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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.
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초록· 키워드
오류제보하기
The time-series of Walker circulation index (WCI) in this study shows the strengthening of the Walker circulation in recent years. To further understand the large-scale features related to the WCI strengthening, a difference between the averaged meteorological variables in two time periods 1999-2013 and 1984-1998 is analyzed. The difference in 850 hPa stream flows between the two periods shows that the anomalous easterlies (anomalous trade wind) are dominant due to the strengthening of anomalous anticyclonic circulations at the subtropical Pacific of both hemispheres. The difference between the averaged zonal atmospheric circulations over $5^oS-5^oN$ in the two periods confirms that upward flows are strengthened at the tropical western Pacific and downward flows are strengthened at the tropical central and eastern Pacific in recent years. It matches the WCI strengthening in recent years. The time-series of tropical cyclone (TC) genesis frequency from July to September shows that a mean TC genesis frequency from 1999-2013 decreases compared to that of the time period 1984-1998. The monsoon trough in the period 1984-1998 was located in the further east direction and stronger than that in the period 1999-2013. TCs in the recent period that are generated in further west than TCs in the past period moved from the west. Thus, the TC intensity along the coasts in East Asia becomes weaker in recent period. The intensification of Walker circulation in recent years is related to the weaker TC intensity in East Asia through strengthened anomalous anticyclones at the subtropical western Pacific.
목차
등록된 정보가 없습니다.
참고문헌 (46)
참고문헌 신청
Allan, R. J. / 1996 / El Niño : Southern Oscillation and Climatic Variability / CSIRO Publishing :405
Bouma, M.J. / 1997 / Cycles of malaria associated with El Niño in Venezuela / Journal of American Medicine Association 278:1772~1774
R. J. Burgman / 2008 / Evidence for atmospheric variability over the Pacific on decadal timescales / Geophysical Research Letters 35(1)
Jeff Callaghan / 2011 / Variability and decline in the number of severe tropical cyclones making land-fall over eastern Australia since the late nineteenth century / Climate Dynamics 37(3-4):647~662
Chan, J. C. L. / 1982 / Tropical cyclone movement and surrounding flow relationships / Monthly Weather Review 110:1354~1374
Bouma, M.J. / 1997 / Cycles of malaria associated with El Niño in Venezuela / Journal of American Medicine Association 278:1772~1774
R. J. Burgman / 2008 / Evidence for atmospheric variability over the Pacific on decadal timescales / Geophysical Research Letters 35(1)
Jeff Callaghan / 2011 / Variability and decline in the number of severe tropical cyclones making land-fall over eastern Australia since the late nineteenth century / Climate Dynamics 37(3-4):647~662
Chan, J. C. L. / 1982 / Tropical cyclone movement and surrounding flow relationships / Monthly Weather Review 110:1354~1374
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