대기 (Atmosphere)

  • 제25권3호
  • /
  • Pages.543-557
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  • 2015
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  • 1598-3560(pISSN)
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  • 2288-3266(eISSN)
한국기상학회 (Korean Meteorological Society)
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세 가지 재분석 자료에서의 겨울철 북반구 평균 자오면 순환-에디 상호작용

Mean Meridional Circulation-Eddy Interaction in Three Reanalysis Data Sets during the Boreal Winter

  • 문혜진 (부산대학교 지구환경시스템학부 대기과학전공) ;
  • 하경자 (부산대학교 지구환경시스템학부 대기과학전공)
  • Moon, Hyejin (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)
  • 투고 : 2015.04.29
  • 심사 : 2015.09.08
  • 발행 : 2015.09.30
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초록

The present study examines an interaction between the eddy and mean meridional circulation (MMC) comparing the results in three reanalysis data sets including ERA-Interim, NCEP2, and JRA-55 during the boreal winter in the Northern Hemisphere. It is noteworthy that the JRA-55 tends to produce stronger MMC compared to those of others, which is mainly due to the weak eddy flux. ERA-Interim represents the ensemble averages of MMC. The MMC-eddy interaction equation was adopted to investigate the scale interaction of the eddy momentum flux (EMF), eddy heat flux (EHF), and diabatic heating (DHT) with MMC. The EMF (EHF) shows a significant correlation coefficient with streamfunction under (above) 200 hPa-level. The perturbation (time mean) part of each eddy is dominant compared to another part in the EMF (EHF). The DHT is strongly interacted with streamfunction in the region between the equator and extra-tropical latitude over whole vertical column. Thus, the dominant term in each significant region modulates interannual variability of MMC. The inverse (proportional) relationship between MMC and pressure (meridional) derivative of the momentum (heat) divergence contributions is well represented in the three reanalysis data sets. The region modulated interannual variability of MMC by both EMF and DHT (EHF) is similar in ERA-Interim and JRA-55 (ERA-Interim and NCEP2). JRA-55 shows a lack of significant region of EHF due to the high resolution, compared to other data sets.

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피인용 문헌

  1. Eddy Momentum, Heat, and Moisture Transports During the Boreal Winter: Three Reanalysis Data Comparison vol.26, pp.4, 2016, https://doi.org/10.14191/Atmos.2016.26.4.649