FN Archimer Export Format PT J TI Wave groups observed in pancake sea ice BT AF Thomson, Jim Gemmrich, Johannes Rogers, W. Erick Collins, Clarence O. ARDHUIN, Fabrice AS 1:1;2:2;3:3;4:4;5:5; FF 1:;2:;3:;4:;5:; C1 Applied Physics Laboratory University of Washington Seattle WA, USA University of Victoria ,Victoria BC , Canada Naval Research Laboratory ,Stennis Space Center MS, USA US Army Research and Development Center, Coastal Hydraulics Laboratory Duck NC , USA Univ. Brest, CNRS, Ifremer, IRD, Laboratoire d'Oceanographie Physique et Spatiale Brest 29200 ,France C2 UNIV WASHINGTON, USA UNIV VICTORIA, CANADA NAVAL RES LAB, USA US ARMY, USA CNRS, FRANCE UM LOPS IN WOS Cotutelle UMR copubli-int-hors-europe IF 3.559 TC 14 UR https://archimer.ifremer.fr/doc/00587/69864/67763.pdf https://archimer.ifremer.fr/doc/00587/69864/67766.pdf LA English DT Article AB Ocean surface waves propagating through sea ice are scattered and dissipated. The net attenuation occurs preferentially at the higher frequencies, and thus the spectral bandwidth of a given wave field is reduced, relative to open water. The reduction in bandwidth is associated with an increase in the groupiness of the wave field. Using SWIFT buoy data from the 2015 Arctic Sea State experiment, bandwidth is compared between pancake ice and open water conditions, and the linkage to group envelopes is explored. The enhancement of wave groups in ice is consistent with the simple linear mechanism of superposition of waves with narrowing spectral bandwidth. This is confirmed using synthetic data. Nonlinear mechanisms, which have been shown as significant in other ice types, are not found to be important in this data set. PY 2019 PD NOV SO Journal Of Geophysical Research-oceans SN 2169-9275 PU American Geophysical Union (AGU) VL 124 IS 11 UT 000494997000001 BP 7400 EP 7411 DI 10.1029/2019JC015354 ID 69864 ER EF