气候变化领域集成服务门户(CCPortal): Development of ice-shelf estuaries promotes fractures and calving

CCPortal

DOI	10.1038/s41561-021-00837-7
	Development of ice-shelf estuaries promotes fractures and calving
	Boghosian A.L.; Pitcher L.H.; Smith L.C.; Kosh E.; Alexander P.M.; Tedesco M.; Bell R.E.
发表日期	2021
ISSN	1752-0894
卷号	14 期号:12
英文摘要	As the global climate warms, increased surface meltwater production on ice shelves may trigger ice-shelf collapse and enhance global sea-level rise. The formation of surface rivers could help prevent ice-shelf collapse if they can efficiently evacuate meltwater. Here we present observations of the evolution of a surface river into an ice-shelf estuary atop the Petermann Ice Shelf in northwest Greenland and identify a second estuary at the nearby Ryder Ice Shelf. This surface-hydrology process can foster fracturing and enhance calving. At the Petermann estuary, sea ice was observed converging at the river mouth upstream, indicating a flow reversal. Seawater persists in the estuary after the surrounding icescape is frozen. Along the base of Petermann estuary, linear fractures were initiated at the calving front and propagated upstream along the channel. Similar fractures along estuary channels shaped past large rectilinear calving events at the Petermann and Ryder ice shelves. Increased surface melting in a warming world will enhance fluvial incision, promoting estuary development and longitudinal fracturing orthogonal to ice-shelf fronts, and increase rectilinear calving. Estuaries could develop in Antarctica within the next half-century, resulting in increased calving and accelerating both ice loss and global sea-level rise. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	collapse; estuary; global climate; ice shelf; meltwater; sea ice; sea level change; Antarctica; Arctic; Greenland
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/250819
作者单位	Lamont–Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Department of Earth and Environmental Sciences, Columbia University, New York, NY, United States; Cooperative Institute for Research in Environmental Science (CIRES), University of Colorado Boulder, Boulder, CO, United States; Institute at Brown for Environment and Society, Brown University, Providence, RI, United States; Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI, United States; Environmental Science Department, Barnard College, New York, NY, United States; NASA Goddard Institute for Space Studies, New York, NY, United States; Data Science Institute at Columbia University, New York, NY, United States; Institute of Economics, Scuola Superiore Sant-Anna, Pisa, Italy
推荐引用方式 GB/T 7714	Boghosian A.L.,Pitcher L.H.,Smith L.C.,et al. Development of ice-shelf estuaries promotes fractures and calving[J],2021,14(12).
APA	Boghosian A.L..,Pitcher L.H..,Smith L.C..,Kosh E..,Alexander P.M..,...&Bell R.E..(2021).Development of ice-shelf estuaries promotes fractures and calving.Nature Geoscience,14(12).
MLA	Boghosian A.L.,et al."Development of ice-shelf estuaries promotes fractures and calving".Nature Geoscience 14.12(2021).