大气可降水量卫星遥感反演不确定性对太阳总辐射模拟的影响

辐射传输方程模拟法作为一种较为准确有效的太阳总辐射间接获得方法,其模拟精度受到代入方程的大气参数精度的影响。论文通过将香港2005—2013年卫星遥感反演的大气可降水量产品与地面站数据对比,以68.3%的置信水平分析了卫星遥感反演的大气可降水量的不确定性;并通过收集2005—2013年香港其他影响大气上界太阳辐射到达地表的大气参数,如气溶胶光学厚度、气溶胶单次散射反照率、臭氧含量综合模拟大气环境,确定了大气可降水量的不确定性在夏季和冬季对太阳总辐射模拟（250~2 800 nm）造成的相对误差。研究结果表明,受大气可降水量不确定性影响,使用辐射传输方程法模拟获得的太阳总辐射有1%~3%的相对误差。使用该方法冬季受大气可降水量不确定性影响程度比夏季大。决定相对误差大小的主要因素是波长,大气水汽吸收作用强的波长上,相对误差也大;其次因素是太阳天顶角,太阳天顶角越大,该方法模拟所得太阳总辐射相对误差越大。研究为大气可降水量参数不确定性影响下太阳总辐射模拟的误差评估提供了依据。

The Impact of Uncertainty in Satellite Remote Sensing Retrieval of Water Vapor Column on Simulation of Global Solar Radiation

The radiative transfer equation simulation method is an accurate and effective way to obtain global solar radiation indirectly. However, the accuracy of this method is affected by the atmospheric parameters input into the equation. The satellite remote sensing retrieval of water vapor column is analyzed to be at 68.3% confidence level based on comparing the satellite remote sensing products with ground measured data in the period of 2005-2013 in Hong Kong. After collecting other related atmospheric parameters between 2005 and 2013, such as aerosol optical depth, aerosol single scattering albedo, and Total Column Ozone, which affect the transmission of solar radiation, the basic atmospheric environment is simulated. The relative error of global solar radiation simulation (250-2 800 nm) is obtained by running the radiative transfer calculation library in the basic atmospheric environment. The conclusion shows that the relative error of global solar radiation simulation is 1%-3%. The relative error is higher in winter than in summer. The primary factor that decides the relative error is wavelength. The relative error is bigger at the wavelength that has a strong absorption of water vapor. The secondary factor is solar zenith angle. The relative error is bigger to estimate global solar radiation with the radiative transfer simulation method when the solar zenith angle is bigger. The conclusion offers an important reference to the error control when using the radiative transfer equation simulation method to get the global solar radiation.