温度与发射率分离模型的改进及其敏感性分析

MODIFICATION OF TEMPERATURE AND EMISSIVITY SEPARATION MODEL AND ITS SENSITIVITY ANALYSIS

针对温度与发射率分离模型的缺陷,提出了一种模型改进方法,利用模拟数据对比研究了模型改进前后温度与发射率的反演精度;并从理论分析和模拟计算两个角度探讨了修正前后模型对初始发射率设定的变化、大气下行与上行辐射和大气透过率等校正误差的敏感程度.研究结果表明,修正后模型的反演精度明显高于修正前的模型,除大气下行辐射校正误差外,其它误差都影响着两种模型的反演精度,但修正后的模型对这些误差的敏感性小.

According to the deficiency of temperature and emissivity separation （TES） model, a modified method of TES was presented. Simulated data were used to compare the precision of temperature and emissivity retrieved separately from before and after model modification. The sensitivity of TES and MTES model to the variety of initial setted emissivity, calibration error of atmospheric upwelling, downwelling radiation and transmission was then analyzed by way of theoretically analysis and simulated computation. Results show that the retrieval precision of MTES model is higher than that of TES model. Except for the calibration error of atmospheric downwelling radiation, other errors affect the precision of the two models, but MTES model is less sensitive to these errors.