P1.29
Regional characteristics of the decadal and interdecadal variations for global temperature field during the last century
Zhihong Jiang, Nanjing Institute of Meteorology, Nanjing, Jiangsu, China
On the basis of Multi-Taper spectral analysis, the detections and reconstructions are carried out in regional mean temperature time series, especially in analysis of the teleconnections of the decadal and interdecadal variations among the different region. The propagation of interdecadal oscillation was also preliminary investigated. Results shows that there are different time scales of significant low-frequency oscillations with periods about 70yr, 30°«50yr, 20°«30yr, 15yr, and 7°«10yr respectively. Oscillation with the period around 70 years is found in the extra-tropical ocean of Northern Hemisphere, particularly in northwest Atlantic. The 30°«50-yr oscillation exists throughout most part region of global, except for partial mid-latitude ocean, with similar change in different region. It is also displayed in the global mean temperature series. The 20°«30-yr oscillation is found in the mid-latitude and subtropical ocean, which seem propagates along the subtropical ocean circulation. Decadal oscillation exhibits in the tropical and equatorial Pacific, west tropical Atlantic and mid-latitude Eurasia with periods °Ö 15, 7°«10 yr, respectively. The phase of the former oscillation for low-latitude Pacific is basically in contrast to that of 20°«30-yr oscillation for mid-latitude north Pacific.
Poster Session 1, Climate Modeling and Observed Climate Change (Hall 4AB)
Tuesday, 13 January 2004, 9:45 AM-11:00 AM, Hall 4AB
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