Sediment plumes as a proxy for local ice-sheet runoff in Kangerlussuaq Fjord, West Greenland
Sediment plumes as a proxy for local ice-sheet runoff in Kangerlussuaq Fjord, West Greenland
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沉积物羽流作为西格陵兰康克鲁斯瓦克峡湾当地冰盖径流的代表
DOI：
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发表时间：
2010
影响因子：
3.4
通讯作者：
M. R. van den Broeke
中科院分区：
文献类型：
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作者：
D. McGrath;K. Steffen;I. Overeem;S. Mernild;B. Hasholt;M. R. van den Broeke
摘要融水径流是格陵兰冰盖物质平衡的重要组成部分，是海平面上升的重要原因。由于后勤方面的困难，对10325个出口的河流径流量进行现场测量是不存在的。我们开发了一种新的方法，使用卫星观测的沉积物羽流作为代理的发病，持续时间和量的融水径流从一个盆地的GrIS。沉积物羽流整合了许多约束不佳的过程，包括融水再冻结和冰上和冰内水储存，并由离开GrIS并进入海洋的融水形成。在2001年至2008年融化季节的中分辨率成像光谱仪（MODIS，波段1，250米）卫星图像测量的烟羽特征。格陵兰西部Kangerlussuaq峡湾的羽流形成和停止与Kangerlussuaq断面自动气象站S5（490 ma.s.l.，距冰缘6公里）。烟羽长度与2007年和2008年融化季节观察到的4天平均沃森河流量呈正相关（r 2 = 0.52，n = 35，p < 0.05）。烟羽长度是用来推断瞬时和年累积沃森河流量在2001年和2008年之间。重建的累积排放值高估了2007年和2008年观测到的累积排放值分别为15%和29%。
Abstract Meltwater runoff is an important component of the mass balance of the Greenland ice sheet (GrIS) and contributes to eustatic sea-level rise. In situ measurements of river runoff at the ˜325 outlets are nonexistent due to logistical difficulties. We develop a novel methodology using satellite observations of sediment plumes as a proxy for the onset, duration and volume of meltwater runoff from a basin of the GrIS. Sediment plumes integrate numerous poorly constrained processes, including meltwater refreezing and supra- and englacial water storage, and are formed by meltwater that exits the GrIS and enters the ocean. Plume characteristics are measured in Moderate Resolution Imaging Spectroradiometer (MODIS, band 1, 250 m) satellite imagery during the 2001-08 melt seasons. Plume formation and cessation in Kangerlussuaq Fjord, West Greenland, are positively correlated (r 2 = 0.88, n = 5, p < 0.05; r 2 = 0.93, n = 5, p < 0.05) with ablation onset and cessation at the Kangerlussuaq Transect automatic weather station S5 (490 ma.s.l., 6 km from the ice margin). Plume length is positively correlated (r 2 = 0.52, n = 35, p < 0.05) with observed 4 day mean Watson River discharge throughout the 2007 and 2008 melt seasons. Plume length is used to infer instantaneous and annual cumulative Watson River discharge between 2001 and 2008. Reconstructed cumulative discharge values overestimate observed cumulative discharge values for 2007 and 2008 by 15% and 29%, respectively.
影响因子：
5.2
作者：
A. Shepherd;A. Hubbard;P. Nienow;Matt A. King;M. McMillan;I. Joughin
通讯作者：
A. Shepherd;A. Hubbard;P. Nienow;Matt A. King;M. McMillan;I. Joughin
影响因子：
18.3
作者：
Bartholomew, Ian;Nienow, Peter;Sole, Andrew
通讯作者：
Sole, Andrew