particles, we distinguished two different types of NPF events. First, some NPF events were favored by negative ions, resulting in more-hygroscopic nucleation mode particles and suggesting sulfuric acid as a precursor gas. Second, other NPF events resulted in less-hygroscopic particles, indicating the influence of organic vapors on particle formation and growth. To test the climatic relevance of NPF and its influence on the cloud condensation nuclei (CCN) budget in the Arctic, we applied a zero-dimensional, adiabatic cloud parcel model. At an updraft velocity of 0.1 m s−1, the particle number size distribution (PNSD) generated during nucleation processes resulted in an increase in the CCN number concentration by a factor of 2 to 5 compared to the background CCN concentrations. This result was confirmed by the directly measured CCN number concentrations. Although particles did not grow beyond 50 nm in diameter and the activated fraction of 15–50 nm particles was on average below 10 %, it could be shown that the sheer number of particles produced by the nucleation process is enough to significantly influence the background CCN number concentration. This implies that NPF can be an important source of CCN in the Arctic. However, more studies should be conducted in the future to understand mechanisms of NPF, sources of precursor gases and condensable vapors, as well as the role of the aged nucleation mode particles in Arctic cloud formation.
Simonas Kecorius; Teresa Vogl; Pauli Paasonen; Janne Lampilahti; Daniel Rothenberg; Heike Wex; Sebastian Zeppenfeld; Manuela van Pinxteren; Markus Hartmann; Silvia Henning; Xianda Gong; Andre Welti; Markku Kulmala; Frank Stratmann; Hartmut Herrmann; Alfred Wiedensohler. New particle formation and its effect on cloud condensation nuclei abundance in the summer Arctic: a case study in the Fram Strait and Barents Sea. Atmospheric Chemistry and Physics 2019, 19, 14339 -14364.
AMA StyleSimonas Kecorius, Teresa Vogl, Pauli Paasonen, Janne Lampilahti, Daniel Rothenberg, Heike Wex, Sebastian Zeppenfeld, Manuela van Pinxteren, Markus Hartmann, Silvia Henning, Xianda Gong, Andre Welti, Markku Kulmala, Frank Stratmann, Hartmut Herrmann, Alfred Wiedensohler. New particle formation and its effect on cloud condensation nuclei abundance in the summer Arctic: a case study in the Fram Strait and Barents Sea. Atmospheric Chemistry and Physics. 2019; 19 (22):14339-14364.
Chicago/Turabian StyleSimonas Kecorius; Teresa Vogl; Pauli Paasonen; Janne Lampilahti; Daniel Rothenberg; Heike Wex; Sebastian Zeppenfeld; Manuela van Pinxteren; Markus Hartmann; Silvia Henning; Xianda Gong; Andre Welti; Markku Kulmala; Frank Stratmann; Hartmut Herrmann; Alfred Wiedensohler. 2019. "New particle formation and its effect on cloud condensation nuclei abundance in the summer Arctic: a case study in the Fram Strait and Barents Sea." Atmospheric Chemistry and Physics 19, no. 22: 14339-14364.
Poor air quality has been identified as one of the main risks to human health, especially in developing regions, where the information on physical chemical properties of air pollutants is lacking. To bridge this gap, we conducted an intensive measurement campaign in Manila, Philippines to determine the emission factors (EFs) of particle number (PN) and equivalent black carbon (BC). The focus was on public utility jeepneys (PUJ), equipped with old technology diesel engines, widely used for public transportation. The EFs were determined by aerosol physical measurements, fleet information, and modeled dilution using the Operational Street Pollution Model (OSPM). The results show that average vehicle EFs of PN and BC in Manila is up to two orders of magnitude higher than European emission standards. Furthermore, a PUJ emits up to seven times more than a light-duty vehicles (LDVs) and contribute to more than 60% of BC emission in Manila. Unfortunately, traffic restrictions for heavy-duty vehicles do not apply to PUJs. The results presented in this work provide a framework to help support targeted traffic interventions to improve urban air quality not only in Manila, but also in other countries with a similar fleet composed of old-technology vehicles.
