Study On Errors Of Surface Shortwave Radiation From Aqua/CERES/SSF And Its Aerosol's Influence Under Clear-sky In Xinjiang

One of the important ways to save energy in buildings is to make full use of solar energy.Xinjiang has abundant solar energy resources,but there are few ground radiation observation stations.Therefore,it is urgent to understand the applicability of terrestrial solar radiation satellite data,so as to provide scientific basis for quantitative estimation,simulation and prediction of ground solar radiation.Based on the surface downwardb short-wave radiation of 2017 Aqua/CERES/SSF and ground-based solar radiation data,the temporal and spatial distribution characteristics of surface solar radiation in Xinjiang was revealed,and then analyzes the CERES/SSF Model A under clearsky conditions.The error of the short-wave radiant flux of Model B on the surface to observe the total solar radiation;Finally,the aerosol optical thickness(AOD)based on the Aqua/CERES/SSF deep blue algorithm and the Chinese Aerosol Ground-based Remote Sensing Monitoring Network(CARSNET)The aerosol optical thickness(AOD)observed in Tazhong station is used to investigate the error of aerosol optical thickness(AOD)in Xinjiang,and the error of AOD change in the inversion process of surface short-wave radiation satellite is analyzed by Fu-Liou radiation transmission mode.The main conclusions are as follows:(1)The daily variation of total solar radiation at 11 ground stations in different seasons in Xinjiang showed a single peak distribution.In spring,the peak of total solar radiation irradiance appears at around 13:00,with the highest peak in Hetian(1042 W?m-2)and the lowest peak in Tacheng(588 W?m-2);in summer,autumn,winter,peak occurs mostly around 14:00,with the highest summer peak and field(1015 W?m-2),Kashi minimum(662 W?m-2),the highest peak in autumn(671 W?m-2),and Altay minimum(398 W?m-2),the peak in winter is still the largest in Hetian,483W?m-2,the smallest is 179 W?m-2,appearing in Urumqi.(2)The annual average spatial distribution of surface short-wave radiation in Xinjiang includes two high-value centers in the Kunlun Mountains and the western Tianshan Mountains,and one lowvalue center in the western Altai Mountains.The spatial distribution of different seasons shows that the southern Xinjiang is obviously higher than the northern Xinjiang and Tuha Basin,and the irradiance interval is 403-1080 W?m-2.The summer and the whole year are similar,and the irradiance interval is 821-1080 W.?m-2,the irradiance interval in autumn is 272-780 W?m-2,which is relatively close to each other.Compared with the distribution in spring,summer,autumn and winter,the Altai Mountains have increased relative to the surrounding area,and the irradiance interval is 216-690 W?m-2,seasonal mean uncertainty is the smallest in Aksu,and the absolute maximum error is only 10.69 W?m-2.(3)The fitting comparison of the downward satellite short-wave radiation and the groundbased solar radiation in Xinjiang satellite shows that the inversion effect of Model B is better than that of Model A.The inversion effect of Model B in southern Xinjiang is better than that in northern Xinjiang and Tuha Basin.And the autumn fitting results are worse than the whole year.Although the fitting Pearson correlation coefficients of Model A and Model B are both above 0.9,both pass the 1% F significance test,but the F value of Model B is at most 6215.53,which is much higher than the maximum F value of Model A(2642.20).The minimum is 427.03,which is higher than the minimum F value of Model A of 216.80.The F value of Model B is higher than 5,000 in 5 stations in southern Xinjiang and less than 5,000 in northern Xinjiang and Tuha Basin.Compared with the whole year,the F value of Model B in autumn has decreased to varying degrees,such as in Aksu,Hotan,Kashi and Sui,respectively: 2793.41,257.65,1572.01,4807.7,in Urumqi,Hami,Yining,Altay and Turpan,the F values decreased by 499.8,3045.8,2076.34,465.37,and 1342.1,respectively.(4)By analyzing the aerosol optical thickness(DB AOD)of the Aqua/CERES/SSF dark blue algorithm and its surface short-wave radiation and ground-based observation of the total solar radiation,it is found that the aerosol optical thickness and radiation change show a good reverse growth law.However,the variation of short-wave radiation difference is different at different stations and time periods,such as: Hami summer AOD interval is 0.1-0.3,difference interval is-150--200W?m-2,autumn AOD interval is 0.1-0.2,poor The value is mostly near 0W?m-2,the maximum is between 150-200W?m-2,and the difference between Hetian and January is as high as 200W?m-2,and the corresponding AOD fluctuates greatly,up to 0.3.The value of AOD in autumn is small and stable,and the difference is close to 0W?m-2.(5)The dark blue algorithm of Aqua/CERES/SSF aerosol optical thickness(DB AOD)has poor applicability in Xinjiang and affects the inversion accuracy of its short-wave short-wave radiation in Xinjiang.The ARES samples of CERES/SSF accounted for 2.41% within the expected error range,8.43% above the upper limit of the expected error,and the proportion below the lower limit of the expected error was as high as 89.16%,and the Pearson correlation coefficient was only 0.42.The ratio of samples was 67.47% falling between 9% and 50%.The simulation of Fu-Liou radiation transmission mode found that if the AOD increased from 0.01 to 0.35,the surface shortwave radiation flux decreased by 62.9 W?m-2.Hami AOD from 0.01 to 0.15,the surface short-wave radiant flux decreased by 20.3 W ? m-2.