Ms. Moeka Yamaji Profile

Moeka Yamaji

at Japan Aerospace Exploration Agency

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Publications (2)

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Proceedings Article | 23 October 2018 Paper

Drop size distribution observed by dual-frequency precipitation radar onboard global precipitation measurement core satellite

Moeka Yamaji, Takuji Kubota, Hiroshi Takahashi, Atsushi Hamada, Yukari Takayabu, Riko Oki

Proceedings Volume 10782, 107820H (2018) https://doi.org/10.1117/12.2324640

KEYWORDS: Radar, Satellites, Statistical analysis, Earth observing sensors, Particles

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This study investigated the drop size distribution (DSD) observed by the Dual-frequency Precipitation Radar (DPR) onboard the Global Precipitation Measurement (GPM) core satellite, which makes the world’s first dual-frequency preciptation observations by space-borne radar. Four years have passed since the launch of the GPM core satellite, and data have been accumulated. This study focuses on the characteristics of DSD derived from the GPM/DPR measurements. In this study, DSD parameters (especially for a mass-weighted mean diameter, Dm) which are estimated based on dual-frequency information derived from GPM/DPR are analyzed with seasonal variations and precipitation characteristics. Values of Dm are generally larger over land than over the oceans. DSD shows seasonal variation, especially over the mid-latitude ocean; Dm in the winter season over the mid-latitude ocean is larger than that in the summer season in both the Northern and Southern hemispheres. Focusing on the mid-latitude North Pacific Ocean close to Japan in winter, precipitation top height is lower and stratiform ratio is higher than those in summer. It suggests that differences of Dm are associated with those of precipitation regimes, such as organized precipitation system in summer season and extratropical frontal systems in winter season.

Proceedings Article | 22 October 2018 Paper

Impact study on the accuracy of Global Satellite Mapping of Precipitation (GSMaP) caused by future small precipitation radar constellation

Moeka Yamaji, Takuji Kubota, Riko Oki

Proceedings Volume 10776, 1077614 (2018) https://doi.org/10.1117/12.2323967

KEYWORDS: Radar, Satellites, Meteorology

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Japan Aerospace Exploration Agency (JAXA) has addressed the water issues by conducting the Global Precipitation Measurement (GPM) Mission. GPM core satellite carries Dual-frequency Precipitation Radar (DPR). DPR can observe 3-dimensional precipitation with high accuracy, whereas the observation swath is narrow, and observation is not so frequent. To achieve the high frequent precipitation observation, we developed the multi-satellite precipitation product called Global Satellite Mapping of Precipitation (GSMaP) under the collaboration with international GPM constellation satellite. GSMaP provides hourly global precipitation distribution by 0.1 x 0.1 degrees latitude/longitude, and its utilization is spread especially over the Asian countries and used in various fields. As one of the future precipitation observation missions discussed in JAXA, there is the concept of small precipitation radar constellation. This can improve the quality of GSMaP if realized. In this study, the impact on accuracy of GSMaP caused by the increase of radar observation is evaluated over Japan area. Japan Meteorological Agency provides highaccurate and high-resolution ground precipitation radar data calibrated by rain gauges. This ground observation data is assumed as future precipitation radar data and inserted to the GSMaP processing in some temporal intervals. The sampling errors are taken into consideration. The relationship between temporal interval of insertion (assumed as radar observation frequency) and improvement of accuracy is verified and discussed.

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