Wintertime anthropogenic Arctic Air Pollution over Alaska

• Main Authors: Ioannidis, Eleftherios, Law, Kathy S., Raut, Jean-Christophe, Onishi, Tatsuo, Marelle, Louis, Roberts, Tjarda, J, Barret, Brice, d'Anna, Barbara, Temine-Roussel, Brice, Kirpes, Rachel, M., Pratt, Kerri, A., Upchurch, Lucia, Quinn, Patricia, K., Andrews, Elisabeth, Ohata, Sho, Mori, Tatsuhiro, Kondo, Yutaka, Mölders, Nicole, Cesler‐maloney, Meeta, Mao, Jingqui, Simpson, William, R.
• Other Authors: TROPO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales Paris (CNES), Laboratoire d'aérologie (LAERO), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS), Laboratoire Chimie de l'environnement (LCE), Aix Marseille Université (AMU)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS), Department of Chemistry Ann Arbor, University of Michigan Ann Arbor, University of Michigan System-University of Michigan System, Department of Earth and Environmental Sciences Ann Arbor, NOAA Pacific Marine Environmental Laboratory Seattle (PMEL), National Oceanic and Atmospheric Administration (NOAA), Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado Boulder -National Oceanic and Atmospheric Administration (NOAA), Institute for Space-Earth Environmental Research Nagoya (ISEE), Nagoya University, Graduate School of Science Tokyo, The University of Tokyo (UTokyo), National Institute of Polar Research Tokyo (NiPR), Geophysical Institute Fairbanks, University of Alaska Fairbanks (UAF), Department of Chemistry and Biochemistry Fairbanks
• Format: Conference Object
• Language: English
• Published: HAL CCSD 2021
• Subjects: [SDE]Environmental Sciences; Arctic; Prudhoe Bay; Alaska
• Online Access: https://insu.hal.science/insu-03747187

International audience Air pollution transported from mid-latitudes influences the Arctic during wintertime, leading to the formation of Arctic Haze.Local emissions, such as combustion for heating in cold winter conditions, also contribute to wintertime air pollution. However,the formation of secondary aerosol particles in cold/dark wintertime Arctic conditions, is poorly understood.In this study, which contributes to the Air Pollution in the Arctic: Climate, Environment and Societies - Alaskan Layered Pollutionand Arctic Chemical Analysis (PACES-ALPACA) initiative, the Weather Research Forecasting Model with chemistry (WRF-Chem) is used to investigate wintertime pollution over Alaska focusing on Prudhoe Bay and the Fairbanks region,respectively. Fairbanks is the most polluted city in the United States during wintertime, due to high local emissions and theoccurrence of strong surface temperature inversions trapping pollutants near the surface. On the other hand, the Prudhoe Bayoilfields contribute to wintertime air pollution in northern Alaska.In a first study, the sensitivity of simulated aerosols to local anthropogenic emissions is investigated over northern Alaska andevaluated against observations at Utqiaġvik, collected during a campaign in Jan-Feb 2014. FLEXible PARTicle dispersionmodel coupled with WRF, is also used to identify the pollutant origins in air masses in the boundary layer, which are influencingUtqiaġvik during periods with elevated aerosols. The contribution of locally produced anthropogenic and natural aerosolsrelative to remote pollutants is also examined.In a second study, focusing on winter 2019 (ALPACA pre-campaign) over Fairbanks, large-scale synoptic conditions and remote anthropogenic sources affecting background aerosols are estimated. The sensitivity ofsecondary aerosol formation to meteorological factors, such as relative humidity, boundary layer stability are examined.Discrepancies in modelled secondary aerosols compared to available data are investigated (e.g. missing dark ...