气候变化领域集成服务门户(CCPortal): Ross Ice Shelf response to climate driven by the tectonic imprint on seafloor bathymetry

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DOI	10.1038/s41561-019-0370-2
	Ross Ice Shelf response to climate driven by the tectonic imprint on seafloor bathymetry
	Tinto K.J.; Padman L.; Siddoway C.S.; Springer S.R.; Fricker H.A.; Das I.; Caratori Tontini F.; Porter D.F.; Frearson N.P.; Howard S.L.; Siegfried M.R.; Mosbeux C.; Becker M.K.; Bertinato C.; Boghosian A.; Brady N.; Burton B.L.; Chu W.; Cordero S.I.; Dhakal T.; Dong L.; Gustafson C.D.; Keeshin S.; Locke C.; Lockett A.; O’Brien G.; Spergel J.J.; Starke S.E.; Tankersley M.; Wearing M.G.; Bell R.E.
发表日期	2019
ISSN	17520894
卷号	12 期号:6
英文摘要	Ocean melting has thinned Antarctica’s ice shelves at an increasing rate over the past two decades, leading to loss of grounded ice. The Ross Ice Shelf is currently close to steady state but geological records indicate that it can disintegrate rapidly, which would accelerate grounded ice loss from catchments equivalent to 11.6 m of global sea level rise. Here, we use data from the ROSETTA-Ice airborne survey and ocean simulations to identify the principal threats to Ross Ice Shelf stability. We locate the tectonic boundary between East and West Antarctica from magnetic anomalies and use gravity data to generate a new high-resolution map of sub-ice-shelf bathymetry. The tectonic imprint on the bathymetry constrains sub-ice-shelf ocean circulation, protecting the ice shelf grounding line from moderate changes in global ocean heat content. In contrast, local, seasonal production of warm upper-ocean water near the ice front drives rapid ice shelf melting east of Ross Island, where thinning would lead to faster grounded ice loss from both the East and West Antarctic ice sheets. We confirm high modelled melt rates in this region using ROSETTA-Ice radar data. Our findings highlight the significance of both the tectonic framework and local ocean–atmosphere exchange processes near the ice front in determining the future of the Antarctic Ice Sheet. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	airborne survey; bathymetry; global ocean; grounding line; ice shelf; melting; radar; sea level change; seafloor; seasonality; snowmelt; Antarctic Ice Sheet; Antarctica; East Antarctica; Ross Ice Shelf; Ross Island; West Antarctica
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/124650
作者单位	Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Earth & Space Research, Corvallis, OR, United States; Colorado College, Colorado Springs, CO, United States; Earth & Space Research, Seattle, WA, United States; Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States; GNS Science, Lower Hutt, New Zealand; Colorado School of Mines, Golden, CO, United States; Dynamic Gravity Systems, Broomfield, CO, United States; U. S. Geological Survey, Denver, CO, United States; Stanford University, Stanford, CA, United States
推荐引用方式 GB/T 7714	Tinto K.J.,Padman L.,Siddoway C.S.,et al. Ross Ice Shelf response to climate driven by the tectonic imprint on seafloor bathymetry[J],2019,12(6).
APA	Tinto K.J..,Padman L..,Siddoway C.S..,Springer S.R..,Fricker H.A..,...&Bell R.E..(2019).Ross Ice Shelf response to climate driven by the tectonic imprint on seafloor bathymetry.Nature Geoscience,12(6).
MLA	Tinto K.J.,et al."Ross Ice Shelf response to climate driven by the tectonic imprint on seafloor bathymetry".Nature Geoscience 12.6(2019).