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A combination of in situ, ground-based observations of marine boundary layer OH concentrations performed by laser-induced fluorescence at Mace Head, Ireland and Cape Grim, Tasmania, and a global chemistry-transport model (GEOS-CHEM) are used to obtain an estimate of the mean concentration of OH in the global troposphere. The model OH field is constrained to(More)
The organic content of shale has become of commercial interest as a source of hydrocarbons, owing to the development of hydraulic fracturing ("fracking"). While the main focus is on the extraction of methane, shale also contains significant amounts of non-methane hydrocarbons (NMHCs). We describe the first real-time observations of the release of NMHCs from(More)
Halogens (Cl, Br) have a profound influence on stratospheric ozone (O3). They (Cl, Br and I) have recently also been shown to impact the troposphere, notably by reducing the mixing ratios of O3 and OH. Their potential for impacting regional air-quality is less well understood. We explore the impact of halogens on regional pollutants (focussing on O3) with(More)
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