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介绍了用于探测对流层大气臭氧的L6 2 5差分吸收激光雷达系统 ,叙述了该激光雷达的结构、探测大气臭氧的原理和数据处理方法。利用波长对 2 89～ 2 99nm和 2 89～ 30 8nm对合肥上空中、上部对流层的臭氧进行了对比测量。测量结果表明 ,这两对波长的测量结果差别约在 10 %左右。分析了 2 89～ 30 8nm波长对测量臭氧的结果和误差。 10km以下 ,2 89～ 30 8nm波长对测量的对流层臭氧统计误差绝对值一般小于 2× 10 11molecules/cm3 ,忽略气溶胶影响引起的相对系统误差一般小于 4 %。给出和分析了合肥地区对流层 5～ 15km臭氧柱含量的季节变化特征 ,柱含量最大的月份一般出现在第二季度 ,柱含量最小的月份一般出现在第三季度。
The L6 2 5 differential absorption laser radar system for detecting tropospheric atmospheric ozone is introduced. The structure of the laser radar, the principle of detecting atmospheric ozone and the data processing methods are described. The wavelength of 2 89 ~ 2 99nm and 2 89 ~ 30 8nm Hefei over the upper troposphere ozone contrast measurements. The measurement results show that the difference between the two pairs of wavelengths is about 10%. The results and errors of measuring ozone at 2 89 ~ 30 8 nm were analyzed. The absolute value of tropospheric ozone statistics error of less than 10km and 2 89 ~ 30 8nm is generally less than 2 × 10 11molecules / cm 3, while ignoring the relative systematic error caused by aerosol effect is generally less than 4%. The seasonal variation characteristics of ozone column in the troposphere from 5 to 15km in Hefei area are given and analyzed. The month with the largest column content generally appears in the second quarter, and the month with the lowest column content generally appears in the third quarter.