夏季澜沧江跨境径流量变化与夏季风的关系  

Transboundary Runoff Changes of the Lancang River in Summer and the Relationship between It and the Summer Monsoon

作　　者：尤卫红[1] 赵付竹[1] 吴湘云 

机构地区：[1]云南大学资源环境与地球科学学院,云南昆明650091 [2]云南省丽江教育学院,云南丽江674100

出　　处：《高原气象》2007年第5期1059-1066,共8页Plateau Meteorology

基　　金：国家自然科学基金项目(40575046);国家重点基础研究发展计划项目(973计划)(2003CB415100);云南省自然科学基金项目(2004D0005M)共同资助

摘　　要：以澜沧江跨境径流量观测数据、NCEP/NCAR的U场、V场和NOAA的OLR场资料为基础,应用统计分析方法,研究了纵向岭谷作用下的夏季澜沧江跨境径流量变化与夏季风的关系。结果表明:澜沧江夏季跨境径流量变化在20世纪60年代中期至80年代末期为显著减少时段,而从90年代初期以来则表现出了一种显著增多的演变趋势;夏季澜沧江跨境径流量变化与较低层东西风分量变化的相关性不显著,与较高层东西风分量变化的相关性显著;夏季澜沧江跨境径流量变化与中低层和较高层南北风分量变化的相关性都是显著的,与OLR场变化的负相关性也是显著的;根据这些相关性特征建立的影响澜沧江夏季跨境径流量变化的夏季风环流指数能够较好地反映出澜沧江夏季跨境径流量变化的基本特征和规律。Based on the observed data of the transboundary stream flow from the Lancang River and the U,V wind field data of NCEP/NCAR and the OLR field data of NOAA,and using the statistics method,the transboundary runoff changes of the Lancang River and their relationship with the summer monsoon under the effect of the Longitudinal Range-Gorge are investigated.The results show that the transboundary runoff change of the Lancang River appear obviously a decreasing tendency from 1960′s to 1980′s.The transboundary flow change of the lancang River appear obvious increasing tendency since 1990′s.In summer,the correlation of the transboundary runoff with the U wind field in the lower atmosphere layer is no significant,but with the U wind field in the higher atmosphere layer is significant,and with the V wind field in the middle or lower and higher atmosphere layers is very significant,and with the OLR field is also significant.The summer monsoon circulation indexes influencing the variation of transboundary runoff of Lancang River during summer are established by correlation feature.These indexes can quite good describe the feature and regulation of the variation of transboundary runoff during summer in Lancang River.

关 键 词：澜沧江 夏季跨境径流量 夏季风 环流指数 

分 类 号：P425.42[天文地球—大气科学及气象学]