本文選題：氣溶膠光學(xué)厚度 + AERONET��； 參考：《東華大學(xué)》2017年碩士論文

【摘要】：本文基于MODIS_C051和C006產(chǎn)品反演的AOD值與地基觀測AERONET對比分析,評估其在中國中東部4種下墊面(城市、郊區(qū)、森林和水體)的適用性和精確度。呈現(xiàn)了中國中東部、三大重點區(qū)域(京津冀、長三角、珠三角)及十大城市2003~2015年AOD值的時空特征;揭示了2013~2014年上海地區(qū)AOD的空間分布規(guī)律,并分析其與地面PM_(2.5)質(zhì)量濃度的相關(guān)性;最后對一次持續(xù)性霧霾過程進行分析,研究其不同天氣現(xiàn)象的光學(xué)特性垂直分布和轉(zhuǎn)化機制。主要結(jié)論如下:1、MODIS與AERONET對比結(jié)果表明,MODIS AOD在不同下墊面的擬合度和精度均較高(R0.8,R~20.7),滿足大氣環(huán)境質(zhì)量要求。擬合度表現(xiàn)為郊區(qū)(香河)城市(北京)水體(太湖)森林(興隆);反演精度最低的是水體,最高的是城市;氣溶膠單次反照率(SSA)在城市、郊區(qū)和森林的傾向高估,而水體低估;地表反照率對4種下墊面都存在低估,且森林最為嚴(yán)重。相較于MODIS_10km,MODIS_3kmAOD值對郊區(qū)的擬合效果更好,而對城市較差,反演精度有提升,SSA和地面反照率均傾向高估,區(qū)域反演AOD均值更接近實際觀測值。2、中東部地區(qū)AOD值13年空間污染演變結(jié)果顯示,AOD高值區(qū)主要分布在長三角、珠三角以及山東與河北交界處并向四周遞減;2003年以來,中東部AOD值呈現(xiàn)出不同程度的增長,2008年最高;京津冀高值區(qū)(AOD0.7)分布于石家莊、天津;長三角高值區(qū)集中于上海及江蘇省,并由西北向東南方向遞減;珠三角高值區(qū)分布在其中南區(qū)域,由佛山向四周擴散。中東部AOD最大值出現(xiàn)在4月,最小值出現(xiàn)在9月,春季最大,秋季最小;京津冀、長三角和珠三角及其重點城市AOD極大值均出現(xiàn)在4~6月,極小值出現(xiàn)在11~12月。3、3km_C006 AOD對沿海區(qū)域的適用性較好,C051 AOD對城市和植被分布較多的區(qū)域適用性更優(yōu);AOD與地面PM_(2.5)的全年直接相關(guān)性均高于類似研究。經(jīng)高度和濕度訂正后,二者全年和季節(jié)的相關(guān)系數(shù)和擬合度均明顯提高,且濕度訂正更好。相較于C051AOD,3K_C006 AOD經(jīng)濕度訂正后全年和季節(jié)的相關(guān)性更高,且冬季最高,春季較低;全年和各季擬合模型相關(guān)性最高的均為一元三次模型,接著以對數(shù)、乘冪和指數(shù)模型依次遞減;采用最優(yōu)擬合模型反演的PM_(2.5)與實測值相關(guān)性較好,證實了C051和3k_C006AOD經(jīng)濕度訂正后均可作為上海地區(qū)監(jiān)測PM_(2.5)質(zhì)量濃度的有效手段。4、三種天氣現(xiàn)象發(fā)生順序為濕霾→干霾→濕霾及濕霾→霧→干霾→濕霾,對能見度的影響程度依次為:相對濕度溫度風(fēng)速PM_(2.5)。CALIPSO探測期間,2-3km處存在明顯氣溶膠層,且不同天氣現(xiàn)象的厚度不同(霧濕霾干霾);霧霾發(fā)生期間,1km以下氣溶膠消光能力最大;在干霾、濕霾到霧的轉(zhuǎn)化過程中,大粒徑球形氣溶膠增多,小粒徑非球形減少。
[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.
【學(xué)位授予單位】：東華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X513;X87

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