纵向岭谷区北回归线一带年降水区域分异特征  

Regional Variation of Annual Precipitation along the Tropic of Cancer in Longitudinal Range-Gorge Region

作　　者：胡金明[1,2] 何大明[1,2] 吴绍洪[3] 李运刚[1,2] 曹杰[4] 

机构地区：[1]云南省国际河流与跨境生态安全重点实验室,昆明650091 [2]云南大学亚洲国际河流中心,昆明650091 [3]中国科学院地理科学与资源研究所,北京100101 [4]云南大学资源环境与地球科学学院,昆明650091

出　　处：《地理学报》2010年第3期281-292,共12页Acta Geographica Sinica

基　　金：国家科技部科技基础性工作专项(2008FY110300);国家重点基础研究发展计划项目(2003CB415101)资助~~

摘　　要：利用纵向岭谷区北回归线沿线及南北两侧的24个站点1961-2007时段月降水资料,基于全部站点的年降水主要特征统计,以及北回归线沿线的9个站点的年降水变化的趋势性和阶段性检验、9个站点间的年降水和5-10月各月降水序列的相关性检验,分析研究区的年降水及变化分异特征。结果表明:研究区年降水主要特征及其年际变化,呈现出西部、中部、东部的空间分异,即三个区域各自内部自相似度高,而三个区域之间分异明显。北回归线沿线9个站点的年降水序列都未表现出明显的"突变趋势性—阶段性"变化。研究区中部"岭—谷"相间的地形格局,对中部区域降水空间分异产生一定的影响,但相邻站点间多年际降水序列呈高度相关,意味着控制中部区域降水的决定性因素并不存在明显分异,间隔分布的"岭—谷"地形会带来局地性降水量的分异。Through using monthly precipitation data of 24 meteorological stations near the Tropic of Cancer in southern Longitudinal Range-Gorge Region （LRGR） covering the period 1961-2007, this study first analyzed the main characteristics of annual precipitation at each station. Secondly, it tested the changing trend and phases of annual precipitation at 9 stations along the Tropic of Caner in the study area. Then it calculated the correlation coefficients of annual precipitation series and monthly （May to October） precipitation series between stations along the Tropic of Cancer. The results showed that in the study area, annual precipitation and its inter-annual changes are characterized by certain regional variations. On this basis, three zones are identified, i.e., western part, central part and eastern part. High similarity was found in each of the three parts and obvious variation was observed among them. Annual precipitation series at each station along the Tropic of Cancer within the study area did not present obvious ＂abrupt trends-phases＂ changes. Range-gorge landforms within the central part of the study area have certain influences upon the spatial variation of precipitation, while high correlation coefficients of annual and monthly precipitation occurred between the neighbouring stations, especially on the two sides of the Ailao Mountain within the central part, indicating that there were no obvious differences for the precipitation-driving factors in the central part. Regional inter-distributed range-gorge landforms are likely to cause local variations of precipitation.

关 键 词：云南 纵向岭谷区 北回归线一带 年降水 区域分异 

分 类 号：P426.6[天文地球—大气科学及气象学]