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The Relationship of Froude Number and Developed Cloud Band Locations Near Yeongdong Region Under the Siberian High Pressure System

시베리아 고기압 영향으로 영동지역 부근에서 발달한 구름대의 위치와 Froude 수와의 관계

  • Kim, Yu-Jin (Department of Atmospheric & Environmental Sciences, Gangneung-Wonju National University) ;
  • Kim, Man-Ki (Numerical Data Application Division, Numerical Modeling Center, Korea Meteorological Administration) ;
  • Lee, Jae Gyoo (Department of Atmospheric & Environmental Sciences, Gangneung-Wonju National University)
  • 김유진 (강릉원주대학교 대기환경과학과) ;
  • 김만기 (기상청 수치모델링센터) ;
  • 이재규 (강릉원주대학교 대기환경과학과)
  • Received : 2019.06.05
  • Accepted : 2019.08.28
  • Published : 2019.09.30

Abstract

Precipitation and no-precipitation events under the influence of the Siberian high pressure system in Yeondong region, were analysed and classified as four types [obvious precipitation event (OP) type, obvious no-precipitation event (ON) type, ambiguous precipitation event (AP) type and ambiguous no-precipitation event (AN) type], according to the easiness in determining whether to have precipitation or not in Yeongdong region, to help in improving the forecast skill. Concerning the synoptic pressure pattern, for OP type, the ridge of Siberian high extends from Lake Baikal toward Northeast China, and there is a northerly wind upstream of the northern mountain complex (located near the Korean-Chinese border). On the other hand, for ON type, the ridge of Siberian high extends southeastward from Lake Baikal, and there is a westerly wind upstream of the northern mountain complex. The pressure pattern of AP type was similar to the OP type and that of AN type was also similar to ON type. Thus it was difficult to differentiate AP type and OP type and AN type and ON type based on the synoptic pressure pattern only. The four types were determined by U (wind speed normal to the Taebaek mountains) and Froude number (FN). That is, for OP type, average FN and U at Yeongdong coast are ~2.0 and ${\sim}6m\;s^{-1}$, and those at Yeongseo region are 0.0 and $0.1m\;s^{-1}$, respectively. On the contrary, for ON type, average FN and U at Yeongdong coast are 0.0 and $0.2m\;s^{-1}$, and those at Yeongseo region are ~1.0 and ${\sim}4m\;s^{-1}$, respectively. For AP type, average FN and U at Yeongdong coast are ~1.0 and ${\sim}4m\;s^{-1}$, and those at Yeongseo region are 0.0 and $0.2m\;s^{-1}$, whereas for AN type, average FN and U at Yeongdong coast are 0.1 and $0.6m\;s^{-1}$ and those at Yeongseo region are ~1.0 and ${\sim}3m\;s^{-1}$, respectively. Based on the result, a schematic diagram for each type was suggested.

Keywords

Precipitation event type;Froude number;wind field;Yeongdong region;a schematic diagram

Acknowledgement

Grant : 기상업무지원기술개발연구, 재해기상 감시.분석.예측 기술 개발 및 활용연구

Supported by : 한국연구재단, 국립기상과학원

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