Ice thickness of the northern half of the Patagonia Icefields of South America from high-resolution airborne gravity surveys

被引：0
|
作者：
Gourlet P. [1 ]
Rignot E. [1 ,2 ]
Rivera A. [3 ]
Casassa G. [4 ,5 ]
机构：
[1] Department Earth System Science, University of California, Irvine, CA
[2] Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA
[3] Centro Estudios de Cientificos, Valdivia
[4] Geoestudios, San José de Maipo
[5] GAIA-Antártica, Universidad de Magallanes, Punta Arenas
来源：
Geophysical Research Letters | 2016年 / 43卷 / 01期
基金：
美国国家航空航天局;
关键词：
Ice;
D O I：
10.1002/2015GL066728
中图分类号：
学科分类号：
摘要：
We employ high-resolution, high-precision, helicopter-borne gravity observations of the Northern (NPI) and Southern Patagonia Icefields (SPI), South America, to infer ice thickness and bed topography using a three-dimensional model constrained by Fjord and lake bathymetry, and a land-ice mask. The results reveal thicker ice than the reflecting horizon of radar sounders, with 1 km deep ice for Glaciar San Rafael and Colonia (NPI) and 1.5 km deep ice for Glaciar Occidental (SPI). These bedrock troughs channelize fast motion of ice from the plateaus. Combining ice motion and thickness, we calculate balance accumulation levels of 3–6 m/yr water equivalent for the plateaus. Bed elevation remains below sea/lake level 15–20 km inland for Jorge Montt and O’Higgins, which favors retreat, and is at sea level for San Rafael, which halted its retreat. The results demonstrate the utility of airborne gravity surveys for providing critical data on ice volume, bed elevation, and balance accumulation of temperate ice masses. © 2015. American Geophysical Union. All rights reserved.
引用
收藏
页码：241 / 249
页数：8
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