| 厄尔尼诺年西北太平洋异常反气旋的年际变化特征及其影响 |
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| 引用本文： | 李慧敏,徐海明,李智玉.厄尔尼诺年西北太平洋异常反气旋的年际变化特征及其影响[J].Acta Meteorologica Sinica,2017,75(4):581-595. |
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| 作者姓名： | 李慧敏 徐海明 李智玉 |
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| 作者单位： | 南京信息工程大学气象灾害教育部重点实验室和气象灾害预报预警与评估协同创新中心, 南京, 210044;大气科学与环境气象国家级教学示范中心(南京信息工程大学), 南京, 210044,南京信息工程大学气象灾害教育部重点实验室和气象灾害预报预警与评估协同创新中心, 南京, 210044;大气科学与环境气象国家级教学示范中心(南京信息工程大学), 南京, 210044,南京信息工程大学气象灾害教育部重点实验室和气象灾害预报预警与评估协同创新中心, 南京, 210044;大气科学与环境气象国家级教学示范中心(南京信息工程大学), 南京, 210044 |
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| 基金项目： | 国家自然科学基金项目（41575077、41490643）、江苏省333高层次人才培养工程（BRA2015290）。 |
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| 摘 要： | 基于1901-2000年多种海-气资料，分析了厄尔尼诺成熟年冬季-初夏西北太平洋异常反气旋（WNPAC）的年际变化特征及其对东亚气候的影响。结果表明，无论是厄尔尼诺事件成熟期的冬季还是次年的春季和初夏，WNPAC的年际变化主要存在两个空间变化型，即反映其强度变化的经验正交函数分解第1模态和反映其位置变化的第2模态。厄尔尼诺成熟年冬季WNPAC强度不仅与赤道中东太平洋海温异常有关，而且与太平洋西部（WP）型遥相关的强度有关，而其位置的变化则主要与西北太平洋局地海温异常以及北极涛动（AO）有关；次年春季，WNPAC的强度除了与赤道中东太平洋海温异常和太平洋西部型遥相关存在显著相关外，还与赤道大西洋海温异常有关，而其位置的变化则主要与西北太平洋局地海温异常和太平洋西部型遥相关有关；次年初夏，WNPAC强度主要与西北印度洋和西南印度洋的海温异常以及东亚-太平洋（EAP）型遥相关的强度有关。进一步分析表明，成熟年冬季-初夏WNPAC的强度和位置的变化均可对东亚地区降水异常分布产生影响，这对预测厄尔尼诺事件发生后冬季及后期春、夏季节东亚地区降水异常分布具有一定的指示意义。此外，次年初夏，WNPAC强度变化与西北太平洋台风发生频数存在显著负相关，即WNPAC越强，台风发生的频数越少，反之亦然。
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| 关 键 词： | 厄尔尼诺 西北太平洋异常反气旋 太平洋西部型 北极涛动 东亚-太平洋型 |
| 收稿时间： | 2017/2/20 0:00:00 |
| 修稿时间： | 2017/4/3 0:00:00 |
Inter-annual variation of the western North Pacific anomalous anticyclone during El Niño years and its impact |
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| LI Huimin,XU Haiming and LI Zhiyu.Inter-annual variation of the western North Pacific anomalous anticyclone during El Niño years and its impact[J].Acta Meteorologica Sinica,2017,75(4):581-595. |
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| Authors: | LI Huimin XU Haiming and LI Zhiyu |
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| Institution: | Key Laboratory of Meteorological Disaster of Ministry of Education and Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China;National Demonstration Center for Experimental Atmospheric Science and Environmental Meteorology Education, Nanjing University of Information Science and Technology, Nanjing 210044, China,Key Laboratory of Meteorological Disaster of Ministry of Education and Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China;National Demonstration Center for Experimental Atmospheric Science and Environmental Meteorology Education, Nanjing University of Information Science and Technology, Nanjing 210044, China and Key Laboratory of Meteorological Disaster of Ministry of Education and Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China;National Demonstration Center for Experimental Atmospheric Science and Environmental Meteorology Education, Nanjing University of Information Science and Technology, Nanjing 210044, China |
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| Abstract: | The inter-annual variation of the western North Pacific anomalous anticyclone (WNPAC) during El Niño years was investigated based on a variety of air-sea datasets during the period of 1901 to 2000, and its impact on East Asian climate was also discussed. Results show that there are two main spatiotemporal modes for the WNPAC based on empirical orthogonal function (EOF) analysis, i.e., the first mode as its intensity variation and the second mode as its position variation. During the El Niño mature phase in winter, the WNPAC intensity is highly correlated with sea surface temperature anomalies (SSTAs) over the equatorial central-eastern Pacific and the West Pacific (WP) teleconnection pattern at 500 hPa, while its position is highly related to SSTAs over the western North Pacific and Arctic Oscillation (AO). In the subsequent spring season after the El Niño mature phase, the intensity of WNPAC is also highly correlated with SSTAs over the equatorial Atlantic in addition to its high correlation with SSTAs over the equatorial central-eastern Pacific and WP teleconnection pattern in winter, while its position is greatly influenced by SSTAs over the western North Pacific and WP teleconnection pattern. In the subsequent early summer, the intensity of WNPAC is highly related to SSTAs over the northwestern and southwestern Indian Ocean and East Asia-Pacific (EAP) teleconnection pattern. Results further indicate that the inter-annual variations of both the WNPAC intensity and position have great impacts on precipitation over East Asia during El Niño mature winter and subsequent spring and early summer. Additionally, the intensity of the WNPAC is also highly negatively correlated with the occurrence frequency of tropical cyclone over the western North Pacific during the early summer, i.e., the stronger the WNPAC intensity is, the fewer the number of tropical cyclone is, and vice versa. |
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| Keywords: | El Niño WNPAC WP AO EAP |
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