中国北方季风边缘区边界位置的年代际变化
投稿时间:2005-11-07  修订日期:2006-04-25  点此下载全文
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作者单位
富元海 南京信息工程大学, 江苏省气象灾害重点实验室, 江苏, 南京, 210044 
刘宣飞 南京信息工程大学, 江苏省气象灾害重点实验室, 江苏, 南京, 210044 
基金项目:江苏省气象灾害重点实验室资助项目(KLME060210);教育部资助优秀青年教师基金项目
中文摘要:利用中国东部和北部地区155站1961-1999年月平均温度和月平均降水量资料,根据Thornthwaite公式计算水分需要量和湿润度指数,定义了-20和0的湿润指数等值线分别为季风边缘区的上、下边界线,然后分析了上、下边界线的10a际平均位置及其变化情况,并比较了上、下边界线的10a际平均位置与39a平均位置,发现中国东部季风边缘区上、下边界线的波动具有明显的地域性特征,下边界的波动还具有显著的年代际变化特征。此外,分析了季风边缘区3个分区(东北、华北和西北东部区)的降水变化,发现各区的降水变化趋势与边界线的波动趋势一致。
中文关键词:季风边缘区  湿润度指数  波动
 
Interdecadal Fluctuations of the Monsoon's Boundary Zone in the Northern China
Abstract:Based on the monthly mean temperature and precipitation data of 155 stations covering 1961-1999 in eastern and northern China,and using the Thornthwaite formula,the water requirement and the moisture index in study area are calculated in this paper.The-20 and 0 moisture index isolines are defined as the front and back boundaries of monsoon's boundary zone.The boundaries' interdecadal positions and their fluctuations are also analyzed,and results show that in the 39 years,the motion of the monsoon's boundaries in the east of China has an obvious regional character,and the fluctuation of the back boundary also has a conspicuous interdecadal variability.The interdecadal variation characteristics of rainfall in the study area are analyzed too,and it is found that the trends of precipitation in the three subareas,i.e.the east of Northwest China,North China,and Northeast China,are generally in agreement with the respective trends of the boundary fluctuations of monsoon.
keywords:monsoon's boundary zone  moisture index  fluctuate
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