Print Email Facebook Twitter The Effect of Foehn-Induced Surface Melt on Firn Evolution Over the Northeast Antarctic Peninsula Title The Effect of Foehn-Induced Surface Melt on Firn Evolution Over the Northeast Antarctic Peninsula Author Datta, Rajashree Tri (University of Maryland; NASA Goddard Space Flight Center; Columbia University; CUNY Advanced Science Research Center) Tedesco, Marco (NASA Goddard Institute for Space Studies; Columbia University) Fettweis, Xavier (Université de Liège) Agosta, Cecile (Université Grenoble Alpes; Student TU Delft) Lhermitte, S.L.M. (TU Delft Mathematical Geodesy and Positioning) Lenaerts, Jan T.M. (University of Colorado) Wever, Nander (University of Colorado) Date 2019 Abstract Surface meltwater ponding has been implicated as a major driver for recent ice shelf collapse as well as the speedup of tributary glaciers in the northeast Antarctic Peninsula. Surface melt on the NAP is impacted by the strength and frequency of westerly winds, which result in sporadic foehn flow. We estimate changes in the frequency of foehn flow and the associated impact on snow melt, density, and the percolation depth of meltwater over the period 1982–2017 using a regional climate model and passive microwave data. The first of two methods extracts spatial patterns of melt occurrence using empirical orthogonal function analysis. The second method applies the Foehn Index, introduced here to capture foehn occurrence over the full study domain. Both methods show substantial foehn-induced melt late in the melt season since 2015, resulting in compounded densification of the near-surface snow, with potential implications for future ice shelf stability. Subject Antarctic Peninsulafirn densificationfoehn effectLarsen C ice shelfsurface melt To reference this document use: http://resolver.tudelft.nl/uuid:a5097ad3-b992-442d-965a-4a8714e90648 DOI https://doi.org/10.1029/2018GL080845 Embargo date 2019-10-11 ISSN 0094-8276 Source Geophysical Research Letters, 46 (7), 3822-38-31 Part of collection Institutional Repository Document type journal article Rights © 2019 Rajashree Tri Datta, Marco Tedesco, Xavier Fettweis, Cecile Agosta, S.L.M. Lhermitte, Jan T.M. Lenaerts, Nander Wever Files PDF Datta_et_al_2019_Geophysi ... etters.pdf 2.98 MB Close viewer /islandora/object/uuid:a5097ad3-b992-442d-965a-4a8714e90648/datastream/OBJ/view