长沙城区大气中二氧化碳浓度变化及与其它污染物相关性分析

利用长沙市城区2011年及2012年连续自动监测获得的CO2数据，两年的平均值为412．2×10^-6,高于世界本底站青海瓦里关5．6％，与临安、无锡相当，略高于乌鲁木齐，而低于北京、上海。冬季CO2浓度日小时变化呈现双峰形态，峰值出现在上午9时及晚上19时～21时。夏季日小时变化为单峰形态，峰值出现在上午8时。冬季CO2浓度日均值为420．3×10^-6，比夏季高3．4％。CO2除与O3呈负相关以外，与其它污染物均呈现显著性正相关，特别是与CO、NO、NO2、NOx、SO2的相关性最强，而与颗粒物（PM10、PM25）的相关性稍差。

Analysis of Atmospheric CO2 Concentration Variation and the Correlation with Other Pollutants in Changsha Urban Area

Based on the continuous automatic CO2 monitoring data in Changsha urban area in 2011,2012, the average value of the two years was 412. 2 ×10-6, which was 5.6% higher than the world＇s background station Qinghai Waliguan, comparable to Ling＇an, Wuxi, slightly higher than Urumqi, but lower than Beijing and Shanghai. Winter CO2 concentration hourly variation present bimodal pattern, peak appeared at 9 in the morning and evening 19 -21. Summer CO2 concentration hourly vairation present a unimodal pattern, peak at 8 in the morning. Winter CO2 average concentration is 420. 3 ×10-6,3.4% higher than the summer. CO2 was negatively correlated with 03 and positively correlated with all other pollutants, particularly strongly correlated with CO, NO, NO2, NOx and SO2, less correlated with particulate matter （PM10 and PMzs）.