Leizel Madueño; Simonas Kecorius; Wolfram Birmili; Thomas Müller; James Simpas; Edgar Vallar; Maria Cecilia Galvez; Mylene Cayetano; Alfred Wiedensohler. Aerosol Particle and Black Carbon Emission Factors of Vehicular Fleet in Manila, Philippines. Atmosphere 2019, 10, 603 .
AMA StyleLeizel Madueño, Simonas Kecorius, Wolfram Birmili, Thomas Müller, James Simpas, Edgar Vallar, Maria Cecilia Galvez, Mylene Cayetano, Alfred Wiedensohler. Aerosol Particle and Black Carbon Emission Factors of Vehicular Fleet in Manila, Philippines. Atmosphere. 2019; 10 (10):603.
Chicago/Turabian StyleLeizel Madueño; Simonas Kecorius; Wolfram Birmili; Thomas Müller; James Simpas; Edgar Vallar; Maria Cecilia Galvez; Mylene Cayetano; Alfred Wiedensohler. 2019. "Aerosol Particle and Black Carbon Emission Factors of Vehicular Fleet in Manila, Philippines." Atmosphere 10, no. 10: 603.
Clouds play an important role in Arctic amplification. This term represents the recently observed enhanced warming of the Arctic relative to the global increase of near-surface air temperature. However, there are still important knowledge gaps regarding the interplay between Arctic clouds and aerosol particles, and surface properties, as well as turbulent and radiative fluxes that inhibit accurate model simulations of clouds in the Arctic climate system. In an attempt to resolve this so-called Arctic cloud puzzle, two comprehensive and closely coordinated field studies were conducted: the Arctic Cloud Observations Using Airborne Measurements during Polar Day (ACLOUD) aircraft campaign and the Physical Feedbacks of Arctic Boundary Layer, Sea Ice, Cloud and Aerosol (PASCAL) ice breaker expedition. Both observational studies were performed in the framework of the German Arctic Amplification: Climate Relevant Atmospheric and Surface Processes, and Feedback Mechanisms (AC)3 project. They took place in the vicinity of Svalbard, Norway, in May and June 2017. ACLOUD and PASCAL explored four pieces of the Arctic cloud puzzle: cloud properties, aerosol impact on clouds, atmospheric radiation, and turbulent dynamical processes. The two instrumented Polar 5 and Polar 6 aircraft; the icebreaker Research Vessel (R/V) Polarstern; an ice floe camp including an instrumented tethered balloon; and the permanent ground-based measurement station at Ny-Ålesund, Svalbard, were employed to observe Arctic low- and mid-level mixed-phase clouds and to investigate related atmospheric and surface processes. The Polar 5 aircraft served as a remote sensing observatory examining the clouds from above by downward-looking sensors; the Polar 6 aircraft operated as a flying in situ measurement laboratory sampling inside and below the clouds. Most of the collocated Polar 5/6 flights were conducted either above the R/V Polarstern or over the Ny-Ålesund station, both of which monitored the clouds from below using similar but upward-looking remote sensing techniques as the Polar 5 aircraft. Several of the flights were carried out underneath collocated satellite tracks. The paper motivates the scientific objectives of the ACLOUD/PASCAL observations and describes the measured quantities, retrieved parameters, and the applied complementary instrumentation. Furthermore, it discusses selected measurement results and poses critical research questions to be answered in future papers analyzing the data from the two field campaigns.
