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Korean Meteorological Society (한국기상학회)
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Analysis for Onset of Changma Using Ieodo Ocean Research Station Data

이어도 기상 관측 자료를 활용한 장마 시작일 분석

  • Oh, Hyoeun (Division of Earth Environmental System, Pusan National University) ;
  • Ha, Kyung-Ja (Division of Earth Environmental System, Pusan National University) ;
  • Shim, Jae-Seol (Operational Ocean Science and Technology Department, Korea Institute of Ocean Science and Technology)
  • 오효은 (부산대학교 지구환경시스템학부 대기과학전공) ;
  • 하경자 (부산대학교 지구환경시스템학부 대기과학전공) ;
  • 심재설 (한국해양과학기술원)
  • Received : 2014.01.09
  • Accepted : 2014.02.28
  • Published : 2014.06.30
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Abstract

The definition of onset date of Changma is revisited in this study using a quality controlled Ieodo ocean research station data. The Ieodo station has great importance in terms of its southwest location from Korean Peninsula and, hence, makes it possible to predict Changma period in advance with less impact of continents. The onset date of Changma using the Ieodo station data is defined by the time that meridional wind direction changes and maintains from northerly to southerly, and then the zonal wind changes from easterly to westerly after first June. This definition comes from a recognition that the establishment and movement of the western North Pacific subtropical high (WNPSH) cause Changma through southwesterly flow. The onset data of Changma has been determined by large-scale dynamic-thermodynamic characteristics or various meteorological station data. However, even the definition based on circulation data at the Ieodo station has a potential for the improved prediction skill of the onset date of Changma. The differences between before and after Changma, defined as Ieodo station data, are also found in synoptic chart. The convective instability and conspicuous circulations, corresponding low-level southwesterly flow related to WNPSH and strong upper-level zonal wind, are represented during Changma.

Keywords

References

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  3. Impacts of SST Pattern Represented by Ocean Temperature near Ieodo Ocean Research Station on Winter Climate Variation over the Korean Peninsula pp.1976-7951, 2019, https://doi.org/10.1007/s13143-019-00146-5