| 2013年长江中下游地区夏季高温事件的环流特征及成因 |
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| 引用本文： | 夏扬,徐海明.2013年长江中下游地区夏季高温事件的环流特征及成因[J].气象科学,2017,37(1):60-69. |
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| 作者姓名： | 夏扬 徐海明 |
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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, 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 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 |
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| 基金项目： | 国家自然科学基金资助项目（41275094，41490643，41575077）；国家重点基础研究发展计划（973计划）项目（2012CB955602）；江苏高校优势学科建设工程资助项目（PAPD）；江苏省高校“青蓝工程”资助项目 |
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| 摘 要： | 采用ERA-interim和NCEP CFSR逐日再分析资料以及长江中下游29个测站的逐日温度资料，分析了2013年7月23日-8月14日长江中下游地区夏季异常高温的特点、环流特征及成因。研究结果表明，2013年夏季高温期间西太平洋副热带高压较往年异常偏强，西太平洋副热带高压控制区内大范围异常下沉运动产生的大气绝热加热是高温形成的主要原因。同时，与强大西太平洋副热带高压相联系的异常强大反气旋环流使得长江中下游地区上空的水汽向东北方向大量输出，导致了该区域水汽含量的减少，致使到达地面的太阳短波辐射增加，这是高温形成的又一原因。进一步分析表明，2013年夏季海洋性大陆地区大气热源异常偏强，该地区大气热源的异常增强可能是导致2013年夏季西太平洋副热带高压异常偏强的主要原因。
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| 关 键 词： | 西太平洋副热带高压 极端高温 海洋性大陆 大气热源 |
| 收稿时间： | 2015/7/28 0:00:00 |
| 修稿时间： | 2015/9/30 0:00:00 |
Circulation characteristics and causes of the summer extreme high temperature event in the middle and lower reaches of the Yangtze River of 2013 |
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| XIA Yang and XU Haiming.Circulation characteristics and causes of the summer extreme high temperature event in the middle and lower reaches of the Yangtze River of 2013[J].Scientia Meteorologica Sinica,2017,37(1):60-69. |
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| Authors: | XIA Yang and XU Haiming |
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| Institution: | Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044, China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044, China and Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044, China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044, China |
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| Abstract: | Based on the ERA-interim, NCEP CFSR daily reanalysis data and daily observation temperature data from 29 stations over middle and low reaches of Yangtze River, the characteristics of the extreme high temperature event,circulation features and its causes over the middle and lower reaches of the Yangtze River during 23 July to 14 August, 2013 were analyzed. Results show that the intensity of the Western Pacific Subtropical High (WPSH) was extremely strong in summer of 2013, and the atmospheric adiabatic heating caused by the enhancing sinking motion in the WPSH controlling zone is the main cause for this high temperature event. Moreover, the extremely enhanced WPSH-related anticyclonic circulation leads to an increasing outflow of the water vapor over the middle and lower reaches of the Yangtze River area to the east, which causes the decreasing of the water vapor content, increasing of downward solar radiation flux at the surface, so this is another cause for this high temperature event. Further analysis indicates that an anomalous enhanced atmospheric heating source over the Maritime Continent is probably the main reason why the WPSH is extremely strong in summer of 2013. |
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| Keywords: | Western Pacific subtropical high Extreme high temperature Maritime continent Atmospheric heating source |
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