| ENSO Amplitude Change in Observation and Coupled Models |
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| 作者姓名： | 张琼 关月 杨海军 |
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| 作者单位： | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric Physics，Chinese Academy of Sciences，Beijing 100029，State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG)Institute of Atmospheric Physics，Chinese Academy of Sciences，Department of Atmospheric Science，School of Physics，Peking University，Beijing 100871，Beijing 100029 Graduate University of the Chinese Academy of Sciences，Beijing 100049 |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划)，Kev Lab of Physical Oceanogra play |
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| 摘 要： | Observations show that the tropical E1 Nifio-Southern Oscillation （ENSO） variability, after removing both the long term trend and decadal change of the background climate, has been enhanced by as much as 60% during the past 50 years. This shift in ENSO amplitude can be related to mean state changes in global climate. Past global warming has caused a weakening of the Walker circulation over the equatorial Indo-Pacific oceans, as well as a weakening of the trade winds and a reduction in the equatorial upwelling. These changes in tropical climatology play as stabilizing factors of the tropical coupling system. However, the shallower and strengthening thermocline in the equatorial Pacific increases the SST sensitivity to thermocline and wind stress variabilities and tend to destabilize the tropical coupling system. Observations suggest that the destabilizing factors, such as the strengthening thermocline, may have overwhelmed the stabilizing effects of the atmosphere, and played a deterministic role in the enhanced ENSO variability, at least during the past half century. This is different from the recent assessment of IPCC-AR4 coupled models.
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| 关 键 词： | 变温层 赤道仪 耦合模型 振幅变化 |
| 收稿时间： | 30 January 2007 |
ENSO amplitude change in observation and coupled models |
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| Qiong Zhang,Yue Guan,Haijun Yang.ENSO Amplitude Change in Observation and Coupled Models[J].Advances in Atmospheric Sciences,2008,25(3):361-366. |
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| Authors: | Qiong Zhang Yue Guan Haijun Yang |
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| Institution: | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG),
Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG),
Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 10002 ; Graduate University of the Chinese Academy of Sciences, Beijing 10004;Department of Atmospheric Science, School of Physics, Peking University, Beijing 100871 |
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| Abstract: | Observations show that the tropical El Nino-Southern Oscillation (ENSO) variability, after removing both the long term trend and decadal change of the background climate, has been enhanced by as much as 60% during the past 50 years. This shift in ENSO amplitude can be related to mean state changes in global climate. Past global warming has caused a weakening of the Walker circulation over the equatorial Indo-Pacific oceans, as well as a weakening of the trade winds and a reduction in the equatorial upwelling. These changes in tropical climatology play as stabilizing factors of the tropical coupling system. However, the shallower and strengthening thermocline in the equatorial Pacific increases the SST sensitivity to thermocline and wind stress variabilities and tend to destabilize the tropical coupling system. Observations suggest that the destabilizing factors, such as the strengthening thermocline, may have overwhelmed the stabilizing effects of the atmosphere, and played a deterministic role in the enhanced ENSO variability, at least during the past half century. This is different from the recent assessment of IPCC-AR4 coupled models. |
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| Keywords: | ENSO variability global warming thermocline Equatorial Pacific |
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