岭谷组合地形区雨季开始期及成因分析  

Study on Rainy Season Onset the Longitudinal Range-gorge Region and Its Reasons

作　　者：郝成元[1] 许传阳[1] 吴绍洪[2] 

机构地区：[1]河南理工大学测绘与国土信息工程学院,河南焦作454000 [2]中国科学院地理科学与资源研究所,北京100101

出　　处：《水土保持研究》2010年第5期180-182,186,共4页Research of Soil and Water Conservation

基　　金：河南省软科学研究(082400440750);国家重点基础研究发展计划(2003CB415101)

摘　　要：雨季开始期是云南省大部分地区春季作物栽培的季节,其到来时间早或晚将直接影响本区农业生产。以云南省南部岭谷组合地形区30个气象台站2001年日降水序列为基础数据,对雨季开始期进行了时间推算。结果显示：无量山-哀牢山组合地形以东地区基本在4月底以前进入雨季,西部地区直到5月2候才完全进入雨季,即东部地区相对于西部地区提前2~3候。究其原因,有2个方面：其一,影响研究区的两股水汽来临时间存在相位差;其二,哀牢山、无量山等大地形对水汽的输送有显著的截留和阻隔作用。总之,由于高大山地对水汽输送的阻隔与截留作用,无量山-哀牢山组合地形不仅成为研究区雨季开始期区域差异的分界线,也成为东亚夏季风和南亚夏季风影响地区的分界地带之一。The onset of rainy season is the period of spring grops planting in most regions of Yunnan province,which has direct impact to agricultural production.Based on their daily precipitation of 2001 for time series,this study calculates the onset of rainy season of thirty meteorological stations in the Longitudinal Range-gorge Region in Yunnan province.Taking the composite area of Wuliang Mountain and Ailao Mountain as a boundary line,rainy season onset of most stations are the sixth five-day of April or before in the eastern part but ten or fifteen days later in the western.The reasons are demonstrated as follows： firstly,there is a time difference between two water vapours approaching.It is well known that the South China Sea summer monsoon onset is earlier than Indian summer monsoon.Secondly,the huge mountains,such as Wuliang Mountain and Ailao Mountain,have interception and barrier effect on the incoming vapours including the bay of bengal summer monsoon and the south China sea summer monsoon.It acts on the water vapor transport of not only South China Sea summer monsoon from east to west,but also the Bay of Bengal summer monsoon from west to east in study area.In short,because of the interception and barrier of huge mountains effect on the incoming vapours,the composite area of Wuliang Mountain and Ailao Mountain becomes the boundary line of rainy season onset approaching in time difference,and is one of the dividing zones between the East Asia summer monsoon and the South Asia summer monsoon.

关 键 词：岭谷组合地形 雨季开始期 季风系统 阻隔作用 

分 类 号：P426.615[天文地球—大气科学及气象学]