지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국기상학회 Asia-Pacific Journal of Atmospheric Sciences Asia-Pacific Journal of Atmospheric Sciences Vol.45 No.4
- 발행연도
- 2009.11
- 수록면
- 483 - 498 (16page)
이용수
초록· 키워드
오류제보하기
The intraseasonal time dependency of eddy-mean flow interaction is examined during boreal summer using the interannual variability of Bonin high index (BHI) for 44 years (1958-2001). The perturbation kinetic energy (PKE), localized Eliassen-Palm (E-P) fluxes and barotropic energy conversion (BEC) are analyzed with a comparison in July and August. The results in strong July (SJ) years (＞1.0σ in normalized BHI) show that the 200 hPa PKE, particularly PKE of high frequency (HF; 2-9 day) eddy, is enhanced along the westerly jet, while eddy activities are reduced over the western North Pacific. This implies that the strong Bonin high is related to the weak eddy activity over that region. The meridional shear of strong westerly jet associated with the BEC from eddy to basic flow makes anticyclonic circulation over the south of Japan. In terms of the localized E-P flux, eddies tend to accelerate and decelerate the westerly flow over the north and south of the East Asian jet, respectively. Consequently, the barotropically unstable effect by the meridional shear
of time-mean zonal flow and the deceleration of mean westerly flow by actions of transients are responsible for the anticyclonic circulation over the south of Japan in SJ years. The contributions of low frequency (LF; 10-60 day) eddy to the effects of BEC and localized E-P flux are larger than HF eddy. However, the characteristics of PKE, BEC and localized E-P flux appeared in SJ years are not found in strong August (SA) years, indicating that the development of Bonin high during August is not closely related to the local eddy-mean flow interaction. This interaction during July is more effective in developing the Bonin high than during August.
of time-mean zonal flow and the deceleration of mean westerly flow by actions of transients are responsible for the anticyclonic circulation over the south of Japan in SJ years. The contributions of low frequency (LF; 10-60 day) eddy to the effects of BEC and localized E-P flux are larger than HF eddy. However, the characteristics of PKE, BEC and localized E-P flux appeared in SJ years are not found in strong August (SA) years, indicating that the development of Bonin high during August is not closely related to the local eddy-mean flow interaction. This interaction during July is more effective in developing the Bonin high than during August.
목차
Abstract
1. Introduction
2. Data
3. Comparison of July and August climate
4. Eddy-mean flow interaction
5. Summary and discussion
REFERENCES
참고문헌 (32)
참고문헌 신청
1. [학술지(정기간행물)] - Blackmon, M. L / 1977 / An observational study of the northern hemisphere wintertime circulation / J. Atmos. Sci 34 : 1040 ~ 1053
2. [학술지(정기간행물)] - Cai, M / 2007 / Dynamical implications of the orientation of atmospheric eddies: a local energetics perspective / Tellus 59A : 127 ~ 140
3. [학술지(정기간행물)] - Enomoto, T / 2004 / Interannual variability of the Bonin high associated with the propagation of Rossby waves along the Asian jet / J. Meteor. Soc. Japan 82 : 1019 ~ 1034
4. [학술지(정기간행물)] - Enomoto, T / 2003 / The formation mechanism of the Bonin high in August / Quart. J. Roy. Meteor. Soc 129 : 157 ~ 178
5. [학술지(정기간행물)] - Enomoto, T. / 2009 / Relationship between high-impact weather events in Japan and propagation of Rossby waves along the Asian jet in July 2004 / J. Meteor. Soc. Japan 87 : 139 ~ 156
2. [학술지(정기간행물)] - Cai, M / 2007 / Dynamical implications of the orientation of atmospheric eddies: a local energetics perspective / Tellus 59A : 127 ~ 140
3. [학술지(정기간행물)] - Enomoto, T / 2004 / Interannual variability of the Bonin high associated with the propagation of Rossby waves along the Asian jet / J. Meteor. Soc. Japan 82 : 1019 ~ 1034
4. [학술지(정기간행물)] - Enomoto, T / 2003 / The formation mechanism of the Bonin high in August / Quart. J. Roy. Meteor. Soc 129 : 157 ~ 178
5. [학술지(정기간행물)] - Enomoto, T. / 2009 / Relationship between high-impact weather events in Japan and propagation of Rossby waves along the Asian jet in July 2004 / J. Meteor. Soc. Japan 87 : 139 ~ 156
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UCI(KEPA) : I410-ECN-0101-2009-453-019158785