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。
heoritically. 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 methed.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.
出处
《气象学报》
CSCD
北大核心
1995年第2期247-253,共7页
Acta Meteorologica Sinica
基金
自然科学基金
关键词
经验正交函数
非均匀站网
气温场变化
Empirical Orthogonal Functions (EOFs)
Heterogeneous network
Area Weighting
Temperature change of China.
