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Algorithms
DMSP SSM/I ocean surface winds depict wind speeds (no direction) at an elevation of 19.5m. The SSM/I brightness temperatures used are those calculated by the Navy at the Fleet Numerical Meteorology and Oceanography Center (FNMOC). The wind speed algorithm used was developed by Goodberlet et al., and expresses the wind speed, WS, in meters/second as:WS=147.90+1.0969*TB19v-0.4555*TB22v-1.7600*TB37v+0.7860*TB37h
where:TB is the radiometric brightness temperature at the frequencies and polarizations indicated. All data where TB37v-TB37hr < 50 or TB19h > 165 was rain flagged. The global map browse product is divided into 30x20 degree bins for closer examination between latitudes 60N to 60S and longitudes 180W to 180E. The strictest rain flag has been used to yield wind speeds within 2m/s.
Usage Caveats:
- Presented wind speed quantities should not be considered absolute
- In storms with high wind gradients, the wind speed values will be underestimated
- Rain flags in use will not necessarily detect all precipitation events
- Data buffer is 18 hours prior to the most recent update time.
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