Data on ice dynamics of the region (Baffin Bay and Nares Strait) were extracted from satellite images from National Snow and Ice Data Center (NSIDC) and from NASA Earth Observatory (SMMR, SSM/I and SSMIS sensors) from 2005 to 201843. The beginning of open water (OW) and the start of the new winter sea-ice (NWSI) period were determined as in Marchese et al.10. The duration of the OW season was defined as number of days between opening of the North Water polynya and NWSI, when ice reformed over the region. The date of ice bridge collapse (IBC) in Nares Strait was determined from a visual analysis of ice charts produced by the Canadian Ice Service and images from NSIDC and NASA consistent with earlier studies14,44.

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