气候变化领域集成服务门户(CCPortal): Modulation of springtime surface sensible heating over the Tibetan Plateau on the interannual variability of East Asian dust cycle

CCPortal

DOI	10.5194/acp-20-11143-2020
	Modulation of springtime surface sensible heating over the Tibetan Plateau on the interannual variability of East Asian dust cycle
	Xie X.; Duan A.; Shi Z.; Li X.; Sun H.; Liu X.; Cheng X.; Zhao T.; Che H.; Liu Y.
发表日期	2020
ISSN	1680-7316
起始页码	11143
结束页码	11159
卷号	20 期号:18
英文摘要	Previous observational evidence and numerical simulations have revealed that the surface sensible heating in spring (March-April-May, MAM) over the Tibetan Plateau (TPSH) can affect the Asian regional hydrological cycle, surface energy balance, and climate through altering atmospheric heat source of the Tibetan Plateau (TP). This study aims to investigate the impacts of MAM TPSH on the interannual variability of East Asian dust cycle by using CAM4-BAM (version 4 of the Community Atmosphere Model coupled to a bulk aerosol model), MERRA-2 (version 2 of the Modern-Era Retrospective analysis for Research and Applications) surface dust concentration, and TPSH measurements. Our simulations show that the surface dust concentrations over the East Asian (EA) dust source region and over the northwestern Pacific (NP) in MAM are significantly positively correlated with TPSH, with regionally averaged correlation coefficients of 0.49 for EA and 0.44 for NP. Similar positive correlations are also shown between the MAM TPSH measurements averaged over the 73 observation sites and the surface dust concentration from MERRA-2. Simulation-based comparisons between strongest and weakest TPSH years reveal that, the MAM surface dust concentration in the strongest TPSH years increases with relative differences of 13.1% over EA and 36.9% over NP. These corresponding differences are found in MERRA-2 with 22.9% and 13.3% over EA and NP, respectively. Further simulated results show that the processes of whole dust cycles (e.g., dust loading, emission, and transport, as well as dust deposition) are also significantly enhanced during the strongest TPSH years over EA and NP. Through enhancing the TP heat source, stronger TPSH in MAM generates an anticyclonic anomaly in middle and upper troposphere over the TP and over the downstream Pacific region, respectively. These atmospheric circulation anomalies induced by the increased TPSH result in increasing the westerly winds over both EA and NP, which in turn increases dust emissions over the dust source, and dust transport over these two regions, as well as the regional dust cycles. These results suggest that addressing the East Asian dust changes in the future climates requires considering not only increasing greenhouse gas emissions but also the variations of the TP's heat source under global warming. © Author(s) 2020.
语种	英语
scopus关键词	annual variation; carbon emission; dust; energy balance; greenhouse gas; heat source; hydrological cycle; sensible heat flux; surface energy; westerly; China; 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/247504
作者单位	SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; CAS Center for Excellence in Quaternary Science and Global Change, Xi'an, 710061, China; LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Science Information AndTechnology, Nanjing, 210044, China; Key Laboratory for Atmospheric Chemistry, Institute of Atmospheric Composition, Chinese Academy of Meteorological Sciences, CMA, Beijing, 100081, China; Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, NY 11973-5000, United States
推荐引用方式 GB/T 7714	Xie X.,Duan A.,Shi Z.,et al. Modulation of springtime surface sensible heating over the Tibetan Plateau on the interannual variability of East Asian dust cycle[J],2020,20(18).
APA	Xie X..,Duan A..,Shi Z..,Li X..,Sun H..,...&Liu Y..(2020).Modulation of springtime surface sensible heating over the Tibetan Plateau on the interannual variability of East Asian dust cycle.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(18).
MLA	Xie X.,et al."Modulation of springtime surface sensible heating over the Tibetan Plateau on the interannual variability of East Asian dust cycle".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.18(2020).