Manfred Wendisch; Andreas Macke; André Ehrlich; Christof Lüpkes; Mario Mech; Dmitry Chechin; Klaus Dethloff; Carola Barrientos Velasco; Heiko Bozem; Marlen Brückner; Hans-Christian Clemen; Susanne Crewell; Tobias Donth; Regis Dupuy; Kerstin Ebell; Ulrike Egerer; Ronny Engelmann; Christa Engler; Oliver Eppers; Martin Gehrmann; Xianda Gong; Matthias Gottschalk; Christophe Gourbeyre; Hannes Griesche; Jörg Hartmann; Markus Hartmann; Bernd Heinold; Andreas Herber; Hartmut Herrmann; Georg Heygster; Peter Hoor; Soheila Jafariserajehlou; Evelyn Jäkel; Emma Järvinen; Olivier Jourdan; Udo Kästner; Simonas Kecorius; Erlend Moster Knudsen; Franziska Köllner; Jan Kretzschmar; Luca Lelli; Delphine Leroy; Marion Maturilli; Linlu Mei; Stephan Mertes; Guillaume Mioche; Roland Neuber; Marcel Nicolaus; Tatiana Nomokonova; Justus Notholt; Mathias Palm; Manuela Van Pinxteren; Johannes Quaas; Philipp Richter; Elena Ruiz-Donoso; Michael Schäfer; Katja Schmieder; Martin Schnaiter; Johannes Schneider; Alfons Schwarzenböck; Patric Seifert; Matthew D. Shupe; Holger Siebert; Gunnar Spreen; Johannes Stapf; Frank Stratmann; Teresa Vogl; André Welti; Heike Wex; Alfred Wiedensohler; Marco Zanatta; Sebastian Zeppenfeld. The Arctic Cloud Puzzle: Using ACLOUD/PASCAL Multiplatform Observations to Unravel the Role of Clouds and Aerosol Particles in Arctic Amplification. Bulletin of the American Meteorological Society 2019, 100, 841 -871.
AMA StyleManfred Wendisch, Andreas Macke, André Ehrlich, Christof Lüpkes, Mario Mech, Dmitry Chechin, Klaus Dethloff, Carola Barrientos Velasco, Heiko Bozem, Marlen Brückner, Hans-Christian Clemen, Susanne Crewell, Tobias Donth, Regis Dupuy, Kerstin Ebell, Ulrike Egerer, Ronny Engelmann, Christa Engler, Oliver Eppers, Martin Gehrmann, Xianda Gong, Matthias Gottschalk, Christophe Gourbeyre, Hannes Griesche, Jörg Hartmann, Markus Hartmann, Bernd Heinold, Andreas Herber, Hartmut Herrmann, Georg Heygster, Peter Hoor, Soheila Jafariserajehlou, Evelyn Jäkel, Emma Järvinen, Olivier Jourdan, Udo Kästner, Simonas Kecorius, Erlend Moster Knudsen, Franziska Köllner, Jan Kretzschmar, Luca Lelli, Delphine Leroy, Marion Maturilli, Linlu Mei, Stephan Mertes, Guillaume Mioche, Roland Neuber, Marcel Nicolaus, Tatiana Nomokonova, Justus Notholt, Mathias Palm, Manuela Van Pinxteren, Johannes Quaas, Philipp Richter, Elena Ruiz-Donoso, Michael Schäfer, Katja Schmieder, Martin Schnaiter, Johannes Schneider, Alfons Schwarzenböck, Patric Seifert, Matthew D. Shupe, Holger Siebert, Gunnar Spreen, Johannes Stapf, Frank Stratmann, Teresa Vogl, André Welti, Heike Wex, Alfred Wiedensohler, Marco Zanatta, Sebastian Zeppenfeld. The Arctic Cloud Puzzle: Using ACLOUD/PASCAL Multiplatform Observations to Unravel the Role of Clouds and Aerosol Particles in Arctic Amplification. Bulletin of the American Meteorological Society. 2019; 100 (5):841-871.
