气候变化领域集成服务门户(CCPortal): Impact of topography on black carbon transport to the southern Tibetan Plateau during the pre-monsoon season and its climatic implication

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DOI	10.5194/acp-20-5923-2020
	Impact of topography on black carbon transport to the southern Tibetan Plateau during the pre-monsoon season and its climatic implication
	Zhang M.; Zhao C.; Cong Z.; Du Q.; Xu M.; Chen Y.; Chen M.; Li R.; Fu Y.; Zhong L.; Kang S.; Zhao D.; Yang Y.
发表日期	2020
ISSN	1680-7316
起始页码	5923
结束页码	5943
卷号	20 期号:10
英文摘要	Most previous modeling studies about black carbon (BC) transport and its impact over the Tibetan Plateau (TP) conducted simulations with horizontal resolutions coarser than 20 km that may not be able to resolve the complex topography of the Himalayas well. In this study, the two experiments covering all of the Himalayas with the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) at the horizontal resolution of 4 km but with two different topography datasets (4 km complex topography and 20 km smooth topography) are conducted for pre-monsoon season (April 2016) to investigate the impacts of topography on modeling the transport and distribution of BC over the TP. Both experiments show the evident accumulation of aerosols near the southern Himalayas during the pre-monsoon season, consistent with the satellite retrievals. The observed episode of high surface BC concentration at the station near Mt. Everest due to heavy biomass burning near the southern Himalayas is well captured by the simulations. The simulations indicate that the prevailing upflow across the Himalayas driven by the large-scale westerly and small-scale southerly circulations during the daytime is the dominant transport mechanism of southern Asian BC into the TP, and it is much stronger than that during the nighttime. The simulation with the 4 km topography resolves more valleys and mountain ridges and shows that the BC transport across the Himalayas can overcome the majority of mountain ridges, but the valley transport is more efficient. The complex topography results in stronger overall crossHimalayan transport during the simulation period primarily due to the strengthened efficiency of near-surface meridional transport towards the TP, enhanced wind speed at some valleys and deeper valley channels associated with larger transported BC mass volume. This results in 50 % higher transport flux of BC across the Himalayas and 30 % 50 % stronger BC radiative heating in the atmosphere up to 10 km over the TP from the simulation with the 4 km complex topography than that with the 20 km smoother topography. The different topography also leads to different distributions of snow cover and BC forcing in snow. This study implies that the relatively smooth topography used by the models with resolutions coarser than 20 km may introduce significant negative biases in estimating light-absorbing aerosol radiative forcing over the TP during the pre-monsoon season. © 2020 Author(s).
语种	英语
scopus关键词	aerosol; black carbon; monsoon; radiative forcing; topographic effect; transport process; China; Himalayas; Qinghai-Xizang Plateau
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141332
作者单位	School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China; CAS Center for Excellence in Comparative Planetology, University of Science and Technology of China, Hefei, 230026, China; Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences (CAS), Beijing, 100101, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Institute of Tibetan Plateau Research, Chinese Academy of Sciences (CAS), Beijing, 100101, China; National Center for Atmospheric Research, Boulder, CO, United States; State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences (CAS), Lanzhou, 730000, China; Beijing Weather Modification Office, Beijing, 100101, China
推荐引用方式 GB/T 7714	Zhang M.,Zhao C.,Cong Z.,et al. Impact of topography on black carbon transport to the southern Tibetan Plateau during the pre-monsoon season and its climatic implication[J],2020,20(10).
APA	Zhang M..,Zhao C..,Cong Z..,Du Q..,Xu M..,...&Yang Y..(2020).Impact of topography on black carbon transport to the southern Tibetan Plateau during the pre-monsoon season and its climatic implication.Atmospheric Chemistry and Physics,20(10).
MLA	Zhang M.,et al."Impact of topography on black carbon transport to the southern Tibetan Plateau during the pre-monsoon season and its climatic implication".Atmospheric Chemistry and Physics 20.10(2020).