TY - JOUR AU - Mé AU - min A., Flament T. AU - my F. PY - 2015// TI - Interannual Variation of the Antarctic Ice Sheet from a Combined Analysis of Satellite Gravimetry and Altimetry Data T2 - Earth and Planetary Science Letters JO - Earth and Planetary Science Letters SP - 150 EP - 156 VL - 422 N2 - Assessment of the long term mass balance of the Antarctic Ice Sheet, and thus the determination of its contribution to sea level rise, requires an understanding of interannual variability and associated causal mechanisms. We performed a combined analysis of surface-mass and elevation changes using data from the GRACE and Envisat satellite missions, respectively. Using empirical orthogonal functions and singular value decompositions of each data set, we find a quasi 4.7-yr periodic signal between 08/2002 and 10/2010 that accounts for ∼ 15 – 30 % of the time variability of the filtered and detrended surface-mass and elevation data. Computation of the density of this variable mass load corresponds to snow or uncompacted firn. Changes reach maximum amplitude within the first 100 km from the coast where it contributes up to 30–35% of the annual rate of accumulation. Extending the analysis to 09/2014 using surface-mass changes only, we have found anomalies with a periodicity of about 4–6 yrs that circle the AIS in about 9–10 yrs. These properties connect the observed anomalies to the Antarctic Circumpolar Wave (ACW) which is known to affect several key climate variables, including precipitation. It suggests that variability in the surface-mass balance of the Antarctic Ice Sheet may also be modulated by the ACW. SN - 0012-821X UR - http://dx.doi.org/10.1016/j.epsl.2015.03.045 N1 - exported from refbase (http://publi.ipev.fr/polar_references/show.php?record=6341), last updated on Mon, 01 Jul 2024 14:18:38 +0200 ID - Mé_etal2015 ER -