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논문 기본 정보

자료유형
학위논문
저자정보

김선용 (한국해양대학교, 한국해양대학교 해양과학기술전문대학원)

발행연도
2015
저작권
한국해양대학교 논문은 저작권에 의해 보호받습니다.

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이 논문의 연구 히스토리 (5)

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Though tropical SST anomalies associated with El Nino change slowly during the mature phase of El Nino, the resultant extratropical teleconnection patterns are quite different with time. In this study, the intra-winter changes in the teleconnection pattern associated with El Nino are investigated using the NCEP reanalysis and observational data and the high-resolution seasonal prediction data. The observational analyses show that there are distinctively changes in the teleconnection pattern over the North Pacific within the winter. In the early winter (November-December) of El Nino years, there is a distinctive anomalous Kuroshio anticyclone, which is closely related to the East Asian climate. In January, in contrast, the Kuroshio anticyclone suddenly disappears and a strong cyclonic flow, which is part of the Pacific-North American (PNA) teleconnection pattern, develops. It is suggested that the intra-winter changes are controlled by the relative roles of the equatorial central Pacific (CP) and western north Pacific (WNP) precipitation anomalies on the extratropical teleconnection over the North Pacific. On the other hand, the prediction data failed to capture the observed intra-winter changes in the teleconnection pattern, though the predictive skills for tropical SST and precipitation are high. It is revealed that this model’s discrepancy in the extratropical teleconnection is partly originated from the failure in predicting the relative magnitude of CP and WNP precipitation anomalies. Further analyses on the ensemble spread of the prediction data support the relative roles of CP and WNP precipitation anomalies in affecting the extratropical circulation over the North Pacific.

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Contents
List of Figures
Abstract
1. Introduction
2. Data and model
2.1 GloSea5 model
2.2 Reanalysis and Oobservation data
3. Verification of the prediction skill
4. Teleconnection overto East Asia and North Pacific
5. Teleconnection difference from ensemble spread
6. Climatological field in tropics and extratropics
7. Summary and discussion
References

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