[A-CG37] Satellite Earth Environment Observation

[ACG37-P04] Product validations of the spaceborne precipitation radar at Kumamoto in a field campaign for "Senjo-kousuitai"

*Takuji Kubota¹, Kosuke Yamamoto¹, Yuki Kaneko¹, Toshiyuki Tanaka¹, Takeshi Masaki², Tomohiko Higashiuwatoko², Gennosuke Kikuchi², Masato Ito² (1.Earth Observation Research Center,Japan Aerospace Exploration Agency, 2.Remote Sensing Technology Center of Japan)

Keywords:Spaceborne precipitation radar, Validation

In order to accelerate research into a mechanism of stationary linear mesoscale convective systems, “Senjo-kousuitai”, the Meteorological Research Institute (MRI) in the Japan Meteorological Agency, in collaboration with 14 institutions such as universities, conducted intensive, high-density field campaigns observed from June to October 2022 to understand the conditions under which the Senjo-kousuitai is likely to occur and the internal structure of the Senjo-kousuitai (Kato et al., 2022). The Japan Aerospace Exploration Agency (JAXA) carried out the observation using the ground observation instruments at the Kumamoto Local Meteorological Observatory in order to observe the precipitation particles inside the precipitation system which constitutes the Senjo-kousuitai. In addition, observation data from the ground instruments and JAXA’s satellite products were provided to the Senjo-kousuitai database operated by the MRI.
At the Kumamoto Local Meteorological Observatory, a Micro Rain Radar (MRR -2 J) and a disdrometer (COTT-Parsivel -2) were installed to make observations from May 24, 2022 to October 25. On July 19, at 1:20, Fukuoka Prefecture (Fukuoka, Chikuho and Chikugo regions) and Saga Prefecture (south) announced the occurrence of the Senjo-kousuitai, as weather information on significant heavy rainfall. Precipitation systems associated with this Senjo-kousuitai could be observed from 4:00 to 5:00 on July 19 at the Kumamoto Local Meteorological Observatory.
Also, from July 8 to 9, it rained heavily in Kyushu. At 23:44 on July 8, the Dual-Frequency Precipitation Radar (DPR) onboard the Global Precipitation Measurement (GPM) Core Observatory passed over Kyushu and observed the three-dimensional structure of heavy rainfall. The Kumamoto Local Meteorological Observatory could also be observed with GPM/DPR, simultaneously from satellites and from the ground.
Furthermore, JAXA has provided satellite observation data, precipitation (GSMaP), accumulated water vapor and sea surface temperature (GCOM-W/Shizuku, GCOM-C/Shikisai, etc.) in addition to observations by ground instruments at the Kumamoto Local Meteorological Observatory, to a database operated by the MRI. These datasets can contribute to the elucidation of the mechanism of generation and maintenance of the Senjo-kousuitai and the improvement of prediction technology.
In this paper, activities for product validations of the GPM/DPR are described using the ground observations at the Kumamoto Local Meteorological Observatory.