本文選題：氣溶膠光學(xué)厚度　切入點：改進暗像元法　出處：《山東農(nóng)業(yè)大學(xué)》2017年碩士論文

【摘要】：氣溶膠含量是關(guān)系空氣質(zhì)量的重要指標(biāo),對于全球能量平衡、陸地生態(tài)系統(tǒng)的良性循環(huán)有著重要的作用。大氣氣溶膠光學(xué)厚度(Aerosol Optical Thickness,AOT)是表征大氣渾濁度的重要物理量,是氣溶膠監(jiān)測最重要的參數(shù)之一。本研究借助MODIS遙感影像與太陽光度計CE318實測數(shù)據(jù),利用改進暗像元法、Flaash大氣校正法與6S輻射傳輸模型,構(gòu)建了自定義的濟南市氣溶膠模型。基于濟南市氣溶膠模型,制作精準(zhǔn)AOT查找表,反演得到濟南地區(qū)AOT;建立了濟南地區(qū)AOT與PM2.5含量的數(shù)學(xué)模型;通過與檢驗數(shù)據(jù)對比分析,驗證了模型的有效性;結(jié)合IDL語言,流程化反演過程,開發(fā)了氣溶膠反演系統(tǒng)。主要研究內(nèi)容及結(jié)論如下:(1)結(jié)合改進暗像元法與Flaash大氣校正法,計算MODIS影像地表反射率。應(yīng)用改進暗像元法計算研究區(qū)暗地表反射率,Flaash大氣校正法計算研究區(qū)亮地表反射率,兩者結(jié)合實現(xiàn)研究區(qū)MODIS影像地表反射率計算。比較AOT反演結(jié)果,改進暗像元法與Flaash大氣校正結(jié)合法的反演結(jié)果較單一改進暗像元法反演結(jié)果的連續(xù)性更好,空值區(qū)域更少。(2)建立了濟南市氣溶膠模型與PM2.5反演模型,實現(xiàn)濟南市AOT以及PM2.5反演。根據(jù)濟南市的大氣條件以及區(qū)域特征,假定氣溶膠中四種組分的比重,通過太陽光度計觀測數(shù)據(jù)與MODIS影像相結(jié)合,構(gòu)建了自定義的濟南市氣溶膠模型。本文計算得到濟南市氣溶膠模型為沙塵性氣溶膠比重40%,水溶性氣溶膠比重56%,海洋性氣溶膠比重1%,煤煙性氣溶膠比重3%。分別基于自定義氣溶膠模型、大陸型氣溶膠模型、城市型氣溶膠模型制作AOT查找表進行AOT的反演,將反演結(jié)果與MOD04氣溶膠產(chǎn)品以及太陽光度計實測數(shù)據(jù)對比分析,結(jié)果表明:自定義氣溶膠模型的AOT反演精度明顯高于大陸型和城市型氣溶膠模型的反演精度,自定義氣溶膠模型對濟南市AOT的精確反演具有巨大潛力。建立了濟南市AOT與PM2.5含量的數(shù)學(xué)模型xy(10)(28)008.0049.0,2R為0.424。驗證PM2.5反演模型的反演結(jié)果與檢驗數(shù)據(jù)的相關(guān)性,相關(guān)系數(shù)為0.767。(3)開發(fā)氣溶膠反演系統(tǒng),流程化反演過程。IDL編寫AOT、PM2.5反演程序,完成氣溶膠反演系統(tǒng)的開發(fā),提高濟南市AOT與PM2.5的反演效率。
[Abstract]:Aerosol content is an important index related to air quality and plays an important role in global energy balance and the benign cycle of terrestrial ecosystem.Atmospheric aerosol optical thickness (AOT) is one of the most important parameters of aerosol monitoring. It is an important physical quantity to characterize atmospheric turbidity.In this study, a self-defined aerosol model in Jinan was constructed by using the MODIS remote sensing image and the CE318 measured data of the solar photometer, using the improved dark pixel method, Flaash atmospheric correction method and the 6s radiation transfer model.Based on Jinan aerosol model, the accurate AOT lookup table is made to retrieve the content of AOT and PM2.5 in Jinan area. The mathematical model of AOT and PM2.5 content in Jinan area is established. The validity of the model is verified by comparing with the test data.The aerosol inversion system is developed based on the flow inversion process.The main contents and conclusions are as follows: (1) combined with the improved dark pixel method and Flaash atmospheric correction method, the surface reflectivity of MODIS image is calculated.The improved dark pixel method is used to calculate the dark surface reflectance of the study area and the Flaash atmospheric correction method is used to calculate the bright surface reflectance of the study area. The calculation of the surface reflectance of the MODIS image in the study area is realized by the combination of the two methods.Compared with the AOT inversion results, the inversion results of the improved dark pixel method and the Flaash atmospheric correction method are more continuous than those of the single improved dark pixel method, and the empty value region is less. The aerosol model and the PM2.5 inversion model of Jinan City are established.The inversion of AOT and PM2.5 in Jinan is realized.According to the atmospheric conditions and regional characteristics of Jinan, a self-defined aerosol model of Jinan was constructed by combining the observation data of solar photometer with the MODIS image, assuming the specific gravity of the four components in the aerosol.In this paper, the aerosol model of Jinan is calculated as dust aerosol weight 40, water soluble aerosol specific gravity 56, oceanic aerosol weight 1, soot aerosol specific gravity 3.Based on the customized aerosol model, the continental aerosol model and the urban aerosol model, the AOT lookup table is made for the inversion of AOT. The inversion results are compared with the measured data of MOD04 aerosol products and solar photometers.The results show that the AOT inversion accuracy of the self-defined aerosol model is obviously higher than that of the continental aerosol model and the urban aerosol model. The self-defined aerosol model has great potential for accurate inversion of AOT in Jinan.A mathematical model for the content of AOT and PM2.5 in Jinan was established.To verify the correlation between the inversion results of the PM2.5 inversion model and the test data, the correlation coefficient is 0.767.03) the aerosol inversion system is developed.The inversion efficiency of AOT and PM2.5 in Jinan is improved.
【學(xué)位授予單位】：山東農(nóng)業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X87;X513

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