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Korean Meteorological Society (한국기상학회)
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Study on the Application of 2D Video Disdrometer to Develope the Polarimetric Radar Data Simulator

이중편파레이더 시뮬레이터 개발을 위한 2차원 영상우적계 관측자료의 활용가능성 연구

  • Kim, Hae-Lim (Radar Analysis Division, Weather Radar Center, Korea Meteorological Administration) ;
  • Park, Hye-Sook (Radar Analysis Division, Weather Radar Center, Korea Meteorological Administration) ;
  • Park, Hyang Suk (Radar Analysis Division, Weather Radar Center, Korea Meteorological Administration) ;
  • Park, Jong-Seo (Radar Analysis Division, Weather Radar Center, Korea Meteorological Administration)
  • 김해림 (기상청 기상레이더센터 레이더분석과) ;
  • 박혜숙 (기상청 기상레이더센터 레이더분석과) ;
  • 박향숙 (기상청 기상레이더센터 레이더분석과) ;
  • 박종서 (기상청 기상레이더센터 레이더분석과)
  • Received : 2013.12.27
  • Accepted : 2014.05.06
  • Published : 2014.06.30
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Abstract

The KMA has cooperated with the Oklahoma University in USA to develop a Polarimetric Radar Data (PRD) simulator to improve the microphysical processes in Korea Local Analysis and Prediction System (KLAPS), which is critical for the utilization of PRD into Numerical Weather Prediction (NWP) field. The simulator is like a tool to convert NWP data into PRD, so it enables us to compare NWP data with PRD directly. The simulator can simulate polarimetric radar variables such as reflectivity (Z), differential reflectivity ($Z_{DR}$), specific differential phase ($K_{DP}$), and cross-correlation coefficient (${\rho}_{hv}$) with input of the Drop Size Distribution (DSD) and scattering calculation of the hydrometeors. However, the simulator is being developed based on the foreign observation data, therefore the PRD simulator development reflecting rainfall characteristics of Korea is needed. This study analyzed a potential application of the 2-Dimension Video Disdrometer (2DVD) data by calculating the raindrop axis ratio according to the rain-types to reflect Korea's rainfall characteristics into scattering module in the simulator. The 2DVD instrument measures the precipitation DSD including the fall velocity and the shape of individual raindrops. We calculated raindrop axis ratio for stratiform, convective and mixed rainfall cases after checking the accuracy of 2DVD data, which usually represent the scattering characteristics of precipitation. The raindrop axis ratio obtained from 2DVD data are compared with those from foreign database in the simulator. The calculated the dual-polarimetric radar variables from the simulator using the obtained raindrop axis ratio are also compared with in situ dual-polarimetric observation data at Bislsan (BSL). 2DVD observation data show high accuracies in the range of 0.7~4.8% compared with in situ rain gauge data which represents 2DVD data are sufficient for the use to simulator. There are small differences of axis ratio in the diameter below 1~2 mm and above 4~5 mm, which are more obvious for bigger raindrops especially for a strong convective rainfall case. These differences of raindrop axis ratio between domestic and foreign rainfall data base suggest that the potential use of disdrometer observation can develop of a PRD simulated suitable to the Korea precipitation system.

Keywords

References

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