纵向岭谷区8月气温的年际变化及其影响因子  

Interannual change of air temperature in August in Longitudinal Range-Gorge Region and its influence factors

作　　者：姚平[1] 曹杰[1] 张万诚[2] 

机构地区：[1]云南大学大气科学系 [2]云南省气象科学研究所,云南昆明650034

出　　处：《自然灾害学报》2007年第3期49-54,共6页Journal of Natural Disasters

基　　金：国家重点基础研究发展规划项目(2003CB415100)

摘　　要：将地表温度和向外长波辐射拓展成为综合因子后,应用主分置-典型相关分析方法分析了纵向岭谷区76个测站8月气温与前期和同期地表温度和向外长波辐射因子间的关系。结果表明:7月及8月地表温度场和向外长波辐射场与云南纵向岭谷区8月温度场存在显著的相关关系,通过5%的显著性检验。前期及同期纵向岭谷区8月气温典型相关场的正、负值区分布情况大致相同,即纵向岭谷区北部怒江、澜沧江的上游流域和沿怒江、澜沧江、元江以西流域的8月气温与沿这3条河流以东的流域的同月气温为反向分布,其显著相关区位于3条河流以东和以西两个流域的德宏州、临沧市、思茅市、西双版纳州、大理州及楚雄州。菲律宾附近海域、中南半岛、南海及加里曼丹岛等区域是地表温度及向外长波辐射典型相关场中正、负值较大、较小的区域,也是影响纵向岭谷区8月气温的关键区域,同时印缅低压、西太平洋副热带高压是影响该区的关键系统。Combined with surface temperature and outgoing long wave radiation data as the integrated factor field, the correlation between air temperature in August at 76 observation stations and the factor field for prophase and the corresponding period is analyzed with principal component analysis （PCA） -canonical correlation analysis （ CCA ） method in this paper. The results show that there is significant correlation between the factor field in July and August and the temperature in August over Longitudinal Range-Gorge Region （LRGR）, and the Augus correlations all get across 5% significant test. The positive and negative distribution of the temperature in August over LRGR in prophase is consistent with that in the corresponding period. The distribution of temperature in August over the upriver areas of Nujiang River-valley and Lancang River-valley and the western areas along the three valleys which inelude Nujiang River-valley, Lancang River-valley and Yuanjiang River-valley, is contrary to that in eastern areas along the three valleys. The significant correlation areas are Dehong, Lincang, Simao, Xishuangbanna, Dali and Chuxiong, where are in the eastern and western part along the three valleys. Moreover, Philippines, South China Sea, Kalimantan Island and Indo-China peninsula where are the areas with positive bigger value or negative smaller values in the canonical correlation field of outgoing long ware radiation （OLR） and surface temperature （ST）, have an mainly impact on temperature in August over LRGR. The India-Burma low pressure and western Pacific high pressure are the pivotal systems.

关 键 词：纵向岭谷区 典型相关分析 地表温度 向外长波辐射 气温 

分 类 号：P461[天文地球—大气科学及气象学]