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RISS 인기검색어
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- 저자 : 채상희(Chae, Sanghee) (검색결과 3 건)
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은승희(Seung-Hee Eun),채상희(Sang-Hee Chae),김병곤(Byung-Gon Kim),장기호(Ki-Ho Chang) 한국기상학회 2011 대기 Vol.21 No.3
The continuous urbanizations by a rapid economic growth and a steady increase in population are expected to have a possible impact on meteorology in the downwind region. Long-term (1972~2007) trends of precipitation have been examined in the mid-Korean peninsula for the westerly condition only, along with the sensitivity simulations for a golden day (11 February 2009). During the long-term period, both precipitation amount (PA) and frequency (PF) in the downwind region (Chuncheon, Wonju, Hongcheon) of urban area significantly increased for the westerly and light precipitation (PA ≤ 1 ㎜ d?¹) cases, whereas PA and PF in the mountainous region (Daegwallyeong) decreased. The enhancement ratio of PA and PF for the downwind region vs. urban region remarkably increased, which implies a possible urbanization effect on downwind precipitation. In addition, the WRF simulation applied for one golden day demonstrates enhanced updraft and its associated convergence in the downwind area (about 60 ㎞), leading to an increase in the cloud mixing ratio. The sensitivity experiments with the change in surface roughness demonstrates a slight increase in cloud water mixing ratio but a negligible effect on precipitation in the upwind region, whereas those with the change in heat source represents the distinctive convergence and its associated updraft in the downwind region but a decrease in liquid water, which may be attributable to the evaporation of cloud droplet by atmospheric heating induced by an increase in an anthropogenic heat. In spite of limitations in the observation-based analysis and one-day simulation, the current result could provide an evidence of the effect of urbanization on the light precipitation in the downwind region.
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차주완(Joo Wan Cha),정운선(Wooseon Jung),채상희(Sanghee Chae),고아름(A-Reum Ko),노용훈(Yonghun Ro),장기호(Ki-Ho Chang),서성규(Seongkyu Seo),하종철(Jong-Chul Ha),박동오(Dongoh Park),황현준(Hyun Jun Hwang),김민후(Min Hoo Kim),김경익(Kyung 한국기상학회 2019 대기 Vol.29 No.4
National Institute of Meteorological Sciences has conducted a total 54 cloud seeding experiments with a silver iodide and calcium chloride using aircrafts from 2008 to 2018. The goal of the experiments is to improve the techniques of precipitation enhancement in Korea. The cloud seeding experiments using the silver iodide and calcium chloride were 36 and 18 times, respectively. During the cloud seeding experiments of the silver iodide and calcium chloride, the average values of total cloud amount for two kinds of seeding materials were 9.6 for and 8.1, respectively. The cloud type with the highest occurrence was Nimbostratus (Ns)-Stratus (St) (58%) in the silver iodide cloud seeding experiment. It was Altostratus (As)-Stratocumulus (Sc) (44%) in the calcium chloride cloud seeding experiment. Compared to probability of obtaining cloud seeding effect of the experiments using a leased aircraft, the probability using an atmospheric research aircraft increased from 43% to 63% in the silver iodide cloud seeding experiment and from 29% to 75% in the calcium chloride cloud seeding experiment. However, the increasing tendency was only shown during the one year experiment (2018). To get the meaningful statistical tendency of the cloud seeding effects, it is needed to implement many experiments in several years. Further we have to more clearly understand the characteristics of clouds developing in Korea and implement the cloud seeding experiments under a variety of weather conditions in order to develop the optimized precipitation enhancement technology in Korea.
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인공증우(설) 항공실험 분석 : 2019년 국제공동연구를 대상으로
구정모(Ku, Jung Mo),고아름(Ko, A-Reum),채상희(Chae, Sanghee),황현준(Hwang, Hyun Jun),노용훈(Ro, Yonghun),정운선(Jung, Woonseon) 한국방재학회 2020 한국방재학회논문집 Vol.20 No.6
본 연구에서는 항공기를 이용하여 수행된 인공증우(설) 국제공동연구(International Joint Cloud Observation and Weather Control Experiment 2019, IJCO-WCE 2019) 사례를 레이더 자료, 지상관측소 자료, 수치 모의 자료, 항공 관측 자료를 이용하여 인공증우(설) 효과를 분석하였다. 시딩 물질의 확산을 수치 모의한 결과, 시딩 물질은 항공기로 관측된 풍향과 일치한 방향으로 확산한것으로 나타났다. 항공기 관측자료를 분석한 결과에서는 구름 입자의 평균수농도와 강수 입자가 시딩 중보다 시딩 후에증가한 것을 확인할 수 있었다. 구름 입자 측정기(Cloud Droplet Probe, CDP)로 관측된 구름의 평균수농도는 시딩 중보다시딩 후에 약 59% 증가하였고, 구름 영상 측정기(Cloud Imaging Probe, CIP)로 관측된 구름의 평균수농도는 약 82% 증가하였다. 아울러 강수 입자 측정기(Precipitation Imaging Probe, PIP)로 관측된 강수 입자는 시딩 중에는 거의 관측되지 않았지만 시딩후에 관측됐다. In this study, an international joint cloud seeding experiment (International Joint Cloud Observation and Weather Control Experiment 2019, IJCO-WCE 2019) by aircraft was analyzed using numerical simulations, ground observation data, and aircraft observation data. As a result of numerical simulations, it was found that the seeding material was diffused in a direction consistent with the wind direction observed by the aircraft. Further, aircraft observation data showed an increase in average water concentration of clouds and precipitation particles after seeding rather than during seeding. The average water concentration of clouds observed by the Cloud Droplet Probe (CDP) increased by about 59% after seeding than during seeding, and that observed by the Cloud Imaging Probe (CIP) increased by about 82%. In addition, precipitation particles observed by the Precipitation Imaging Probe (PIP) were hardly noticed during seeding, but appeared after seeding.
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