光学学报, 2019, 39 (10): 1001004, 网络出版: 2019-10-09
MODIS C061气溶胶光学厚度产品在西安地区的适用性研究 下载: 1007次
Applicability of MODIS C061 Aerosol Optical Depth Products in Xi'an Region
大气光学 太阳光度计 MODIS 气溶胶光学厚度 西安地区 atmosphere optics sky radiometer MODIS aerosol optical depth Xi'an region
摘要
利用西安地区太阳光度计(POM-02)的观测数据,根据比尔-朗伯-布格定律计算了西安地区的大气气溶胶光学厚度(AODs),将其作为真值与NASA Terra卫星的MODIS C061产品中气溶胶光学厚度的三种反演结果进行了对比,探讨了三种反演算法在西安地区的精确度及适用性,并结合MODIS气溶胶产品统计分析了西安及周边地区气溶胶光学厚度的空间分布和季节变化特征。结果表明: Terra卫星MODIS三种反演算法中DT&DB产品与太阳光度计反演的气溶胶光学厚度相关系数最高(0.92),故MODIS中的DT&DB产品最适用于西安地区,可用于西安地区气候变化以及大气污染等研究。分析关中地区AOD的时空分布特征及其可能原因可知:关中地区气溶胶主要包括人类活动产生的气溶胶和沙尘气溶胶,关中地区气溶胶光学厚度整体呈东高西低的分布趋势,高值中心主要分布在西安、渭南和咸阳等地区;气溶胶光学厚度在西安、咸阳地区春季最大、秋季最小,而在关中其他地区整体呈现春夏高、秋冬低的季节变化趋势。
Abstract
Aerosol optical depths (AODs) are calculated for the Xi'an region based on the observation data of a sky radiometer (POM-02) and Beer-Lambert-Bouguer law. These AODs are used as true values to compare with three inversion algorithms' results of AODs in the MODIS C061 product of NASA Terra satellite, and the accuracies and applicability of those three inversion algorithms for the Xi'an region are discussed. Furthermore, we statistically analyze the spatial distributions and seasonal variation characteristics of AODs for the Xi'an region and its surrounding region using MODIS aerosol products. The results indicate the following: there is the best relationship between the AODs inverted from the MODIS DT&DB product and POM-02 data among those three MODIS inversion algorithms of Terra satellite, and its correlation coefficient is approximately 0.92. Thus, the MODIS DT&DB product is the most appropriate product for studying climate change and air pollution in the Xi'an region. Dust storms and human activities are the main sources of aerosols in the Guanzhong Plain. The AODs are greater in the eastern part and less in the western part of Guanzhong Plain, and the high-value centers are mainly distributed in the regions such as Xi'an, Xianyang, and Weinan. The AODs in the Xi'an and Xianyang regions reach their maximum and minimums in the spring and autumn, respectively. However, the AODs from other regions in the Guanzhong Plain show apparently seasonal variation characteristics with greater values in spring and summer and lower values in autumn and winter.
刘晶晶, 刘芸, 王国英, 华灯鑫, 王骏, 闫庆, 何廷尧, 高飞. MODIS C061气溶胶光学厚度产品在西安地区的适用性研究[J]. 光学学报, 2019, 39(10): 1001004. Jingjing Liu, Yun Liu, Guoying Wang, Dengxin Hua, Jun Wang, Qing Yan, Tingyao He, Fei Gao. Applicability of MODIS C061 Aerosol Optical Depth Products in Xi'an Region[J]. Acta Optica Sinica, 2019, 39(10): 1001004.