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Korean Meteorological Society (한국기상학회)
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Relationship between the East-Asian Cold Anomalies in Winter of 2010/11 and Blocking

2010/11년 겨울의 동아시아 한랭 아노말리와 블로킹의 연관성

  • Choi, Wookap (School of Earth and Environmental Sciences, Seoul National University) ;
  • Kim, Young-Ah (School of Earth and Environmental Sciences, Seoul National University)
  • 최우갑 (서울대학교 지구환경과학부) ;
  • 김영아 (서울대학교 지구환경과학부)
  • Received : 2016.01.22
  • Accepted : 2016.02.25
  • Published : 2016.03.31
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Abstract

An anomalous cold-weather period occurred during January 2011 in East Asia, and this study investigates the event by focusing on the blocking phenomena formed at Northeastern Asia. The area of cold weather is determined to represent the characteristic features of abnormal cold temperature. The 2010/11 winter is divided into three periods P1, P2 (cold period), and P3. For the cold area ($30-50^{\circ}N$, $115-135^{\circ}E$) the corresponding cold period P2 is determined to be 39 days from 23 December 2010 through 30 January 2011. During P1 and P3 temperature anomalies from the climatological mean are small with large standard deviation compared to those of P2, which has large negative anomaly and small standard deviation. The period P2 is dominated by blocking, which was determined by distributions of 500-hPa geopotential height and potential temperature on the 2 PVU surface. Correlation-coefficient analyses show that during P2 the temperature in the cold area is related with pressure of Northeastern Asia, while the temperature during P1 and P3 is related with pressure of Northwest of Korea. Also, during P1 and P3 the temperature pattern shows eastward propagation, but during P2, a stationary pattern. All the observations imply that, during the cold period P2, the temperature in the cold area is related with blocking in Northeastern Asia. During P1 and P3 temperature pattern is related with 500-hPa geopotential height in Siberia, and this relationship is also observed in the climatological mean state.

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References

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