| 1998年与1954年夏季大尺度环流特征的对比分析 |
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| 引用本文： | 晁淑懿,李月安.1998年与1954年夏季大尺度环流特征的对比分析[J].气象,2000,26(1):38-42. |
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| 作者姓名： | 晁淑懿 李月安 |
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| 作者单位： | 国家气象中心,北京,100081 |
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| 摘 要： | 对比分析夏季发生在长江全流域两次特大洪涝的１９５４年和１９９８年大尺度环充的特征。指出１９５４年西北太平洋副热带高压第二次季节性北跳明显偏迟，出现在８月初，６～７月副高位置持续偏南，８月副高位置偏北；而１９９８年副高第二次季节性北跳偏早，出现在７月上旬中期，但盛夏７月下旬～８月底副高位持续偏南，这两年夏季亚洲西凤带阻塞高压活动都十分频率，１９９８年更甚。夏季赤道辐合带１９９８年明显弱于１９５４年。
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| 关 键 词： | 热带高压 阻塞高压 赤道辐合带 大尺度 环流特征 |
Compared Analysis of Large-scale Circulation Characteristics in Summer between 1998 and 1954 |
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| Chao Shuyi,Li Yuean.Compared Analysis of Large-scale Circulation Characteristics in Summer between 1998 and 1954[J].Meteorological Monthly,2000,26(1):38-42. |
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| Authors: | Chao Shuyi Li Yuean |
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| Abstract: | The large scale circulation characteristics in summer between 1998 and 1954 were comparied.Both years happened catastropic flood in the whole Yangtze River valley since the 20th century.The results of analysis show that the second seasonal jumping northward of subtropical high over the north west Pacific had been obviously postponed in 1954, which appeared in early August.And subtropical high was unusually southward than normal from June to July.Nevertheless,its seasonal jumping northward was advanced in 1998, which appeared in early July, and the subtropical high was further south persistently than normal from the third dekad of July to the end of August.At the same time, ITCZ of summer was notably weaker in 1998 than in 1954.But the action of blocking high of the westerly belt in Asia was very frequently in summer of the both years, especially in 1998. |
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| Keywords: | seasonal jumping northward of subtropical high blocking high ITCZ |
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