临安区域大气本底站CO_2浓度特征及其碳源汇变化研究

Characteristics of Atmospheric CO_2 Concentration and Variation of Carbon Source & Sink at Lin'an Regional Background Station

通过分析2006年8月～2009年7月临安区域大气本底站Flask瓶采样获得的CO2浓度特征,结合碳追踪模式的模拟结果,研究了长三角地区碳源汇变化对CO2浓度的影响.结果表明,临安区域大气本底站的CO2浓度分布在368.3×10-6～414.8×10-6之间,具有较明显的季节波动变化特征,冬季高、夏季低,浓度年较差接近20.5×10-6;CO2浓度平均增幅达3.2×10-6/a,增速较快.长三角地区CO2通量分布主要与化石燃料燃烧、生物圈的吸收/排放、海洋吸收/排放有关,生物质燃烧对碳通量的贡献较小.化石燃料燃烧是该地区重要的碳源,生物圈和海洋是重要的碳汇.临安区域大气本底站CO2浓度的季节变化趋势与长三角地区化石燃料燃烧和生物圈吸收/排放的碳通量变化较为一致.

Characteristics of Atmospheric CO2 concentration obtained by Flask measurements were analyzed at Lin＇an regional background station from August 2006 to July 2009.According to the simulation results of carbon tracking model,the impact of carbon sources and sinks on CO2 concentration was evaluated in Yangtze River Delta.The results revealed that atmospheric CO2 concentrations at Lin＇an regional background station were between 368.3×10-6 and 414.8×10-6.The CO2 concentration varied as seasons change,with maximum in winter and minimum in summer;the annual difference was about 20.5×10-6.The long-term trend of CO2 concentration showed rapid growth year by year;the average growth rate was about 3.2×10-6/a.CO2 flux of Yangtze River Delta was mainly contributed by fossil fuel burning,terrestrial biosphere exchange and ocean exchange,while the contribution of fire emission was small.CO2 flux from fossil fuel burning played an important role in carbon source;terrestrial biosphere and ocean were important carbon sinks in this area.Seasonal variations of CO2 concentration at Lin＇an regional background station were consistent with CO2 fluxes from fossil fuel burning and terrestrial biosphere exchange.