| 大气季节内振荡的活动与El Nino |
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| 引用本文： | 李桂龙,李崇银.大气季节内振荡的活动与El Nino[J].热带气象学报,1998,14(1):54-62. |
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| 作者姓名： | 李桂龙 李崇银 |
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| 作者单位： | 中山大学大气科学系 |
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| 摘 要： | 用广东省４７个测站１９５４－１９９０年各月的平均气温、降水、日照时数的标准化资料分别作按时间点分解的主分量分析，取其前６个主分量作为各测站的气候特征量，用相关系数－重心法作聚类分析，作出各月、全年综合要素的气候分区。结果表明：（１）将广东各月分为有较显著差异的５个区，则冬半年（１０－翌年４月）各月的分区形式较类似且规律性明显，夏半年（５－９月）各月的分区逐月变化明显，且分区形式差别较大。（２）若用６个自然季节的平均气温、降水、日照时数标准化资料分别作主分量分析，各取前３个主分量作为全年气候分区的特征量，则广东全年的气候区可分为东南沿海、西南沿海、西北内陆３个区。
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| 关 键 词： | 主分量分析 聚类分析 气候分区 广东 局地气候 |
| 收稿时间： | 1996/9/26 0:00:00 |
| 修稿时间： | 1997/1/28 0:00:00 |
ACTIVITY OF ATMOSPHERIC INTRASEASONAL OSCILLATION AND EL NINO |
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| Li Guilong and Li Chongyin.ACTIVITY OF ATMOSPHERIC INTRASEASONAL OSCILLATION AND EL NINO[J].Journal of Tropical Meteorology,1998,14(1):54-62. |
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| Authors: | Li Guilong and Li Chongyin |
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| Institution: | LASG, Institute of Atmospheric Physics, Chinese Academy of Science, Beijing, 100080;LASG, Institute of Atmospheric Physics, Chinese Academy of Science, Beijing, 100080 |
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| Abstract: | Three El Nino events are analyzed based on filter method(band pass,low pass)by using ECMWF data.It is clearly shown that tropical intraseasonal oscillation is strong prior to El Nino, corresponding to the occurrence of El Nino event,intraseasonal oscillations obviously weaken and the most obvious variation zone is in tthe tropical eastern Pacific .For quasi stationary wave (with period greater than 90 days),corresponding to the occurrence of El Nino event,its kinetic energy increases obviously and the most obvious variation zone is from Atlantic westward to the tropical western Pacific.The quasi stationary wave kinetic energy is greater in middle(25-35°N)and middle high(40-50°N)latitude than in the tropics.The quasi stationary wave kinetic energy in middle latitude show consistent variation with tropical quasi stationary wave energy variation,that is,corresponding to the occurrence of El Nino event,quasi stationary wave kinetic energy increases in middle latitude.In middle high latitude(40-50°N),quasi stationary wave shows consistent variation with the tropics in Asia continent(100-170°E).We also point out the eastward propagation of tropical intraseasonal oscillation plays an important role to tropical westerly anomaly and occurrence of El Nino. |
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| Keywords: | rincipal component analysis Cluster analysis Climate classification |
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