针对目前的非局地热力学平衡(NLTE) 大气辐射传输模型计算速度慢的不足,引入了计算速度快、计算精 度较高的带模式算法,并建立了大气的NLTE临边辐射快速计算模型。首先基于分子上下能级布居计算了 大气振动温度廓线。然后依据大气的动力学温度、振动温度与配分函数计算了偏离系数和吸收截 面因子。最后提出了半球累加方法解算NLTE临边辐射传输方程。计算分析了1976 U.S.大气模式下 的大气振动温度与吸收截面因子廓线,并给出了典型切向高度时CO2 15 μm波段在白天的临边辐射 亮度。通过基于逐线积分算法的SHARC模型,验证了本模型计算结果的正确性。本模型进行一次NLTE辐 射计算仅需耗费数秒,且具有理想的光谱分辨率(1 cm-1)。

Aiming at solving low computation speed of present non local thermodynamic equilibrium (NLTE) atmospheric radiative transfer model, band model algorithm with high speed and fine accuracy was applied, and NLTE atmospheric radiative transfer model was established. Firstly, vibrational temperature profile was calculated based on the upper and lower level populations. Secondly, departure coefficient and cross section factor were calculated according to atmospheric kinetic temperature, vibrational temperature and partition function. Finally, hemisphere adding method was proposed to solve NLTE radiative transfer equation in limb geometry. Vibrational temperature and cross section factor profile were calculated and analyzed in 1976 U.S. Atmospheric Mode, and atmospheric NLTE limb radiances in daytime of CO2 in 15 μm band at typical tangent heights were investigated. The rapid calculation model was validated by SHARC based on line-by-line algorithm. The rapid calculation model only consumes a few seconds per time, and with fine spectral resolution(1 cm-1).