气候变化领域集成服务门户(CCPortal): Summer afternoon precipitation associated with wind convergence near the Himalayan glacier fronts

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DOI	10.1016/j.atmosres.2021.105658
	Summer afternoon precipitation associated with wind convergence near the Himalayan glacier fronts
	Lin, Changgui; Yang, Kun; Chen, Deliang; Guyennon, Nicolas; Balestrini, Raffaella; Yang, Xiaoxin; Acharya, Sunil; Ou, Tinghai; Yao, Tandong; Tartari, Gianni; Salerno, Franco
通讯作者	Lin, CG ; Chen, DL (通讯作者)
发表日期	2021
ISSN	0169-8095
EISSN	1873-2895
卷号	259
英文摘要	Little is known about the effects of glacier-air interactions on the Himalayan glacier mass balance. Until this knowledge gap is filled, a reliable projection of the future changes in the Himalayan glaciers is hardly possible. Here, we describe the drying effect of the katabatic winds on the up-valley summer monsoon flows by creating favorable conditions for local convergence-induced precipitation to occur near the glacier fronts. We postulate that this retarding effect on the up-valley monsoon flows results in a negative feedback mechanism mediated by glacier-air interactions, in which glacial retreat pushes precipitation upwards as the down-valley katabatic winds weaken, resulting in greater local precipitation and enhanced snow accumulation across the upper parts of the Himalayan glaciers. Our analyses are based on the exclusive data recorded in the Khumbu valley and the Langtang valley in the Nepalese Himalayas. These data revealed higher afternoon precipitation in summer associated with surface wind convergence near the glacier fronts and a sharp decrease in the temperature lapse rate over the glacier surfaces. The principle of the observed phenomena was proven by our high-resolution modeling sensitive experiment, which involved two simulations, one with the present glaciers and the other without. This numerical experiment also supports the proposed negative feedback. Furthermore, we report a low deuterium excess near the glacier fronts, indicating below-cloud re-evaporation facilitated by the local convergence induced by the dry katabatic winds. Our study suggests that current models may overestimate the retreat of Himalayan glaciers because they have completely ignored the glacier-air interactions.
关键词	DEUTERIUM EXCESS MASS-BALANCE WATER AVAILABILITY TIBETAN PLATEAU STABLE-ISOTOPES CLIMATE IMPACT SOUTH ALTITUDE MONSOON
英文关键词	Glacier-air interactions; Himalayan glaciers; Glacier mass balance; Feedback mechanism; Elevational dependence
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000663572900002
来源期刊	ATMOSPHERIC RESEARCH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260493
推荐引用方式 GB/T 7714	Lin, Changgui,Yang, Kun,Chen, Deliang,et al. Summer afternoon precipitation associated with wind convergence near the Himalayan glacier fronts[J]. 中国科学院青藏高原研究所,2021,259.
APA	Lin, Changgui.,Yang, Kun.,Chen, Deliang.,Guyennon, Nicolas.,Balestrini, Raffaella.,...&Salerno, Franco.(2021).Summer afternoon precipitation associated with wind convergence near the Himalayan glacier fronts.ATMOSPHERIC RESEARCH,259.
MLA	Lin, Changgui,et al."Summer afternoon precipitation associated with wind convergence near the Himalayan glacier fronts".ATMOSPHERIC RESEARCH 259(2021).