| 南印度洋副热带偶极模在ENSO事件中的作用 |
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| 引用本文： | 晏红明,李崇银,周文.南印度洋副热带偶极模在ENSO事件中的作用[J].地球物理学报,2009,52(10):2436-2449. |
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| 作者姓名： | 晏红明 李崇银 周文 |
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| 作者单位： | 1.云南省气候中心，昆明 650034;2.中国科学院大气物理研究所大气数值模拟国家重点实验室，北京 100029;3.解放军理工大学气象学院，南京 211101;4.香港城市大学与中国科学院大气物理研究所大气科学联合实验室，香港城市大学 |
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| 基金项目： | 国家自然科学基金，国家自然科学重点基金课题，LASG开放课题共同资助 |
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| 摘 要： | 南印度洋副热带偶极模（Subtropical Dipole Pattern，SDP）是印度洋存在的另一种很明显的偶极型海温差异现象，在年际和年代际尺度上均有十分明显的表现.而目前有关印度洋海气相互作用的研究主要集中在赤道印度洋地区，针对南印度洋地区的工作还比较少，特别是有关南印度洋海温与ENSO（El NiDo-Southern Oscillation）事件关系的研究.本文初步探讨了年际尺度上南印度洋副热带偶极型海温变化差异与ENSO事件的关系，发现SDP与ENSO事件有密切的联系，SDP事件就像连接正负ENSO位相转换的一个中间环节，SDP事件前后期ENSO的位相刚好完全相反.进一步，本文通过分析SDP事件前后期海温、高低层风、低层辐合辐散、高空云量和辐射等的变化特征研究了南印度洋偶极型海温异常在ENSO事件中的作用，结果表明：SDP在ENSO事件中的作用不仅涉及海气相互作用的正负反馈过程，还与热带和副热带大气环流之间的相互作用有关，特别是与东南印度洋海温变化所引起的异常纬向风由赤道印度洋向赤道太平洋传播的过程等有十分直接的关系；同时，SDP对ENSO事件的影响在很大程度上还依赖于大尺度平均气流随季节的变换.
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| 关 键 词： | 南印度洋副热带偶极模（SDP） ENSO循环 正负反馈过程 可能机制 |
| 收稿时间： | 2009-3-12 |
| 修稿时间： | 2009-5-9 |
Influence of subtropical dipole pattern in southern Indian Ocean on ENSO event |
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| YAN Hong-Ming,LI Chong-Yin,ZHOU Wen.Influence of subtropical dipole pattern in southern Indian Ocean on ENSO event[J].Chinese Journal of Geophysics,2009,52(10):2436-2449. |
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| Authors: | YAN Hong-Ming LI Chong-Yin ZHOU Wen |
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| Institution: | 1.Yunnan Climate Centers, Kunming 650034, China;2.State Key Laboratory of Numerical Modeling for Atmospheric Science and Geophysical Fluid Dynamics,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,China;3.Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101, China;4.CityU-IAP Laboratory for Atmospheric Sciences, City University of Hong Kong |
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| Abstract: | Subtropical Dipole Pattern (SDP) in southern Indian Ocean is another significant dipolelike sea surface temperature anomalies (SSTA) phenomena besides tropical Indian Ocean dipole (TIOD). It is very clear in interannual and interdecadal variations. But many recent studies have mainly aimed at the SST of equatorial Indian Ocean and less at southern Indian Ocean, especially less at the relationship between SSTA in southern Indian Ocean and El Nino-Southern Oscillation (ENSO). Present works investigated primarily the correlation between the SDP and ENSO. It is found that SDP event act as a crucial linkage between positive and negative ENSO phases. The SST As in equatorial eastern Pacific Ocean are completely reversed before and after SDP event. Further, we investigated the possible impact of SDP on ENSO event in interannual scale by researching the anomalous characteristics of sea temperature, wind, convergence and divergence, total cloud amount, radiation and so on. The results showed that the influence of SDP on ENSO involve not only the process of positive and negative air-sea feedback, but also the interaction between atmospheric circulation over tropical and subtropical, specially the eastward propagation of anomalous zonal wind from the equatorial Indian Ocean to the Pacific Ocean. Otherwise, it also relates, to some extent, to the transition of large-scale climatic mean flow over the Indian Ocean and Pacific Ocean. |
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| Keywords: | Subtropical Dipole Pattern in southern Indian Ocean (SDP) El Nino-Southern Oscillation (ENSO) cycle Positive and negative feedback Possible mechanism |
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