中文摘要：

本文利用美国国家大气研究中心（NCAR）T85水平分辨率（～140km）的气候系统模式（CCSM3）在大气CO2含量每年增加1％情景下的模拟输出结果，分析了以青藏高原为代表的中低纬高原山地的温度变化特征。结果表明，随着大气CO2含量的增加，中低纬高原山地气候会显著变暖。地面温度的增加以最低气温最大，其次是平均气温，而最高气温最小。同时，寒冷季节的增温大于温暖季节。而且，气候变暖对海拔高度具有明显的依赖性，即增温幅度通常随海拔高度的增加而增大。青藏高原及其邻近地区（25°～42°N，70°110°E）1～1．5km，3～3．5km和5～5．5km三个高程范围内年平均（最低）气温的增温率分别为3．0（3．3），3．5（3．7）和4．6（5．4）℃／100a，而冬半年平均（最低）气温的增温率分别达到3．1（3．7），3．8（4．2）和4．9（5．9）℃／100a。

英文摘要：

By using climate modeling output of the 1% per year CO2 increasing experiment with the high - resolution （ T85 , 140km horizontal resolution） version of fully coupled Community Climate System Model （CCSM3） developed by the National Center for Atmospheric Research （ NCAR ） , we analyzed characteristics of the change in surface air temperature over major plateaus and mountains in mid - low latitudes. The results show that it is getting warming over mid - and low - latitude high - elevation regions with the increasing of atmospheric CO2 concentration. The increase in monthly mean minimum temperature is the most significant compared to the maximmn or average temperature, especially for cold seasons. An important feature related to high - elevation climatic warming is elevation dependency, i. e. , more pronounced warming occurs at higher elevations. For example, the surface warming generally strengthens with the elevation increasing over the Tibetan Plateau and its surroundings （70o - 105 oE, 26 o -42 oN ）. The linear warming rates of annual average （minimum） temperature reach 3.0 （3.3） , 3.5 （3.7） and 4.6 （5.4） ℃/100a for 3 topography - category zones with elevations in the range of 1 - 1 . 5 km, 3 - 3.5 km, and 5 - 5.5 km, respectively. This modeling result suggests that plateaus and mountains would be most sensitive areas to respond to global climate change.