【摘要】 西北干旱区是中亚干旱区的主要组成部分, 是研究地理科学、生命科学及环境科学的热点地区。本文利用CCM3模式, 做了DE(假定西北干旱环境进一步发展)、FE(假定西北干旱环境改善)和CTL共3个数值试验, 通过分析大气层顶辐射平衡、地表能量平衡、气温变化、降水变化以及植被生理过程的CO2收支变化等, 初步探讨了西北干旱气候环境对全球气候变化的可能影响。结果表明, 西北干旱气候环境的进一步发展或改善, 将对全球的能量平衡过程及其空间分布状态产生影响, 从而可能会影响全球和区域的气候变化及其分布状态。这在全球气温和降水的区域变化上表现比较明显。西北干旱区陆面特征的变化也可以通过生物-地球化学反馈过程影响全球的气候变化, 而且这种影响可能是长期的, 其意义深远。通过分析认为, 西北干旱气候环境的形成和演变是全球气候变化的重要组成部分, 因此西北干旱区的研究必须纳入全球气候环境研究之中, 才能更全面的认识干旱区的形成、演变及其对全球气候变化的贡献和响应。更多还原

【Abstract】 The Northwest China(NWC) drought region is a part of the middle Asian drought region, it is a important study region of the geography, life and environment sciences. In this paper, 3 experiments as DE (changing the NWC surface type to desert), FE (changing the NWC surface type to cold defoliation broad forest) and CTL (control experiment) are made by using CCM3. By analyzing the balance of the radiation on the top of the atmosphere, the balance of the surface energy, the temperature change, the precipitation change and the CO (2 ) fluxes of the vegetation physiologicalprocess, the influence of the drought environment over the NWC region on the global change is primarily studied. The results show that if the drought environment is developed or reformed, it could affect the global energy balance process and its spatial distribution, and then it would affect the global and the regional climate and its distribution. These characters are obviously behaved by global temperature and precipitation regional change. The variation of the land surface type of the NWC can also affect the global climate change by the biology-geochemistry feedback process. And this influence might be long-term and more important. By all the analysis, it is known that the formation and evolvement of the drought climate and environment over the NWC are important part of the global change. So the study of the NWC drought region must be bring into the global climate and environment study. And then the influence and response of the drought region on the global change can be general understand.更多还原