Sensitivity of Wintertime Arctic Black Carbon to Removal Processes and Regional Alaskan Sources
Abstract Air pollutants are primarily transported from midlatitude emission regions in winter and early spring, leading to elevated concentrations of aerosols, including black carbon (BC), in the Arctic, a phenomenon known as Arctic haze. The Weather Research and Forecasting model coupled with chemistry is used to investigate potential causes of uncertainties in modeling Arctic BC for winter 2014. The model captures observed variability in BC at surface sites, reproducing BC concentrations at Zeppelin but showing a low bias at Tiksi, Alert, and Utqiaġvik/Barrow. The influence of removal processes on model BC biases is explored by switching off dry or wet deposition. Wet deposition, during transport in the North Atlantic storm track, and locally over Svalbard, dominates BC removal at Zeppelin, while wet removal in the Pacific storm track influences BC at Alert and Utqiaġvik/Barrow. Dry removal over Asian source regions and Alaska affects BC at Utqiaġvik/Barrow, and is larger than wet removal at Tiksi due to the proximity of local/regional anthropogenic sources. Regional runs over northern Alaska in late January show improved simulated BC compared to observations at Utqiaġvik/Barrow, in part, due to better resolution of removal processes, and local/regional emissions. Sensitivity runs also show that regional Alaskan sources, notably from the North Slope of Alaska oil fields, may be contributing 30%–50%, on average, to observed BC at Utqiaġvik/Barrow in January and February 2014, with the remainder from outside the region. These findings highlight the importance of local Arctic emissions, and the need for improved emission inventories in the Arctic.
Authors
- Sho Ohata (ORCID: https://orcid.org/0000-0002-6777-0662)
- Y. Kondo
- Patricia K. Quinn (ORCID: https://orcid.org/0000-0003-0337-4895)
- Zbigniew Klimont (ORCID: https://orcid.org/0000-0003-2630-198X)
- Jean‐Christophe Raut (ORCID: https://orcid.org/0000-0002-3552-2437)
- Tatsuo Onishi
- Louis Marelle (ORCID: https://orcid.org/0000-0003-4925-0046)
- Sara Morris (ORCID: https://orcid.org/0000-0002-2698-1068)
- Kerri A. Pratt (ORCID: https://orcid.org/0000-0003-4707-2290)
- Tatsuhiro Mori (ORCID: https://orcid.org/0000-0001-5692-143X)
- Konstantinos Eleftheriadis (ORCID: https://orcid.org/0000-0003-2265-4905)
- Elisabeth Andrews (ORCID: https://orcid.org/0000-0002-9394-024X)
- Antonin Soulie
- Sangeeta Sharma (ORCID: https://orcid.org/0000-0002-9071-1812)
- Claire Granier (ORCID: https://orcid.org/0000-0002-3007-6044)
- Kathy S. Law (ORCID: https://orcid.org/0000-0003-4479-903X)
- Eleftherios Ioannidis (ORCID: https://orcid.org/0000-0002-2962-4103)
Institutions
- Centre National de la Recherche Scientifique (FR)
- National Oceanic and Atmospheric Administration (US)
- International Institute for Applied Systems Analysis (AT)
- Environment and Climate Change Canada (CA)
- Université Toulouse III - Paul Sabatier (FR)
- Cooperative Institute for Research in Environmental Sciences (US)
- Université Fédérale de Toulouse Midi-Pyrénées (FR)
- Université Sorbonne Nouvelle (FR)
- Université de Versailles Saint-Quentin-en-Yvelines (FR)
- National Centre of Scientific Research "Demokritos" (GR)
- Keio University (JP)
- University of Michigan (US)
- NOAA Pacific Marine Environmental Laboratory (US)
- National Institute of Polar Research (JP)
- Sorbonne Université (FR)
- Laboratoire d'Aérologie (FR)
- NOAA Chemical Sciences Laboratory (US)
- Laboratoire atmosphères, milieux, observations spatiales (FR)
- Institute of Nuclear & Radiological Sciences and Technology, Energy & Safety
- Nagoya University (JP)
- Vrije Universiteit Amsterdam (NL)
Publication Details
- Journal
- Journal of Geophysical Research Atmospheres
- Published
- 2025-04-08
- DOI
- https://doi.org/10.1029/2024jd042885
- Citations
- 2
- Primary Topic
- Atmospheric and Environmental Gas Dynamics
- Type
- article
- Field-Weighted Citation Impact
- 2.21
Funders
- Grand Équipement National De Calcul Intensif