| With the accelerating process of China’s urbanization, urban ambient air complex pollution is getting worse, especially the two pollutants O3 and PM2.5. Accurate grasp both time and space distribution of these two pollutants distribution is the basis for the formulation of pollution control measures, and monitoring of ground station monitoring mode of "fanning out from point to area" is difficult to reach the requirement. Therefore only through the means of monitoring remote sensing satellite can achieve the goal.Taking the Sichuan basin as the research background, this paper screened MODIS satellite image of 2014 for the inversion of 41 days, the use of C++ nested 6S radiative transfer model generated look-up table, fast, integrated inversion of aerosol optical depth (AOD), combined with the collection of air humidity and extinction coefficient of National Jiao tong University Station, fitted out Sichuan Basin humidity factor; Using WRF (the Weather Research & Forecasting) and CALMET calculated in Sichuan basin boundary layer height and the output of Jiaotong University Station (30.6973°N,104.0536°E) boundary layer height, and then compared with laser radar monitoring data; Sichuan Basin the "dry" the function relationship between extinction coefficient and ground particle concentration (PM2.5) is established on the basis of humidity factor and boundary layer height to provide scientific support for the realization of the ambient air quality in Sichuan Province Business Forecasting and atmospheric pollution emergency pollution prevention and decision-making.Through the research of remote sensing satellite of the particle concentration in Sichuan basin, as follows:(1) With the use of C++ nested 6S radiative transfer model to join the water vapor content of the Sichuan basin and the ozone content of the inversion of the 41 days of AOD in 2014, plotted January 7th,19th and March 16th,17th and superimposition AOD near the ground (500m) at a flow field, and to be verified by the track after Hysplit, we found two trajectories are very similar. Discussion on the temporal and spatial distribution of optical thickness and the correlation between 0.56 and 0.57 of the original data improved significantly to 0.72 and 0.66 respectively in the 95% confidence interval.(2) The vertical distribution of extinction coefficient in Sichuan basin was found the linear distribution between 100m～670m:y=9.63x10-4x-0.047 and exponential distribution after 1600m:y=1.788e-0.0016r(3) The means of WRF in GBM, shin, TEMF and UW four boundary layer scheme calculation of boundary layer height, and CALMET to the results for guess field, the diagnostic wind field module calculation boundary layer height, and found three mean boundary layer height in the autumn winter (774.3m) than spring and summer (540.7m). The use of laser radar observation and comparison of two models, found that the result of CALMET is closer to the observation than WRF.(4) The function of moisture absorption and relative humidity in the four seasons of Sichuan basin was found by exponential fitting method, and the distribution of moisture absorption growth factor of relative humidity per 5% was calculated by IMPROVE method.(5) The mathematical model of the relationship between Edry particulate matter PMa.sconcentration and "dry"extinction coefficient by index method and IMPROVE method, the correlation between R2 is 0.55 and 0.68, compared with the "wet" and extinction coefficient of correlation between the concentration of PM2.5 there is 0.3968 increased. |
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