Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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A Case Study on the Impact of Ground-based Glaciogenic Seeding on Winter Orographic Clouds at Daegwallyeong

겨울철 대관령지역 지형성 구름에 대한 지상기반 구름씨뿌리기 영향 사례연구

  • Yang, Ha-Young (Applied Meteorology Research Division, National Institute of Meteorological Research) ;
  • Chae, Sanghee (Applied Meteorology Research Division, National Institute of Meteorological Research) ;
  • Jeong, Jin-Yim (Applied Meteorology Research Division, National Institute of Meteorological Research) ;
  • Seo, Seong-Kyu (Applied Meteorology Research Division, National Institute of Meteorological Research) ;
  • Park, Young-San (Applied Meteorology Research Division, National Institute of Meteorological Research) ;
  • Kim, Baek-Jo (Applied Meteorology Research Division, National Institute of Meteorological Research)
  • 양하영 (국립기상과학원 응용기상연구과) ;
  • 채상희 (국립기상과학원 응용기상연구과) ;
  • 정진임 (국립기상과학원 응용기상연구과) ;
  • 서성규 (국립기상과학원 응용기상연구과) ;
  • 박영산 (국립기상과학원 응용기상연구과) ;
  • 김백조 (국립기상과학원 응용기상연구과)
  • Received : 2015.05.28
  • Accepted : 2015.07.28
  • Published : 2015.08.30
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Abstract

The purpose of this study was to investigate the impact of ground-based glaciogenic seeding on orographic clouds in the Daegwallyeong area on 13 March, 2013. The experiments was conducted by releasing silver iodide (AgI) under following conditions: surface temperature below $-4^{\circ}C$, wind direction between 45 and $130^{\circ}$, and wind speed less than $5ms^{-1}$. Two seeding rates, $38gh^{-1}$ (SR1) and $113gh^{-1}$ (SR2), were tested to obtain an appropriate AgI ratio for snowfall enhancement in the Daegwallyeong area. Numerical simulations were carried out by using the WRF (Weather Research and Forecast) model with AgI point-source module which predicted dispersion fields of AgI particles. The results indicated that the target orographic clouds contained adequate amount of supercooled liquid water and that the dispersion of AgI particles tended to move along the prevailing wind direction. To validate the seeding effects, the observation data from FM-120 and MPS as well as PARSIVEL disdrometer were analyzed. In this case study, glaciogenic seeding significantly increased the concentration of small ice particles below 1 mm in diameter. The observation results suggest that SR1 seeding be reasonable to use the ground-based seeding in the Daegwallyeong area.

본 연구에서는 겨울철 대관령지역의 지형성 구름에 대해 인공증설을 위한 구름씨뿌리기(이하 시딩) 영향을 알아보기 위해서 2013년 3월 13일 실험사례를 분석하였다. 지상연소기를 이용하여 기온 $-4^{\circ}C$ 이하, 풍향 $45-130^{\circ}$, 풍속 $5ms^{-1}$ 이하일 때 AgI 입자를 시딩 하였으며 대관령지역에서 적절한 시딩량을 알아보기 위해 $38gh^{-1}$ (SR1)과 $113gh^{-1}$ (SR2)에 대해 실험을 수행하였다. AgI point-source 모듈을 추가한 WRF (Weather Research and Forecast) 수치모의실험을 통해 시딩 물질의 확산장을 알아보았다. 수치모의 결과 과냉각수적이 충분히 존재한 상태에서 실험이 실시되었으며 시딩 물질은 주풍에 따라 이동하는 경향을 보였다. 시딩 효과를 알아보기 위해 안개입자측정기, 강수입자측정기와 광학우적계에서 관측된 자료를 분석하였다. 본 연구사례에서는 빙정핵 시딩에 의해 1 mm 이하 크기의 강수입자 수농도의 증가가 나타났으며 대관령지역에는 SR1 시딩이 더 적절하다고 판단된다.

Keywords

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