| 辽宁降水分区变化特征及夏季降水影响因子分析 |
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| 引用本文： | 孙莹,万丽岩,江静.辽宁降水分区变化特征及夏季降水影响因子分析[J].气象与环境学报,2008,24(3):18-23. |
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| 作者姓名： | 孙莹 万丽岩 江静 |
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| 作者单位： | 1.南京大学大气科学系 江苏南京210093;2.丹东市气象局;辽宁丹东118000;3.兴城市气象局 辽宁兴城125100 |
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| 摘 要： | 根据1961—2000年辽宁地区降水资料,将辽宁地区降水划分为4个区,分析各分区降水的年际、年代际、季节变化以及周期特征。结果表明:辽宁南部和东南部地区降水明显减少;自20世纪90年代开始,东南部和南部地区降水显著减少,而中部地区降水增加;东南部地区的夏冬季和南部地区的冬季降水减少,西部地区春季降水增多。周期特征为春季和冬季周期为2 a或4 a,夏季和秋季为10 a。各分区夏季降水的影响因子不同,辽南地区多雨年东亚槽明显加深,东南区多雨年东亚槽略有加深并且偏东;南部和东南部夏季降水与副热带高压系统相关显著;各区夏季降水与太阳黑子负相关较好,其中8月相关显著,南部和中部相关性均好于东南部和西部地区。
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| 关 键 词： | 辽宁夏季降水 聚类分析 分区 影响因子 太阳黑子指数 |
| 收稿时间： | 2007-9-14 |
| 修稿时间： | 2008-1-30 |
Characteristics of precipitation division and controlling factors of summer precipitation in Liaoning province |
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| SUN Ying,WAN Li-yan,JIANG Jing.Characteristics of precipitation division and controlling factors of summer precipitation in Liaoning province[J].Journal of Meteorology and Environment,2008,24(3):18-23. |
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| Authors: | SUN Ying WAN Li-yan JIANG Jing |
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| Institution: | SUN Ying1;2.WAN Li-yan3 JIANG Jing1 |
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| Abstract: | Based on the monthly average precipitation data from 1961 to 2000 in Liaoning province,precipitation regions were divided into 4 regions.And inter-annual,inter-decadal,seasonal and cycle characteristics were analyzed in the different subareas.The results show that precipitation reduces obviously in the south and southeast of Liaoning province.Precipitation reduces obviously in the south and southeast of Liaoning province since 1990s,while precipitation increases in the middle of Liaoning province.Precipitation decreases in summer and winter in the southeastern region and in winter in the southern region,while precipitation increases in spring in the western region.The cycles in spring and winter are 2 a and 4 a,respectively.However,the cycles in both summer and autumn are 10 a.The controlling factors of summer precipitation are different in each subarea.East Asian trough deepens obviously in rainy year in the south of Liaoning province,while it deepens a little and leans to the east in rainy year in the southeast of Liaoning province.The relationship between summer precipitation and subtropical high pressure is significant.There is an obviously negative relationship between summer precipitation and sunspot in the south and southeast of Liaoning province,especially in August.The correlations in the south and middle of Liaoning province are significant,followed in the southeast and west of Liaoning province. |
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| Keywords: | Summer precipitation in Liaoning province Cluster analysis Division Impact factors Sunspot index |
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