| A NUMERICAL STUDY OF SHORT-RANGE CLIMATIC OSCILLATION WITH VARIOUS TIME SCALES FORCED BY EL NINO DURING THE NORTHERN SUMMER |
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| 作者姓名： | Ni Yunqi Lin Wuyin |
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| 作者单位： | Department of Atmospheric Science Nanjing University，Nanjing，Department of Atmospheric Science，Nanjing University，Nanjing |
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| 摘 要： | The normal mode method is adopted to decompose the differences between simulations with SST(seasurface temperature)anomahes over centra-eastern Pacific and normal SST by use of a nine-layer global spec-tral model in order to investigate short-range climatic oscillation with various time scales forced by ElNino during the northern summer.Investigation shows that El Nino may have the following influence onatmosphere on various space-time scales.Extra-long wave components of Rossby mode forced by convectiveanomaly over equatorial western Pacific resulting from El Nino produce climatic oscillation on monthly(sea-sonal)time scale in middle-high latitudes of Southern and Northern Hemispheres;extra-long wave componentsof Kelvin mode forced by SST anomalies propagate along the equator,resulting in 30—60 day oscillation oftropical and subtropical atmosphere;and its long waves move eastward with westerly,resulting in quasi-biweekoscillation.
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| 收稿时间： | 1989/2/18 0:00:00 |
A NUMERICAL STUDY OF SHORT-RANGE CLIMATIC OSCILLATION WITH VARIOUS TIME SCALES FORCED BY EL NINO DURING THE NORTHERN SUMMER |
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| Ni Yunqi,Lin Wuyin.A NUMERICAL STUDY OF SHORT-RANGE CLIMATIC OSCILLATION WITH VARIOUS TIME SCALES FORCED BY EL NINO DURING THE NORTHERN SUMMER[J].Acta Meteorologica Sinica,1990,4(3):305-324. |
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| Authors: | Ni Yunqi and Lin Wuyin |
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| Affiliation: | Department of Atmospheric Science, Nanjing University, Nanjing;Department of Atmospheric Science, Nanjing University, Nanjing |
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| Abstract: | The normal mode method is adopted to decompose the differences between simulations with SST (sea surface temperature) anomahes over centra-eastern Pacific and normal SST by use of a nine-layer global spectral model in order to investigate short-range climatic oscillation with various time scales forced by El Nino during the northern summer.Investigation shows that El Nino may have the following influence on atmosphere on various space-time scales.Extra-long wave components of Rossby mode forced by conve ctiveanomaly over equatorial western Pacific resulting from El Nino produce climatic oscillation on monthly (seasonal) time scale in middle-high latitudes of Southern and Northern Hemispheres;extra-long wave components of Kelvin mode forced by SST anomalies propagate along the equator,resulting in 30-60 day oscillation of tropical and subtropical atmosphere;and its long waves move eastward with westerly,resulting in quasi-biweek oscillation. |
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