中文摘要：

利用拉曼激光雷达系统测量了合肥西郊低对流层（2km以下）大气二氧化碳浓度的垂直分布,并对获得的数据进行系统定标和滑动平均处理,反演出大气二氧化碳的垂直浓度廓线。对2014年7月到2015年12月激光雷达观测数据进行反演和统计分析,初步得到了合肥地区低对流层大气二氧化碳垂直浓度廓线的变化规律。结果表明：1）低对流层大气二氧化碳浓度垂直分布随高度增加而减小,在近地面150 m以下浓度较高,变化较剧烈,300m以上大气二氧化碳的浓度廓线趋于平稳;2）低对流层大气二氧化碳垂直浓度廓线呈明显的季节性分布特征,夏季廓线的整体浓度最小,冬季廓线的整体浓度最大;3）低对流层大气二氧化碳垂直分布与月份有一定的相关性,整体廓线约以每年2×10^-6增长。通过实验发现,二氧化碳垂直浓度随着高度增加非单调递减,在大约300-700m高度区间存在二氧化碳富集区,随着天空渐渐变亮,此区间大气二氧化碳浓度有减小的趋势。

英文摘要：

The vertical concentration distribution of lower-troposphere （2 km below） atmospheric CO2 in Hefei western suburb is measured by Raman lidar system. By system calibration and moving average of the data, the vertical concentration profiles of atmospheric CO2 are retrieved. Through statistical analysis of the retrieved results of lidar observation data from July 2014 to December 2015, the variation patterns of lower-troposphere atmospheric CO2 vertical concentration distribution in Hefei western suburb are initially obtained. The results show that the CO2 vertical concentration distribution of lower-troposphere decreases with the increase of altitude, the concentration is rather high and changes intensely under near-surface 150 m, but the concentration of atmospheric CO2 above 300 m is getting stable. The lower-troposphere CO2 vertical concentration distribution shows obvious connection with the season, with a minimum in summer and a maximum in winter. The lower-troposphere atmospheric CO2 vertical distribution shows some correlation with the month, and the whole CO2 vertical concentration goes up with a rate of about 2 ×10^-6 per year. Through the experiments, it is found that the CO2 vertical concentration shows a non- monotonical decrease with the altitude increase. There exists a CO2-rich area from 300 m to 700 m, and the CO2 concentration of this area decreases as the sky turns bright.