A004-0015
Long-term increase in atmospheric stagnant conditions over northeast Asia and the role of greenhouse gases-driven warming

Monday, 7 December 2020
Poster
Dasom Lee1, Shih-Yu (Simon) Wang2, Lin Zhao3, Hyun C Kim4,5, Kwanchul Kim6 and JinHo Yoon1, (1)GIST Gwangju Institute of Science and Technology, Gwangju, Korea, Republic of (South), (2)Utah State University, Department of Plant, Soils and Climate, Logan, UT, United States, (3)Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China, (4)NOAA Air Resources Laboratory, College Park, MD, United States, (5)Cooperative Institute for Satellite Earth-System Studies, University of Maryland, College Park, MD, United States, (6)Advanced Institute of Convergence Technology (AICT), Seoul National University, Suwon-si, Gyeonggi-do, South Korea
Abstract:
The recent trend in air quality of urban South Korea prompted the authors to examine the long-term changes in the near-surface wind speed and its link with the lower atmospheric circulation, using modern reanalysis datasets. Analyses based upon JRA-55 data show a negative correlation between near-surface wind speed and static stability over the Yellow Sea and the western part of South Korea. Near-surface wind speed shows a clear declining trend accompanied with increased static stability, while their negative correlation appears to strengthen in recent years. Further investigations using CMIP5 single-forcing experiments suggest that global warming due to anthropogenic greenhouse gases likely caused the static stability increase in the lower troposphere, implying further atmospheric stagnant condition in the future.
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