冰云-气体谱带内光学相关性对辐射计算和气候模拟的影响研究

This project will study the effects of in-band optical correlation between ice cloud and gas on radiation calculating and climate modeling. As ignoring the in-band correlation between ice cloud and gas, the band-average scheme of ice cloud optical properties widly used in atmospheric radiation calculating results large calculating error. A new ice cloud correlated k-distribution scheme will be developed, considering the in-band optical correlation between ice cloud and gas; it will be applied into radiation transferm model to study its effect on radiation calculating and quantitatively evaluate the error in different atmospheric conditions caused by the new scheme and the troditional band-average scheme. Then, this project will apply the new ice cloud correlated k-distribution scheme into a global climate model to analysis the effects of the in-band optical correlation between ice cloud and gas on climate modeling.

本项目将重点研究已划分的谱带区间内冰云-气体光学相关性及其对辐射计算和气候模拟的影响。在大气辐射计算中广泛使用的冰云光学性质谱带平均方法忽略了谱带内冰云光学性质与气体吸收的相关性，会造成大量计算误差。本项目拟发展一种新的可以考虑冰云-气体谱带内光学相关性的冰云相关k-分布辐射方案，考察其在单柱辐射传输模式中对辐射计算的影响，定量评估新方案与传统谱带平均方案在各种大气条件下造成的误差；其次，将新的冰云相关k-分布方案应用于全球气候模式中，详细分析冰云-气体谱带内光学相关性对气候模拟的影响。

本项目发展了一种新的可以考虑冰云-气体谱带内光学相关性的冰云相关k-分布辐射方案，考察其在单柱辐射传输模式中对辐射计算的影响，定量评估新方案与传统谱带平均方案的区别。冰云-气体谱带内光学相关性对长波辐射计算有较大影响，导致云层以上长波向上辐射通量增加约4.1W/m2。