Nio海区冷暖事件的小波功率谱分析  

ANALYSIS ON WAVELET POWER SPECTRUM OF WARM AND COLD EVENTS IN THE NIO REGIONS

作　　者：孙卫国[1] 黄海仁[2] 程炳岩[3] 

机构地区：[1]南京信息工程大学,江苏南京210044 [2]海军海洋水文气象中心,北京100073 [3]河南省气候中心,河南郑州450003

出　　处：《热带气象学报》2005年第4期435-440,共6页Journal of Tropical Meteorology

摘　　要：根据NOAA/CPC发布的1950.1～2003.12期间Ni(n)o海区的SSTA资料,采用小波变换方法分析了SST变化的多时间尺度结构及其强度变化.结果表明,Nino各海区的SSTA序列表现出多层次相互嵌套的时频结构,经检验存在着2～7 a、8～20 a和30 a以上尺度的变化周期;10 a以上和1 a以下时间尺度的周期信号能量较弱,显著性变化周期的能量主要集中在2～7 a的周期振荡上;同一事件在不同海区的频率结构也不完全相同,冷暖事件的振荡能量和显著性水平从东向西有低频增大而高频减弱的变化趋势,时域中1970年以后尤为明显.On the basis of NOAA/CPC data of sea surface temperature anomaly in the Nino regions during 1950.1-2003.12, the wavelet power spectrum of SST were studied with significance and confidence testing at different scale 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-yr,8-20-yr and 〉30-yr. The most significant variation of the warm and cold events is in the 4-yr band of period. The power, frequency structure and confidence of the same event are different in different Nifio region. The intensity of oscillations is increasing at low frequency bands and decreasing at high frequency bands form east to west in the Nino regions, especially after 1970.

关 键 词：Nino海区 冷暖事件 小波功率谱 小波变换 SSTA序列 

分 类 号：P461.2[天文地球—大气科学及气象学]