摘要:
气溶胶光学厚度(aerosol optical depth,AOD)是大气环境的重要评价指标,可用于反映空气污染程度.通过卫星遥感获取AOD,可以弥补地面观测难以反映AOD空间分布和整体变化趋势的不足.以池州市为研究区,利用2013年12月—2014年12月间获取的EOS MODIS数据,基于改进的暗像元法(V5.2算法),反演研究区2014年全年4个季度的AOD;在对其可靠性进行验证的基础上,分析研究区AOD时空变化特征.研究结果表明,AOD反演结果与MOD04_3K气溶胶数据在整体变化趋势上有较好的一致性,但同时也存在一定差异,尤其是在冬半年;研究区AOD区域差异和季节变化明显,总体表现为北部沿江AOD明显高于南部,春夏季节高于秋冬季节,同时不同地区变化趋势和幅度存在不同;AOD的时空变化强烈受到自然因素和人为因素2方面的影响.
Abstract:
Aerosol optical depth ( AOD) is a key indicator of the atmospheric environment, which can be used to represent the degree of atmospheric pollution. Obtaining AOD by satellite remote sensing can make up for the lack of the spatial distribution of AOD and the trend of overall change by ground-based observation. With Chizhou City as the study area, the authors retrieved AOD of four seasons in 2014 using the improved dense dark vegetation method(V5. 2 method) based on EOS-MODIS data and analyzed spatial and temporal distribution of AOD after verifying its reliability. The research results show that there is a good consistency in the overall change trend between the AOD retrieved from MODIS and that from MOD04_3K, but they also have some differences, especially in the winter half year. There is a remarkable difference of AOD distribution both regionally and seasonally. Overall performance in the northern part of the AOD is significantly higher than in the south, and spring and summer seasons are higher than the autumn and winter seasons, while different regional trends are different. The temporal and spatial changes of AOD are strongly influenced by natural factors and human factors.
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