Chicago/Turabian StyleManfred Wendisch; Andreas Macke; André Ehrlich; Christof Lüpkes; Mario Mech; Dmitry Chechin; Klaus Dethloff; Carola Barrientos Velasco; Heiko Bozem; Marlen Brückner; Hans-Christian Clemen; Susanne Crewell; Tobias Donth; Regis Dupuy; Kerstin Ebell; Ulrike Egerer; Ronny Engelmann; Christa Engler; Oliver Eppers; Martin Gehrmann; Xianda Gong; Matthias Gottschalk; Christophe Gourbeyre; Hannes Griesche; Jörg Hartmann; Markus Hartmann; Bernd Heinold; Andreas Herber; Hartmut Herrmann; Georg Heygster; Peter Hoor; Soheila Jafariserajehlou; Evelyn Jäkel; Emma Järvinen; Olivier Jourdan; Udo Kästner; Simonas Kecorius; Erlend Moster Knudsen; Franziska Köllner; Jan Kretzschmar; Luca Lelli; Delphine Leroy; Marion Maturilli; Linlu Mei; Stephan Mertes; Guillaume Mioche; Roland Neuber; Marcel Nicolaus; Tatiana Nomokonova; Justus Notholt; Mathias Palm; Manuela Van Pinxteren; Johannes Quaas; Philipp Richter; Elena Ruiz-Donoso; Michael Schäfer; Katja Schmieder; Martin Schnaiter; Johannes Schneider; Alfons Schwarzenböck; Patric Seifert; Matthew D. Shupe; Holger Siebert; Gunnar Spreen; Johannes Stapf; Frank Stratmann; Teresa Vogl; André Welti; Heike Wex; Alfred Wiedensohler; Marco Zanatta; Sebastian Zeppenfeld. 2019. "The Arctic Cloud Puzzle: Using ACLOUD/PASCAL Multiplatform Observations to Unravel the Role of Clouds and Aerosol Particles in Arctic Amplification." Bulletin of the American Meteorological Society 100, no. 5: 841-871.
In this study, we present the development of a mobile system to measure real-world total respiratory tract deposition of inhaled ambient black carbon (BC). Such information can be used to supplement the existing knowledge on air pollution-related health effects, especially in the regions, where the use of standard methods and intricate instrumentation is limited. The study is divided in two parts. Firstly, we present the design of portable system and methodology to evaluate the exhaled air BC content. We demonstrate that under real-world conditions, the proposed system exhibit negligible particle losses, and can additionally be used to determine the minute ventilation. Secondly, exemplary experimental data from the system is presented. A feasibility study was conducted in the city of La Paz, Bolivia. In a pilot experiment, we found that the cumulative total respiratory tract deposition dose over 1-h commuting trip would result in approximately 2.6 μg of BC. This is up to 5 times lower than the values obtained from conjectural approach (e.g. using physical parameters from previously reported worksheets). Measured total respiratory tract deposited BC fraction varied from 39% to 48% during walking and commuting inside a micro-bus, respectively. To the best of our knowledge, no studies, focusing on experimental determination of real-world deposition dose of BC, have been performed in developing regions. This can be especially important, because the BC mass concentration is significant and determines a large fraction of particle mass concentration. In this work, we propose a potential method, recommendations, as well as the limitations in establishing an easy and relatively cheap way to estimate the respiratory tract deposition of BC.
Leizel Madueño; Simonas Kecorius; Jakob Löndahl; Thomas Müller; Sascha Pfeifer; Andrea Haudek; Valeria Mardoñez; Alfred Wiedensohler. A new method to measure real-world respiratory tract deposition of inhaled ambient black carbon. Environmental Pollution 2019, 248, 295 -303.
AMA StyleLeizel Madueño, Simonas Kecorius, Jakob Löndahl, Thomas Müller, Sascha Pfeifer, Andrea Haudek, Valeria Mardoñez, Alfred Wiedensohler. A new method to measure real-world respiratory tract deposition of inhaled ambient black carbon. Environmental Pollution. 2019; 248 ():295-303.
Chicago/Turabian StyleLeizel Madueño; Simonas Kecorius; Jakob Löndahl; Thomas Müller; Sascha Pfeifer; Andrea Haudek; Valeria Mardoñez; Alfred Wiedensohler. 2019. "A new method to measure real-world respiratory tract deposition of inhaled ambient black carbon." Environmental Pollution 248, no. : 295-303.
