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Surface Mass Balance Controlled by Local Surface Slope in Inland Antarctica: Implications for Ice-Sheet Mass Balance and Oldest Ice Delineation in Dome Fuji

par Van Liefferinge, Brice ;Taylor, Drew;Tsutaki, Shun;Fujita, Shuji;Gogineni, Prasad;Kawamura, Kenji;Matsuoka, Kenichi;Moholdt, Geir;Oyabu, Ikumi;Abe-Ouchi, Ayako;Awasthi, Abhishek;Buizert, Christo;Gallet, Jean‐Charles;Isaksson, Elisabeth;Motoyama, Hideaki;Nakazawa, Fumio;Ohno, Hiroshi;O’Neill, Charles;Pattyn, Frank ;Sugiura, Konosuke
Référence Geophysical research letters, 48, 24, e2021GL094966
Publication Publié, 2021-12

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Résumé :

The limited number of surface mass balance (SMB) observations in the Antarctic inland hampers estimates of ice-sheet contribution to global sea level and locations with million-year-old ice. We present finely resolved SMB over the past three centuries in a low-accumulation region with significant depth hoar formation on Dome Fuji derived from ∼1,100 km of microwave radar stratigraphy dated with a firn core. The regional-mean SMB over the past 264 years is estimated to ∼22.5 ± 3.3 kg m−2 a−1, but with large local variability of up to 30%. We found that local SMB is negatively correlated with surface slope at scales of a few hundred meters, resulting in anomalous zones of low SMB which represent as much as 8–10% of the total SMB on the inland plateau if the SMB-slope relationship is more widely valid. This impact should be investigated further to improve estimates of Antarctic mass balance and sea-level contribution.