A flow-tube based laser-induced fluorescence instrument to measure OH reactivity in the troposphere
Open Access
- 31 August 2009
- journal article
- Published by Copernicus GmbH in Atmospheric Chemistry and Physics
- Vol. 2 (2), 465-477
- https://doi.org/10.5194/amt-2-465-2009
Abstract
A field instrument utilising the artificial generation of OH radicals in a sliding injector flow-tube reactor with detection by laser-induced fluorescence spectroscopy has been developed to measure the rate of decay of OH by reaction with its atmospheric sinks. The OH reactivity instrument has been calibrated using known concentrations of CO, NO2 and single hydrocarbons in a flow of zero air, and the impact of recycling of OH via the reaction HO2+NO→OH+NO2 on the measured OH reactivity has been quantified. As well as a detailed description of the apparatus, the capabilities of the new instrument are illustrated using representative results from deployment in the semi-polluted marine boundary layer at the Weybourne Atmospheric Observatory, UK, and in a tropical rainforest at the Bukit Atur Global Atmospheric Watch station, Danum Valley, Borneo.Keywords
This publication has 29 references indexed in Scilit:
- Free radical modelling studies during the UK TORCH Campaign in Summer 2003Atmospheric Chemistry and Physics, 2007
- Missing OH Reactivity in a Forest: Evidence for Unknown Reactive Biogenic VOCsScience, 2004
- Kinetics of the gas-phase reactions of OH radicals with alkanes and cycloalkanesAtmospheric Chemistry and Physics, 2003
- Measurement of OH and HO2 in the TroposphereChemical Reviews, 2003
- Atmospheric lifetime as a probe of radical chemistry in the boundary layerAtmospheric Environment, 2003
- Protocol for the development of the Master Chemical Mechanism, MCM v3 (Part B): tropospheric degradation of aromatic volatile organic compoundsAtmospheric Chemistry and Physics, 2003
- Application of a compact all solid-state laser system to the in situ detection of atmospheric OH, HO2, NO and IO by laser-induced fluorescenceJournal of Environmental Monitoring, 2002
- Total OH Loss Rate MeasurementJournal of Atmospheric Chemistry, 2001
- Modeling OH, HO2, and RO2 radicals in the marine boundary layer: 1. Model construction and comparison with field measurementsJournal of Geophysical Research: Atmospheres, 1999
- Direct measurement of the total reaction rate of OH in the atmosphereAnalusis, 1999