| 华西秋雨的空间分型及其特征分析 |
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| 引用本文： | 徐金霞,郭海燕,王钦,马振峰,刘佳.华西秋雨的空间分型及其特征分析[J].高原山地气象研究,2019,39(1):26-33. |
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| 作者姓名： | 徐金霞 郭海燕 王钦 马振峰 刘佳 |
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| 作者单位： | 1. 四川省气候中心, 成都 610072; |
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| 基金项目： | 国家自然科学基金项目《华西秋雨年际变化规律及其形成机理研究》(41275097),高原与盆地暴雨旱涝灾害四川省重点实验室项目《四川强降水引发地质灾害风险评估技术》 |
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| 摘 要： | 利用华西地区72个站点1959~2013年秋季(9~11月)降水资料和NCEP/NCAR再分析资料,通过EOF、REOF、MK检验、二阶函数拟合分析、小波分析、合成分析等方法将华西秋雨区划分为南北两个显著区,并对各区域秋雨的时空分布以及旱涝特征进行了详细分析。结果表明:南北两个秋雨区既有共同特征又有个性差异;两者发生突变年份具有明显的一致性,均发生在20世纪80年代中期,年际均存在准6年周期变化,且80年代中期以后南北两个气候区均由年代际降水偏多期转入年代际降水偏少期,但两个秋雨区减少趋势存在明显差异,南区减少较北区显著;北区自2000年后秋雨年际波动明显,秋季降水有缓慢上升趋势,年代际长周期有所差异。影响关键区旱涝特征的大气环流形势与水汽输送特征也存在显著差异,北部型陕甘南区与中高纬度环流系统、北部冷空气以及来自孟加拉湾与西太平洋地区的两支水汽输送通道密切相关,南部型则主要与印缅槽、南支槽的异常活动以及孟加拉湾的水汽输送更为相关。
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| 关 键 词： | 华西秋雨 空间分型 年际年代际变化 旱涝特征 |
| 收稿时间： | 2019-01-28 |
The Spatial Patterns and Characteristic Analysis of Autumn Rainfall in Southwest China |
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| XU Jinxia,GUO Haiyan,WANG Qin,MA Zhenfeng,LIU Jia.The Spatial Patterns and Characteristic Analysis of Autumn Rainfall in Southwest China[J].Plateau and Mountain Meteorology Research,2019,39(1):26-33. |
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| Authors: | XU Jinxia GUO Haiyan WANG Qin MA Zhenfeng LIU Jia |
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| Affiliation: | 1. Sichuan Climate Center, Chengdu 610072, China;2. Civil aviation flight university of china, Guanghan 618307, China;3. Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu 610072, China |
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| Abstract: | With EOF,REOF,Mann-Kendall test,Morlet wavelet,Second-order polynomial fitting analysis and composite analysis method,abnormal spatial distribution characteristic,the autumn rainfall distribution of Southwest China has divided into two different areas,temporal evolution rule and the drought-flood characteristics of autumn rainfall in Southwest China are studied in detail by using autumn precipitation data for 72 stations during 1959-2013 and NCEP/NCAR reanalysis data.The results show that there are both common features and individual differences.The mutation of two areas both had occurred in the midterm of 80's in the 20th century.The two areas have the consistency characteristics of six-year cycle and the significant differences in more than 10 years decadal long period.there is an obvious change process for the high side-less than normal period since 1985,a decreasing trend for two regions is difference,but more obvious decreasing trend in South area.autumn precipitation in North area has a upward trend slowly and more obvious annual fluctuation after 2000.The study also shows that the feature of Water Vapor Transport and atmospheric circulation which affect with key area have an obvious difference in two different regions.It shows the drought-flood characteristics of autumn rainfall for North region is related to cold air in north,the circulation system in middle-and-high latitude,water vapor transport in the Bay of Bengal and in the western Pacific area;South region are related to Indian-Myanmar trough,southern trough and water vapor transport in the Bay of Bengal. |
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| Keywords: | autumn rainfall in Southwest China the spatial patterns variations in inter-annual and inter-decade scale drought and flood characteristics |
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