中国冬季气温异常EOF分析的改进
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国家重点基础研究发展计划项目(2010CB951601);公益性行业(气象)科研专项(GYHY(QX)200806009;GYHY(QX)201006038;GYHY(QX)201006020);江苏高校优势学科建设工程资助项目(PAPD)


Improvements of empirical orthogonal function analysis for winter temperature anomaly over China
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    摘要:

    采用站网均匀化订正方法处理了中国160站站网1951-2010年冬季(12月-次年2月)气温距平序列,订正后的序列较好地处理了由站网不均匀性引起的方差不均匀。对订正前、后序列分别作了EOF分析,结果表明:1)订正后序列的前2个典型场上的高绝对值区比订正前序列的前2个特征向量有更好的组织性,其高值区主要位于三北地区(西北、华北、东北)及青藏高原,与均方差场的高值区基本一致;2)订正前、后主要模态时间系数演变特征相似(rh≥0.886,h=1,2),但订正后的前2个时间系数的线性分量和年代际变化分量对它们的方差贡献更加集中于第一模态;3)订正后资料EOF分析的第一个典型场和时间系数中的线性分量可以给出中国最近60 a冬季主要强增暖区的分布;其年代际分量与分析期间中国强年代际变化分布区域的一致性也优于订正前资料的EOF分析结果。

    Abstract:

    Temperature anomaly series at 160 stations of China in winter(December,January and February) from 1951 to 2010 are processed by the station homogeneity adjustment scheme.The adjusted series for dealing with the variance heterogeneity distribution caused by station network heterogeneity are more effective.EOF(empirical orthogonal function) analysis method is used to study the original and adjusted temperature anomaly series.Results show that:1)There is better organization for high absolute value areas of the first two typical fields of the adjusted data than those of the original data because the high absolute value areas of the typical fields locate mainly in the three north region(Northwest China,North China and Northeast China) and the Tibetan Plateau,which are consistent with the high value areas of mean square deviation field.2)The evolution features of main mode time coefficients of before and after adjustment are similar rh≥0.886,h=1,2),but the variance contribution of linear and interdecadal components of the first two time coefficients for the adjusted data much more focus on the first mode.3)The linear components of the first typical fields and their time coefficients for the adjusted data can display the main strong warming areas over China in winter during the past 60 years,and their interdecadal components are more consistent with the evident interdecadal variation areas over China than those of the original.

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周国华,罗小莉,王盘兴,李丽平,谢瑶瑶,2012.中国冬季气温异常EOF分析的改进[J].大气科学学报,35(3):295-303. ZHOU Guo-hua, LUO Xiao-li, WANG Pan-xing, LI Li-ping, XIE Yao-yao,2012. Improvements of empirical orthogonal function analysis for winter temperature anomaly over China[J]. Trans Atmos Sci,35(3):295-303.

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  • 收稿日期:2011-07-30
  • 最后修改日期:2012-01-14
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