CAJ | 학술논문

用我国南方58年(1951—2008年)夏半年的总降水量、极端干期以及干湿指数综合表现干湿特征,进而用经验模态分解方法分析南方干湿的年代际变化.结果表明,58年内有3个干期(1961—1965、1985—1990和2005—2008年)以及3个湿期(1952—1954、1970—1973和1994—1998年).为了探讨南方干湿的转换机制,采用与南方干湿年代际变化相关联的夏季风和西太平洋副热带高压等年代际环流因子作为结点构建网络,分析同步和耦合与干湿气候主要转换之间的关联.网络平均距离的3个局部最小值(即同步),都伴之以耦合的增强,对应着我国南方由湿期向干期的转换.
용아국남방58년(1951—2008년)하반년적총강수량、겁단간기이급간습지수종합표현간습특정,진이용경험모태분해방법분석남방간습적년대제변화.결과표명,58년내유3개간기(1961—1965、1985—1990화2005—2008년)이급3개습기(1952—1954、1970—1973화1994—1998년).위료탐토남방간습적전환궤제,채용여남방간습년대제변화상관련적하계풍화서태평양부열대고압등년대제배류인자작위결점구건망락,분석동보화우합여간습기후주요전환지간적관련.망락평균거리적3개국부최소치(즉동보),도반지이우합적증강,대응착아국남방유습기향간기적전환.
Total precipitation, extreme dry spell and dry and wet indices during 58 summer-half years over southern China are used to indicate dry and wet climatic characteristics. By using the empirical mode decomposition (EMD) method, we analyze dry and wet spell inter-decadal variations over southern China. The results show that there are three dry spells (1961—1965, 1985—1990 and 2005—2008) and three wet spells (1952—1954, 1970—1973 and 1994—1998) during the 58 years. In order to study the dry and wet climatic shift mechanism over southern China, circulation factors such as summer monsoon and the Western Pacific subtropical high, which are associated with dry and wet inter-decadal variations over southern China, are taken as nodes to construct the network. We analyze the synchronous and coupling states associated with dry-wet climatic state shift. The results show that three local minimum (i.e. synchronization) of the average distance of the network are followed by an increase in the coupling strength, which corresponds to the shift from wet to dry spell over southern China.