JpGU-AGU Joint Meeting 2020

Presentation information

[E] Oral

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

[A-CG51] Satellite Earth Environment Observation

convener:Riko Oki(Japan Aerospace Exploration Agency), Yoshiaki HONDA(Center for Environmental Remote Sensing, Chiba University), Yukari Takayabu(Atmosphere and Ocean Research Institute, the University of Tokyo), Tsuneo Matsunaga(Center for Global Environmental Research and Satellite Observation Center, National Institute for Environmental Studies)

[ACG51-15] Validation of DPR products by using MP-PAWR data - thunder storm case on August 27, 2018 –

*Nobuhiro Takahashi1, Takeharu Kouketsu1 (1.Institute for Space-Earth Environmental Research, Nagoya University)

Keywords:Precipitation, hail and grapple, multi-parameter radar

Validation of dual-frequency precipitation radar (DPR) onboard Global Precipitation Measurement (GPM) core observatory is aimed to evaluate not only the surface precipitation ratio and corresponding Z value but also three-dimensional structure of precipitation including cloud physical properties. Because of dual-frequency observation, GPM/DPR can estimate drop size distribution and rain/snow classification. Recently, GPM/DPR product added the information of the hail/graupel existence. These values are hard to be evaluated because of lack of the observation. A ground-based multi-parameter phased array weather radar (MP-PAWR) has advantages on the simultaneous three-dimensional observation and estimation of cloud physical properties. Since the MP-PAWR operates electrical scan in elevation and mechanical scan in azimuth, it completes the three-dimensional observation within 30 seconds. In addition, by using dual-polarization observation, cloud physical properties such as particle type classification can be achieved.

This study aims to evaluate the cloud physical properties estimated by GPM/DPR are evaluated ground-based multi-parameter weather radar. This study shows a case on August 27, 2018 when the GPM flew over Kanto area at 18:20 JST. Unfortunately, MP-PAWR was not operated because of power shutdown in this time frame (17:40-19:35). The X-band MP radar network (XRAIN) data are used for analysis. Even XRAIN consists of conventional multi-parameter radar, there are 5 radars over Kanto area and therefore the three-dimensional structure of precipitation system is retrieved by combining multiple radar. Three-dimensional wind field is estimated by the dual-Doppler analysis by using all combinations of radars.
The flagHeavyIcePrecipitation in GPM/DPR product, which indicates the existence of large particles above -10-degree Celsius height, were observed at the target area. The ground-based radar also caught the signature of mixed-phase precipitation indicating the existence both rain and ice particles. The precipitation system is sustained by the updraft less than 4 km in height. Note that hail storm was reported 30 to 20 minutes before the GPM observation. At that time, the precipitation system is characterized by the strong updraft above melting level ( > 5 km) and mixture of rain and ice particles even above the melting layer.