이중편파레이더 시뮬레이터 개발을 위한 2차원 영상우적계 관측자료의 활용가능성 연구
Study on the Application of 2D Video Disdrometer to Develope the Polarimetric Radar Data Simulator
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참고문헌
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초록
The KMA has cooperated with the Oklahoma University in USA to develop a PolarimetricRadar Data (PRD) simulator to improve the microphysical processes in Korea Local Analysisand Prediction System (KLAPS), which is critical for the utilization of PRD into NumericalWeather Prediction (NWP) field. The simulator is like a tool to convert NWP data into PRD, so itenables us to compare NWP data with PRD directly. The simulator can simulate polarimetric radarvariables such as reflectivity (Z), differential reflectivity (ZDR), specific differential phase (KDP), andcross-correlation coefficient (ρhv) with input of the Drop Size Distribution (DSD) and scattering calculationof the hydrometeors. However, the simulator is being developed based on the foreign observationdata, therefore the PRD simulator development reflecting rainfall characteristics of Korea isneeded. 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 characteristicsinto scattering module in the simulator. The 2DVD instrument measures the precipitationDSD including the fall velocity and the shape of individual raindrops. We calculated raindrop axisratio 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 ratioobtained from 2DVD data are compared with those from foreign database in the simulator. The calculatedthe dual-polarimetric radar variables from the simulator using the obtained raindrop axisratio are also compared with in situ dual-polarimetric observation data at Bislsan (BSL). 2DVDobservation data show high accuracies in the range of 0.7~4.8% compared with in situ rain gaugedata which represents 2DVD data are sufficient for the use to simulator. There are small differencesof axis ratio in the diameter below 1~2 mm and above 4~5 mm, which are more obvious for biggerraindrops especially for a strong convective rainfall case. These differences of raindrop axis ratiobetween domestic and foreign rainfall data base suggest that the potential use of disdrometer observationcan develop of a PRD simulated suitable to the Korea precipitation system.
Abstract
The KMA has cooperated with the Oklahoma University in USA to develop a PolarimetricRadar Data (PRD) simulator to improve the microphysical processes in Korea Local Analysisand Prediction System (KLAPS), which is critical for the utilization of PRD into NumericalWeather Prediction (NWP) field. The simulator is like a tool to convert NWP data into PRD, so itenables us to compare NWP data with PRD directly. The simulator can simulate polarimetric radarvariables such as reflectivity (Z), differential reflectivity (ZDR), specific differential phase (KDP), andcross-correlation coefficient (ρhv) with input of the Drop Size Distribution (DSD) and scattering calculationof the hydrometeors. However, the simulator is being developed based on the foreign observationdata, therefore the PRD simulator development reflecting rainfall characteristics of Korea isneeded. 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 characteristicsinto scattering module in the simulator. The 2DVD instrument measures the precipitationDSD including the fall velocity and the shape of individual raindrops. We calculated raindrop axisratio 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 ratioobtained from 2DVD data are compared with those from foreign database in the simulator. The calculatedthe dual-polarimetric radar variables from the simulator using the obtained raindrop axisratio are also compared with in situ dual-polarimetric observation data at Bislsan (BSL). 2DVDobservation data show high accuracies in the range of 0.7~4.8% compared with in situ rain gaugedata which represents 2DVD data are sufficient for the use to simulator. There are small differencesof axis ratio in the diameter below 1~2 mm and above 4~5 mm, which are more obvious for biggerraindrops especially for a strong convective rainfall case. These differences of raindrop axis ratiobetween domestic and foreign rainfall data base suggest that the potential use of disdrometer observationcan develop of a PRD simulated suitable to the Korea precipitation system.
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