输入参数的不确定对激光大气分子透过率计算结果的影响

研究分子光谱和气象参数的不确定对单色吸收系数和对应的科线路径透过率计算结果的影响,并导出一般的误差表达式。数值计算表明,对所采用的大气廓线和分子光谱参数,其典型的不确定将导致透过率计算结采的标准相对误差大于3■,吸收系数和透过率对谱线频率、强度、半宽以及大气温度廓线的不确定最为灵敏。

THE INFLUENCE OF UNCERTAINTIES OF INPUT PARAMETERS ON CALCULATIONAL RESULTS OF LASER MOLECULAR TRANSMITTANCE

The variance of monochromatic absorption coefficient and corresponding slant-path molecular transmittance due to errors in the molecular spectroscopic parameters and in the meteorological profiles is studied. General mathematical expressions for the variance are derived, which are simple and convenient to use in the calculation of specific atmospheric profiles and spectral line data. The numerical calculation results indicate that standard relative error larger than 3% should be reasonably along vertical atmospheric paths. The absorption coefficient and the vertical path monochromatic transmittance are most sensitive to uncertainties of the line position, line intensity, line half-width and atmospheric temperature profile.