合肥大气下行长波辐射估算模型研究与改进

大气下行辐射是地表辐射和能量平衡中的一个关键参数, 在反演地表温度和发射率、开展气候变化研究 中起着关键作用。基于现有的大气下行辐射测量方法的分析比较, 开展了合肥大气下行长波辐射的研究。利用 MODTRAN 辐射传输模型模拟计算了合肥大气下行辐射通量, 并以该方法获取的大气下行辐射通量为基准, 对广 泛应用的个晴天经验模型进行性能评价, 验证了 Idso 模型和 Ångstrom ¨ 模型对于合肥大气条件的适用性。进而利用 MODTRAN 辐射传输模型模拟数据对 Idso 模型中的参数进行修正, 提高了该模型的模拟精度。该研究为方便快捷准 确地获取合肥大气下行辐射通量提供了可靠方法。

Research and improvement of atmospheric downward longwave radiation estimation model for Hefei

Atmospheric downward radiation is a key parameter in surface radiation and energy balance. It plays a key role in retrieving surface temperature and emissivity and in the study of climate change. Based on the analysis and comparison of the existing atmospheric downward radiation measurement methods, the research of Hefei atmospheric downward longwave radiation is carried out. Hefei downward atmospheric radiant flux is simulated and calculated by using MODTRAN radiation transmission model, and then taking the atmospheric downward radiant flux obtained by this method as benchmark, the performance of the widely used sunny day empirical model is evaluated, and the applicability of Idso model and Ångstrom model to Hefei atmospheric conditions is verified. In ¨ addition, the parameters in the Idso model are modified by using MODTRAN radiation transmission model simulation data to improve the simulation accuracy of the model. This study provides a reliable method for conveniently, quickly and accurately obtaining Hefei atmospheric downward radiant flux.