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Photochemical ozone production in the eastern Mediterranean

机译：地中海东部的光化学臭氧生产

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A 7 year time series (1997-2004) of surface ozone at Finokalia, Crete, in the Eastern Mediterranean, was analysed to investigate the factors that control the diurnal variability of ozone, and evaluate seasonally distributed ozone production/destruction rates in the area. The observed diurnal evolution of related chemical/physical parameters indicates that ozone morning built-up is driven by photochemistry while during summer the entrainment from the free troposphere is the dominant process in the afternoon. The observed similar behaviour of ozone maxima and Radon-222 minima supports that entrainment from the free troposphere affects the ozone diurnal pattern. Ozone nighttime depletion is mainly attributed to deposition and to a lesser extent to chemical reactions. On an annual basis the role of local photochemistry is found to be limited (-1-1.7 ppbv d(-1)) contributing by less than 4% to the observed ozone levels. During summer the enhanced ozone destruction via deposition and chemistry are almost balanced by the chemical production and the entrainment of ozone rich air masses from the free troposphere that maximizes in summer (4-6% of the observed ozone levels). Chemical box model simulations also indicate low net chemical production in the area throughout the year that results from high chemical production and destruction terms. Especially during summer photochemical ozone depletion over the area is revealed both by model results and observations (0.5-1.0 ppbv d(-1)). (c) 2006 Elsevier Ltd. All rights reserved.
机译：分析了地中海东部克里特岛Finokalia地表臭氧的7年时间序列（1997-2004），以调查控制臭氧日变化的因素，并评估该地区季节性分布的臭氧产生/破坏率。观测到的有关化学/物理参数的日变化表明，早晨的臭氧积累是由光化学驱动的，而在夏季，自由对流层的夹带是下午的主要过程。观测到的臭氧最大值和Radon-222最小值的相似行为支持自由对流层的夹带影响臭氧的昼夜模式。臭氧夜间耗竭主要归因于沉积，而在较小程度上归因于化学反应。每年发现局部光化学的作用受到限制（-1-1.7 ppbv d（-1）），对观测到的臭氧水平的贡献不到4％。在夏季，通过沉积和化学作用增强的臭氧破坏几乎与化学生产和来自自由对流层的夹带臭氧的富气团块的吸收达到平衡，这种情况在夏季达到最大（观测到的臭氧水平的4-6％）。化学箱模型模拟还表明，该地区全年的化学净产量较低，这是由于化学生产和销毁量较高而造成的。尤其是在夏季，通过模型结果和观测值（0.5-1.0 ppbv d（-1））都可以揭示该地区的光化学臭氧消耗。 （c）2006 Elsevier Ltd.保留所有权利。

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