中国中东部大气颗粒物光学特性卫星和地面遥感的联合监测研究

发布时间：2018-05-06 14:08

本文选题：气溶胶光学厚度 + AERONET　；参考：《东华大学》2017年硕士论文

【摘要】：本文基于MODIS_C051和C006产品反演的AOD值与地基观测AERONET对比分析,评估其在中国中东部4种下垫面(城市、郊区、森林和水体)的适用性和精确度。呈现了中国中东部、三大重点区域(京津冀、长三角、珠三角)及十大城市2003~2015年AOD值的时空特征;揭示了2013~2014年上海地区AOD的空间分布规律,并分析其与地面PM_(2.5)质量浓度的相关性;最后对一次持续性雾霾过程进行分析,研究其不同天气现象的光学特性垂直分布和转化机制。主要结论如下:1、MODIS与AERONET对比结果表明,MODIS AOD在不同下垫面的拟合度和精度均较高(R0.8,R~20.7),满足大气环境质量要求。拟合度表现为郊区(香河)城市(北京)水体(太湖)森林(兴隆);反演精度最低的是水体,最高的是城市;气溶胶单次反照率(SSA)在城市、郊区和森林的倾向高估,而水体低估;地表反照率对4种下垫面都存在低估,且森林最为严重。相较于MODIS_10km,MODIS_3kmAOD值对郊区的拟合效果更好,而对城市较差,反演精度有提升,SSA和地面反照率均倾向高估,区域反演AOD均值更接近实际观测值。2、中东部地区AOD值13年空间污染演变结果显示,AOD高值区主要分布在长三角、珠三角以及山东与河北交界处并向四周递减;2003年以来,中东部AOD值呈现出不同程度的增长,2008年最高;京津冀高值区(AOD0.7)分布于石家庄、天津;长三角高值区集中于上海及江苏省,并由西北向东南方向递减;珠三角高值区分布在其中南区域,由佛山向四周扩散。中东部AOD最大值出现在4月,最小值出现在9月,春季最大,秋季最小;京津冀、长三角和珠三角及其重点城市AOD极大值均出现在4~6月,极小值出现在11~12月。3、3km_C006 AOD对沿海区域的适用性较好,C051 AOD对城市和植被分布较多的区域适用性更优;AOD与地面PM_(2.5)的全年直接相关性均高于类似研究。经高度和湿度订正后,二者全年和季节的相关系数和拟合度均明显提高,且湿度订正更好。相较于C051AOD,3K_C006 AOD经湿度订正后全年和季节的相关性更高,且冬季最高,春季较低;全年和各季拟合模型相关性最高的均为一元三次模型,接着以对数、乘幂和指数模型依次递减;采用最优拟合模型反演的PM_(2.5)与实测值相关性较好,证实了C051和3k_C006AOD经湿度订正后均可作为上海地区监测PM_(2.5)质量浓度的有效手段。4、三种天气现象发生顺序为湿霾→干霾→湿霾及湿霾→雾→干霾→湿霾,对能见度的影响程度依次为:相对湿度温度风速PM_(2.5)。CALIPSO探测期间,2-3km处存在明显气溶胶层,且不同天气现象的厚度不同(雾湿霾干霾);雾霾发生期间,1km以下气溶胶消光能力最大;在干霾、湿霾到雾的转化过程中,大粒径球形气溶胶增多,小粒径非球形减少。
[Abstract]:Based on the comparative analysis of AOD values of MODIS_C051 and C006 products and ground-based observation AERONET, this paper evaluates the applicability and accuracy of the four underlying surfaces (urban, suburban, forest and water) in the central and eastern part of China. The spatial and temporal characteristics of AOD values in three key regions (Beijing-Tianjin-Hebei, Yangtze River Delta, Pearl River Delta) and ten cities in central and eastern China from 2003 to 2015 are presented, and the spatial distribution of AOD in Shanghai from 2013 to 2014 is revealed. The correlation between the mass concentration and the mass concentration of surface haze was analyzed. Finally, the vertical distribution and transformation mechanism of optical properties of different weather phenomena were studied by analyzing a continuous haze process. The main conclusions are as follows: (1) the comparison between MODIS and AERONET shows that the fitting degree and accuracy of MODIS AOD on different underlying surfaces are higher than that of R0.8 and R0. 7, which meet the requirements of atmospheric environmental quality. The fitting degree shows that the forest of the water body (Taihu Lake) in the suburb (Xianghe) city (Beijing) (Taihu Lake); the lowest inversion accuracy is the water body, the highest is the city; the single albedo of aerosol is overestimated in the city, suburb and forest. The surface albedo was underestimated to the four underlying surfaces, and the forest was the most serious. Compared with MODIS10km, MODIS-3kmAOD is better for the suburbs, but for the cities, the inversion accuracy is improved and the SSA and the surface albedo tend to be overestimated. The regional inversion AOD mean value is closer to the actual observed value. The results of 13 years spatial pollution evolution of the AOD value in the central and eastern regions show that the high value areas are mainly distributed in the Yangtze River Delta, the Pearl River Delta and the border between Shandong and Hebei. In the middle and eastern part of China, the AOD value increased to different degrees, the highest in 2008; the high value area AOD0.7in Beijing-Tianjin-Hebei region was distributed in Shijiazhuang and Tianjin; the high value area of Yangtze River Delta was concentrated in Shanghai and Jiangsu Province, and decreased from northwest to southeast. The high value area of the Pearl River Delta is distributed in the south of the region, spreading from Foshan to the surrounding area. The maximum value of AOD appears in April, the minimum in September, the largest in spring and the smallest in autumn, the maximum of AOD in Beijing-Tianjin-Hebei, Yangtze River Delta, Pearl River Delta and its key cities appears in April ~ June. The applicability of C006 AOD to coastal areas is better than that of C051 AOD. The direct correlation between C051 AOD and surface PMSP 2.5 is higher than that of similar studies. After the height and humidity were revised, the correlation coefficient and the fitting degree of both the whole year and the season were obviously improved, and the humidity correction was better. Compared with C051 AODX 3KC006 AOD, the correlation between the whole year and season is higher than that of C051 AODX 3KC006 AOD, and it is the highest in winter and lower in spring. The best fitting model is used to invert PMports 2.5), which has good correlation with the measured values. It has been proved that C051 and 3k_C006AOD can be used as effective means to monitor the mass concentration of 3k_C006AOD (2.5) in Shanghai area. The three weather phenomena occur in the order of wet haze and wet haze, and the order of occurrence of the three weather phenomena is as follows: wet haze and wet haze. The degree of influence on visibility is as follows: there is obvious aerosol layer at 2-3km during PM_(2.5).CALIPSO detection of relative humidity, temperature and wind speed, and the thickness of different weather phenomena is different (haze dry haze), the extinction ability of aerosol below 1 km during the occurrence of haze is the largest. In the process of transformation from dry haze and wet haze to fog, the spherical aerosol with large particle size increased and the non-spherical aerosol with small particle size decreased.
【学位授予单位】：东华大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X513;X87

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