Institute of Biometeorology (IBIMET - CNR), Via G.Caproni 8, 50145 Firenze, Italy.
Environ Pollut. 2012 May;164:125-31. doi: 10.1016/j.envpol.2012.01.019. Epub 2012 Feb 21.
Long-term fluxes of CO(2), and combined short-term fluxes of CH(4) and CO(2) were measured with the eddy covariance technique in the city centre of Florence. CO(2) long-term weekly fluxes exhibit a high seasonality, ranging from 39 to 172% of the mean annual value in summer and winter respectively, while CH(4) fluxes are relevant and don't exhibit temporal variability. Contribution of road traffic and domestic heating has been estimated through multi-regression models combined with inventorial traffic and CH(4) consumption data, revealing that heating accounts for more than 80% of observed CO(2) fluxes. Those two components are instead responsible for only 14% of observed CH(4) fluxes, while the major residual part is likely dominated by gas network leakages. CH(4) fluxes expressed as CO(2) equivalent represent about 8% of CO(2) emissions, ranging from 16% in summer to 4% in winter, and cannot therefore be neglected when assessing greenhouse impact of cities.
采用涡度相关技术在佛罗伦萨市中心测量了 CO(2) 的长期通量以及 CH(4) 和 CO(2) 的短期综合通量。CO(2) 的长期每周通量表现出很强的季节性，夏季和冬季分别为年平均水平的 39%至 172%，而 CH(4)通量则相关且没有时间变化。通过结合清单交通和 CH(4)消耗数据的多元回归模型来估计道路交通和家庭取暖的贡献，结果表明取暖占观测到的 CO(2)通量的 80%以上。这两个组成部分仅占观测到的 CH(4)通量的 14%，而主要的剩余部分可能由燃气网络泄漏主导。以 CO(2)当量表示的 CH(4)通量约占 CO(2)排放的 8%，范围从夏季的 16%到冬季的 4%，因此在评估城市的温室气体影响时不能忽略。
