A century of variation in the dependence of Greenland iceberg calving on ice sheet surface mass balance and regional climate change.
A century of variation in the dependence of Greenland iceberg calving on ice sheet surface mass balance and regional climate change.
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DOI：
10.1098/rspa.2013.0662
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发表时间：
2014-06-08
期刊：
影响因子：
--
通讯作者：
Kadirkamanathan V
中科院分区：
文献类型：
--
作者：
Bigg GR;Wei HL;Wilton DJ;Zhao Y;Billings SA;Hanna E;Kadirkamanathan V
冰山崩解是格陵兰冰盖总质量平衡的主要组成部分。格陵兰岛长达一个世纪的冰山记录来自国际冰巡逻队的冰山记录（I48 N）通过北纬48°，纽芬兰岛。I48 N具有很强的年际变化，近几十年来振幅显著增加。在这项研究中，我们表明，通过非线性系统识别和耦合海洋冰山建模相结合，I48 N的变化主要是由波动引起的GrIS产犊流量，而不是开放的海洋冰山融化。我们还表明，情节变化冰山放电是密切相关的非线性组合的最近变化的表面质量平衡（SMB）的GrIS和区域大气和海洋气候变率，在过去的1-3年的规模，与冰川（SMB）和气候（海洋温度）之间的主要因果机制随着时间的推移。我们认为，这是一个变化，无论是冰川径流或冰下融化是占主导地位的，分别。我们还认为，GrIS产犊放电是情节上至少在一个区域范围内，最近一直在显着增加，主要是由于西格陵兰岛的来源。
Iceberg calving is a major component of the total mass balance of the Greenland ice sheet (GrIS). A century-long record of Greenland icebergs comes from the International Ice Patrol's record of icebergs (I48N) passing latitude 48° N, off Newfoundland. I48N exhibits strong interannual variability, with a significant increase in amplitude over recent decades. In this study, we show, through a combination of nonlinear system identification and coupled ocean–iceberg modelling, that I48N's variability is predominantly caused by fluctuation in GrIS calving discharge rather than open ocean iceberg melting. We also demonstrate that the episodic variation in iceberg discharge is strongly linked to a nonlinear combination of recent changes in the surface mass balance (SMB) of the GrIS and regional atmospheric and oceanic climate variability, on the scale of the previous 1–3 years, with the dominant causal mechanism shifting between glaciological (SMB) and climatic (ocean temperature) over time. We suggest that this is a change in whether glacial run-off or under-ice melting is dominant, respectively. We also suggest that GrIS calving discharge is episodic on at least a regional scale and has recently been increasing significantly, largely as a result of west Greenland sources.
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影响因子：
2.1
作者：
CHEN, S;BILLINGS, SA
通讯作者：
BILLINGS, SA
影响因子：
3.6
作者：
Kaplan, A;Cane, MA;Rajagopalan, B
通讯作者：
Rajagopalan, B
影响因子：
5.2
作者：
Green, Clare L.;Bigg, Grant R.;Green, J. A. Mattias
通讯作者：
Green, J. A. Mattias
DOI：
10.3189/172756400781819941
发表时间：
2000-01-01
期刊：
ANNALS OF GLACIOLOGY, VOL 31, 2000
影响因子：
--
作者：
Janssens, I;Huybrechts, P
通讯作者：
Huybrechts, P
影响因子：
4.1
作者：
Bigg, GR;Wadley, MR;Johnson, JA
通讯作者：
Johnson, JA