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26 October 2011Detection of convective cells with a potential to produce local heavy rainfalls by a C-band polarimetric radar
Recent studies have shown that polarimetric radars are capable of providing distributions of rain intensity with high
accuracy. Variables obtained by the polarimetric radars include radar reflectivity factor (Zhh), differential propagation
phase (Φdp) and differential reflectivity (Zdr). A number of methods to estimate rain intensity from these variables have
been proposed. In this study, the rain intensity estimated from the differential reflectivity and radar reflectivity factor
measured with a C-band polarimetric radar is used to analyze a local heavy rainfall event as a case study because the
differential reflectivity measured with C-band radar is more sensitive to large raindrops associated with heavy rainfalls
than is radars operating at other frequencies. Results show that the estimated rainfall intensity agrees well with surface
observations made during the event. Moreover, the so-called high Zdr column, a large differential reflectivity region was
clearly analyzed aloft about 10 minutes prior to the local heavy rainfall on the ground, suggesting that the differential
reflectivity observed with C-band polarimetric radar can be a good index to detect heavy precipitation events in advance.
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Ahoro Adachi, Takahisa Kobayashi, Hiroshi Yamauchi, Shigeru Onogi, "Detection of convective cells with a potential to produce local heavy rainfalls by a C-band polarimetric radar," Proc. SPIE 8177, Remote Sensing of Clouds and the Atmosphere XVI, 81770P (26 October 2011); https://doi.org/10.1117/12.897807