Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 45, Issue 9, Pages 4086-4095Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL076652
Keywords
Ice Shelves; Satellite Altimetry; Mass Balance; Climate variability; Antarctic Peninsula
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Funding
- NASA [NNX17AI03G, NNX13AP60G, NNX17AG63G]
- George Thompson Fellowship at Stanford University
- NWO-ALW Veni grant [863.15.023]
- NASA [NNX13AP60G, 466837] Funding Source: Federal RePORTER
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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.
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