S-Space College of Natural Sciences (자연과학대학) Dept. of Earth and Environmental Sciences (지구환경과학부) Journal Papers (저널논문_지구환경과학부)
2011년 1월의 동아시아 한랭 아노말리 특성
Characteristic Features Observed in the East-Asian Cold Anomalies in January 2011
- 최우갑; 정지연; 전종갑
- Issue Date
- 대기, Vol.23 No.4, pp. 401-412
- East Asia experienced extremely cold weather in January 2011, while the previousDecember and the following February had normal winter temperature. In this study NationalCenters for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis data are used to investigate the characteristic features observed in the meteorologicalfields such as temperature, sea-level pressure, geopotential height, and wind duringthis winter period. In January the planetary-wave pattern is dominated by stationary-wave formin the mid-to-high latitude region, while transient waves are significant in the previous month.To understand the planetary-wave features quantitatively, harmonic analyses have been donefor the 500-hPa geopotential height field. In the climatological-mean geopotential heights thewave numbers 1, 2, and 3 are dominant during the whole winter. In January 2011 the waves ofnumber 1, 2, and 3 are dominant and stationary as in the climatological-mean field. In December2010 and February 2011, however, the waves of number 4, 5, and 6 play a major role andshow a transient pattern. In addition to the distinctive features in each month the planetarywavepatterns dependent on the latitude are also discussed.