Investigating processes influencing simulation of local Arctic wintertime anthropogenic pollution in Fairbanks, Alaska during ALPACA-2022

• Main Authors: Brett, Natalie, Law, Kathy S., Arnold, Steve, R, Fochesatto, Javier, G, Raut, Jean-Christophe, Onishi, Tatsuo, Gilliam, Robert, Fahey, Kathleen, Huff, Deanna, Pouliot, George, Barret, Brice, Dieudonné, Elsa, Pohorsky, Roman, Schmale, Julia, Baccarini, Andrea, Bekki, Slimane, Pappaccogli, Gianluca, Scoto, Federico, Decesari, Stefano, Donateo, Antonio, Cesler-Maloney, Meeta, Simpson, William, Medina, Patrice, d'Anna, Barbara, Temime-Roussel, Brice, Savarino, Joel, Albertin, Sarah, Mao, Jingqiu, Alexander, Becky, Moon, Allison, Decarlo, Peter, F, Selimovic, Vanessa, Yokelson, Robert, Robinson, Ellis, S
• Other Authors: Institute for Climate and Atmospheric Science Leeds (ICAS), School of Earth and Environment Leeds (SEE), University of Leeds-University of Leeds, 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), Department of Atmospheric Sciences Fairbanks, University of Alaska Fairbanks (UAF), Center for Environmental Measurement and Modeling (CEMM), US Environmental Protection Agency (EPA), Alaska Department of Environmental Conservation (ADEC), Laboratoire d'aérologie (LAERO), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), 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 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 de Physico-Chimie de l'Atmosphère (LPCA), Université du Littoral Côte d'Opale (ULCO), Extreme Environments Research Laboratory (EERL), Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratory of Atmospheric Processes and their Impacts (LAPI), Istituto di Scienze dell'Atmosfera e del Clima Lecce (ISAC), National Research Council of Italy, Istituto di Scienze dell'Atmosfera e del Clima Bologna (ISAC), Geophysical Institute Fairbanks, Department of Chemistry and Biochemistry Fairbanks, Laboratoire Chimie de l'environnement (LCE), Aix Marseille Université (AMU)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut des Géosciences de l’Environnement (IGE), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Observatoire des Sciences de l'Univers de Grenoble (Fédération OSUG)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP), Université Grenoble Alpes (UGA), Department of Atmospheric Sciences Seattle, University of Washington Seattle, Department of Environmental Health and Engineering Baltimore, Johns Hopkins University (JHU), Department of Chemistry Ann Arbor, University of Michigan Ann Arbor, University of Michigan System-University of Michigan System, Department of Chemistry and Biochemistry Missoula, University of Montana, ANR-21-CE01-0017,CASPA,Sources d'aérosols et processus liés au climat dans l'Arctique(2021)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2024
• Subjects: [SDE]Environmental Sciences; Arctic; Fairbanks; Alaska
• Online Access: https://insu.hal.science/insu-04600652; https://insu.hal.science/insu-04600652v1/document; https://insu.hal.science/insu-04600652v1/file/egusphere-2024-1450.pdf; https://doi.org/10.5194/egusphere-2024-1450

International audience Lagrangian tracer simulations are deployed to investigate processes influencing vertical and horizontal dispersion of anthropogenic pollution in Fairbanks, Alaska, during the ALPACA-2022 field campaign. Simulations of carbon monoxide (CO), sulphur dioxide (SO2) and nitrogen oxides (NOx), including surface and elevated emissions, are highest at the surface under very cold stable conditions. Regional enhancements, simulated up to 200 m, are due to elevated power plant emissions above 50 m, with south-westerly pollutant outflow. Fairbanks regional pollution may be contributing to wintertime Arctic haze. Inclusion of a novel power plant plume rise treatment that considers the presence of surface and elevated temperature inversion layers leads to improved agreement with observed CO and NOx plumes with discrepancies attributed to, for example, displacement of plumes by modelled winds. At the surface, model results show that observed CO variability is largely driven by meteorology and to a lesser extent by emissions, although simulated tracers are sensitive to modelled vertical dispersion. Modelled underestimation of surface NOx during very cold polluted conditions is considerably improved following the inclusion of substantial increases in diesel vehicle NOx emissions at cold temperatures (e.g. a factor of 6 at -30 °C). In contrast, overestimation of surface SO2 is attributed to issues related to the vertical dispersion of elevated space heating emissions during strongly and weakly stable conditions. This study highlights the need for improvements to local wintertime Arctic anthropogenic surface and elevated emissions and improved simulation of Arctic stable boundary layers.