| Roles of Multi-Scale Disturbances over the Tropical North Pacific in the Turnabout of 1997-98 El Nino |
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| 引用本文： | 张祖强,张人禾. Roles of Multi-Scale Disturbances over the Tropical North Pacific in the Turnabout of 1997-98 El Nino[J]. 大气科学进展, 2007, 24(4): 581-590. DOI: 10.1007/s00376-007-0581-0 |
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| 作者姓名： | 张祖强 张人禾 |
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| 作者单位： | [1]Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing 100081 [2]Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081 [3]NOAA Climate Prediction Center, Camp Springs, MD 20746, U.S.A |
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| 摘 要： | The space-time features of major vorticity disturbances over the western North Pacific during the 1997-98 El Nino ranked as one of the strongest events on record was investigated in this study. We distinguished the different roles that these disturbances had on different timescales in causing the reversal or turnabout of the El Nino event. Remarkable differences in the various disturbances of synoptic, intraseasonal, and interannual timescales were found in the time evolution, propagation, and in their contributions to the changes in nearequatorial zonal flow, which was crucial to the demise of the warm sea surface temperature anomalies in the central-eastern Pacific. It is hypothesized that the westward-traveling synoptic and intraseasonal oscillations in the western North Pacific might be considered as a self-provided negative feedback from the El Nino and played an additional role in its reversal in comparison with other interannual internal and external forcings. In this case, the off-equatorial synoptic and intraseaonal fluctuations served as a stochastic forcing for the tropical ocean and gave rise to the aperiodicity or irregularity of the El Nino-Southern Oscillation.
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| 关 键 词： | 海洋气象学 厄尔尼诺 开尔文波 季节性变化 北太平洋 |
| 收稿时间： | 2006-05-25 |
| 修稿时间： | 2006-05-252006-11-25 |
Roles of multi-scale disturbances over the tropical North Pacific in the turnabout of 1997–98 El Niño |
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| Zhang Zuqiang,Zhang Renhe,Song Yang. Roles of multi-scale disturbances over the tropical North Pacific in the turnabout of 1997–98 El Niño[J]. Advances in Atmospheric Sciences, 2007, 24(4): 581-590. DOI: 10.1007/s00376-007-0581-0 |
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| Authors: | Zhang Zuqiang Zhang Renhe Song Yang |
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| Affiliation: | Laboratory for Climate Studies, National Climate Center, China Meteorological Administration,Beijing 100081,Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081,NOAA Climate Prediction Center, Camp Springs, MD 20746, U.S.A. |
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| Abstract: | The space-time features of major vorticity disturbances over the western North Pacific during the 1997-98 El Ni(n)o ranked as one of the strongest events on record was investigated in this study. We distinguished the different roles that these disturbances had on different timescales in causing the reversal or turnabout of the El Ni(n)o event. Remarkable differences in the various disturbances of synoptic, intraseasonal, and interannual timescales were found in the time evolution, propagation, and in their contributions to the changes in nearequatorial zonal flow, which was crucial to the demise of the warm sea surface temperature anomalies in the central-eastern Pacific. It is hypothesized that the westward-traveling synoptic and intraseasonal oscillations in the western North Pacific might be considered as a self-provided negative feedback from the El Ni(n)o and played an additional role in its reversal in comparison with other interannual internal and external forcings.In this case, the off-equatorial synoptic and intraseaonal fluctuations served as a stochastic forcing for the tropical ocean and gave rise to the aperiodicity or irregularity of the El Ni(n)o-Southern Oscillation. |
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| Keywords: | intraseasonal oscillation ENSO Kelvin wave western North Pacific |
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