globalchange  > 气候变化与战略
DOI: 10.5194/tc-14-2267-2020
论文题名:
Satellite-observed monthly glacier and snow mass changes in southeast Tibet: Implication for substantial meltwater contribution to the Brahmaputra
作者: Yi S.; Song C.; Heki K.; Kang S.; Wang Q.; Chang L.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期:7
起始页码: 2267
结束页码: 2281
语种: 英语
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
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).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164636
Appears in Collections:气候变化与战略

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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

Recommended Citation:
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]. Cryosphere,2020-01-01,14(7)
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