영동 대설사례의 레이더 강설강도 추정 관계식에 관한 연구
A Study on the Radar Reflectivity-Snowfall Rate Relation for Yeongdong Heavy Snowfall Events
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다운로드
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참고문헌
키워드
초록
Heavy snowfall events have occurred frequently in the Yeongdong region but understanding of these events have trouble in lack of snowfall observation in this region because it is composed of complex topography like the “Taebaek mountains” and the “East sea”. These problems can be solved by quantitative precipitation estimation technique using remote sensing such as radar, satellite, etc. Two radars which are able to cover over Yeondong region were installed at Gangneung (GNG) and Gwangdeoksan (GDK). This study uses radar and water equivalent of snow cover to investigate the characteristics of radar echoes and the Ze-R relations associated with the 10 Yeongdong heavy snowfall events during the last 5 years (2010~2014). It was found that the heights which the probability of detection (POD) of snow detection by GNG radar is more than 80% are 3,000 m and 1,500 m in convective cloud and stratiform cloud, respectively. The vertical gradient of radar reflectivity is less decreased in convective cloud than stratiform cloud. However, POD by GDK radar are lower than 80% at all layers because the majority of Yeondong observational stations are more than 100 km away from GDK radar site. Furthermore, we examined Ze-R relation from the 10 events using GNG radar and compared the “a” and “b” obtained from these examinations at Sokcho (SC) and Daegwallyeong (DG). These “a” and “b” are estimated from radar echo at 500 m (SC) and 1,500 m (DG). The values of “a” differ in their stations such as SC and DG are 30~116 and 6~39, respectively. But “b” is 0.4~1.7 irrespective of stations. Moreover, the value of “a” increased with surface air temperature. Therefore, quantitative precipitation estimation in heavy snowfall events by radar echo using fixed “a” and “b” is difficult because these values changed according to those precipitation characteristics.
Abstract
Heavy snowfall events have occurred frequently in the Yeongdong region but understanding of these events have trouble in lack of snowfall observation in this region because it is composed of complex topography like the “Taebaek mountains” and the “East sea”. These problems can be solved by quantitative precipitation estimation technique using remote sensing such as radar, satellite, etc. Two radars which are able to cover over Yeondong region were installed at Gangneung (GNG) and Gwangdeoksan (GDK). This study uses radar and water equivalent of snow cover to investigate the characteristics of radar echoes and the Ze-R relations associated with the 10 Yeongdong heavy snowfall events during the last 5 years (2010~2014). It was found that the heights which the probability of detection (POD) of snow detection by GNG radar is more than 80% are 3,000 m and 1,500 m in convective cloud and stratiform cloud, respectively. The vertical gradient of radar reflectivity is less decreased in convective cloud than stratiform cloud. However, POD by GDK radar are lower than 80% at all layers because the majority of Yeondong observational stations are more than 100 km away from GDK radar site. Furthermore, we examined Ze-R relation from the 10 events using GNG radar and compared the “a” and “b” obtained from these examinations at Sokcho (SC) and Daegwallyeong (DG). These “a” and “b” are estimated from radar echo at 500 m (SC) and 1,500 m (DG). The values of “a” differ in their stations such as SC and DG are 30~116 and 6~39, respectively. But “b” is 0.4~1.7 irrespective of stations. Moreover, the value of “a” increased with surface air temperature. Therefore, quantitative precipitation estimation in heavy snowfall events by radar echo using fixed “a” and “b” is difficult because these values changed according to those precipitation characteristics.
참고문헌 (19)
- Brown, R. A., "Improved detection using negative elevation angles for mountaintop WSR-88Ds: Simulation of KMSX near Missoula, Montana", Wea. Forecasing, 17, pp.223~237 (2002)
- Cho, Y. -H., "Characteristics of microphysical process in snowfall case in Yeongdong region", Proc., the Autumn meeting of Korea Meteor. Soc., 10, pp.162~163 (2009)
- 조영준, "영동지역의 극한 대설에 대한 위성관측으로부터 구름 추적", 대한원격탐사학회지, 30(1), pp.83~107 (2014), 대한원격탐사학회[DOI]
- Cooper, W. A., "Precipitation Enhancement: A Scientific Challenge", pp.29~32 (1986), American Meteorological Society
- Fujiyoshi, Y., "Determination of a ZR relationship for snowfall using a radar and high sensitivity snow gauges", J. Appl. Meteor. Climatol, 29, pp.147~152 (1990)
- Imai, J., "Raindrop size distributions and the Z-R relationship", Proc. Eighth Weather Radar Conf., pp.321~326 (1960), Amer. Meteor. Soc.
- Kim, B. -W., "Correlation between snowfall amount and Radar echo: about Westerly", Atmosphere, 12, pp.126~129 (2002)
- 권태영, "영동 대설과 관련된 낮은 층운형 구름의 위성관측", 대기, 25(4), pp.577~589 (2015), 한국기상학회
- Marshall, J. S., "Measurement of snow parameters by radar", J. Meteor, 9, pp.322~327 (1952)
- Meyers, M. P., "New primary ice-nucleation parameterizations in an explicit cloud model", J. Appl. Meteor, 31, pp.708~721 (1992)
- Research for radar snowfall rate estimation and new technologies of next generation radar, "National Institute of Meteorological Sciences", 105~ (2014)
- Establishment and operation of high impact weather research center (IV), "National Institute of Meteorological Sciences", 623~ (2014)
- 박소라, "단일편파 레이더자료 품질관리기술 특성 분석", 대기, 24(1), pp.77~87 (2014), 한국기상학회
- Puhakka, T., "On the dependence of the Z-R relation on the temperature in snowfall", 16th Conf. on Radar Meteorology, pp.504~507 (1975), Amer. Meteor. Soc
- Rasmussen, R., "Snow nowcasting using a real-time correlation of radar reflectivity with snow gauge accumulation", J. Appl. Meteor, 42, pp.20~36 (2003)
- Sekhon, R. S., "Snow size spectra and radar reflectivity", J. Atmos. Sci., 27, pp.299~307 (1970)
- Wetzel, M., "Mesoscale snowfall prediction and verification in mountainous terrain", Wea. Forecasting, 19, pp.806~828 (2004)
- Wolfe, J. P., "A relationship between reflectivity and snow rate for high-altitude S-band radar", J. Appl. Meteor. Climatol., 51, pp.1111~1128 (2012)
- Wood, V. T., "Improved detection using negative elevation angles for mountaintop WSR-88Ds. Part II: Simulations of the three radars covering Utah", Wea. Forecasting, 18, pp.393~403 (2003)