摘要
滇东北地势南高北低，大致以境内五莲峰和乌蒙山余脉北侧海拔≥２５００ｍ的山系为界：北部倾向四川盆地，南部属云贵高原主体。区内气候特征：１．在垂直分异上，年均温直减率０．４５－０．７７℃／ｈｍ，海拔３４０－２４００ｍ处年降水量垂直递增率２０－５０ｍｍ／ｈｍ；２．在地域分异上，南部比北部的年均温高５．０℃，年均温纬减率高０．６９℃／°Ｎ，年降水量低５４．２ｍｍ。
Northeast Yunnan ,situated at26°06′ 28°36′N,102°55′ 105°03′E,is separated into thesouth and north parts in physical features. The demarcation line is identical with the mountainsystem of2500m absolute height regarded as the north flank of Wulianfeng and WumengMountains,The former part is higher and belongs to Yunnan-Gulzhou Platcau , and the latterinclines to the Sichuan Basin. There are obvious vertical and regional differences of the mountain climatic elements inNortheast Yunnan. On the vertical variations,the lapse rate of mean annual temperature shows 0.45 0.77℃/hm. The annual absolute humklity is in versly proportional to altitude and the vertieal1ncreasing rate of annual pricipitation ranges 20 50mm /hm while the altitude is fixed between3400-2400m. And its regional variation is mainly the difference between south and nouth parts. Comparedwith north part,south part' s mean annual temperature is 5℃ higher,the meridional decrcasingrate of its mean annual temperature is 0.69℃/°N higher,but its relative humidity is 10%lowerand annual precipitation 54.2mm less. The vertical incresing rate of annual precipitation is 20-35mm/hm in south part while 35-50mm/hm in north part.In Ludian County(southeast slope)of south part there is an annual maximum precipitation height which is about 2700m,And thevalue of the precipitation equals to l 270mm. In north part there is no annual maximum precipi-tation height.The mountain climate features of Northeast Yunnan depend greatly on landform,the varia-tions of landform and route of cold air intruding into south,the intensity of south branch westerlyjet stream and the displacement of Kunming quasi-stattonary front.
出处
《山地研究》
CSCD
1994年第1期32-38,共7页
关键词
滇东北
山地气候
垂直分异
气候
Northeast Yunnan, mountain climate,vertical difference,regional difference
