大气^(14)CO_2观测:2010～2011年广州城市大气中化石源CO_2浓度变化特征  

Fossil fuel-derived CO_2 contribution to the urban atmosphere in Guangzhou, South China by ^(14)CO_2 observation,2010-2011

作　　者：丁平[1] 沈承德[1,2] 易惟熙[1] 王宁[3] 丁杏芳[2] 付东坡[2] 刘克新[2] 

机构地区：[1]中国科学院广州地球化学研究所同位素地球化学国家重点实验室,广东广州510640 [2]北京大学核物理与核技术国家重点实验室,北京100871 [3]香港大学地球科学学院,香港999077

出　　处：《地球化学》2013年第4期297-306,共10页Geochimica

基　　金：国家自然科学基金(40231015;40473002);国家重点基础研究发展计划(2005CB422004);中国科学院知识创新工程项目(KSCX2-SW-133)

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。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/m^3 to 460 mL/m^3, with the monthly mean concentration fluctuating between 530 mL/m^3 and 470 mL/m^3. 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 A14C 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 A14C values vary between 4.9‰ and -41.7‰. The higher △^14C values mainly appear in summer and autumn （July to September）, and the mean value is about -5.2‰, while, the lower △^14C values mainly appear in spring （December to April next year） and winter, with an average value of about -27.1‰. According to the △^14C values, fossil fuel-derived CO2 concentrations are calculated ranges from 1 mL/m^3 to 58 mL/m^3, with the annual mean concentration of about 24 mL/m^3. Correspondingly, the lower fossil fuel-derived CO2 concentrations appear in summer and autumn （July to September） and the mean value is about 17 mL/m^3, 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/m^3. 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.

关 键 词：城市大气CO2浓度 Δ14C 化石源CO2浓度 季节变化 人类活动 广州 

分 类 号：P593[天文地球—地球化学] P421.2[天文地球—地质学]