Ice Sheet Elevation Change in West Antarctica From Ka-Band Satellite Radar Altimetry

Otosaka, Ines and Shepherd, Andrew and McMillan, Malcolm (2019) Ice Sheet Elevation Change in West Antarctica From Ka-Band Satellite Radar Altimetry. Geophysical Research Letters, 46 (22). pp. 13135-13143. ISSN 0094-8276

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Abstract

Satellite altimetry has been used to track changes in ice sheet elevation using a series of Ku‐band radars in orbit since the late 1970s. Here, we produce an assessment of higher‐frequency Ka‐band satellite radar altimetry for the same purpose, using SARAL/AltiKa measurements recorded over West Antarctica. AltiKa elevations are 3.8 ± 0.5 and 2.5 ± 0.1 m higher than those determined from airborne laser altimetry and CryoSat‐2, respectively, likely due to the instruments' coarser footprint in the sloping coastal margins. However, AltiKa rates of elevation change computed between 2013 and 2019 are within 0.6 ± 2.4 and 0.1 ± 0.1 cm/year of airborne laser and CryoSat‐2, respectively, indicating that trends in radar penetration are negligible. The fast‐flowing trunks of the Pine Island and Thwaites Glaciers thinned by 117 ± 10 and 100 ± 20 cm/year, respectively, amounting to a 9% reduction and a 43% increase relative to the 2000s.

Item Type:
Journal Article
Journal or Publication Title:
Geophysical Research Letters
Additional Information:
An edited version of this paper was published by AGU. Copyright 2019 American Geophysical Union. Otosaka, I., Shepherd, A., & McMillan, M. ( 2019). Ice Sheet Elevation Change in West Antarctica From Ka‐Band Satellite Radar Altimetry. Geophysical Research Letters, 46, 13135– 13143. https://doi.org/10.1029/2019GL084271 To view the published open abstract, go to http://dx.doi.org and enter the DOI.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900
Subjects:
ID Code:
139622
Deposited By:
Deposited On:
06 Jan 2020 09:35
Refereed?:
Yes
Published?:
Published
Last Modified:
25 Oct 2020 06:50