临安区域大气本底站CO_2浓度特征及其碳源汇变化研究

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...

Characteristics of Atmospheric CO2 Concentration and Variation of Carbon Source & Sink at Lin'an Regional Background Station

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.