Elevation changes in Antarctica mainly determined by accumulation variability

被引：118
作者：
Helsen, Michiel M. [1 ]
van den Broeke, Michiel R. [1 ]
van de Wal, Roderik S. W. [1 ]
van de Berg, Willem Jan [1 ]
van Meijgaard, Erik [2 ]
Davis, Curt H. [3 ]
Li, Yonghong [3 ]
Goodwin, Ian [4 ]
机构：
[1] Univ Utrecht, Inst Marine & Atmospher Res, NL-3584 CC Utrecht, Netherlands
[2] Royal Netherlands Meteorol Inst, NL-3732 GK De Bilt, Netherlands
[3] Univ Missouri, Dept Elect & Comp Engn, Columbia, MO 65211 USA
[4] Univ Newcastle, Sch Environm & Life Sci, Callaghan, NSW 2308, Australia
来源：
SCIENCE | 2008年 / 320卷 / 5883期
关键词：
D O I：
10.1126/science.1153894
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Antarctic Ice Sheet elevation changes, which are used to estimate changes in the mass of the interior regions, are caused by variations in the depth of the firn layer. We quantified the effects of temperature and accumulation variability on firn layer thickness by simulating the 1980- 2004 Antarctic firn depth variability. For most of Antarctica, the magnitudes of firn depth changes were comparable to those of observed ice sheet elevation changes. The current satellite observational period (similar to 15 years) is too short to neglect these fluctuations in firn depth when computing recent ice sheet mass changes. The amount of surface lowering in the Amundsen Sea Embayment revealed by satellite radar altimetry ( 1995- 2003) was increased by including firn depth fluctuations, while a large area of the East Antarctic Ice Sheet slowly grew as a result of increased accumulation.
引用
收藏
页码：1626 / 1629
页数：4
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