气候变化领域集成服务门户(CCPortal): Sedimentary basins reduce stability of Antarctic ice streams through groundwater feedbacks

CCPortal

DOI	10.1038/s41561-022-00992-5
	Sedimentary basins reduce stability of Antarctic ice streams through groundwater feedbacks
	Li, Lu; Aitken, Alan R. A.; Lindsay, Mark D.; Kulessa, Bernd
发表日期	2022
ISSN	1752-0894
EISSN	1752-0908
起始页码	645
结束页码	+
卷号	15 期号:8 页码:9
英文摘要	A machine-learning-based mapping of Antarctic subglacial geology suggests sedimentary basins lie beneath some of the most dynamic ice streams, increasing their vulnerability to rapid ice retreat. Antarctica preserves Earth's largest ice-sheet, which in response to climate warming, may lose ice mass and raise sea level by several metres. The ice-sheet bed exerts critical controls on dynamic mass loss through feedbacks between water and heat fluxes, topographic forcing, till deformation and basal sliding. Here we show that sedimentary basins may amplify critical feedbacks that are known to impact ice-sheet retreat dynamics. We create a high-resolution subglacial geology classification for Antarctica by applying a supervised machine-learning method to geophysical data, revealing the distribution of sedimentary basins. Hydro-mechanical numerical modelling demonstrates that during glacial retreat, where sedimentary basins exist, the groundwater discharge rate scales with the rate of ice unloading. Antarctica's most dynamic ice streams, including Thwaites and Pine Island glaciers, possess sedimentary basins in their upper catchments. Enhanced groundwater discharge and its associated feedbacks are likely to amplify basal sliding and increase the vulnerability of these catchments to rapid ice retreat and enhanced dynamic mass loss.
学科领域	Geosciences, Multidisciplinary
语种	英语
WOS研究方向	Geology
WOS记录号	WOS:000832487600002
来源期刊	NATURE GEOSCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/272462
作者单位	University of Western Australia; University of Western Australia; Commonwealth Scientific & Industrial Research Organisation (CSIRO); Swansea University; University of Tasmania
推荐引用方式 GB/T 7714	Li, Lu,Aitken, Alan R. A.,Lindsay, Mark D.,et al. Sedimentary basins reduce stability of Antarctic ice streams through groundwater feedbacks[J],2022,15(8):9.
APA	Li, Lu,Aitken, Alan R. A.,Lindsay, Mark D.,&Kulessa, Bernd.(2022).Sedimentary basins reduce stability of Antarctic ice streams through groundwater feedbacks.NATURE GEOSCIENCE,15(8),9.
MLA	Li, Lu,et al."Sedimentary basins reduce stability of Antarctic ice streams through groundwater feedbacks".NATURE GEOSCIENCE 15.8(2022):9.