Monthly Level - 3 Rainfall Accumulations Algorithm Theoretical Basis Document
نویسنده
چکیده
This algorithm was originally developed for application to the SSM/I instrument for the Global Precipitation Climatology Project (GPCP) (Wilheit et al., 1991) The lowest frequency of the SSM/I was 19.35 GHz so that many heavy rain events could not be measured due to saturation. The use of the form of the rain PDF allowed us to fill in the contribution from these heavy rain rates by extrapolation. This algorithm was also modified for application to the Tropical Rainfall Measuring Mission (TRMM) and remains as the 3A11 product (monthly rain totals). The algorithm has proved very stable. It was chosen for the launch version of the AMSR-E monthly rainfall algorithm for this stability since the quality of the instrumental calibration was a large uncertainty in the beginning. It also permits direct comparisons with the long record of SSM/I-based rainfall totals going back to 1987.
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