Recent studies demonstrate that Black Carbon (BC) pollution in economically developing megacities remain higher than the values, which the World Health Organization considers to be safe. Despite the scientific evidence of the degrees of BC exposure, there is still a lack of understanding on how the severe levels of BC pollution affect human health in these regions. We consider information on the respiratory tract deposition dose (DD) of BC to be essential in understanding the link between personal exposure to air pollutants and corresponding health effects. In this work, we combine data on fine and ultrafine refractory particle number concentrations (BC proxy), and activity patterns to derive the respiratory tract deposited amounts of BC particles for the population of the highly polluted metropolitan area of Manila, Philippines. We calculated the total DD of refractory particles based on three metrics: refractory particle number, surface area, and mass concentrations. The calculated DD of total refractory particle number in Metro Manila was found to be 1.6 to 17 times higher than average values reported from Europe and the U.S. In the case of Manila, ultrafine particles smaller than 100 nm accounted for more than 90% of the total deposited refractory particle dose in terms of particle number. This work is a first attempt to quantitatively evaluate the DD of refractory particles and raise awareness in assessing pollution-related health effects in developing megacities. We demonstrate that the majority of the population may be highly affected by BC pollution, which is known to have negative health outcomes if no actions are taken to mitigate its emission. For the governments of such metropolitan areas, we suggest to revise currently existing environmental legislation, raise public awareness, and to establish supplementary monitoring of black carbon in parallel to already existing PM10 and PM2.5 measures.
Simonas Kecorius; Leizel Madueño; Jakob Löndahl; Edgar Vallar; Maria Cecilia Galvez; Luisito F. Idolor; Mylene Gonzaga-Cayetano; Thomas Müller; Wolfram Birmili; Alfred Wiedensohler. Respiratory tract deposition of inhaled roadside ultrafine refractory particles in a polluted megacity of South-East Asia. Science of The Total Environment 2019, 663, 265 -274.
AMA StyleSimonas Kecorius, Leizel Madueño, Jakob Löndahl, Edgar Vallar, Maria Cecilia Galvez, Luisito F. Idolor, Mylene Gonzaga-Cayetano, Thomas Müller, Wolfram Birmili, Alfred Wiedensohler. Respiratory tract deposition of inhaled roadside ultrafine refractory particles in a polluted megacity of South-East Asia. Science of The Total Environment. 2019; 663 ():265-274.
Chicago/Turabian StyleSimonas Kecorius; Leizel Madueño; Jakob Löndahl; Edgar Vallar; Maria Cecilia Galvez; Luisito F. Idolor; Mylene Gonzaga-Cayetano; Thomas Müller; Wolfram Birmili; Alfred Wiedensohler. 2019. "Respiratory tract deposition of inhaled roadside ultrafine refractory particles in a polluted megacity of South-East Asia." Science of The Total Environment 663, no. : 265-274.
The international journal of Aerosol and Air Quality Research (AAQR) covers all aspects of aerosol science and technology, atmospheric science and air quality related issues.
Simonas Kecorius; Everlyn Gayle Tamayo; Maria Cecilia Galvez; Leizel Madueño; Grace Betito; Mylene Gonzaga-Cayetano; Edgar Vallar; Alfred Wiedensohler. Activity Pattern of School/University Tenants and their Family Members in Metro Manila – Philippines. Aerosol and Air Quality Research 2018, 18, 2412 -2419.
AMA StyleSimonas Kecorius, Everlyn Gayle Tamayo, Maria Cecilia Galvez, Leizel Madueño, Grace Betito, Mylene Gonzaga-Cayetano, Edgar Vallar, Alfred Wiedensohler. Activity Pattern of School/University Tenants and their Family Members in Metro Manila – Philippines. Aerosol and Air Quality Research. 2018; 18 (9):2412-2419.
Chicago/Turabian StyleSimonas Kecorius; Everlyn Gayle Tamayo; Maria Cecilia Galvez; Leizel Madueño; Grace Betito; Mylene Gonzaga-Cayetano; Edgar Vallar; Alfred Wiedensohler. 2018. "Activity Pattern of School/University Tenants and their Family Members in Metro Manila – Philippines." Aerosol and Air Quality Research 18, no. 9: 2412-2419.
Honey Dawn Alas; Thomas Müller; Wolfram Birmili; Simonas Kecorius; Maria Obiminda Cambaliza; James Bernard B. Simpas; Mylene Cayetano; Kay Weinhold; Edgar Vallar; Maria Cecilia Galvez; Alfred Wiedensohler. Spatial Characterization of Black Carbon Mass Concentration in the Atmosphere of a Southeast Asian Megacity: An Air Quality Case Study for Metro Manila, Philippines. Aerosol and Air Quality Research 2018, 18, 2301 -2317.
