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Accumulation patterns around Dome C, East Antarctica, in the last 73 kyr

par Cavitte, Marie M.G.P.;Parrenin, Frédéric;Ritz, Catherine;Young, A.;Van Liefferinge, Brice ;Blankenship, Donald;Frezzotti, Massimo;Roberts, Jason J.L.
Référence The Cryosphere, 12, 4, page (1401-1414)
Publication Publié, 2018-04

Article révisé par les pairs

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Résumé :

We reconstruct the pattern of surface accumulation in the region around Dome C, East Antarctica, since the last glacial. We use a set of 18 isochrones spanning all observable depths of the ice column, interpreted from various ice-penetrating radar surveys and a 1-D ice flow model to invert for accumulation rates in the region. The shallowest four isochrones are then used to calculate paleoaccumulation rates between isochrone pairs using a 1-D assumption where horizontal advection is negligible in the time interval of each layer. We observe that the large-scale (100sĝ€km) surface accumulation gradient is spatially stable through the last 73ĝ€kyr, which reflects current modeled and observed precipitation gradients in the region. We also observe small-scale (10ĝ€sĝ€km) accumulation variations linked to snow redistribution at the surface, due to changes in its slope and curvature in the prevailing wind direction that remain spatially stationary since the last glacial.