| 近40年高层温度场和高度场的时空变化特征 |
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| 引用本文： | 毕云,钱永甫.近40年高层温度场和高度场的时空变化特征[J].南京气象学院学报,2001,24(1):59-65. |
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| 作者姓名： | 毕云 钱永甫 |
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| 作者单位： | 南京大学大气科学系, |
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| 基金项目： | 国家自然科学基金重点项目“中国区域气候变化分析和机理研究”!(4 9735 170 )资助 |
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| 摘 要： | 用4种方式对NCEP／NCAR全球再分析资料中1958－1997年300hPa月均温度、100hPa月均高度资料序列进行对比分析，发现300hPa温度资料可靠性高于100hPa高度资料；详细考察近40a高层温度场、高度场的时空变化特征，并通过Morlet小波进一步分析两要素场的周期变化发现，温度场和高度场的EOF第1模态具有很好的空间整体民生和明显的年际和年代际变化，以10a左右和3a左右的周期为主要周期。
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| 关 键 词： | 温度场 高度场 时空变化 诊断分析 周期变化 Morlet小波 |
| 修稿时间： | 2000年4月10日 |
The Temporal and Spatial Variations of the Upper Level Temperature and Height Fields in Recent 40 Years |
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| BI Yun,Qian Yongfu.The Temporal and Spatial Variations of the Upper Level Temperature and Height Fields in Recent 40 Years[J].Journal of Nanjing Institute of Meteorology,2001,24(1):59-65. |
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| Authors: | BI Yun Qian Yongfu |
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| Abstract: | The 300hPa monthly mean temperatures and the 100hPa monthly mean heights derived from the NCEP/NCAR reanalysis data from 1958 to 1997 are analyzed by four data processing schemes,respectively.The results are compared with one another.It is shown that the dependability of the 300hPa temperature data is super to that of the 100hPa height data.The temporal and spatial variations of the temperature and the height fields are also analyzed and the periodic analysis of the two elements is conducted by means of the Morlet wavelet technic.It is found that the first EOF modes of the two fields both have good spatial consistence and temporal persistence,as well as evident interannual and decadal variations with main periods of about 10 years and 2~5 years respectively. |
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| Keywords: | temperature field height field temporal and spatial variations diagnostic analysis |
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