GSTDTAP  > 地球科学
DOI10.5194/acp-19-12025-2019
Quantifying snow darkening and atmospheric radiative effects of black carbon and dust on the South Asian monsoon and hydrological cycle: experiments using variable-resolution CESM
Rahimi, Stefan1; Liu, Xiaohong1; Wu, Chenglai1,2; Lau, William K.3; Brown, Hunter1; Wu, Mingxuan1; Qian, Yun4
2019-09-26
发表期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2019
卷号19期号:18页码:12025-12049
文章类型Article
语种英语
国家USA; Peoples R China
英文摘要

Black carbon (BC) and dust impart significant effects on the South Asian monsoon (SAM), which is responsible for similar to 80 % of the region's annual precipitation. This study implements a variable-resolution (VR) version of the Community Earth System Model (CESM) to quantify two radiative effects of absorbing BC and dust on the SAM. Specifically, this study focuses on the snow darkening effect (SDE), as well as how these aerosols interact with incoming and outgoing radiation to facilitate an atmospheric response (i.e., aerosol-radiation interactions, ARIs). By running sensitivity experiments, the individual effects of SDE and ARI are quantified, and a theoretical framework is applied to assess these aerosols' impacts on the SAM. It is found that ARIs of absorbing aerosols warm the atmospheric column in a belt coincident with the May-June averaged location of the subtropical jet, bringing forth anomalous upper-tropospheric (lower-tropospheric) anticyclogenesis (cyclogenesis) and divergence (convergence). This anomalous arrangement in the mass fields brings forth enhanced rising vertical motion across South Asia and a stronger westerly low-level jet, the latter of which furnishes the Indian subcontinent with enhanced Arabian Gulf moisture. Precipitation increases of 2 mm d(-1) or more (a 60% increase in June) result across much of northern India from May through August, with larger anomalies (+5 to +10 mm d(-1)) in the western Indian mountains and southern Tibetan Plateau (TP) mountain ranges due to orographic and anabatic enhancement. Across the Tibetan Plateau foothills, SDE by BC aerosols drives large precipitation anomalies of > 6 mm d(-1) (a 21 %-26% increase in May and June), comparable to ARI of absorbing aerosols from April through August. Runoff changes accompany BC SDE-induced snow changes across Tibet, while runoff changes across India result predominantly from dust ARI. Finally, there are large differences in the simulated SDE between the VR and traditional 1 degrees simulations, the latter of which simulates a much stronger SDE and more effectively modifies the regional circulation.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000488023500003
WOS关键词INDIAN-SUMMER MONSOON ; AEROSOL OPTICAL-PROPERTIES ; HIGH-ALTITUDE SITE ; TIBETAN PLATEAU ; PRECIPITATION VARIABILITY ; CHEMICAL-COMPOSITION ; CLIMATE SIMULATIONS ; MINERAL DUST ; LONG-TERM ; IMPACTS
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
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/187144
专题地球科学
作者单位1.Univ Wyoming, Dept Atmospher Sci, 1000 E Univ,1000 E Univ Ave, Laramie, WY 82071 USA;
2.Chinese Acad Sci, Inst Atmospher Phys, Int Ctr Climate & Environm Sci, Beijing 100029, Peoples R China;
3.Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20742 USA;
4.Pacific Northwest Natl Lab, Atmospher Sci & Global Change, POB 999, Richland, WA 99352 USA
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GB/T 7714
Rahimi, Stefan,Liu, Xiaohong,Wu, Chenglai,et al. Quantifying snow darkening and atmospheric radiative effects of black carbon and dust on the South Asian monsoon and hydrological cycle: experiments using variable-resolution CESM[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2019,19(18):12025-12049.
APA Rahimi, Stefan.,Liu, Xiaohong.,Wu, Chenglai.,Lau, William K..,Brown, Hunter.,...&Qian, Yun.(2019).Quantifying snow darkening and atmospheric radiative effects of black carbon and dust on the South Asian monsoon and hydrological cycle: experiments using variable-resolution CESM.ATMOSPHERIC CHEMISTRY AND PHYSICS,19(18),12025-12049.
MLA Rahimi, Stefan,et al."Quantifying snow darkening and atmospheric radiative effects of black carbon and dust on the South Asian monsoon and hydrological cycle: experiments using variable-resolution CESM".ATMOSPHERIC CHEMISTRY AND PHYSICS 19.18(2019):12025-12049.
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