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Volume 25 Issue 5

Sep.  2008

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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2008 >  25(5): 765-777

Snowstorm over the Southwestern Coast of the Korean Peninsula Associated with the Development of Mesocyclone over the Yellow Sea

  • 1.

    Division of Earth Environmental System, College of Natural Sciences, Pusan National University, Korea;Division of Earth Environmental System, College of Natural Sciences, Pusan National University, Korea


doi: 10.1007/s00376-008-0765-2

  • This study investigates the characteristics of a heavy snowfall event over the southwestern part of the Korean Peninsula on 4 December 2005. The snowstorm was a type of mesoscale maritime cyclone which resulted from barotropic instability, and diabatic heating from the warm ocean in continental polar air masses. Based on surface observations, radiosonde soundings, MTSAT-1R satellite data and the 10-km grid RDAPS (Regional Assimilation and Prediction System based on the PSU/NCAR MM5) data, the evolution of the mesocyclone is explained by the following dynamics; (1) In the initial stage, the primary role in the cyclogenesis process of the mesocyclone is a barotropic instability in the horizontal shear zone. (2) In the developing stage, the mesocyclone moves and deepens into a baroclinic zone corresponding to the surface heating and moistening. (3) In the mature stage, it is found that the mesocyclone is intensified by the destabilization caused by enhanced low-level heating and condensation, the moisture flux convergence, and the interaction between upper and lower-level potential vorticity anomalies. We suggest that a checklist with stepwise indicators responsible for development be prepared for the forecasting of heavy snowfall over the southwestern part of the Korean Peninsula.
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    • Manuscript History

    Manuscript received: 10 September 2008
    Manuscript revised: 10 September 2008
    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

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    Snowstorm over the Southwestern Coast of the Korean Peninsula Associated with the Development of Mesocyclone over the Yellow Sea

    • 1. Division of Earth Environmental System, College of Natural Sciences, Pusan National University, Korea;Division of Earth Environmental System, College of Natural Sciences, Pusan National University, Korea
    • Manuscript received: 2008-09-10
    • Manuscript revised: 2008-09-10

    Abstract: This study investigates the characteristics of a heavy snowfall event over the southwestern part of the Korean Peninsula on 4 December 2005. The snowstorm was a type of mesoscale maritime cyclone which resulted from barotropic instability, and diabatic heating from the warm ocean in continental polar air masses. Based on surface observations, radiosonde soundings, MTSAT-1R satellite data and the 10-km grid RDAPS (Regional Assimilation and Prediction System based on the PSU/NCAR MM5) data, the evolution of the mesocyclone is explained by the following dynamics; (1) In the initial stage, the primary role in the cyclogenesis process of the mesocyclone is a barotropic instability in the horizontal shear zone. (2) In the developing stage, the mesocyclone moves and deepens into a baroclinic zone corresponding to the surface heating and moistening. (3) In the mature stage, it is found that the mesocyclone is intensified by the destabilization caused by enhanced low-level heating and condensation, the moisture flux convergence, and the interaction between upper and lower-level potential vorticity anomalies. We suggest that a checklist with stepwise indicators responsible for development be prepared for the forecasting of heavy snowfall over the southwestern part of the Korean Peninsula.

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