丁裕国,江志红. 1995. 非均匀站网EOFs展开的失真性及其修正[J]. 气象学报, 53(2):247-253, doi:10.11676/qxxb1995.029
非均匀站网EOFs展开的失真性及其修正
THE LACK FIDELITY OF EOFs EXPANSION OVER HETEROGENEOUS NETWORK AND ITS REVISED SCHEME
投稿时间:1993-04-26  修订日期:1993-09-16
DOI:10.11676/qxxb1995.029
中文关键词:  经验正交函数(EOFs)  非均匀站网  面积权重  气温场变化
英文关键词:Empirical Orthogonal Functions(EOFs)  Heterogeneous network  Area weighting  Temperature change of China
基金项目:自然科学基金
作者单位
丁裕国 南京气象学院, 南京, 210044 
江志红 南京气象学院, 南京, 210044 
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全文下载次数: 1992
中文摘要:
      从理论上证明,非均匀站网EOFs展开有不同程度的失真。在同等条件下,均匀站网与非均匀站网EOFs展开结果有明显差异。提出了一种附加面积权重的修正方案用以弥补非均匀站网EOFs展开的失真现象。实例计算表明,中国气温场(160站)经修正EOFs展开后,其气温变化主分量趋势与特征能更加客观地揭示中国地区增暖效应的局地差异。
英文摘要:
      Theoritically, it is demonstrated that current EOFs expansion results are not true to some extent over heterogeneous network. Under identical conditions, the obvious differences between homogeneous and heterogeneous network are researched for current EOFs expansion. A revised scheme using area weighting is developed, which can to a certain degree compensate for the lack fidelity of the EOFs expansion due to heterogeneous network. According to this technique, the fiedlity of objective information from described meteorological fields is enhanced by using current EOFs method. In a practical case, the regional differences of recent warming effect are more objectively revealed by using the revised EOFs technique to surface temperature field records(network from 160 stations) in response to the trends and features of China region.
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