摘要
利用GAME Tibet加强观测期间所得到的青藏高原不同地点的降水量资料 ,初步分析了 1 998年 7月和 8月夏降风降水随纬度和海拔高度的变化特征。研究表明藏北高原夏季风降水的分布是纬度效应和海拔高度效应综合作用的结果。 7月份降水量的纬度效应要比高度效应明显 ,而 8月份的降水量不但具有一定的纬度效应 ,也具有一定的海拔高度效应。 7月～ 8月份的降水量主要表现为随纬度的分布特征 ,但它也受到海拔高度效应的修正 ,即由于地形对降水的再分配过程 ,使得某些测点降水随海拔高度的升高而增加。由于青藏高原地表状况复杂 ,其上的降水显然应当同时受到各种因素的影响和制约 ,因此要简单地区分各因子的作用是较困难的。
According to the precipitation data in northern Qinghai Tibet Plateau collected during the IOP (Intense Observation Period) of GAME Tibet, some features of the precipitation (July and August) was preliminarily examined. The results showed that the distribution of summer monsoon precipitation was affected by latitude, altitude and other factors. The latitude effect of precipitation in July was more significant than the altitude effect. However, the precipitation in August not only showed latitude distribution but also showed altitude distribution to certain extent. Although July is rainy season in Qinghai Tibet Plateau, however, the surface is still relative dry and the moisture mainly comes from oceans. Thus, the large scale precipitation only resulted in insignificant altitude effect in July. In August, the wet surface and relatively strong evaporation could redistribute the precipitation. The rise activity associated with valley wind in the daytime caused by the slope heat effect could induce rise of precipitation on slopes. So such precipitation re distribution processes due to the slopes make the precipitation in August with significant altitude effect. The distribution of precipitation during July August mainly showed latitude effect but was modified by the altitude effect. Namely, the re distribution processes caused by topography make the precipitation increase with altitude at some sites. Due to the complexity of the surface conditions on Qinghai Tibet Plateau, the precipitaion was certainly controlled by a lot of factors simultaneously. It is difficult to separate simply the effect of any factor.
出处
《资源科学》
CSSCI
CSCD
北大核心
2000年第6期43-46,共4页
Resources Science
基金
中国科学院重大项目!(KZ95 1 B1 2 12
KZ95 1 A1 2 0 4 0 4
KZ95 1 A1 40 2 )
攀登项目!( 95 YU 2 4)
冰冻圈研究项目
中日GA
关键词
藏北高原
夏季风
降水
纬度
海拔高度
Northern Qinghai Tibet Plateau
Summer monsoon precipitation
Latitude
Altitude
