学术
Time-Frequency Characteristics of the Relationships Between Tropical Indo-Pacific SSTs
Song YANG[1] 丁晓利[2] 郑大伟[3] Soo-Hyun YOO[4]
[1]NOAA ＇s Climate Prediction Center, 5200 Auth Road, Camp Springs, MD 20746, USA [2]Department of Land Surveying and Geo-Informatics, Hong Kong Polytechnic University [3]Center for Astrogeodynamics Research, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030 [4]RSIS/Climate Prediction Center, 5200 Auth Road, Camp Springs, MD 20746, USA
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文章出处:
《大气科学进展：英文版》-2007年24卷3期 -343-359页
分 类 号:
Time-Frequency Characteristics of the Relationships Between Tropical Indo-Pacific SSTs
Song YANG, DING Xiaoli, ZHENG Dawei,Soo-Hyun YOO（ 1NOAA ＇s Climate Prediction Center, 5200 Auth Road, Camp Springs, MD 20746, USA ;2Department of Land Surveying and Geo-Informatics, Hong Kong Polytechnic University;3 Center for Astrogeodynamics Research, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030;4 RSIS/Climate Prediction Center, 5200 Auth Road, Camp Springs, MD 20746, USA）
Abstract:
In this study, several advanced analysis methods are applied to understand the relationships between the Nino-3.4 sea surface temperatures （SST） and the SSTs related to the tropical Indian Ocean Dipole （IOD）. By analyzing a long data record, the authors focus on the time-frequency characteristics of these relationships, and of the structure of IOD. They also focus on the seasonal dependence of those characteristics in both time and frequency domains. Among the Nino-3.4 SST, IOD, and SSTs over the tropical western Indian Ocean （WIO） and eastern Indian Ocean （EIO）, the WIO SST has the strongest annual and semiannual oscillations. While the Nino-3.4 SST has large inter-annual variability that is only second to its annual variability, the IOD is characterized by the largest semiannual oscillation, which is even stronger than its annual oscillation. The IOD is strongly and stably related to the EIO SST in a wide range of frequency bands and in all seasons. However, it is less significantly related to the WIO SST in the boreal winter and spring. There exists a generally weak and unstable relationship between the WIO and EIO SSTs, especially in the biennial and higher frequency bands. The relationship is especially weak in summer and fall, when IOD is apparent, but appears highly positive in winter and spring, when the IOD is unimportantly weak and even disappears. This feature reflects a caution in the definition and application of IOD. The Nino-3.4 SST has a strong positive relationship with the WIO SST in all seasons, mainly in the biennial and longer frequency bands. However, it shows no significant relationship with the EIO SST in summer and fall, and with IOD in winter and spring.[著者文摘]
Key words:
Indian Ocean dipole, ENSO, time-frequency relationship, coherence analysis
基金资助:
Acknowledgements. The authors thank Prof. Li Chongyin and Drs. Huang Bohua, Xue Yan, and Zhang Qin for their constructive comments on an earlier version of the manuscript.
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