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Ice-shelf elevation changes due to atmospheric pressure variations
journal contribution
posted on 2023-05-16, 16:32 authored by Padman, L, Matt KingMatt King, Goring, D, Corr, H, Richard ColemanRichard ColemanThe inverse barometer effect (IBE) is the isostatic response of ocean surface height to changes in atmospheric pressure (Pair) at a rate of about 1 cm hPa-1. The IBE is a significant contributor to variability of ice-shelf surface elevation (ηice), as we demonstrate with simultaneous global positioning system measurements of ηice and local measurements of Pair from the Amery, Brunt and Ross Ice Shelves, Antarctica. We find that an IBE correction is justified for frequencies (ω) covering the "weather band", 0.03 < ω < 0.5 cpd (cycles per day). The IBE correction reduces the standard deviation of the weather-band signal of ηice from ∼9 cm to ∼3 cm. With this correction, the largest remaining high-frequency error signal in ηice is the inaccuracy of the present generation of Antarctic tide models, estimated to be of order 10 cm for most of Antarctica.
History
Publication title
Journal of GlaciologyVolume
49Issue
167Pagination
521-526ISSN
0022-1430Department/School
School of Geography, Planning and Spatial SciencesPublisher
International Glaciology SocietyPlace of publication
Cambridge, EnglandRepository Status
- Restricted