Observations of surface mass balance on Pine Island Glacier, West Antarctica, and the effect of strain history in fast-flowing sections
Observations of surface mass balance on Pine Island Glacier, West Antarctica, and the effect of strain history in fast-flowing sections
复制标题
南极洲西部松岛冰川表面质量平衡观测以及快速流动剖面中应变历史的影响
DOI:
10.1017/jog.2019.36
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发表时间:
2019
影响因子:
3.4
通讯作者:
KONRAD H
中科院分区:
文献类型:
--
作者:
KONRAD H
Surface mass balance (SMB) is the net input of mass on a glacier's upper surface, composed of snow deposition, melt and erosion processes, and is a major contributor to the overall mass balance. Pine Island Glacier (PIG) in West Antarctica has been dynamically imbalanced since the early 1990s, indicating that discharge of solid ice into the oceans exceeds snow deposition. However, observations of the SMB pattern on the fast flowing regions are scarce, and are potentially affected by the firn's strain history. Here, we present new observations from radar-derived stratigraphy and a relatively dense network of firn cores, collected along a ~900 km traverse of PIG. Between 1986 and 2014, the SMB along the traverse was 0.505 m w.e. a−1 on average with a gradient of higher snow deposition in the South-West compared with the North-East of the catchment. We show that along ~80% of the traverse the strain history amounts to a misestimation of SMB below the nominal uncertainty, but can exceed it by a factor 5 in places, making it a significant correction to the SMB estimate locally. We find that the strain correction changes the basin-wide SMB by ~0.7 Gt a−1 and thus forms a negligible (1%) correction to the glacier's total SMB.
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影响因子:
2.9
作者:
Lenaerts J
通讯作者:
Lenaerts J
影响因子:
5.2
作者:
Howat, Ian M.;de la Pena, Santiago;Womack, Gary
通讯作者:
Womack, Gary
影响因子:
2.9
作者:
A. Sigg;A. Neftel
通讯作者:
A. Neftel
DOI:
--
发表时间:
2015
期刊:
影响因子:
--
作者:
S. Colwell;L. Keller;Lazzara;A. Setzer;R. Fogt
通讯作者:
R. Fogt
影响因子:
2.9
作者:
V. B. Spikes;G. Hamilton;S. Arcone;S. Kaspari;P. Mayewski
通讯作者:
P. Mayewski