Table 2. The variables used in the model and their descriptions.

Variable	Description
d2coast	Distance (km) from the location to the nearest coastline
depth_m	Depth (m) of the seafloor at the location based on the ETOPO2v2 Global Gridded database
d21kiso	Distance (km) from the location to the 1000 m depth isobar, estimated from the ETOPO2v2 Global Gridded database
d2ice	Distance (km) from the location to ice edge (defined as the daily AMSR-E 10% ice concentration contour)
ice_conc	The daily AMSR-E percent ice concentration at the location
sea_ice	A binary variable (yes or no) indicating whether the location is in a field of sea-ice (based on the daily AMSR-E data) or in open water