【摘要】 中国科学院广州地球化学研究所(GIGCAS)大气CO2观测点的数据显示:2010年10月至2011年11月,该站点大气CO2浓度变化范围为460～550 mL/m3,月平均浓度介于470～530 mL/m3之间,呈现夏、秋季浓度低,春、冬季浓度较高的特点。大气CO2的δ13C值变化介于–9.00‰～–13.10‰之间,月平均值介于–9.60‰～–11.80‰之间,与大气CO2浓度之间关系不显著,反映了人类活动对城市大气CO2的影响。GIGCAS站点大气CO2的Δ14C值波动剧烈,介于29.1‰～–85.2‰之间,月平均值波动范围为4.9‰～–41.7‰,年平均大气CO2的Δ14C值为–16.4‰。较高的Δ14C值出现在夏、秋两季(7～9月),均值约为–5.2‰,较低的Δ14C值出现在冬、春两季(12月至次年4月)、均值约为–27.1‰,据此计算得出的化石源CO2浓度变化范围为1～58 mL/m3,年平均值约24 mL/m3,较低的大气化石源CO2浓度出现在夏、秋两季(7～9月),均值为17 mL/m3,较高大气化石源CO2量出现在冬、春两季(12月至次年4月),均值约为29 mL/m3。气象条件和人类活动对城市大气化石源CO2浓度影响巨大,调整人类活动是减少大气化石源CO2污染的途径之一。更多还原

【Abstract】 During October 2010 to November 2011,the urban atmospheric CO2 concentration observed in Guangzhou Institute of Geochemistry,Chinese Academy of Sciences in Guangzhou ranges from 550 mL/m3 to 460 mL/m3,with the monthly mean concentration fluctuating between 530 mL/m3 and 470 mL/m3.It shows lower concentrations in summer and autumn,and higher concentrations in spring and winter.The CO2 δ 13C values vary between -9.00‰ and -13.10‰,with the monthly mean values fluctuating between -9.60‰ and -11.80‰.The relationship between CO2 concentration and δ 13C values is not significant,reflecting the influence from human activities on the urban atmospheric CO2.The Δ14C values of urban atmospheric CO2 in Guangzhou fluctuate dramatically from 29.1‰ to -85.2‰,with an annual mean value of about -16.4‰.The monthly mean Δ14C values vary between 4.9‰ and -41.7‰.The higher Δ14C values mainly appear in summer and autumn(July to September),and the mean value is about -5.2‰,while,the lower Δ14C values mainly appear in spring(December to April next year) and winter,with an average value of about -27.1‰.According to the Δ14C values,fossil fuel-derived CO2 concentrations are calculated ranges from 1 mL/m3 to 58 mL/m3,with the annual mean concentration of about 24 mL/m3.Correspondingly,the lower fossil fuel-derived CO2 concentrations appear in summer and autumn(July to September) and the mean value is about 17 mL/m3,while,the higher fossil fuel-derived CO2 concentrations appear in spring and winter(December to April next year) and the average value is about 29 mL/m3.Weather conditions and human activities play an important role on the fuel-derived CO2 contributed to urban atmospheric CO2.It is feasible that human can reduce the degree of fuel-derived CO2 pollution in urban atmosphere in Guangzhou through adjusting human activities.更多还原