Spatial and Temporal Variability of Minimum Brightness Temperature at the 6.925 GHz Band of AMSR2 for the Arctic and Antarctic Oceans

The minimum brightness temperature (mBT) of seawater in the polar region is an important parameter algorithms for determining sea ice concentration or snow depth. To estimate mBT at 6.925 GHz Arctic and Antarctic Oceans to find their physical characteristics, we collected data from Advanced Microwave Scanning Radiometer 2 (AMSR2) eight years 2012 2020. estimated shows constant annual values, but found a significant difference seasonal variability between Oceans. We calculated with radiative transfer model parameterized by surface (SST), wind speed (SSW), integrated water vapor (IWV) compared them our observations. represents modeled emitted under conditions 2–5 m/s SSW SST below 0 °C, except summer. exceptional summer Ocean was related unusually high SST. evidence amplification mBT.