This report describes field activities of the Aerial Surveys of Arctic Marine Mammals (ASAMM) project conducted during summer and fall (1 July–31 October) 2015 and data analyses used to summarize field activities. Surveys were based in Barrow, Alaska, and Deadhorse, Alaska, and targeted the northeastern and southcentral Chukchi and western Beaufort seas, between 67°N and 72°N latitude and 140°W and 169°W longitude.
Sea ice cover in the study area in 2015 was generally light compared with historical (pre-2007) sea ice cover. In early July, sea ice in the eastern Chukchi Sea remained north of 71.5°N. By late July, sea ice remained in the Hanna Shoal area, but was otherwise absent from the Chukchi Sea study area. Sea ice persisted in most of the western Beaufort Sea through August. From early September through mid-October, sea ice was largely absent from the ASAMM study area although some grounded ice remained nearshore between Camden Bay and Deadhorse. By late
October, new ice was forming in the northern blocks and in shallow nearshore areas in the
western Beaufort Sea study area. The northeastern Chukchi Sea study area remained almost
completely ice free through late October, with sea ice present only in shallow nearshore areas.