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20世纪全球温度年代和年代际变化的区域特征
Regional Characteristics of the Decadal and Interdecadal Variations for Global Temperature Field during the Last Century
【摘要】 利用多窗谱方法 ,对全球各区域平均温度序列进行多种信号的检测、重构 ,着重分析不同区域温度年代和年代际变化的演变特征及其遥相关特点 ,初步研究显著年代际振荡信号的传播特征。结果表明 2 0世纪年代至世纪尺度温度变化的显著信号有准 70年波动和准 30~ 5 0年、准 2 0~ 30年、准 1 5年、准 7~ 1 0年多种时间尺度的振荡 ,其中准 70年波动主要存在于北大西洋及北太平洋的中高纬度 ;准 30~ 5 0年振荡则覆盖了除部分中纬度海域以外的大部分海陆表面 ,其演变特征基本相似 ,全球年平均温度序列中的显著年代际振荡信号主要反映了这一振荡信号 ;准 2 0~ 30年振荡则主要集中于大洋的中纬度和副热带纬度 ,且具有沿副热带海洋环流传播的特点 ;准 1 5年振荡主要位于热带太平洋海域 ,自1 930年后 ,该信号与北太平洋中纬度准 2 0~ 30年振荡反位相 ;准 7~ 1 0振荡则主要集中于北大西洋及北半球中高纬陆地
【Abstract】 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 show that there are different time scales of significant low frequency oscillations with periods about 70 yr, 30~50 yr, 20~30 yr, 15 yr, and 7~10 yr, respectively Oscillation with the period around 70 years is found in the extra tropical ocean of the 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 ≈ 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
【Key words】 interdecadal oscillation; regional characteristics; teleconnection relationship;
- 【文献出处】 大气科学 ,Chinese Journal of Atmospheric Sciences , 编辑部邮箱 ,2004年04期
- 【分类号】P46
- 【被引频次】23
- 【下载频次】468