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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

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VLIZ: Open access 378033 [ download pdf ]

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Hansen, N. Simonsen, S.B. Boberg, F. Kittel, C.	Orr, A. Souverijns, N. Van Wessem, J.M. Mottram, R.

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Abstract

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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