| On the ENSO Mechanisms |
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| 作者姓名： | Chunzai Wang |
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| 作者单位： | Chunzai Wang Physical Oceanography Division，NOAA Atiantic Oceanographic and Meteorological Laboratory，Miami，Florida，U. S. A. |
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| 摘 要： | The El Nino-Southern Oscillation (ENSO) is an interannual phenomenon involved in the tropical Paci fic Ocean-atmosphere interactions. The oscillatory nature of ENSO requires both positive and negative ocean-atmosphere feedbacks. The positive feedback is dated back to Bjerknes＇ hypothesis in the 1960s, and different negative feedbacks have been proposed since the 1980s associated with the delayed oscillator, the western Pacific oscillator, the recharge-discharge oscillator, and the advective-reflective oscillator. The de layed oscillator assumes that wave reflection at the western boundary provides a negative feedback for the coupled system to oscillate. The western Pacific oscillator emphasizes equatorial wind in the western Pacific that provides a negative feedback for the coupled system. The recharge-discharge oscillator argues that discharge and recharge of equatorial heat content cause the coupled system to oscillate. The advective-re flective oscillator emphasizes the importance of zonal advection associated with wave reflection at both the western and eastern boundaries. All of these physics are summarized in a unified ENSO oscillator. The de layed oscillator, the western Pacific oscillator, the recharge-discharge oscillator, and the advective-reflec tive oscillator can be extracted as special cases of the unified oscillator. As suggested by this unified oscillator, all of the previous ENSO oscillator mechanisms may be operating in nature.
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On the ENSO Mechanisms |
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| Chunzai Wang.On the ENSO Mechanisms[J].Advances in Atmospheric Sciences,2001,18(5):674-691. |
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| Authors: | Chunzai Wang |
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| Institution: | Physical Oceanography Division, NO AA Atlantic Oceanographic and Meteorological Laboratory, Miami, Florida, U. S. A. |
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| Abstract: | The El Nino-Southern Oscillation (ENSO) is an interannual phenomenon involved in the tropical Paci- fic Ocean-atmosphere interactions. The oscillatory nature of ENSO requires both positive and negative ocean-atmosphere feedbacks. The positive feedback is dated back to Bjerknes' hypothesis in the 1960s, and different negative feedbacks have been proposed since the 1980s associated with the delayed oscillator, the western Pacific oscillator, the recharge-discharge oscillator, and the advective-reflective oscillator. The de- layed oscillator assumes that wave reflection at the western boundary provides a negative feedback for the coupled system to oscillate. The western Pacific oscillator emphasizes equatorial wind in the western Pacific that provides a negative feedback for the coupled system. The recharge-discharge oscillator argues that discharge and recharge of equatorial heat content cause the coupled system to oscillate. The advective-re- flective oscillator emphasizes the importance of zonal advection associated with wave reflection at both the western and eastern boundaries. All of these physics are summarized in a unificd ENSO oscillator. The de- layed oscillator, the western Pacific oscillator, the recharge-discharge oscillator, and the advective-reflec- tive oscillator can be extracted as special cases of the unified oscillator. As suggested by this unified oscillator, all of the previnus ENSO oscillator mechanisms may be operating in nature. |
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| Keywords: | El Nino-Southern Oscillation ENSO theory Climate variability Ocean-atmosphere interactions |
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