| 广西2013年夏季旱涝急转特征 |
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| 引用本文： | 何慧,陆虹.广西2013年夏季旱涝急转特征[J].热带地理,2014,34(6):767-775. |
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| 作者姓名： | 何慧 陆虹 |
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| 作者单位： | （广西壮族自治区气候中心，南宁 530022） |
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| 基金项目： | 华南区域气象中心科技攻关项目(GRMC2014Z04)；公益性行业(气象)科研专项经费项目(GYHY201306021)；广西科学研究与技术开发计划项目 |
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| 摘 要： | 利用NCEP/NCAR（美国国家环境预报中心/美国国家大气研究中心）全球日平均再分析资料和广西气象信息中心整理的广西88个国家气象观测站逐日降水量资料，对2013年夏季广西旱涝急转现象及环流背景特征等进行分析，结论如下：1）广西2013年夏季总降水量接近正常，但发生了旱涝急转现象，第31―44候全区平均降水量偏少36%，而第45―48候全区平均降水量偏多1.4倍，转折点发生在第45候（8月第3候）。2）第31―44候平均环流呈现出典型的干旱环流特征，欧亚中高纬度地区环流平直，西太平洋副高偏强，并控制广西，华南上空水汽通量散度为辐散。而第45―48候平均环流在对流层低层呈现出明显的偏涝特征，广西处在副高南侧、并受热带辐合带（ITCZ）控制，华南上空风场为气旋式异常、水汽通量散度为辐合、对流加强。3）2013年第45候大气环流发生调整，沿110° E的副高脊线由25° N突然北跳到30°―35° N，ITCZ随之向北移动，并在缅甸―华南―菲律宾北侧稳定维持，台风接连影响广西，使广西由干旱迅速转为持续的雨涝天气。
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| 关 键 词： | 旱涝急转 大气环流 副热带高压 水汽通量 广西 |
Characteristics of the Sharp Turn from Drought to Flood over Guangxi in Summer of 2013 |
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| HE Hui,LU Hong.Characteristics of the Sharp Turn from Drought to Flood over Guangxi in Summer of 2013[J].Tropical Geography,2014,34(6):767-775. |
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| Authors: | HE Hui LU Hong |
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| Institution: | （Guangxi Climate Center，Nanning 530022，China） |
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| Abstract: | By using the global reanalysis data provided by NCEP/NCAR, and the daily precipitation data at 88 national meteorological observational stations of Guangxi provided by Guangxi Meteorological Information Center, the phenomenon and its circulation background of the sharp turn from drought to flood in summer in 2013 over Guangxi were briefly analyzed. The conclusions are as follows: 1) In summer of 2013, the total precipitation over Guangxi was almost normal, but a sharp turn from drought to flood occurred. The mean precipitation from the 31st to the 44th pentad was 36% less than normal, while that from the 45th to the 48th pentad was 1.4 times more, and the kickpoint was at the 45th pentad (the 3rd pentad in August). 2) The mean circulation from the 31st to the 44th pentad showed the typical characteristics of drought, such as in middle and high latitude areas of Eurasian, the western Pacific subtropical high was more intense and controlled Guangxi, the moisture flux divergence over south China was positive anomaly. And those from the 45th to the 48th pentad showed the obvious characteristics of flood over the lower troposphere, Guangxi was located south of the western Pacific subtropical high, and controlled by ITCZ, the wind fields over south China were cyclonic anomaly, the moisture flux divergence was negative anomaly, and convection enhanced. 3) The atmospheric circulation changed at the 45th pentad. The western Pacific Subtropical high along 110° E jumped to north from 25° N to 30-35° N abruptly. The ITCZ moved northward with the Subtropical high, and remained stable along the line of Burma-south China-the Philippines. Guangxi was influenced by typhoons, and the weather rapidly turned from drought to flood. |
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| Keywords: | sharp turn from drought to flood atmospheric circulation the western Pacific subtropical high the moisture flux |
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