9:00 AM - 10:30 AM
[ACG37-P05] Improvement of GSMaP_MWR by CDF matching with respect to GPM/DPR observations
Keywords:microwave radiometer, radar, precipitation, cumulative distribution function matching
Our results show that the CDF matching decreases differences between GSMaP_MWR and DPR for all seasons, especially on land in the Northern hemisphere, in the Southern hemisphere, and throughout the globe for MAM and JJA, DJF, and SON, respectively. These results indicate that the impacts of CDF matching varies seasonally for each region.
Furthermore, our results show that for DJF, MAM, and SON, CDF matching successfully improved the accuracy of the GSMaP_MWR in Japan. The monthly mean absolute error (MAE) between the GSMaP_MWR and Radar-AMeDAS decreased after the CDF matching in months except for JJA. In addition, the difference in the seasonal average of precipitation amount between the GSMaP_MWR and Radar-AMeDAS became smaller for these periods. On the other hand, the monthly MAE increased and the difference in the seasonal average of precipitation amount increased after the CDF matching in JJA. This is presumed to have occurred owing to the large difference between the data samples in DPR and in Radar-AMeDAS for this season. However, the difference in the average annual precipitation amount between the GSMaP_MWR and Radar-AMeDAS decreased, indicating that the CDF matching method in this study improved the accuracy of the GSMaP_MWR overall.