| 1980—1989年全球1000 hPa高度距平3—5年尺度演变 |
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| 引用本文： | 吴仁广,陈烈庭.1980—1989年全球1000 hPa高度距平3—5年尺度演变[J].大气科学,1995,19(5):575-585. |
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| 作者姓名： | 吴仁广 陈烈庭 |
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| 作者单位： | 中国科学院大气物理研究所,北京 100080 |
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| 摘 要： | 80年代发生了两次较强的El Ni?o事件。本文利用 ECMWF的月平均资料，分析了1980—1989年期间1000 hPa高度距平3—5年尺度的全球演变特征。发现了南北半球主要正负距平的演变既有驻波特征，又有传播波特征。南半球正负距平的变化与南方涛动相联系，而北半球正负距平的变化与北方涛动相联系。二者既互相独立，又互相配合。它们在80年代两次ENSO过程的演变中都起着重要作用。特别是1982／1983和1986／1987年El Ni?o事件发生前，分别有明显负距平沿南、北太平洋副热带自西部移向东部，使南
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| 关 键 词： | 高度距平 3—5年周期 南方涛动 北方涛动 |
3-5 Year Time Scale Evolution of Global 1000 hpa Height Anomaly during 1980-1989 |
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| Wu Renguang and Chen Lieting.3-5 Year Time Scale Evolution of Global 1000 hpa Height Anomaly during 1980-1989[J].Chinese Journal of Atmospheric Sciences,1995,19(5):575-585. |
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| Authors: | Wu Renguang and Chen Lieting |
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| Abstract: | The characteristics of 3-5 year time scale evolution of global 1000 hpa height anomaly from 1980through 1989 are investigated. It is found that the main positive and negative anomalies in the Son hemHemisphere and Northern Hemisphere have both standing-type and propagating-type character .ties.The anomalies in the Southern Hemisphere are associated with the Southern Oscillation and those ti theNorthern Hamisphere are related to the Northern Oscillation. The Southern Oscillation and Not hemOscillation are not only independent, but also cooperating. They play impoftant roles in the evohntionof the two ENSO cycles during the 1980's. Especially, when the negative anomalies move from the western to eastern Pacific along the subtropics of the South and North Pacific, the Southern and the h orthern Oscillations are weakened, and broadscale warming occurs in equatorial middle and eastern F tcificon account of their coherent effects. A significant difference betWeen these two ENSO cycles is t) at inthe first cycle, the progress of the positive and negative height anomalies in the South and North F tcificare relatively consistent, and the collaboration of the Southern and the Northern Oscillation is I liter,while in the second cycle, there are obvious phase differences between them. This may be an impt -tautcause to stronger 1982 / 1983 E1 Nino, while the positive SST anomaly is maintained for longer thne inthe equatorial middle and eastern Pacific during 1986 / 1987 EI Nino. The origins, movements an(theircooperation of the positive and negative height anomalies of the Southern and Northern Oscillaton inthese two ENSO cycles are analyzed in detail. |
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| Keywords: | height anomaly 3-5 year time scale Southern Oscillation Northern Oscillation |
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