摘要
本文发展了一种新的计算大气气体吸收系数以及冷却率的快速数值方法， 并对影响逐线积分精度和计算时间的各种因子进行了详细研究。以大气主要吸收气体ＣＯ２ １５ μｍ带的５００～８００ ｃｍ － １波段为例， 将新方法计算的吸收系数、大气透过率和冷却率结果与经典的逐线积分方法进行了比较。对从地面到１００ ｋｍ 范围的整层大气， 大气透过率的误差不超过０．０００４； 对７０ ｋｍ 以下的大气， 大气冷却率的误差不超过０．００４ Ｋ／ｄ， 而计算时间却节省１～２ 个数量级左右。
A new Line-by-Line (LBL) integration algorithm for calculating spectral absorption coefficients, atmospheric transmittance and cooling/heating rates is developed in this paper The factors affecting the accuracy and calculating time in the LBL calculation are discussed in detail Taking an example of CO 2 15 μm band, comparisons are made for the transmittance differences and cooling/heating rates differences between computations by the new method and by the “exact” method From 2 km above the surface to the altitude of 100 km, the calculation errors of the integral transmittance are not larger than 0 0004% For the atmosphere lower than 70 km, the cooling/heating rate errors are not larger than 0 004 K/day The calculating time by the new method, however, is only one tenth of the “exact” LBL method
出处
《大气科学》
CSCD
北大核心
2000年第1期111-121,共11页
Chinese Journal of Atmospheric Sciences
基金
中国科学院安徽光学精密机械研究所国家863 计划大气光学重点实验室开放课题资助
关键词
大气吸收
逐线积分
线翼截断
计算法
大气气体
atmospheric absorption
line-by-line integration
cutoff of the line wings
