| 基于改进综合气象干旱指数的2011年和2013年长江中下游干旱低频振荡特征分析 |
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| 引用本文： | 林家尧,王文,蔡晓军.基于改进综合气象干旱指数的2011年和2013年长江中下游干旱低频振荡特征分析[J].气象科学,2016,36(6):810-818. |
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| 作者姓名： | 林家尧 王文 蔡晓军 |
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| 作者单位： | 南京信息工程大学 大气科学学院, 南京 210044,南京信息工程大学 大气科学学院, 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 大气科学学院, 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 |
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| 基金项目： | 国家自然科学基金资助项目（41275091） |
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| 摘 要： | 利用NCEP/NCAR逐日再分析资料和地面观测资料，基于改进的综合气象干旱指数（IC）对长江中下游地区2011年春季和2013年夏季干旱过程的低频振荡特征进行了分析。结果表明：2011年春季干旱过程的主要低频IC周期为30~60 d，西太平洋500 hPa正异常低频高度场系统的西移、南支锋区上游500 hPa正异常低频高度场系统的东移和北扩、西北地区东部低层低频反气旋的向南移动可能是低频IC传播变化特征的重要原因。2013年夏季干旱过程的主要低频IC周期也为30~60 d，西亚和西北太平洋500 hPa正异常低频高度场向我国南方地区移动、孟加拉湾和西北太平洋的低层低频反气旋向西和向北移动与低频IC传播变化特征有重要联系。
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| 关 键 词： | 长江中下游 干旱 低频振荡 |
| 收稿时间： | 2015/10/30 0:00:00 |
| 修稿时间： | 1/3/2016 12:00:00 AM |
Analysis of the low-frequency oscillation characteristics over mid-lower reaches of the Yangtze River in 2011 and 2013 based on improved comprehensive meteorological drought index |
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| LIN Jiayao,WANG Wen and CAI Xiaojun.Analysis of the low-frequency oscillation characteristics over mid-lower reaches of the Yangtze River in 2011 and 2013 based on improved comprehensive meteorological drought index[J].Scientia Meteorologica Sinica,2016,36(6):810-818. |
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| Authors: | LIN Jiayao WANG Wen and CAI Xiaojun |
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| Institution: | School of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, China,School of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, China;Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044, China and School of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, China;Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044, China |
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| Abstract: | By using the daily NCEP/NCAR reanalysis dataset and the observation data, based on the improved comprehensive meteorological drought index (CI), the Low-Frequency Oscillation (LFO) characteristics in the drought processes in spring of 2011 and in summer of 2013 over mid-lower reaches of the Yangtze river were analyzed. Results show that the major LFO period of the spring drought process in 2011 is 30-60 d. Westward movement of positive anomaly of 500 hPa low-frequency height field over western Pacific, eastward and northward movement of positive anomaly of 500 hPa low-frequency height field over upper reaches of southern branch frontal zone and southward movement of lower level low-frequency anticyclone over eastern Northwest China may be the important reasons of the variation of low-frequency CI. The major LFO period of the summer drought in 2013 is also 30-60 d. Southward movement to South China of positive anomaly of 500 hPa low-frequency height field over West Asia and western Pacific and westward, northward movement of lower level low-frequency anticyclone over the Bay of Bengal and western Pacific have an important connection with low-frequency CI variation. |
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| Keywords: | Mid-lower reaches of the Yangtze river Drought LFO |
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