The Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS dataset, distributed through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) is now at Version 3.1. In the latest release, the sea ice concentration field derived from the Bootstrap algorithm uses an "open water" identifier that is calculated daily in May and October. In Version 3.0, this value was calculated using a single monthly value for May and a single monthly value for October. The difference in total Arctic sea ice area and sea ice extent between the two versions is typically small (less than ± 0.5%), except in the second half of May when daily sea ice areas are often 0.5-1.5% higher and extents are 1-3% higher in Version 3.1 than in Version 3.0.
Data Set DOI: https://doi.org/10.5067/7Q8HCCWS4I0R