气候变化领域集成服务门户(CCPortal): Observed linkage between tibetan plateau soil moisture and South Asian summer precipitation and the possible mechanism

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DOI	10.1175/JCLI-D-20-0347.1
	Observed linkage between tibetan plateau soil moisture and South Asian summer precipitation and the possible mechanism
	Ullah W.; Guojie W.; Gao Z.; Hagan D.F.T.; Bhatti A.S.; Zhua C.
发表日期	2021
ISSN	0894-8755
起始页码	361
结束页码	377
卷号	34 期号:1
英文摘要	Understanding the Tibetan Plateau (TP) thermal processes is of utmost significance in changing climate. This study investigates the effect of soil moisture in changing the TP thermal profile and consequently summer precipitation in South Asia (SA). Soil moisture from Special Sensor Microwave Imager (SSM/I) developed from the F-08, F-11, and F-13 fundamental climate data record and atmospheric reanalysis from ERA-Interim, MERRA-2, and NCEP/CFSR during 1988-2008 are used. A generalized linear method that assesses the reciprocal forcing between two connected fields, named the coupled manifold technique (CMT), is applied to TP soil moisture and SA summer precipitation. It is revealed that interannual variations of SA precipitation are significantly (confidence level 5 99%) impacted by TP soil moisture and the explained ratio of variance in SA is 0.3-0.4. Composite analysis indicates that SA summer precipitation has positive anomalies in response to dry TP soil moisture in the previous spring and vice versa. For understanding the possible mechanism, thermal processes, relative humidity, wind components, and moisture flux anomalies were calculated for dry and wet TP soil moisture and summer precipitation. The results suggested that TP soil moisture is likely to regulate near-surface energy balance and diabatic heating profile over TP. As a result, the surrounding lower-level westerlies (easterlies) (at 850 hPa) converge (diverge), associated with divergence (convergence) at the upper troposphere (200 hPa). The westerlies (easterlies) are usually moisture-rich (moisture-deficient) and thus cause more (less) precipitation in western (eastern) SA. It is thus suggested that the spring soil moisture may affect the thermal profile of TP, affecting the summer precipitation in SA as a consequence. © 2021 American Meteorological Society. All rights reserved.
英文关键词	Atmospheric humidity; Microwave sensors; Moisture control; Soil moisture; Atmospheric reanalysis; Climate data records; Composite analysis; Confidence levels; Interannual variation; Possible mechanisms; Special sensor microwave imagers; Summer precipitation; Soil surveys; air temperature; atmospheric circulation; convergence; empirical orthogonal function analysis; land surface; land-atmosphere interaction; precipitation (climatology); principal component analysis; soil moisture; summer; China; Qinghai-Xizang Plateau
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170989
作者单位	Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), School of Geographical Sciences, Nanjing University of Information Science and Technology, Nanjing, China; State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Ullah W.,Guojie W.,Gao Z.,et al. Observed linkage between tibetan plateau soil moisture and South Asian summer precipitation and the possible mechanism[J],2021,34(1).
APA	Ullah W.,Guojie W.,Gao Z.,Hagan D.F.T.,Bhatti A.S.,&Zhua C..(2021).Observed linkage between tibetan plateau soil moisture and South Asian summer precipitation and the possible mechanism.Journal of Climate,34(1).
MLA	Ullah W.,et al."Observed linkage between tibetan plateau soil moisture and South Asian summer precipitation and the possible mechanism".Journal of Climate 34.1(2021).