中文摘要：

喷雾器的时间、空间的变化和原因在 Shaanxi 省的光深度(AOD ) 基于导出的中等分辨率成像分光辐射函数(MODIS ) 被调查为 3 月 2000February 日 2012 的时期的喷雾器数据。结果证明喷雾器的分发被地形学和本地经济活动大部分影响。重喷雾器在 AOD 装载并且增加趋势在 Guanzhong， Hanzhong 和 Ankang 盆被观察，当一个反向的趋势在大多数另外的区域被揭示时。喷雾器埃波长代表的空间分发是主要与在 Shaanxi 的植被范围有关。来自地面的在空中的灰尘是粗糙的模式喷雾器的重要来源。灰尘天气的规范的差别植被索引( NDVI )和减小的增加显示的植被改进在 Shaanxi 在粗糙的模式 AOD 导致了渐渐的减少到 Qinling 山的北方，当人为的活动在好模式导致了增加时，在除了那些的另外的区域的 AOD 由森林盖住。主要喷雾器类型逐渐地在 Shaanxi 变了到城市的工业类型。

英文摘要：

The temporal and spatial variations and causes of aerosol optical depth （AOD） in Shaanxi Province were investigated based on the Moderate Resolution Imaging Spectroradiometer （MODIS） derived aerosol data for the period of March 2000-February 2012. The results showed that the distribution of aerosol was largely affected by topography and local economic activities. Heavy aero- sol loading and increasing tendency in AOD was observed in Guanzhong, Hanzhong and Ankang basin, while a reverse tendency was revealed in most other regions. The spatial distribution of aerosol Angstrom wavelength exponent was predominantly related to vegetation coverage in Shaanxi. Airborne dust from ground is an important source of coarse mode aerosols. Vegetation im- provement indicated by an increase in normalized difference vegetation index （NDVI） and a reduction in dust weather led to a gradual decrease in coarse mode AOD to the north of Qinling Mountains in Shaanxi, while anthropogenic activities led to an in- crease in fine mode AOD in other areas except those covered by forests. The main aerosol type gradually shifted to the urban industrial type in Shaanxi.