AMA StyleHoney Dawn Alas, Thomas Müller, Wolfram Birmili, Simonas Kecorius, Maria Obiminda Cambaliza, James Bernard B. Simpas, Mylene Cayetano, Kay Weinhold, Edgar Vallar, Maria Cecilia Galvez, Alfred Wiedensohler. Spatial Characterization of Black Carbon Mass Concentration in the Atmosphere of a Southeast Asian Megacity: An Air Quality Case Study for Metro Manila, Philippines. Aerosol and Air Quality Research. 2018; 18 (9):2301-2317.
Chicago/Turabian StyleHoney Dawn Alas; Thomas Müller; Wolfram Birmili; Simonas Kecorius; Maria Obiminda Cambaliza; James Bernard B. Simpas; Mylene Cayetano; Kay Weinhold; Edgar Vallar; Maria Cecilia Galvez; Alfred Wiedensohler. 2018. "Spatial Characterization of Black Carbon Mass Concentration in the Atmosphere of a Southeast Asian Megacity: An Air Quality Case Study for Metro Manila, Philippines." Aerosol and Air Quality Research 18, no. 9: 2301-2317.
Simonas Kecorius; Leizel Madueño; Edgar Vallar; Honey Alas; Grace Betito; Wolfram Birmili; Maria Obiminda Cambaliza; Grethyl Catipay; Mylene Gonzaga-Cayetano; Maria Cecilia Galvez; Genie Lorenzo; Thomas Müller; James B. Simpas; Everlyn Gayle Tamayo; Alfred Wiedensohler. Aerosol particle mixing state, refractory particle number size distributions and emission factors in a polluted urban environment: Case study of Metro Manila, Philippines. Atmospheric Environment 2017, 170, 169 -183.
AMA StyleSimonas Kecorius, Leizel Madueño, Edgar Vallar, Honey Alas, Grace Betito, Wolfram Birmili, Maria Obiminda Cambaliza, Grethyl Catipay, Mylene Gonzaga-Cayetano, Maria Cecilia Galvez, Genie Lorenzo, Thomas Müller, James B. Simpas, Everlyn Gayle Tamayo, Alfred Wiedensohler. Aerosol particle mixing state, refractory particle number size distributions and emission factors in a polluted urban environment: Case study of Metro Manila, Philippines. Atmospheric Environment. 2017; 170 ():169-183.
Chicago/Turabian StyleSimonas Kecorius; Leizel Madueño; Edgar Vallar; Honey Alas; Grace Betito; Wolfram Birmili; Maria Obiminda Cambaliza; Grethyl Catipay; Mylene Gonzaga-Cayetano; Maria Cecilia Galvez; Genie Lorenzo; Thomas Müller; James B. Simpas; Everlyn Gayle Tamayo; Alfred Wiedensohler. 2017. "Aerosol particle mixing state, refractory particle number size distributions and emission factors in a polluted urban environment: Case study of Metro Manila, Philippines." Atmospheric Environment 170, no. : 169-183.
Simonas Kecorius; Nan Ma; Monique Teich; Dominik Van Pinxteren; Shenglan Zhang; Johannes Gröβ; Gerald Spindler; Konrad Müller; Yoshiteru Iinuma; Min Hu; Hartmut Herrmann; Alfred Wiedensohler. Influence of biomass burning on mixing state of sub-micron aerosol particles in the North China Plain. Atmospheric Environment 2017, 164, 259 -269.
AMA StyleSimonas Kecorius, Nan Ma, Monique Teich, Dominik Van Pinxteren, Shenglan Zhang, Johannes Gröβ, Gerald Spindler, Konrad Müller, Yoshiteru Iinuma, Min Hu, Hartmut Herrmann, Alfred Wiedensohler. Influence of biomass burning on mixing state of sub-micron aerosol particles in the North China Plain. Atmospheric Environment. 2017; 164 ():259-269.
Chicago/Turabian StyleSimonas Kecorius; Nan Ma; Monique Teich; Dominik Van Pinxteren; Shenglan Zhang; Johannes Gröβ; Gerald Spindler; Konrad Müller; Yoshiteru Iinuma; Min Hu; Hartmut Herrmann; Alfred Wiedensohler. 2017. "Influence of biomass burning on mixing state of sub-micron aerosol particles in the North China Plain." Atmospheric Environment 164, no. : 259-269.
