气候变化领域集成服务门户(CCPortal): Crevasse refreezing and signatures of retreat observed at Kamb Ice Stream grounding zone

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DOI	10.1038/s41561-023-01129-y
	Crevasse refreezing and signatures of retreat observed at Kamb Ice Stream grounding zone
	Lawrence, J. D.; Washam, P. M.; Stevens, C.; Hulbe, C.; Horgan, H. J.; Dunbar, G.; Calkin, T.; Stewart, C.; Robinson, N.; Mullen, A. D.; Meister, M. R.; Hurwitz, B. C.; Quartini, E.; Dichek, D. J. G.; Spears, A.; Schmidt, B. E.
发表日期	2023
ISSN	1752-0894
EISSN	1752-0908
起始页码	238
结束页码	+
卷号	16 期号:3 页码:17
英文摘要	Observations from a remotely operated underwater vehicle reveal crevasse refreezing and the fine-scale variability in ice and ocean structure at the Kamb Ice Stream grounding line in West Antarctica. Ice streams flowing into Ross Ice Shelf are presently responsible for around 10% of the mass flux from West Antarctica, with the noteworthy exception of Kamb Ice Stream, which stagnated in the late 1800s. The subsequent reduction in ice supply led to grounding-line retreat at the coastal margin where Kamb transitions into the floating Ross Ice Shelf. Grounding-line migration is linked to broader changes in ice-sheet mass balance and sea level, but our understanding of related ice, ocean and seafloor interactions is limited by the difficulty in accessing these remote regions. Here we report in situ observations from an underwater vehicle deployed at Kamb that show how fine-scale variability in ice and ocean structure combine to influence a diversity of ice-ocean interactions. We found a stratified water column within a tenth of a degree of freezing at the ice base and mapped basal crevasses with supercooled water and active marine ice formation. At the seafloor, we interpret parallel ridges as crevasse impressions left as the ice lifted off during grounding-line retreat. These observations from a recently ungrounded sub-shelf environment illuminate both the geomorphological signatures of past grounding-line retreat and the fine-scale sensitivity of ongoing ice-ocean interactions to ice topography.
学科领域	Geosciences, Multidisciplinary
语种	英语
WOS研究方向	Geology
WOS记录号	WOS:000942760500003
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/272620
作者单位	University System of Georgia; Georgia Institute of Technology; Cornell University; Cornell University; National Institute of Water & Atmospheric Research (NIWA) - New Zealand; University of Auckland; University of Otago; Victoria University Wellington
推荐引用方式 GB/T 7714	Lawrence, J. D.,Washam, P. M.,Stevens, C.,et al. Crevasse refreezing and signatures of retreat observed at Kamb Ice Stream grounding zone[J],2023,16(3):17.
APA	Lawrence, J. D..,Washam, P. M..,Stevens, C..,Hulbe, C..,Horgan, H. J..,...&Schmidt, B. E..(2023).Crevasse refreezing and signatures of retreat observed at Kamb Ice Stream grounding zone.NATURE GEOSCIENCE,16(3),17.
MLA	Lawrence, J. D.,et al."Crevasse refreezing and signatures of retreat observed at Kamb Ice Stream grounding zone".NATURE GEOSCIENCE 16.3(2023):17.