Gerosa Giacomo, Ferretti Marco, Bussotti Filippo, Rocchini Duccio
Dipartimento di Biologia Vegetale, Università di Firenze, Piazzale Cascine 28, I-50144 Firenze, Italy.
Environ Pollut. 2007 Feb;145(3):629-35. doi: 10.1016/j.envpol.2006.02.030. Epub 2006 May 8.
Weekly-fortnightly ozone (O3) concentrations measured by passive sampling at 81 forest monitoring plots in France, Italy, Spain and Switzerland over the period 2000-2002 were used to estimate the cumulative exposure index AOT40. The estimation method is based on a deterministic model which describes the O3 daily profile as a function of relative altitude (the difference between the altitude of the site and the lowest altitude within a 5 km radius) and the time of the day. Estimated AOT40 values (AOT40(e)) were evaluated against co-located automatic measurement stations and with 14 independent automatic stations located throughout Italy whose weekly mean O3 values were used to simulate passive samplers. AOT40 can be predicted by modelling passive sampling data (R2: 0.90; P<0.0001, SE of estimates: 3271 ppb h), although considerable deviations can occur for individual sites. Estimated AOT40 shows a distinct, significant latitudinal and altitudinal gradient. Taking the 3-year average as a whole, exceedance of critical level of 5000 ppb h occurs at 77-100% of the monitored sites, respectively.
2000 - 2002年期间，通过被动采样法在法国、意大利、西班牙和瑞士的81个森林监测地块测量的每周至每两周的臭氧（O₃）浓度，用于估算累积暴露指数AOT40。估算方法基于一个确定性模型，该模型将臭氧日分布描述为相对海拔（站点海拔与5公里半径内最低海拔之差）和一天中时间的函数。将估算的AOT40值（AOT40(e)）与同地的自动测量站以及意大利各地的14个独立自动站进行评估，这些自动站的每周平均臭氧值用于模拟被动采样器。通过对被动采样数据建模可以预测AOT40（R²：0.90；P<0.0001，估算标准误差：3271 ppb·h），尽管个别站点可能会出现较大偏差。估算的AOT40呈现出明显的、显著的纬度和海拔梯度。从整体三年平均值来看，分别有77 - 100%的监测站点超过了5000 ppb·h的临界水平。