Black carbon (BC) aerosol particles play an important role in regulating earth's climate and their climate effects depend on their mixing state. During the CAREBeijing 2013 campaign, we measured the size-resolved mixing state of refractory BC particles in North China Plain and performed intercomparison between a single particle soot photometer (SP2) and a volatility tandem differential mobility analyzer (VTDMA). The intercomparison shows a good agreement between the optical particle diameter determined by SP2 and the mobility particle diameter determined by VTDMA for non-BC as well as for internally mixed refractory BC particles. The VTDMA shows a higher concentration of refractory particles than that of the SP2, which suggests the existence of a large fraction of low volatile non-BC aerosols. Following parameters were constrained by closure studies to improve the inversion of the mixing state of ambient BC (i.e., coating thickness (CT) and shell/core ratio (Dp / Dc)) by SP2: a) refractive indices (RI) of 1.42 and 1.67–0.56i for non-BC and rBC core components, respectively, b) refractory BC (rBC) core density of 1.2 g cm−3 for internally-mixed BC particles, and c) an effective density range of 0.25–0.45 g cm−3 for externally-mixed BC particles. Moreover, the upper limit of the measurable particle size of SP2 was extended by the leading-edge-only (LEO) fit from ~ 400 nm to ~ 550 nm as confirmed by the VTDMA measurement. Based on the improved inversion from SP2 measurement, we found that non-BC containing particles, internally-mixed BC and externally-mixed BC contribute 85–90 %, 5–7 % and 5–10 % of the total aerosol number in the size range of 200 nm to 350 nm. The number fraction of internally-mixed BC in total BC-containing aerosols (Fin) shows pronounced diurnal cycles with a peak around noon time and an apparent turnover rate up to 6–9 % h−1. Such diurnal cycles are similar to the finding of Cheng et al. (2012) suggesting the competing effect of emissions and aging processes. In this study, the observed internally-mixed BC particles in the polluted regional NCP (North China Plain) background site (Xianghe) suggest a rapid aging process of BC on the regional scale. During the intensive field study period, ~ 80 % of internally-mixed BC particles at 200–300 nm showed a Dp / Dc ratio of more than 2, accompanying with an average value of 2.3–2.8. Meanwhile, the CT of internally-mixed BC particles (200–350 nm) with rBC core size of 80–200 nm was in the range of 50–150 nm. Compared with previous measurements in developed countries, the observed BC particles on regional scale (i.e., internally-mixed BC particles) were more-aged, indicating stronger optical and climate effect of BC on the regional scale in northern China.
Yuxuan Zhang; Hang Su; Simonas Kecorius; Zhibin Wang; Min Hu; Tong Zhu; Kebin He; Alfred Wiedensohler; Qiang Zhang; Yafang Cheng. Mixing State of Refractory Black Carbon of the North China Plain Regional Aerosol Combining a Single Particle Soot Photometer and a Volatility Tandem Differential Mobility Analyzer. Atmospheric Chemistry and Physics 2017, 1 -27.
AMA StyleYuxuan Zhang, Hang Su, Simonas Kecorius, Zhibin Wang, Min Hu, Tong Zhu, Kebin He, Alfred Wiedensohler, Qiang Zhang, Yafang Cheng. Mixing State of Refractory Black Carbon of the North China Plain Regional Aerosol Combining a Single Particle Soot Photometer and a Volatility Tandem Differential Mobility Analyzer. Atmospheric Chemistry and Physics. 2017; ():1-27.
Chicago/Turabian StyleYuxuan Zhang; Hang Su; Simonas Kecorius; Zhibin Wang; Min Hu; Tong Zhu; Kebin He; Alfred Wiedensohler; Qiang Zhang; Yafang Cheng. 2017. "Mixing State of Refractory Black Carbon of the North China Plain Regional Aerosol Combining a Single Particle Soot Photometer and a Volatility Tandem Differential Mobility Analyzer." Atmospheric Chemistry and Physics , no. : 1-27.
