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THE FREQUENCY CHARACTERISTICS OF WARM AND COLD EPISODES IN THE NIO REGIONS 被引量:9

THE FREQUENCY CHARACTERISTICS OF WARM AND COLD EPISODES IN THE NIO REGIONS
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摘要 On the basis of NOAA/CPC data of sea surface temperature anomaly in the Nifio regions during Jan. 1950 - Dec. 2003, the wavelet power spectrum of SST were studied with significance and confidence testing at different scales in this paper. It shows that the SST are provided with multi-time scales structure nested one another, and vary on scales of 2 - 7 years, 8 - 20 years and 〉30 years. The most significant variation of the warm and cold episodes is in the 4-year band of period. The power, frequency structure and confidence of the same episode are different in different Nino regions. The intensity of oscillations is increasing at low frequency bands and decreasing at high frequency bands from east to west in the Nino regions, especially after 1970. On the basis of NOAA/CPC data of sea surface temperature anomaly in the Nio regions during Jan. 1950 – Dec. 2003, the wavelet power spectrum of SST were studied with significance and confidence testing at different scales in this paper. It shows that the SST are provided with multi-time scales structure nested one another, and vary on scales of 2 – 7 years, 8 – 20 years and >30 years. The most significant variation of the warm and cold episodes is in the 4-year band of period. The power, frequency structure and confidence of the same episode are different in different Nio regions. The intensity of oscillations is increasing at low frequency bands and decreasing at high frequency bands from east to west in the Ni?o regions, especially after 1970.
出处 《Journal of Tropical Meteorology》 SCIE 2005年第2期200-205,共6页 热带气象学报(英文版)
关键词 Nino regions warm and cold episodes wavelet power spectrum 海洋气象 气候变化 冷热交替 SST 大气循环
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