Korean Journal of Remote Sensing (대한원격탐사학회지)

Korean Society of Remote Sensing (대한원격탐사학회)
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Intercomparison of Daegwallyeong Cloud Physics Observation System (CPOS) Products and the Visibility Calculation by the FSSP Size Distribution during 2006-2008

대관령 구름물리관측시스템 산출물 평가 및 FSSP를 이용한 시정환산 시험연구

  • Yang, Ha-Young (Hydrometeorological Resources Research Team, National Institute of Meteorological Research, KMA) ;
  • Jeong, Jin-Yim (Hydrometeorological Resources Research Team, National Institute of Meteorological Research, KMA) ;
  • Chang, Ki-Ho (Hydrometeorological Resources Research Team, National Institute of Meteorological Research, KMA) ;
  • Cha, Joo-Wan (Hydrometeorological Resources Research Team, National Institute of Meteorological Research, KMA) ;
  • Jung, Jae-Won (Hydrometeorological Resources Research Team, National Institute of Meteorological Research, KMA) ;
  • Kim, Yoo-Chul (Hydrometeorological Resources Research Team, National Institute of Meteorological Research, KMA) ;
  • Lee, Myoung-Joo (Hydrometeorological Resources Research Team, National Institute of Meteorological Research, KMA) ;
  • Bae, Jin-Young (Hydrometeorological Resources Research Team, National Institute of Meteorological Research, KMA) ;
  • Kang, Sun-Young (Hydrometeorological Resources Research Team, National Institute of Meteorological Research, KMA) ;
  • Kim, Kum-Lan (Korea Meterological Administration) ;
  • Choi, Young-Jean (Applied Meteorology Research Laboratory, National Institute of Meteorological Research, KMA) ;
  • Choi, Chee-Young (National Institute of Meteorological Research, KMA)
  • 양하영 (국립기상연구소 수문자원연구팀) ;
  • 정진임 (국립기상연구소 수문자원연구팀) ;
  • 장기호 (국립기상연구소 수문자원연구팀) ;
  • 차주완 (국립기상연구소 수문자원연구팀) ;
  • 정재원 (국립기상연구소 수문자원연구팀) ;
  • 김유철 (국립기상연구소 수문자원연구팀) ;
  • 이명주 (국립기상연구소 수문자원연구팀) ;
  • 배진영 (국립기상연구소 수문자원연구팀) ;
  • 강선영 (국립기상연구소 수문자원연구팀) ;
  • 김금란 (기상청) ;
  • 최영진 (국립기상연구소 응용기상연구과) ;
  • 최치영 (국립기상연구소)
  • Received : 2009.10.01
  • Accepted : 2010.04.26
  • Published : 2010.04.30
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Abstract

To observe and analyze the characteristics of cloud and precipitation properties, the Cloud physics Observation System (CPOS) has been operated from December 2003 at Daegwallyeong ($37.4^{\circ}N$, $128.4^{\circ}E$, 842 m) in the Taebaek Mountains. The major instruments of CPOS are follows: Forward Scattering Spectrometer Probe (FSSP), Optical Particle Counter (OPC), Visibility Sensor (VS), PARSIVEL disdrometer, Microwave Radiometer (MWR), and Micro Rain Radar (MRR). The former four instruments (FSSP, OPC, visibility sensor, and PARSIVEL) are for the observation and analysis of characteristics of the ground cloud (fog) and precipitation, and the others are for the vertical cloud characteristics (http://weamod.metri.re.kr) in real time. For verification of CPOS products, the comparison between the instrumental products has been conducted: the qualitative size distributions of FSSP and OPC during the hygroscopic seeding experiments, the precipitable water vapors of MWR and radiosonde, and the rainfall rates of the PARSIVEL(or MRR) and rain gauge. Most of comparisons show a good agreement with the correlation coefficient more than 0.7. These reliable CPOS products will be useful for the cloud-related studies such as the cloud-aerosol indirect effect or cloud seeding. The visibility value is derived from the droplet size distribution of FSSP. The derived FSSP visibility shows the constant overestimation by 1.7 to 1.9 times compared with the values of two visibility sensors (SVS (Sentry Visibility Sensor) and PWD22 (Present Weather Detect 22)). We believe this bias is come from the limitation of the droplet size range ($2{\sim}47\;{\mu}m$) measured by FSSP. Further studies are needed after introducing new instruments with other ranges.

구름과 강수특성을 분석하기 위해 대관령에 구름물리관측시스템(Cloud physics Observation System, 이하 CPOS)을 2003년부터 운영해 오고 있다. 주요 관측 기기는 다음과 같다: FSSP (Forward Scattering Spectrometer Probe), OPC (Optical Particle Counter), VS (Visibility Sensor), PARSIVEL disdrometer, MWR (Microwave Radiometer), MRR (Micro Rain Radar). 앞의 4개 장비는 지상구름 (안개)과 강수 특성을, 뒤의 2개 장비는 연직구름의 특성을 실시간으로 관측하고 있다. CPOS 산출물을 검증하기 위해 FSSP는 흡습성 물질 시딩 실험 중 OPC와, MWR의 가강수량은 라디오존데와, PARSIVEL과 MRR은 우량계와 비교 연구가 수행되었다. 그 결과를 보면 대부분이 0.7이상의 좋은 상관도를 보인다. 이와 같이 신뢰도를 확보한 CPOS 관측 자료는 구름과 에어로솔의 간접효과나 기상조절 실험에 유용한 자료로 활용될 수 있을 것이다. FSSP의 입자 크기 분포를 시정값으로 환산해 보았으며 FSSP 환산 시정값은 visibility sensors (SVS)와 PWD22 (Present Weather Detect 22)의 시정계 값에 비해 1.7~1.9배 과도한 경향을 보였다. 이는 FSSP에 의해 관측되는 입자 크기($2{\sim}47\;{\mu}m$)의 한계 때문으로 사료된다. 향후 다른 입자크기분포를 측정할 수 있는 장비를 도입하여 추가 분석을 추진할 계획이다.

Keywords

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