FN Archimer Export Format PT J TI Strong and highly variable push of ocean waves on Southern Ocean sea ice BT AF STOPA, Justin SUTHERLAND, Peter ARDHUIN, Fabrice AS 1:1,2;2:1;3:3; FF 1:PDG-ODE-LOPS-SIAM;2:PDG-ODE-LOPS-SIAM;3:; C1 UBO, CNRS, LOPS, IRD,Inst Francais Rech Exploitat Mer IFREMER, F-29280 Plouzane, France. Univ Hawaii Manoa, Sch Ocean & Earth Sci & Technol, Dept Ocean Resources & Engn, Honolulu, HI 96822 USA. C2 IFREMER, FRANCE UNIV HAWAII MANOA, USA CNRS, FRANCE SI BREST SE PDG-ODE-LOPS-SIAM UM LOPS IN WOS Ifremer jusqu'en 2018 copubli-france copubli-int-hors-europe IF 9.58 TC 54 UR https://archimer.ifremer.fr/doc/00444/55609/57255.pdf https://archimer.ifremer.fr/doc/00444/55609/57256.pdf LA English DT Article DE ;wave-ice interaction;Southern Ocean marginal ice zone;wave radiation stress;Sentinel-1 SAR;synthetic aperture radar AB Sea ice in the Southern Ocean has expanded over most of the past 20 y, but the decline in sea ice since 2016 has taken experts by surprise. This recent evolution highlights the poor performance of numerical models for predicting extent and thickness, which is due to our poor understanding of ice dynamics. Ocean waves are known to play an important role in ice break-up and formation. In addition, as ocean waves decay, they cause a stress that pushes the ice in the direction of wave propagation. This wave stress could not previously be quantified due to insufficient observations at large scales. Sentinel-1 synthetic aperture radars (SARs) provide high-resolution imagery from which wave height is measured year round encompassing Antarctica since 2014. Our estimates give an average wave stress that is comparable to the average wind stress acting over 50 km of sea ice. We further reveal highly variable half-decay distances ranging from 400 m to 700 km, and wave stresses from 0.01 to 1 Pa. We expect that this variability is related to ice properties and possibly different floe sizes and ice thicknesses. A strong feedback of waves on sea ice, via break-up and rafting, may be the cause of highly variable sea-ice properties. PY 2018 PD JUL SO Proceedings Of The National Academy Of Sciences Of The United States Of America SN 0027-8424 PU Natl Acad Sciences VL 115 IS 23 UT 000434114900033 BP 5861 EP 5865 DI 10.1073/pnas.1802011115 ID 55609 ER EF