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Your search keyword '"Ryjkov, Andrei"' showing total 12 results
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12 results on '"Ryjkov, Andrei"'

1. The Multi-Compartment Hg Modeling and Analysis Project (MCHgMAP): Mercury modeling to support international environmental policy

Author

Dastoor, Ashu, primary, Angot, Hélène, additional, Bieser, Johannes, additional, Brocza, Flora, additional, Edwards, Brock, additional, Feinberg, Aryeh, additional, Feng, Xinbin, additional, Geyman, Benjamin, additional, Gournia, Charikleia, additional, He, Yipeng, additional, Hedgecock, Ian M., additional, Ilyin, Ilia, additional, Keating, Terry, additional, Kirk, Jane, additional, Lin, Che-Jen, additional, Lehnherr, Igor, additional, Mason, Robert, additional, McLagan, David, additional, Muntean, Marilena, additional, Rafaj, Peter, additional, Roy, Eric M., additional, Ryjkov, Andrei, additional, Selin, Noelle E., additional, De Simone, Francesco, additional, Soerensen, Anne L., additional, Steenhuisen, Frits, additional, Travnikov, Oleg, additional, Wang, Shuxiao, additional, Wang, Xun, additional, Wilson, Simon, additional, Wu, Rosa, additional, Wu, Qingru, additional, Zhang, Yanxu, additional, Zhou, Jun, additional, Zhu, Wei, additional, and Zolkos, Scott, additional

Published
2024
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2. Arctic mercury cycling

Author

Dastoor, Ashu, Angot, Hélène, Bieser, Johannes, Christensen, Jesper H., Douglas, Thomas A., Heimbürger-Boavida, Lars-Eric, Jiskra, Martin, Mason, Robert P., McLagan, David S., Obrist, Daniel, Outridge, Peter M., Petrova, Mariia V., Ryjkov, Andrei, St. Pierre, Kyra A., Schartup, Amina T., Soerensen, Anne L., Toyota, Kenjiro, Travnikov, Oleg, Wilson, Simon J., and Zdanowicz, Christian

Published
2022
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4. Diet and landscape characteristics drive spatial patterns of mercury accumulation in a high-latitude terrestrial carnivore

Author

Peraza, Inés, primary, Chételat, John, additional, Richardson, Murray, additional, Jung, Thomas S., additional, Awan, Malik, additional, Baryluk, Steve, additional, Dastoor, Ashu, additional, Harrower, William, additional, Kukka, Piia M., additional, McClelland, Christine, additional, Mowat, Garth, additional, Pelletier, Nicolas, additional, Rodford, Christine, additional, and Ryjkov, Andrei, additional

Published
2023
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7. Modelling the coupled mercury-halogen-ozone cycle in the central Arctic during spring

Author

Ahmed, Shaddy, primary, Thomas, Jennie L., additional, Angot, Hélène, additional, Dommergue, Aurélien, additional, Archer, Stephen D., additional, Bariteau, Ludovic, additional, Beck, Ivo, additional, Benavent, Nuria, additional, Blechschmidt, Anne-Marlene, additional, Blomquist, Byron, additional, Boyer, Matthew, additional, Christensen, Jesper H., additional, Dahlke, Sandro, additional, Dastoor, Ashu, additional, Helmig, Detlev, additional, Howard, Dean, additional, Jacobi, Hans-Werner, additional, Jokinen, Tuija, additional, Lapere, Rémy, additional, Laurila, Tiia, additional, Quéléver, Lauriane L. J., additional, Richter, Andreas, additional, Ryjkov, Andrei, additional, Mahajan, Anoop S., additional, Marelle, Louis, additional, Pfaffhuber, Katrine Aspmo, additional, Posman, Kevin, additional, Rinke, Annette, additional, Saiz-Lopez, Alfonso, additional, Schmale, Julia, additional, Skov, Henrik, additional, Steffen, Alexandra, additional, Stupple, Geoff, additional, Stutz, Jochen, additional, Travnikov, Oleg, additional, and Zilker, Bianca, additional

Published
2023
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9. An Improved Representation of Aerosol Mixing State for Air-Quality-Weather Interactions

Author

Stevens, Robin, Ryjkov, Andrei, Majdzadeh, Mahtab, and Dastoor, Ashu

Abstract

We implement a detailed representation of aerosol mixing state in the Global Environmental Multiscale – Modelling Air quality and CHemistry (GEM-MACH) air quality and weather forecast model. Our mixing-state representation includes three categories: one for more hygroscopic aerosol, one for less hygroscopic aerosol with a high black carbon (BC) mass fraction, and one for less hygroscopic aerosol with a low BC mass fraction. The more detailed representation allows us to better resolve two different aspects of aerosol mixing state: differences in hygroscopicity due to aerosol composition and the amount of absorption enhancement of BC due to non-absorbing coatings. Notably, this three-category representation allows us to account for BC thickly coated with primary organic matter, which enhances the absorption of the BC but has a low hygroscopicity. We compare the results of the three-category representation (1L2B, (one hydrophilic, two hydrophobic)) with a simulation that uses two categories, split by hygroscopicity (HYGRO), and a simulation using the original size-resolved internally mixed assumption (SRIM). We perform a case study that is focused on North America during July 2016, when there were intense wildfires over northwestern North America. We find that the more detailed representation of the aerosol hygroscopicity in both 1L2B and HYGRO decreases wet deposition, which increases aerosol concentrations, particularly of less hygroscopic species. The concentration of PM2.5 increases by 23 % on average. We show that these increased aerosol concentrations increase cloud droplet number concentrations and cloud reflectivity in the model, decreasing surface temperatures. Using two categories based on hygroscopicity yields only a modest benefit in resolving the coating thickness on black carbon, however. The 1L2B representation resolves BC with thinner coatings than the HYGRO simulation, resulting in absorption aerosol optical depths that are 3 % less on average, with greater differences over strong anthropogenic source regions. We did not find strong subsequent effects of this decreased absorption on meteorology.

Published
2022

11. Quantification of Spatial and Temporal Trends in Atmospheric Mercury Deposition across Canada over the Past 30 Years

Author

Roberts, Sarah L., primary, Kirk, Jane L., additional, Muir, Derek C. G., additional, Wiklund, Johan A., additional, Evans, Marlene S., additional, Gleason, Amber, additional, Tam, Allison, additional, Drevnick, Paul E., additional, Dastoor, Ashu, additional, Ryjkov, Andrei, additional, Yang, Fan, additional, Wang, Xiaowa, additional, Lawson, Greg, additional, Pilote, Martin, additional, Keating, Jonathan, additional, Barst, Benjamin D., additional, Ahad, Jason M. E., additional, and Cooke, Colin A., additional

Published
2021
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