Seasonal cycles in short-lived hydrocarbons in baseline air masses arriving at Mace Head, Ireland
Seasonal cycles in short-lived hydrocarbons in baseline air masses arriving at Mace Head, Ireland
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DOI：
10.1016/j.atmosenv.2012.08.023
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发表时间：
2012-12
影响因子：
5
通讯作者：
R. Derwent;P. Simmonds;S. O'Doherty;A. Grant;D. Young;M. Cooke;A. Manning;S. Utembe;M. Jenkin;D. Shallcross
中科院分区：
文献类型：
--
作者：
R. Derwent;P. Simmonds;S. O'Doherty;A. Grant;D. Young;M. Cooke;A. Manning;S. Utembe;M. Jenkin;D. Shallcross
在爱尔兰梅斯海德基线气团中观察到的一系列活性碳氢化合物的季节性周期与主要是人造源和羟基（OH）自由基氧化的简单图景一致。因此，物种对 OH 的反应越激烈，观察到的季节周期就越明显。对于戊烷来说，冬季去除量很少的假设不成立，导致相对于乙烷、丙烷和丁烷的季节性循环明显减弱。全球化学输运模型用于描述梅斯角碳氢化合物的季节性循环，并提供对其观测到的幅度和相位的准确描述。该模型推导出支持观测到的碳氢化合物季节性循环所需的基线气团中的局部 OH 浓度平均为 1.38 ± 1.1 × 106 分子 cm−3。夏季白天的峰值浓度达到 1.2 × 107 分子 cm−3。
The observed seasonal cycles of a selection of reactive hydrocarbons in baseline air masses at Mace Head, Ireland are consistent with a simple picture of largely man-made sources and oxidation by hydroxyl (OH) radicals. As a result, the observed seasonal cycles become more pronounced the more reactive the species are with OH. For the pentanes, the assumption of little wintertime removal breaks down, leading to an apparent dampening of the seasonal cycles relative to ethane, propane and the butanes. A global chemistry-transport model is used to describe the seasonal cycles of the hydrocarbons at Mace Head and provided an accurate description of their observed amplitudes and phases. The model derived local OH concentrations in baseline air masses required to support the observed seasonal cycles of the hydrocarbons averaged 1.38 ± 1.1 × 106molecule cm−3. Peak daytime levels during summertime reached 1.2 × 107molecule cm−3.