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RISS 인기검색어
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- 저자 : 성대경(Dae-Kyeong Seong) (검색결과 2 건)
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대설관측실험(Experiment on Snow Storms At Yeongdong: ESSAY) 기간 중 두 제조사 라디오존데 기온과 습도 센서 상호 비교
서원석(Won-Seok Seo),은승희(Seung-Hee Eun),김병곤(Byung-Gon Kim),성대경(Dae-Kyeong Seong),이규민(Gyu-Min Lee),전혜림(Hye-Rim Jeon),최병철(Byoung-Cheol Choi),고아름(A-reum Ko),장기호(Ki-Ho Chang),양승구(Seung-Gu Yang) 한국기상학회 2016 대기 Vol.26 No.2
Radiosonde is an observation equipment that measures pressure (geopotential height), temperature, relative humidity and wind by being launched up from the ground. Radiosonde data which serves as an important element of weather forecast and research often causes a bias in a model output due to accuracy and sensitivity between the different manufacturers. Although Korean Meteorological Administration (KMA) and several institutes have conducted routine and intensive radiosonde observations, very few studies have been done before on the characteristics of radiosonde performance. Analyzing radiosonde observation data without proper understanding of the unique nature of those sensors may lead to a significant bias in the analysis of results. To evaluate performance and reliability of radiosonde, we analyzed the differences between two sensors made by the different manufacturers, which have been used in the campaign of Experiment on Snow Storm At Yeongdong (ESSAY). We improved a couple of methods to launch the balloon being attached with the sensors. Further we examined cloudlayer impacts on temperature and humidity differences for the analysis of both sensors’ performance among various weather conditions, and also compared daytime and nighttime profiles to understand temporal dependence of meteorological sensors. The overall results showed that there are small but consistent biases in both temperature and humidity between different manufactured sensors, which could eventually secure reliable precisions of both sensors, irrespective of accuracy. This study would contribute to an improved sounding of atmospheric vertical states through development and improvement of the meteorological sensors.
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2014년 대설관측실험(Experiment on Snow Storms At Yeongdong: ESSAY)기간 강설 및 눈결정 특성분석
서원석(Won-Seok Seo),은승희(Seung-Hee Eun),김병곤(Byung-Gon Kim),고아름(A-Reum Ko),성대경(Dae-Kyeong Seong),이규민(Gyu-Min Lee),전혜림(Hye-Rim Jeon),한상옥(Sang-Ok Han),박영산(Young-San Park) 한국기상학회 2015 대기 Vol.25 No.2
Characteristics of snowfall and snow crystal habits have been investigated in the campaign of Experiment on Snow Storms At Yeongdong (ESSAY) using radiosonde soundings, Global Navigation Satellite System (GNSS), and a digital camera with a magnifier for taking a photograph of snowfall crystals. The analysis period is 6 to 14 February 2014, when the accumulated snowfall amount is 192.8 cm with the longest snowfall duration of 9 days. The synoptic situations are similar to those of the previous studies such as the Low pressure system passing by the far South of the Korean peninsula along with the Siberian High extending to northern Japan, which eventually results in the northeasterly or easterly flows and the long-lasting snowfall episodes in the Yeongdong region. In general, the ice clouds tended to exist below around 2~3 km with the consistent easterly flows, and the winds shifted to northerly~ northwesterly above the clouds layer. The snow crystal habits observed in the ESSAY campaign were mainly dendrite, consisting of 70% of the entire habits. The rimed habits were frequently captured when two-layered clouds were observed, probably through the process of freezing of super-cooled droplets on the ice particles. The homogeneous habit such as dendrite was shown in case of shallow clouds with its thickness of below 500 m whereas various habits were captured such as dendrites, rimed dendrites, aggregates of dendrites, plates, rimed plates, etc in the thick cloud with its thickness greater than 1.5 km. The dendrites appeared to be dominant in the condition of cloud top temperature specifically ranging ?12 ~ ?16℃. However, the association of snow crystal habits with temperature and super-saturation in the cloud could not be examined in the current study. Better understandings of characteristics of snow crystal habits would contribute to preventing breakdown accidents such as a greenhouse destruction and collapse of a temporary building due to heavy snowfall, and traffic accidents due to snow-slip-pery road condition, providing a higher-level weather information of snow quality for skiers participating in the winter sports, and estimating more accurate snowfall amount, location, and duration with the fallspeed of solid precipitation.
ScienceON
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