Ice-shelf elevation changes due to atmospheric pressure variations

被引：53

作者：

Padman, L

King, M

Goring, D

Corr, H

Coleman, R

机构：

[1] Earth & Space Res, Corvallis, OR 97333 USA

[2] Newcastle Univ, Sch Civil Engn & Geosci, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England

[3] Natl Inst Water & Atmospher Res Ltd, Christchurch, New Zealand

[4] British Antarctic Survey, NERC, Cambridge CB3 0ET, England

[5] Univ Tasmania, Sch Geog & Environm Studies, Hobart, Tas 7001, Australia

[6] CSIRO, Hobart, Tas 7001, Australia

[7] Univ Tasmania, Antarctic CRC, Hobart, Tas 7001, Australia

来源：

JOURNAL OF GLACIOLOGY | 2003年 / 49卷 / 167期

关键词：

D O I：

10.3189/172756503781830386

中图分类号：

P9 [自然地理学];

学科分类号：

0705 ; 070501 ;

摘要：

The inverse barometer effect (IBE) is the isostatic response of ocean surface helght to changes in atmospheric pressure (P-air) at a rate of about 1 cm hPa(-1). The IBE is a significant contributor to variability of ice-shelf surface elevation (eta(icc)), as we demonstrate with simultaneous global positioning system measurements of eta(ice) and local measurements of P-air from the Amery, Brunt and Ross Ice Shelves, Antarctica. We find that all IBE correction is justified for frequencies (w) covering the "weather hand", 0.03 < w < 0.5 cpd (cycles per day). The IBE correction reduces the standard deviation of the weather-band signal of eta(ice) from similar to9 cm to similar to3 cm. With this correction, the largest remaining high-frequency error signal in eta(ice) is the inaccuracy of the present generation of Antarctic tide models, estimated to be of order 10 cm for most of Antarctica.

引用

页码：521 / 526

页数：6