中文摘要：

通过对沙尘天气史料的甄别,运用信息化处理方式,对唐代西北地区沙尘天气的发生特征进行了研究。检索到唐代西北地区沙尘天气记录40条,将其中记载序列较好的唐都长安沙尘记载进行了时间分布分析,发现唐代沙尘天气发生等级有着明显的增高趋势,探讨了这种变化的人文动因以及沙尘源因素。唐代后期以来,河西、新疆、内蒙古西部等沙尘源地战乱的增多以及土地利用方式的改变、唐代后期河西走廊等地的沙漠化等因素均与之有很大的关系。研究历史上沙尘天气发生发展的特征,不仅能够复原此类天气发生的历史实况,而且对于我们今天科学地认识沙尘天气的历史过程及其机制,做好预测预防工作,推动生态文明建设有着重要的史鉴意义。

英文摘要：

In this paper,how to use the historical records to research the characteristics of sand-dust weather in Northwest China in the Tang Dynasty was discussed. The 40 pieces of the historical records about sand-dust weather in Northwest China in the Tang Dynasty were used to emphatically analyze the temporal distribution and characteristics of sand-dust weather in Chang＇an,the capital of China at that time. It was found that the grades of sand-dust weather were in an obvious increase trend,and the artificially driving factors and the sand sources were researched.Such trend was mainly caused by the increase of sand sources in the Hexi Corridor,Xinjiang and west Inner Mongolia due to the frequent occurrence of wars,change of land use ways and land desertification after the late Tang Dynasty. It was considered that to research the occurrence and development characteristics of sand-dust weather in history is of an important historical referential significance for understanding the actual situation of sand-dust weather in history,and scientifically revealing the historical process and mechanism of sand-dust weather so as to predict and control sand-dust weather and push forward the construction of ecological civilization.