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Korean Meteorological Society (한국기상학회)
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Effect of Sea Surface Temperature Gradient Induced by the Previous Typhoon's Cold Wake on the Track of the Following Typhoon: Bolaven (1215) and Tembin (1214)

선행 태풍의 해수 냉각에 의한 해수면 온도 경도가 후행 태풍의 진로에 미치는 영향: 볼라벤(1215)과 덴빈(1214)

  • Moon, Mincheol (Department of Atmospheric Sciences, Division of Earth Environmental System, Pusan National University) ;
  • Choi, Yumi (Department of Atmospheric Sciences, Division of Earth Environmental System, Pusan National University) ;
  • Ha, Kyung-Ja (Department of Atmospheric Sciences, Division of Earth Environmental System, Pusan National University)
  • 문민철 (부산대학교 지구환경시스템학부 대기과학전공) ;
  • 최유미 (부산대학교 지구환경시스템학부 대기과학전공) ;
  • 하경자 (부산대학교 지구환경시스템학부 대기과학전공)
  • Received : 2016.08.12
  • Accepted : 2016.12.06
  • Published : 2016.12.31
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Abstract

The effects of sea surface temperature (SST) gradient induced by the previous typhoon on the following typhoon motion over East Asia have been investigated using Weather Research and Forecasting (WRF) model for the previous Typhoon Bolaven (1215) and following Typhoon Tembin (1214). It was observed that Typhoon Bolaven remarkably reduced SST by about $7^{\circ}C$ at Yellow Sea buoy (YSbuoy). Using the WRF experiments for the imposed cold wake over West of Tembin (WT) and over East of Tembin (ET), this study demonstrates that the effects of eastward SST gradient including cold wake over WT is much significant rather than that over ET in relation to unexpected Tembin's eastward deflection. This difference between two experiments is attributed to the fact that cold wake over WT increases the magnitude of SST gradient under the eastward SST gradient around East Asia and the resultant asymmetric flow deflects Typhoon Tembin eastward, which is mainly due to the different atmospheric response to the SST forcing between ET and WT. Therefore, it implies that the enhanced eastward SST gradient over East Asia results in larger typhoon deflection toward the region of warmer SST according to the location of the cold wake effect. This result can contribute to the improvement of track prediction for typhoons influencing the Korean Peninsula

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References

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