Characteristics of Tropical Cyclogenesis over the Western North Pacific in 2007

2007년 북서태평양에서의 열대저기압 발생 특징

  • Choi, Ki-Seon (National Institute of Meteorological Research, Korea Meteorological Adminstration) ;
  • Kim, Baek-Jo (National Institute of Meteorological Research, Korea Meteorological Adminstration) ;
  • Lee, Seong-Lo (Department of Civil Engineering, Mokpo National University) ;
  • Kim, Ho-Kyung (Department of Civil Engineering, Mokpo National University) ;
  • Park, Jong-Kil (School of Environmental Sciences Engineering, Atmospheric Environment Information Research Center, Inje University) ;
  • Lee, Ji-Sun (Department of Environmental Atmospheric Sciences, Pukyong National University)
  • Published : 2009.05.31


This study found that tropical cyclones (TCs) formed for fall in 2007 over the western North Pacific were distributed in high-latitudes comparing to 56-year (1951-2006) climatological mean. The frequency and latitude of TC genesis became higher than 56-year climatological mean from September onward in 2007 and all the TCs that formed to the north of 20$^{\circ}$N was also distributed after September in 2007. These characteristics of TC genesis for fall in 2007 could be confirmed through analyzing various variables, such as a large-scale atmospheric circulation, outgoing longwave radiation (OLR), vertical zonal wind shear, and sea surface temperature (SST). On the other hand, a frequency of the TC that occurred to the north of 200N showed a clear interdecadal variation and its decreasing trend was distinctive in recent years. Its intensity was also weaker that TCs that did to the south of 20$^{\circ}$N. However, a latitude of TC genesis showed an increasing trend until recent years, whose variation was consistent with trend that through a SST analysis, warm SST went north in recent years.


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