| 两类厄尔尼诺事件发展年秋季印度洋海温异常特征对比 |
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| 引用本文： | 何珊珊,张文君,祁莉,何金海.两类厄尔尼诺事件发展年秋季印度洋海温异常特征对比[J].气象学报,2015,73(3):515-528. |
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| 作者姓名： | 何珊珊 张文君 祁莉 何金海 |
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| 作者单位： | 广西壮族自治区气象台, 南宁, 530022;南京信息工程大学大气科学学院, 气象灾害教育部重点实验室, 南京, 210044,南京信息工程大学大气科学学院, 气象灾害教育部重点实验室, 南京, 210044;南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京, 210044,南京信息工程大学大气科学学院, 气象灾害教育部重点实验室, 南京, 210044;南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京, 210044,南京信息工程大学大气科学学院, 气象灾害教育部重点实验室, 南京, 210044 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)项目(2012CB417403)、国家自然科学基金项目(41005049)、长江学者和创新团队发展计划资助项目 (PCSIRT)、江苏高校优势学科建设工程资助项目(PAPD)、广西科学研究与技术开发计划项目(桂科攻1355010-4)。 |
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| 摘 要： | 基于1951—2010年逐月海气多要素观测资料,对比分析了两类厄尔尼诺事件发展年秋季印度洋的海温异常及大气响应特征,探讨了印度洋偶极子的发生与两类厄尔尼诺事件特征的可能联系。结果表明,两类厄尔尼诺事件的发展年均会出现印度洋偶极子,但出现的概率不同:大多数东部型厄尔尼诺事件都会伴有正位相印度洋偶极子发生;而仅一半的中部型厄尔尼诺事件期间会出现正位相印度洋偶极子的异常海温型,且强度较弱。从印度洋偶极子与两类厄尔尼诺事件的物理联系上看,东部型厄尔尼诺事件期间,印度洋偶极子的发生与其强度联系密切:印度洋偶极子发生在东部型厄尔尼诺事件较强期间,两者通过海洋大陆的异常强下沉运动及大范围负异常降水相联系;东部型厄尔尼诺事件偏弱时并无印度洋偶极子出现,海洋大陆异常下沉运动及负异常降水很弱。然而,中部型厄尔尼诺事件期间印度洋偶极子的发生与其强度并无显著的关系,而与太平洋高海温区的位置存在一定的可能联系:在有印度洋偶极子发生的中部型厄尔尼诺事件发展年秋季,热带太平洋异常高海温区的位置相对偏东,海洋大陆出现显著下沉运动和大范围负异常降水,热带东印度洋为大范围强异常东风控制;但无印度洋偶极子发生的中部型厄尔尼诺事件时,热带太平洋高海温区位置相对偏西,极弱的海洋大陆下沉支对热带印度洋异常海温作用非常有限。
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| 关 键 词： | 两类厄尔尼诺事件 印度洋偶极子(IOD) 大气响应 |
| 收稿时间： | 2014/5/27 0:00:00 |
| 修稿时间： | 2/8/2015 12:00:00 AM |
Contrasting SST anomalies over the Indian Ocean between the two types of El Niño events during boreal autumn |
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| HE Shanshan,ZHANG Wenjun,QI Li and HE Jinhai.Contrasting SST anomalies over the Indian Ocean between the two types of El Niño events during boreal autumn[J].Acta Meteorologica Sinica,2015,73(3):515-528. |
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| Authors: | HE Shanshan ZHANG Wenjun QI Li and HE Jinhai |
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| Institution: | Guangxi Meteorological Observatory, Nanning 530022, China;Key Laboratory of Meteorological Disaster of Ministry of Education/ College of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing 210044, China,Key Laboratory of Meteorological Disaster of Ministry of Education/ College of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing 210044, China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China,Key Laboratory of Meteorological Disaster of Ministry of Education/ College of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing 210044, China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China and Key Laboratory of Meteorological Disaster of Ministry of Education/ College of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing 210044, China |
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| Abstract: | The present work investigates the different impacts of sea surface temperature (SST) anomalies over the tropical Indian Ocean as associated with two types of El Niño events during boreal autumn, based on the observed data sets from 1951 to 2010. Here, we focus on the relationship between the Indian Ocean Dipole (IOD) and these two types of El Niño. It is shown that the positive IOD-like SST anomaly occurs for both EP and CP El Niño autumns, but with a different probability. Most of EP El Niño events are accompanied by a strong positive IOD-like SST anomaly. However, a weak positive IOD-like SST anomaly appears for only half of the CP El Niño events. It seems that there is a strong relationship between the intensity of IOD and that of EP El Niño. That is, IOD tends to occur during the strong EP El Niño autumns, with a strong sinking current and negative rainfall anomaly over the maritime continent. During the CP El Niño, however, the occurrence of IOD seems to be unrelated with the strength of CP El Niño. The location of the CP El Niño is a possible key effect on the intensity of IOD in autumn. For the CP El Niño autumns when an obvious IOD appears, the warming SST anomaly is located slightly eastward over the central Pacific with a strong sinking current and severe drought over the maritime continent, as well as a significant easterly anomaly over the tropical Indian Ocean. While in the CP El Niño autumns during which no positive IOD-like SST anomaly occurs, the Pacific warming SST anomaly is located relatively further west. The very weak anomalous sinking motion seems limited help to sustain the SST anomaly over the Indian Ocean. |
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| Keywords: | Two types of El Niñ o events Indian Ocean Dipole (IOD) Atmospheric response |
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