SummaryIn this study, we evaluated 10 months data (September 2009 to June 2010) of atmospheric aerosol particle number size distribution at three atmospheric observation stations along the Baltic Sea coast: Vavihill (upwind, Sweden), Utö (upwind, Finland), and Preila (downwind, Lithuania). Differences in aerosol particle number size distributions between the upwind and downwind stations during situations of connected atmospheric flow, when the air passed each station, were used to assess the contribution of ship emissions to the aerosol number concentration (diameter interval 50–400nm) in the Lithuanian background coastal environment. A clear increase in particle number concentration could be noticed, by a factor of 1.9 from Utö to Preila (the average total number concentration at Utö was 791cm−3), and by a factor of 1.6 from Vavihill to Preila (the average total number concentration at Vavihill was 998cm−3). The simultaneous measurements of absorption Ångström exponents close to unity at Preila supported our conclusion that ship emissions in the Baltic Sea contributed to the increase in particle number concentration at Preila
Simonas Kecorius; Niku Kivekäs; Adam Kristensson; Thomas Tuch; David S. Covert; Wolfram Birmili; Heikki Lihavainen; Antti-Pekka Hyvärinen; Johan Martinsson; Moa Sporre; Erik Swietlicki; Alfred Wiedensohler; Vidmantas Ulevicius. Significant increase of aerosol number concentrations in air masses crossing a densely trafficked sea area. Oceanologia 2016, 58, 1 -12.
AMA StyleSimonas Kecorius, Niku Kivekäs, Adam Kristensson, Thomas Tuch, David S. Covert, Wolfram Birmili, Heikki Lihavainen, Antti-Pekka Hyvärinen, Johan Martinsson, Moa Sporre, Erik Swietlicki, Alfred Wiedensohler, Vidmantas Ulevicius. Significant increase of aerosol number concentrations in air masses crossing a densely trafficked sea area. Oceanologia. 2016; 58 (1):1-12.
Chicago/Turabian StyleSimonas Kecorius; Niku Kivekäs; Adam Kristensson; Thomas Tuch; David S. Covert; Wolfram Birmili; Heikki Lihavainen; Antti-Pekka Hyvärinen; Johan Martinsson; Moa Sporre; Erik Swietlicki; Alfred Wiedensohler; Vidmantas Ulevicius. 2016. "Significant increase of aerosol number concentrations in air masses crossing a densely trafficked sea area." Oceanologia 58, no. 1: 1-12.
New particle formation is one of the major sources of atmospheric aerosol particles. Beside daytime nucleation, nocturnal new particle formation was also found in different regions around the world. Compared with daytime nucleation events, the understanding of nocturnal ones is still sparse. The variety of aerosol particle physico-chemical properties, including particle number size distribution, volatility and hygroscopicity were measured in the North China Plain during July–August 2013. During the observation period, rapid increase in ultrafine particle number concentration was attributed to new particle formation. The nocturnal new particle formation rate was 45 cm–3s–1, which is 1.25 times higher than an observed daytime value. Condensation sink was found to be 0.055 s–1.
Simonas Kecorius; Shenglan Zhang; Zhibin Wang; Johannes Größ; Nan Ma; Zhijun Wu; Liang Ran; Min Hu; Pucai Wang; Vidmantas Ulevičius; Alfred Wiedensohler. Nocturnal aerosol particle formation in the North China Plain. Lithuanian Journal of Physics 2015, 55, 1 .
AMA StyleSimonas Kecorius, Shenglan Zhang, Zhibin Wang, Johannes Größ, Nan Ma, Zhijun Wu, Liang Ran, Min Hu, Pucai Wang, Vidmantas Ulevičius, Alfred Wiedensohler. Nocturnal aerosol particle formation in the North China Plain. Lithuanian Journal of Physics. 2015; 55 (1):1.
Chicago/Turabian StyleSimonas Kecorius; Shenglan Zhang; Zhibin Wang; Johannes Größ; Nan Ma; Zhijun Wu; Liang Ran; Min Hu; Pucai Wang; Vidmantas Ulevičius; Alfred Wiedensohler. 2015. "Nocturnal aerosol particle formation in the North China Plain." Lithuanian Journal of Physics 55, no. 1: 1.