Brief communication: Impact of common ice mask in surface mass balance estimates over the Antarctic ice sheet
Hansen, N.; Simonsen, S.B.; Boberg, F.; Kittel, C.; Orr, A.; Souverijns, N.; Van Wessem, J.M.; Mottram, R. (2022). Brief communication: Impact of common ice mask in surface mass balance estimates over the Antarctic ice sheet. Cryosphere 16(2): 711-718. https://dx.doi.org/10.5194/tc-16-711-2022
In: The Cryosphere. Copernicus: Göttingen. ISSN 1994-0416; e-ISSN 1994-0424
Regional climate models compute ice sheet surface mass balance (SMB) over a mask that defines the area covered by glacier ice, but ice masks have not been harmonised between models. Intercomparison studies of modelled SMB therefore use a common ice mask. The SMB in areas outside the common ice mask, which are typically coastal and high-precipitation regions, is discarded. Ice mask differences change integrated SMB by between 40.5 and 140.6?Gt?yr-1 (1.8?% to 6.0?% of ensemble mean SMB), equivalent to the entire Antarctic mass imbalance. We conclude there is a pressing need for a common ice mask protocol.
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