L625差分吸收激光雷达探测对流层臭氧

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。

L625 Differential Absorption Lidar System for Tropospheric Ozone Measurements

The L625 differential absorption lidar (DIAL) is introduced to measure vertical ozone profiles in the troposphere. System structure, measurement principle and data processing are also described. Comparison measurements of middle and upper tropospheric ozone are made with a couple of wavelength pairs of 289～299 nm and 289～308 nm at Hefei. Measurement results show that the differences between this couple is about 10%. Statistic errors below 10 km altitude are usually less than 2×1011 molecules per cubic centimeter in tropospheric ozone measurement by wavelength pair of 289～308 nm. Systematic errors due to aerosol loading are commonly less than 4%. Characteristics of seasonal variation of tropospheric ozone column contents from 5～15 km altitude are given and analyzed over Hefei. Maximal tropospheric ozone column contents occurred in the second quarter and minimal contents in the third quarter.