气候变化领域集成服务门户(CCPortal): Satellite-observed monthly glacier and snow mass changes in southeast Tibet: Implication for substantial meltwater contribution to the Brahmaputra

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DOI	10.5194/tc-14-2267-2020
	Satellite-observed monthly glacier and snow mass changes in southeast Tibet: Implication for substantial meltwater contribution to the Brahmaputra
	Yi S.; Song C.; Heki K.; Kang S.; Wang Q.; Chang L.
发表日期	2020
ISSN	19940416
起始页码	2267
结束页码	2281
卷号	14 期号:7
英文摘要	High-Asia glaciers have been observed to be retreating the fastest in the southeastern Tibet Plateau (SETP), where vast numbers of glaciers and amounts of snow feed the streamflow of the Brahmaputra, a transboundary river linking the world's two most populous countries, China and India. However, the low temporal resolutions in previous observations of glacier and snow (GS) mass balance obscured the seasonal accumulation ablation variations, and their modelling estimates were divergent. Here we use monthly satellite gravimetry observations from August 2002 to June 2017 to estimate GS mass variation in the SETP. We find that the "spring-accumulation-type"glaciers and snow in the SETP reach their maximum in May. This is in stark contrast to seasonal variations in terrestrial water storage, which is controlled by summer precipitation and reaches the maximum in August. These two seasonal variations are mutually orthogonal and can be easily separated in time-variable gravity observations. Our GS mass balance results show a longterm trend of -6:5±0:8 Gt yr-1 (or 0:67±0:08 m w.e. yr-1) and annual mass decreases ranging from -49:3 to -78:3 Gt with an average of -64:5 ± 8:9 Gt in the SETP between August 2002 and June 2017. The contribution of summer meltwater to the Brahmaputra streamflow is estimated to be 51 ± 9 Gt. This result could help to resolve previous divergent modelling estimates and underlines the importance of meltwater to the Brahmaputra streamflow. The high sensitivity between GS melting and temperature on both annual and monthly scales suggests that the Brahmaputra will suffer from not only changes in total annual discharge but also an earlier runoff peak due to ongoing global warming. © 2020 Author(s).
英文关键词	glacier; glacier mass balance; glacier retreat; global warming; meltwater; observational method; precipitation (climatology); runoff; seasonal variation; streamflow; Brahmaputra River; China; India; Qinghai-Xizang Plateau
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202258
作者单位	Institute of Geodesy, University of Stuttgart, Stuttgart, 70174, Germany; Department of Earth and Planetary Sciences, Hokkaido University, Sapporo, 060-0808, Japan; Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China; State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, CAS, Beijing, 100101, China; Key Laboratory of Computational Geodynamics, University of Chinese Academy of Sciences, Beijing, 100049, China
推荐引用方式 GB/T 7714	Yi S.,Song C.,Heki K.,et al. Satellite-observed monthly glacier and snow mass changes in southeast Tibet: Implication for substantial meltwater contribution to the Brahmaputra[J],2020,14(7).
APA	Yi S.,Song C.,Heki K.,Kang S.,Wang Q.,&Chang L..(2020).Satellite-observed monthly glacier and snow mass changes in southeast Tibet: Implication for substantial meltwater contribution to the Brahmaputra.Cryosphere,14(7).
MLA	Yi S.,et al."Satellite-observed monthly glacier and snow mass changes in southeast Tibet: Implication for substantial meltwater contribution to the Brahmaputra".Cryosphere 14.7(2020).