气候变化领域集成服务门户(CCPortal): Ocean-driven thinning enhances iceberg calving and retreat of Antarctic ice shelves

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DOI	10.1073/pnas.1415137112
	Ocean-driven thinning enhances iceberg calving and retreat of Antarctic ice shelves
	Liu Y.; Moore J.C.; Cheng X.; Gladstone R.M.; Bassis J.N.; Liu H.; Wen J.; Hui F.
发表日期	2015
ISSN	0027-8424
起始页码	3263
结束页码	3268
卷号	112 期号:11
英文摘要	Iceberg calving from all Antarctic ice shelves has never been directly measured, despite playing a crucial role in ice sheet mass balance. Rapid changes to iceberg calving naturally arise from the sporadic detachment of large tabular bergs but can also be triggered by climate forcing. Here we provide a direct empirical estimate of mass loss due to iceberg calving and melting from Antarctic ice shelves. We find that between 2005 and 2011, the total mass loss due to iceberg calving of 755 ± 24 gigatonnes per year (Gt/y) is only half the total loss due to basal melt of 1516 ± 106 Gt/y. However, we observe widespread retreat of ice shelves that are currently thinning. Net mass loss due to iceberg calving for these ice shelves (302 ± 27 Gt/y) is comparable in magnitude to net mass loss due to basal melt (312 ± 14 Gt/y). Moreover, we find that iceberg calving from these decaying ice shelves is dominated by frequent calving events, which are distinct from the less frequent detachment of isolated tabular icebergs associated with ice shelves in neutral or positive mass balance regimes. Our results suggest that thinning associated with ocean-driven increased basal melt can trigger increased iceberg calving, implying that iceberg calving may play an overlooked role in the demise of shrinking ice shelves, and is more sensitive to ocean forcing than expected from steady state calving estimates.
英文关键词	Antarctica; Basal melt; Ice shelf; Iceberg calving; Mass balance
语种	英语
scopus关键词	Antarctica; Article; climate; environmental aspects and related phenomena; ice sheet; ice shelf; iceberg calving; melting point; priority journal; response time; satellite imagery; sea level rise; steady state
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/158913
作者单位	Liu, Y., State Key Laboratory of Remote Sensing Science, College of Global Change and Earth System Science, Beijing Normal University, Beijing, 100875, China, Joint Center for Global Change Studies, Beijing, 100875, China; Moore, J.C., State Key Laboratory of Remote Sensing Science, College of Global Change and Earth System Science, Beijing Normal University, Beijing, 100875, China, Joint Center for Global Change Studies, Beijing, 100875, China, Arctic Centre, University of Lapland, Rovaniemi, 96100, Finland, Department of Earth Sciences, Uppsala University, Uppsala, 75236, Sweden; Cheng, X., State Key Laboratory of Remote Sensing Science, College of Global Change and Earth System Science, Beijing Normal University, Beijing, 100875, China, Joint Center for Global Change Studies, Beijing, 100875, China; Gladstone, R.M., Antarctic Climate and Ecosystems Cooperative Research Centre, University of Tasmania, Hobart, TAS, Australia, Versuchsanstalt für Wasserbau, Hydrologie und Glaziologie, Eidgenössische Techn...
推荐引用方式 GB/T 7714	Liu Y.,Moore J.C.,Cheng X.,et al. Ocean-driven thinning enhances iceberg calving and retreat of Antarctic ice shelves[J],2015,112(11).
APA	Liu Y..,Moore J.C..,Cheng X..,Gladstone R.M..,Bassis J.N..,...&Hui F..(2015).Ocean-driven thinning enhances iceberg calving and retreat of Antarctic ice shelves.Proceedings of the National Academy of Sciences of the United States of America,112(11).
MLA	Liu Y.,et al."Ocean-driven thinning enhances iceberg calving and retreat of Antarctic ice shelves".Proceedings of the National Academy of Sciences of the United States of America 112.11(2015).