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DOI | 10.1073/pnas.2015483118 |
Ocean melting of the Zachariae Isstrøm and nioghalvfjerdsfjorden glaciers, northeast Greenland | |
An L.; Rignot E.; Wood M.; Willis J.K.; Mouginot J.; Khan S.A. | |
发表日期 | 2021 |
ISSN | 00278424 |
卷号 | 118期号:2 |
英文摘要 | Zachariae Isstrøm (ZI) and Nioghalvfjerdsfjorden (79N) are marine-terminating glaciers in northeast Greenland that hold an ice volume equivalent to a 1.1-m global sea level rise. ZI lost its floating ice shelf, sped up, retreated at 650 m/y, and experienced a 5-gigaton/y mass loss. Glacier 79N has been more stable despite its exposure to the same climate forcing. We analyze the impact of ocean thermal forcing on the glaciers. A three-dimensional inversion of airborne gravity data reveals an 800-m-deep, broad channel that allows subsurface, warm, Atlantic Intermediate Water (AIW) (+1.25◦C) to reach the front of ZI via two sills at 350-m depth. Subsurface ocean temperature in that channel has warmed by 1.3±0.5◦C since 1979. Using an ocean model, we calculate a rate of ice removal at the grounding line by the ocean that increased from 108 m/y to 185 m/y in 1979-2019. Observed ice thinning caused a retreat of its flotation line to increase from 105 m/y to 217 m/y, for a combined grounding line retreat of 13 km in 41 y that matches independent observations within 14%. In contrast, the limited access of AIW to 79N via a narrower passage yields lower grounded ice removal (53 m/y to 99 m/y) and thinning-induced retreat (27 m/y to 50 m/y) for a combined retreat of 4.4 km, also within 12% of observations. Ocean-induced removal of ice at the grounding line, modulated by bathymetric barriers, is therefore a main driver of ice sheet retreat, but it is not incorporated in most ice sheet models. © This open access article is distributed under Creative Commons Attribution-NonCommercialNoDerivatives License 4.0 (CC BY-NC-ND). |
英文关键词 | Climate; Glaciology; Greenland; Ice-ocean interaction; Sea level |
语种 | 英语 |
scopus关键词 | Article; Atlantic Ocean; climate change; conductance; deglaciation; environmental impact; environmental protection; flotation; Greenland; heat loss; ice sheet; measurement accuracy; ocean current; priority journal; salinity; satellite imagery; seasonal variation; snowmelt runoff; steady state; summer; water temperature; winter |
来源期刊 | Proceedings of the National Academy of Sciences of the United States of America |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/181081 |
作者单位 | Department of Earth System Science, University of California, Irvine, CA 92617, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, United States; Department of Civil and Environmental Engineering, University of California, Irvine, CA 92617, United States; University of Grenoble Alpes, CNRS, Institut de Recherche pour le Développement, Grenoble Institute of Engineering, Institute of Environmental Geosciences, Grenoble, 38031, France; National Space Institute, Geodesy and Earth Observation, Technical University of Denmark, Lyngby, 2800, Denmark |
推荐引用方式 GB/T 7714 | An L.,Rignot E.,Wood M.,et al. Ocean melting of the Zachariae Isstrøm and nioghalvfjerdsfjorden glaciers, northeast Greenland[J],2021,118(2). |
APA | An L.,Rignot E.,Wood M.,Willis J.K.,Mouginot J.,&Khan S.A..(2021).Ocean melting of the Zachariae Isstrøm and nioghalvfjerdsfjorden glaciers, northeast Greenland.Proceedings of the National Academy of Sciences of the United States of America,118(2). |
MLA | An L.,et al."Ocean melting of the Zachariae Isstrøm and nioghalvfjerdsfjorden glaciers, northeast Greenland".Proceedings of the National Academy of Sciences of the United States of America 118.2(2021). |
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