Three AMSR-E/AMSR2 Unified brightness temperature and sea ice polar gridded data sets, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), have been updated to correct errors in data designated with the B02 Product Maturity Code:
AMSR-E/AMSR2 Unified L3 Daily 6.25 km Polar Gridded 89 GHz Brightness Temperatures, Version 1 Data set DOI: https://doi.org/10.5067/NX1R09ORNOZN
AMSR-E/AMSR2 Unified L3 Daily 12.5 km Brightness Temperatures, Sea Ice Concentration, Motion & Snow Depth Polar Grids, Version 1 Data set DOI: https://doi.org/10.5067/RA1MIJOYPK3P
AMSR-E/AMSR2 Unified L3 Daily 25 km Brightness Temperatures & Sea Ice Concentration Polar Grids, Version 1 Data set DOI: https://doi.org/10.5067/TRUIAL3WPAUP
The following corrections are included in this update, which has been designated with the B04 Product Maturity code:
- A coding error was corrected which affected the 25km Northern Hemisphere ICEDIFF data fields with approximately 50% of the cells changing by -20 to 10 with a root mean square error of 8.
- An adjustment in the calculation of the ICEDIFF data fields was made which affected approximately 50% of all ICEDIFF data fields by +/-1.
- Northern Hemisphere water filter parameters were adjusted to better characterize the open water cluster during the cold months. This change affected data contained in the NH_ICEDIFF Data Fields from October through May and eliminated, on average, approximately 60% of false ice in the open ocean.
This update has been designated with the B04 Product Maturity code. The changes were implemented in two processing stages, B03 and B04. B03 was never publicly available and all changes are included in the B04 release.