干旱区生态环境知识资源中心(Arid): Hydrological variability in southern Siberia and the role of permafrost degradation

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DOI	10.1016/j.jhydrol.2021.127203
	Hydrological variability in southern Siberia and the role of permafrost degradation
	Han, Li; Menzel, Lucas
通讯作者	Han, L (corresponding author)，Heidelberg Univ, Dept Geog, Hydrol & Climatol, D-69120 Heidelberg, Germany.
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2022
卷号	604
英文摘要	Changes in the cryosphere caused by global warming are expected to alter the hydrological cycle, with consequences to freshwater availability for humans and ecosystems. Here, we combine data assimilation, cross correlation analysis, simulation techniques, and the conceptual steady-state Budyko framework to examine the driving mechanisms of historical hydrological changes at annual, seasonal, and monthly scales. We focus on two southern Siberian basins with different landscape properties: the semi-arid Selenga, characterized by discontinuous, sporadic, and isolated permafrost; and the boreal Aldan, which is underlain by continuous permafrost. Our results indicate that the two basins show divergent trends in river runoff over the period 1954-2013. In Selenga, runoff exhibits a significant decreasing trend (-1.3 km(3)/10yrs, p<0.05), whereas a remarkable increasing trend (4.4 km3/10yrs, p<0.05) occurs in Aldan. Given the negligible trends in precipitation over both basins, we attribute these contrasting changes to different impacts from warming-induced permafrost degradation. The Selenga basin, which is dominated by lateral degradation (i.e., decreasing permafrost extent), suffers from severe water loss via the enhanced infiltration of water that was previously stored close to the surface. This leads to a water-deficit surface condition. In the Aldan basin, in contrast, vertical degradation prevails: the thickened active layer is still underlain by a frozen layer with low permeability that sustains water rich surface conditions. Furthermore, summer runoff shows contrasting oscillations, with wet-dry-wet-dry and dry-wet-dry-wet state evolutions in the Selenga and Aldan basins, respectively. We attribute such variabilities to the seesaw-like oscillations in summer precipitation associated with the propagation of Rossby wave trains across the Eurasian continent. We also find that warming-induced permafrost degradation over the 30-year period from 1984 to 2013 has led to strong regime shifts in river runoff in both basins. Our study highlights the importance of examining the mechanisms that drive changes in water availability from an integrated land hydrology-atmosphere system perspective.
英文关键词	Siberia Water availability Permafrost degradation Climate change
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000751951900001
WOS关键词	CLIMATE-CHANGE ; WATER-BALANCE ; DISCONTINUOUS PERMAFROST ; CENTRAL YAKUTIA ; RIVER-BASIN ; EVAPOTRANSPIRATION ; FLOW ; PRECIPITATION ; STREAMFLOW ; EVOLUTION
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/376899
作者单位	[Han, Li; Menzel, Lucas] Heidelberg Univ, Dept Geog, Hydrol & Climatol, D-69120 Heidelberg, Germany
推荐引用方式 GB/T 7714	Han, Li,Menzel, Lucas. Hydrological variability in southern Siberia and the role of permafrost degradation[J],2022,604.
APA	Han, Li,&Menzel, Lucas.(2022).Hydrological variability in southern Siberia and the role of permafrost degradation.JOURNAL OF HYDROLOGY,604.
MLA	Han, Li,et al."Hydrological variability in southern Siberia and the role of permafrost degradation".JOURNAL OF HYDROLOGY 604(2022).