五台山大气CO_(2)本底浓度及源汇特征  

Studies on background concentration and source-sink characteristics of CO_(2) in Wutai Mountain

作　　者：李莹 闫世明 王淑敏 张逢生 于小红 杨爱琴 岳江 靳泽辉 LI Ying;YAN Shi-ming;WANG Shu-min;ZHANG Feng-sheng;YU Xiao-hong;YANG Ai-qin;YUE Jiang;JIN Ze-hui(Shanxi Institute of Meteorological Sciences,Shanxi Branch of Monitoring and Assessment Center forGHGs&Carbon Neutrality,China Meteorological Administration,Taiyuan 030002,China;Wutaishan Meteorological Station,Wutaishan Cloud Physics Field Experiment Base,China Meteorological Administration,Xinzhou 035515,China)

机构地区：[1]山西省气象科学研究所,中国气象局温室气体及碳中和监测评估中心山西分中心,山西太原030002 [2]五台山气象站,中国气象局五台山云物理野外科学试验基地,山西忻州035515

出　　处：《中国环境科学》2022年第8期3572-3583,共12页China Environmental Science

基　　金：山西省基础研究计划青年科学研究项目(20210302124617);山西省气象局面上项目(SXKMSDW20217114)。

摘　　要：基于五台山站2017年1月~2020年12月的大气CO_(2)连续观测资料,采用平均移动过滤法(MAF)和后向轨迹分析方法,对五台山大气CO_(2)本底浓度及源汇特征进行研究.结果表明:五台山大气CO_(2)浓度受到区域或局地源汇的影响,筛分后的CO_(2)本底小时浓度振幅为44.9×10^(-6),小于未经筛分的CO_(2)浓度振幅94.7×10^(-6).2017~2020年CO_(2)本底浓度呈逐年上升趋势,但增幅放缓;抬升浓度占比有所下降,吸收浓度占比波动较小,表明人类活动对CO_(2)浓度的影响逐年减弱,而五台山周边地区陆地生态系统碳汇作用相对稳定.CO_(2)本底浓度夏季最低,秋冬季次之,春季最高;日变化夏季最明显,峰谷值分别出现在05:00和16:00,其他季节日振幅仅在0.7×10^(-6)~1.8×10^(-6)之间.与本底浓度相比,抬升浓度的差异值自10月至翌年3月明显增大,而吸收浓度的差异值在6~9月最显著,分别反映出人为活动排放源以及陆地生态系统吸收汇对CO_(2)本底浓度的影响.源汇浓度日变化均为单峰结构,抬升浓度白天高、夜间低,吸收浓度刚好相反.春、秋和冬季造成CO_(2)浓度明显抬升的地面风向主要为西南风,且随风速的增加CO_(2)浓度能够保持较高水平,而夏季主要为东北偏东风;春、夏季,2~4m/s的风速有利于进一步降低CO_(2)吸收浓度.后向轨迹分析表明,气团远距离输送对源汇浓度的影响除了取决于气团途径区域的CO_(2)排放情况,还与气团的空间垂直输送路径有关.Based on the continuous CO_(2)datasets from 2017 to 2020,observed at Wutaishan GHG station,the background concentration and source-sink characteristics of CO_(2)in Wutai Mountain were studied by using the Moving Average Filtering(MAF)method and backward trajectory analysis.The results show that the atmospheric CO_(2)concentrations were affected by regional or local sources/sinks,with the smaller hourly amplitude of background concentration(44.9×10^(-6)),compared to that of unselected CO_(2)concentration(94.7×10^(-6)).The CO_(2)background concentration had slowly increased from 2017 to 2020.Particularly,the proportion of rising concentration had decreased probably due to the weakened human activities.On the contrast,the variation in the absorption concentration was stable,inferring that the effect of terrestrial ecosystem on CO_(2)concentration was relatively stable.The seasonal mean of CO_(2)background concentration was the lowest in summer,secondly in autumn and winter,and the highest in spring.The diurnal variation in CO_(2)background concentration was most obvious in summer,with the peak and valley value around 5:00a.m.and 16:00p.m.,respectively;the diurnal variation fluctuated slightly in other seasons with amplitudes merely between 0.7×10^(-6)and 1.8×10^(-6).Compared to the background concentration,the CO_(2)uplifting concentration differed remarkably from October to March,whereas the change in absorption concentration occurred from June to September,indicating impacts of anthropogenic emission and terrestrial ecosystem carbon absorption on CO_(2)concentration.The diurnal variation in source-sink concentrations displayed a single peak structure,and the rising concentration was high during the day and low at night,and the reversion was just for the absorption concentration.In spring,autumn and winter,the southwest wind was mainly responsible for the significant CO_(2)uplift,and CO_(2)concentration could stay at a high level with an increase in wind speed;while,in summer,the northeast easterly wind obvious

关 键 词：五台山 温室气体 区域本底 源汇特征 

分 类 号：X511[环境科学与工程—环境工程]