合肥科学岛低对流层二氧化碳时空分布特征

依据合肥市科学岛2013~2016年的CO₂体积比浓度廓线，分别从夜间、季节和年度分析了亚热带季风气候的CO₂分布特点和合肥科学岛的CO₂源汇特征.（1）大气CO₂体积比浓度随高度增加而减小，390m的CO₂浓度约为15m浓度的95%，夜间随时间推移浓度增加幅度约5%，天亮时CO₂浓度有减小的趋势；（2）测量点高度大于100m时，季节特征较明显，CO₂体积比浓度夏季最低，冬季最高，浓度相差约10×10^-6；（3）测量点高度大于100m时，2013~2016年CO₂体积比浓度的年分布随高度变化的梯度相关系数大于0.9，体积比浓度年增长约2.1648×10^-6.通过三个时间尺度的CO₂体积比浓度廓线分析得出，CO₂浓度特征是动植物活动和大气运动等共同作用的结果；CO₂长期循环过程中，存在近地面CO₂向高空的传输效应.

Temporal and spatial distribution characteristics of lower troposphere carbon dioxide in Hefei Science Island

Based on the carbon dioxide volume mixing ratio concentration profiles of Hefei Science Island from 2013 to 2016,the distribution characteristics of carbon dioxide in the subtropical monsoon climate and the characteristics of carbon dioxide source and sink in Hefei science island were analyzed from the night,season and year respectively.The concentration of carbon dioxide in the atmosphere decreased with the increase of altitude,the carbon dioxide concentration of 390m was about 95% that of 15m.The concentration of carbon dioxide gradually increased at night (about 5%),while there was a tendency to decrease at drawn.When the measurement height was more than 100m,the obvious seasonal change was shown,with the minimum in summer and the maximum in winter,which the difference in concentration of about 10×10^-6.With a yearly growth rate of about 2.1648×10^-6,the annual distribution of the concentration of carbon dioxide from 2013 to 2016 had no significant difference in the gradient change of the height above 100m,the correlation coefficient was above 0.9,and the volume mixing ratio concentration increased.Through data analysis from three different timescales,it could be concluded that the concentration of carbon dioxide near the ground was greatly influenced by the atmospheric environment.The seasonal distribution of carbon dioxide concentration was the result of a combination of atmospheric movement and the activities of plants and animals.In the process of long-term carbon dioxide cycling,there was a current that the near-surface carbon dioxide transported to a higher altitude.