Japan Geoscience Union Meeting 2015

Presentation information

International Session (Oral)

Symbol A (Atmospheric and Hydrospheric Sciences) » A-CG Complex & General

[A-CG09] Satellite Earth Environment Observation

Thu. May 28, 2015 9:00 AM - 10:45 AM 301B (3F)

Convener:*Riko Oki(Japan Aerospace Exploration Agency), Tadahiro Hayasaka(Graduate School of Science, Tohoku University), Kaoru Sato(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo), Masaki Satoh(Atmosphere and Ocean Research Institute, The University of Tokyo), Nobuhiro Takahashi(National Institute of Information and Communications Technology), Yoshiaki HONDA(Center for Environmental Remote Sensing, Chiba University), Kenlo Nasahara(Faculty of Life and Environmental Sciences, University of Tsukuba), Takashi Nakajima(Tokai University, School of Information Science & Technology, Dept. of Human & Information Science), Taikan Oki(Institute of Industrial Science, The University of Tokyo), Tatsuya Yokota(National Institute for Environmental Studies), Yukari Takayabu(Atmosphere and Ocean Research Institute, the University of Tokyo), Hiroshi Murakami(Earth Observation Research Center, Japan Aerospace Exploration Agency), Hajime Okamoto(Kyushu University), Chair:Takuji Kubota(Earth Observation Research Center,Japan Aerospace Exploration Agency)

10:00 AM - 10:15 AM

[ACG09-17] Early results of Dual-frequency Precipitation Radar on Global Precipitation Measurement Core Observatory

*Takuji KUBOTA1, Toshio IGUCHI2, Shinta SETO3, Jun AWAKA4, Shinji URITA5, Nozomi KAWAMOTO5, Naofumi YOSHIDA5, Riko OKI1 (1.Japan Aerospace Exploration Agency, 2.National Institute of Information and Communications Technology, 3.Nagasaki University, 4.Tokai University, 5.Remote Sensing Technology Center of Japan)

Keywords:Global Precipitation Measurement, Dual- frequency Precipitation Radar, Tropical Rainfall Measuring Mission, Precipitation Radar, rain gauge

The Global Precipitation Measurement (GPM) Mission consists of a Tropical Rainfall Measuring Mission (TRMM)-like non-sun-synchronous orbiting satellite (GPM Core Observatory) and a constellation of satellites carrying microwave radiometer instruments. The GPM Core Observatory, which was launched on 28 February 2014 (JST), carries the Dual-frequency Precipitation Radar (DPR) developed by the Japan Aerospace Exploration Agency (JAXA) and the National Institute of Information and Communications Technology (NICT). The DPR consists of two radars; Ku-band (13.6 GHz) precipitation radar (KuPR) and Ka-band (35.55 GHz) radar (KaPR). The DPR is expected to advance precipitation science by expanding the coverage of observations to higher latitudes than those obtained by the TRMM Precipitation Radar (PR), by measuring snow and light rain via high-sensitivity observations from the KaPR, and by providing drop size distribution (DSD) information based on the differential scattering properties of the two frequencies. For operational productions of precipitation datasets, it is necessary to develop computationally efficient, fast-processing DPR Level-2 (L2) algorithms that can provide estimated precipitation rates, radar reflectivity factors, and precipitation information, such as the DSD and precipitation type. The L2 algorithms have been developed by the DPR Algorithm Development Team under the NASA-JAXA Joint Algorithm Team.
The DPR data have been evaluated in terms of consistency with TRMM/PR data, and comparison with ground instruments. All GPM standard products have been released to the public since September 2014 after achievement of release criteria of the products. The release criteria of the DPR precipitation products is less than 50% differences of averaged surface precipitation rates between the GPM/DPR and the TRMM/PR are over the ocean. In addition, success criteria of the DPR product is defined as less than 10% difference in annual rainfall amounts compared with ground-based measurements. In this work, the current DPR evaluations using TRMM/PR data and ground rain gauge data over the Japan will be presented.