Comparison between Monthly Mean Precipitation as estimated from TRMM Precipitation Radar observations and from Rain Gauge Data

摘要

[ABSTRACT] The monthly mean precipitations observed by the Tropical Rainfall Measuring Mission (TRMM) Precipitation Rader (PR), which were compiled and released by Japan Aerospace Exploration Agency, were compared with those observed at 180 rain gauge stations, including island stations in the Pacific Ocean, TAO/TRITON and PIRATA buoys, JMA Meteorological Observatories and AMeDAS stations. The correlation coefficient between the PR observations and those of the gauges was 0.53; the PR precipitation data were about 66% as large as the corresponding gauge data. The PR precipitation data are thus shown to be useful for qualitative analysis of distribution and variations in oceanic rainfall, although the PR data need quantitative improvement.