徐淮地区冬季AOD时空特征及气象因子研究

Study on the Spatial-temporal Characteristics and Meteorological Factors of Winter AOD in Xuhuai Area

文章基于国产高空间分辨率卫星高分一号(GF-1)的WFV数据实现对徐淮矿区及周边区域的AOD深蓝算法反演和时空特征分析,并结合AERONET站点数据进行反演精度验证。同时,将研究区AOD反演结果与气象因子进行相关性分析。研究结果表明:(1)AOD反演结果与AERONET站点数据相关性较高,相关系数R2为0.899,RMSE为0.158,说明深蓝算法对于矿区及周边城市的AOD反演较适用;(2)研究区2014-2017年AOD高值区呈现逐渐扩张趋势,人口密集区显著高于高植被覆盖区;(3)空气污染时期气溶胶浓度的增长会对气温产生冷却效应,与相对湿度呈一定正相关性,且抑制降水生成。此外,研究区西北部相山的高地形和盛行西北风也可能是阻碍高空气溶胶颗粒物扩散的重要条件。

AOD inversion of deep blue algorithm and space-time feature analysis are realized based on the high spatial resolution satellite GF-1 WFV data in Xuhuai mining area and its surrounding,and the inversion accuracy is validated combined with AERONET site data.Meanwhile,the correlation between AOD inversion results and meteorological factors in the study area is analyzed.The results show that AOD inversion results are highly correlated with AERONET site data,the correlation coefficient(R2)is 0.899 and RMSE is 0.158,indicating that deep blue algorithm is useful for aerosol inversion in mining areas and surrounding cities.From 2014 to 2017,high AOD area in the study area shows a trend of gradual expansion.AOD values in densely populated areas are significantly higher than those in areas with high vegetation coverage.The increase of aerosol concentration has a certain cooling effect on air temperature during the period of air pollution,and then has a positive correlation with relative humidity.It finally restrains the formation of precipitation.Furthermore,the high topography of Xiangshan in the northwest and the prevailing northwest wind of the study area may also be the important conditions that control the diffusion of aerosol particles in the upper air.