近50 a华南干湿状态的时空特征
投稿时间:2011-04-13  修订日期:2011-10-26  点此下载全文
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作者单位
范伶俐 广东海洋大学 海洋与气象学院,广东 湛江 524088 
张福颖 南京信息工程大学 大气科学学院,江苏 南京 210044 
胡祯祥 广东海洋大学 海洋与气象学院,广东 湛江 524088 
魏蕾 广东海洋大学 海洋与气象学院,广东 湛江 524088 
基金项目:广东海洋大学科研项目(1112189);广东海洋大学大学生创新实验项目(1056610065)
中文摘要:利用华南地区63个气象站1961—2007年的降水和气温资料,采用月干湿气候指数计算华南各月的干湿状态,其结果可以明显区分华南地区的干湿季。通过趋势分析、EOF(the empirical orthogonal function,自然正交函数分解)分析、合成分析等方法分析了近50 a华南地区干湿状态时空特征。趋势分析结果表明:华南地区2—3月、5月和7—8月明显变湿,而4月、9—12月显著变干,1月和6月变化趋势不明显,即华南地区的秋季旱情在过去50 a有加重的趋势,而春季旱情有所缓解,夏季洪涝则加重。EOF分析表明,华南地区东、西部干湿状态的时间演变位相相反。背景特征分析表明,华南地区干湿状态主要影响因子可能为海气相互作用过程和陆气相互作用过程。
中文关键词:干湿指数  趋势  空间分布  华南
 
Spatial and temporal features of dry and wet states in South China in recent 50 years
Abstract:By using the rainfall and air temperature observation data from 63 surface stations in South China during 1961—2007,the monthly dry and wet states were calculated by climatic dry and wet index,whose results could obviously tell the dry seasons from wet ones in South China.The spatial-temporal characteristics of dry and wet states over South China in recent 50 a were analyzed by trend analysis and EOF synthetical analysis.The trend analyses reflected the fact that for the whole region of South China,the climate from February to March,May and from July to August tended to be wetter,and it became dryer in April and from September to December.There were few changes in January and June.The results showed that the autumn drought was more severe while the spring drought was lighter and the summer flood was more severe in the past 50 a.EOF analysis revealed that the phases of time evolution were contrast to each other in east and west regions of South China.Synthetical analysis showed that dry and wet states were mainly affected by air-sea and air-land interactions.
keywords:the dry and wet index  trend  spatial distribution  South China
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