江西千烟洲区域大气二氧化碳浓度观测研究

Monitoring of CO_2 Concentration in the Atmosphere Over Qianyanzhou Area,Jiangxi

于2013年3月—2014年3月,利用位于江西省泰和县中国科学院千烟洲生态站的CO_2自动分析仪对CO_2浓度进行观测,分析CO_2监测数据和同步的气象观测资料,研究了千烟洲所代表的华东地区背景CO_2浓度水平以及变化特征,厘清了影响该区域气团的轨迹。结果表明,CO_2平均体积分数为409.2×10-6;CO_2浓度有明显的日变化特征,最高值出现在07:00左右,最低值出现在15:00左右;季节变化特征也较明显,冬季浓度最高,而夏季最低。除了人类活动之外,植物的光合作用以及边界层高度也是影响CO_2浓度的主要因子。后向轨迹与影响概率场分析结果显示,千烟洲CO_2的主要来源为东北侧的长江三角洲和北方的城市地区。

Carbon dioxide ( CO2 ) is an important greenhouse gas and a recognized contributor to the global warming. An observation site equipped with an automatic CO2 monitoring analyzer was set up at the Qianyanzhou Experiment Station of the Chinese Ecosystem Research Network, Chinese Academy of Sciences in Jiangxi Province, to monitor CO2 concentration in the atmosphere. The monitoring data during the period from March 2013 to March 2014 and synchronous meteorological data were analyzed to explore background CO2 concentration in the air of the region as representative of East China and its variation characteristics, as well as track of the air mass that influences the region. Results show that the mean CO2 volume fraction concentration of the region was 409. 2×10-6. CO2 concentration varied sharply in a day, peaking at 07:00 and bot-toming at 15:00 and also in a year with the seasons, being the highest in winter and the lowest in summer. Besides the im-pact of human activities, vegetation photosynthesis and altitude of the boundary layer were all main factors affecting CO2 concentration in the atmosphere. Backward trajectory and PSCF ( potential source contribution function) analysis reveals that CO2 in the atmosphere of Qianyanzhou comes mainly from its northeast, the Yangtze River Delta region and its north, the cities in North China.