GSTDTAP  > 地球科学
DOI10.5194/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, Meixin1; Zhao, Chun1,2; Cong, Zhiyuan3,4; Du, Qiuyan1; Xu, Mingyue1; Chen, Yu1; Chen, Ming5; Li, Rui1; Fu, Yunfei1; Zhong, Lei1; Kang, Shichang4,6; Zhao, Delong7; Yang, Yan7
2020-05-19
发表期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2020
卷号20期号:10页码:5923-5943
文章类型Article
语种英语
国家Peoples R China; USA
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 cross-Himalayan 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.


Highlights.


1. The black carbon (BC) transport across the Himalayas can overcome the majority of mountain ridges, but the valley transport is much more efficient during the pre-monsoon season.


2. The complex topography results in stronger overall cross-Himalayan transport during the study 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.


3. The complex topography generates 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 Tibetan Plateau (TP) than the smoother topography, which implies that the smooth topography used by the models with relatively coarse resolution may introduce significant negative biases in estimating BC radiative forcing over the TP during the pre-monsoon season.


4. The different topography also leads to different distributions of snow cover and BC forcing in snow over the TP.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000537120000002
WOS关键词ASIAN SUMMER MONSOON ; 4-DIMENSIONAL DATA ASSIMILATION ; AEROSOL OPTICAL-PROPERTIES ; LIGHT-ABSORBING PARTICLES ; ATMOSPHERIC BROWN CLOUDS ; KALI GANDAKI VALLEY ; AIR-POLLUTION ; MINERAL DUST ; PRECIPITATION CHARACTERISTICS ; ANTHROPOGENIC AEROSOLS
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
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引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/267542
专题地球科学
作者单位1.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Peoples R China;
2.Univ Sci & Technol China, CAS Ctr Excellence Comparat Planetol, Hefei 230026, Peoples R China;
3.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China;
4.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China;
5.Natl Ctr Atmospher Res, Boulder, CO USA;
6.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou 730000, Peoples R China;
7.Beijing Weather Modificat Off, Beijing 100101, Peoples R China
推荐引用方式
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Zhang, Meixin,Zhao, Chun,Cong, Zhiyuan,et al. Impact of topography on black carbon transport to the southern Tibetan Plateau during the pre-monsoon season and its climatic implication[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2020,20(10):5923-5943.
APA Zhang, Meixin.,Zhao, Chun.,Cong, Zhiyuan.,Du, Qiuyan.,Xu, Mingyue.,...&Yang, Yan.(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),5923-5943.
MLA Zhang, Meixin,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):5923-5943.
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