9:55 AM - 10:20 AM
★ [U02-03] New Precipitation Measurement Opened by TRMM and GPM
Keywords:satellite, precipitation, Earth observation, remote sensing, TRMM, GPM
DPR is a child of TRMM PR. DPR consists of Ku and Ka-band radar. The Ku-band radar is based on the PR design, but the Ka-band radar is a newly designed one. After the launch of the GPM core satellite in February 2014, DPR performance is well examined by using ground-based calibrators, and comparisons with ground-based radars, rain gauges, etc. Statistical results on global precipitation were also evaluated with TRMM PR long-term statistics. Fortunately, TRMM PR was working even after the GPM core satellite launch, and DPR data have been compared with TRMM PR data for near simultaneous observations of precipitation systems. The Ku-band radar data showed excellent consistency with PR data. It has also been proved that the Ka-band radar performance meets the engineering specifications. Weak precipitation is detected with the Ka-band radar and its profiles show clear difference from the Ku-radar, but full utilization of the Ka-radar data is yet to be demonstrated.
One of the objectives of GPM is to expand the precipitation observation coverage into mid- and high-latitude regions where no TRMM data are available. The precipitation systems are associated with mid-latitude depressions, cold outbreaks over warm sea, etc., and are very different from those in tropical regions. The techniques developed and applied to rain in tropical regions using TRMM data may not work well for mid- and high-latitude regions. Water equivalent snow rate retrieval is a challenge for GPM. The advantage of DPR is expected to appear there. More precise rain rate retrieval for rain is another objective of DPR. Currently, DPR algorithm development is on-going, and soon new results could come out.
Combining the GPM core satellite data with other microwave radiometer satellites, global precipitation maps should have wider coverage and better accuracy. This could open new and wide applications for human societies. Also, the capability of DPR to penetrate precipitation system must contribute to better understanding of the structure of global precipitation systems and its climatology.