Variable basal melt rates of Antarctic Peninsula ice shelves, 1994-2016

TitleVariable basal melt rates of Antarctic Peninsula ice shelves, 1994-2016
Publication TypeJournal Article
Year of Publication2018
AuthorsAdusumilli S., Fricker H.A, Siegfried M.R, Padman L., Paolo F.S, Ligtenberg SRM
JournalGeophysical Research Letters
Volume45
Pagination4086-4095
Date Published2018/05
Type of ArticleArticle
ISBN Number0094-8276
Accession NumberWOS:000434111700038
Keywordsaltimetry; Antarctic Peninsula; circumpolar deep-water; Climate variability; driven; flow; Geology; ice shelves; land; mass balance; satellite altimetry; sensitivity; surface mass-balance; variability
Abstract

We have constructed 23-year (1994-2016) time series of Antarctic Peninsula (AP) ice-shelf height change using data from four satellite radar altimeters (ERS-1, ERS-2, Envisat, and CryoSat-2). Combining these time series with output from atmospheric and firn models, we partitioned the total height-change signal into contributions from varying surface mass balance, firn state, ice dynamics, and basal mass balance. On the Bellingshausen coast of the AP, ice shelves lost 84 +/- 34Gt a(-1) to basal melting, compared to contributions of 50 +/- 7 Gt a(-1) from surface mass balance and ice dynamics. Net basal melting on the Weddell coast was 51 +/- 71 Gt a(-1). Recent changes in ice-shelf height include increases over major AP ice shelves driven by changes in firn state. Basal melt rates near Bawden Ice Rise, a major pinning point of Larsen C Ice Shelf, showed large increases, potentially leading to substantial loss of buttressing if sustained.

DOI10.1002/2017gl076652
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