한국에서 발생한 청천난류 사례에서 나타나는 종관규모 대기상태에 대한 연구
An Investigation of Synoptic Condition for Clear-Air Turbulence (CAT) Events Occurred over South Korea
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초록
The synoptic condition of clear-air turbulence (CAT) events occurred over South Korea is investigated, using the Regional Data Assimilation and Prediction System (RDAPS)data obtained from the Korea Meteorological Agency (KMA) and pilot reports (PIREPs)collected by Korea Aviation Meteorological Agency (KAMA) from 1 Dec. 2003 to 30 Nov. 2008. Throughout the years, strong subtropical jet stream exists over the South Korea, and the CAT events frequently occur in the upper-level frontal zone and subtropical jet stream regions where strong vertical wind shears locate. The probability of the moderate or greater (MOG)-level turbulence occurrence is higher in wintertime than in summertime, and high probability region is shifted northward across the jet stream in wintertime. We categorize the CAT events into three types according to their generation mechanisms: i) upper-level front and jet stream, ii)anticyclonically sheared and curved flows, and iii) breaking of mountain waves. Among 240MOG-level CAT events reported during 2003-2008, 103 cases are related to jet stream while 73cases and 25 cases are related to the anticyclonic shear flow and breaking of mountain wave,respectively.
Abstract
The synoptic condition of clear-air turbulence (CAT) events occurred over South Korea is investigated, using the Regional Data Assimilation and Prediction System (RDAPS)data obtained from the Korea Meteorological Agency (KMA) and pilot reports (PIREPs)collected by Korea Aviation Meteorological Agency (KAMA) from 1 Dec. 2003 to 30 Nov. 2008. Throughout the years, strong subtropical jet stream exists over the South Korea, and the CAT events frequently occur in the upper-level frontal zone and subtropical jet stream regions where strong vertical wind shears locate. The probability of the moderate or greater (MOG)-level turbulence occurrence is higher in wintertime than in summertime, and high probability region is shifted northward across the jet stream in wintertime. We categorize the CAT events into three types according to their generation mechanisms: i) upper-level front and jet stream, ii)anticyclonically sheared and curved flows, and iii) breaking of mountain waves. Among 240MOG-level CAT events reported during 2003-2008, 103 cases are related to jet stream while 73cases and 25 cases are related to the anticyclonic shear flow and breaking of mountain wave,respectively.
참고문헌 (32)
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