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Stone, D, Whalley, L, Ingham, T et al. (5 more authors) (2016) Measurement of OH reactivity by laser flash photolysis coupled with laser-induced fluorescence spectroscopy. Atmospheric Measurement Techniques, 9. pp. 2827-2844. ISSN 1867-1381
Abstract
OH reactivity (k’OH) is the total pseudo-first-order loss rate coefficient describing the removal of OH radicals to all sinks in the atmosphere, and is the inverse of the chemical lifetime of OH. Measurements of ambient OH reactivity can be used to discover the extent to which measured OH sinks contribute to the total OH loss rate. Thus, OH reactivity measurements enable determination of the comprehensiveness of measurements used in models to predict air quality and ozone production, and, in conjunction with measurements of OH radical concentrations, to assess our understanding of OH production rates. In this work, we describe the design and characterisation of an instrument to measure OH reactivity using laser flash photolysis coupled to laser-induced fluorescence (LFP-LIF) spectroscopy. The LFP-LIF technique produces OH radicals in isolation, and thus minimises potential interferences in OH reactivity measurements owing to the reaction of HO2 with NO which can occur if HO2 is co-produced with OH in the instrument. Capabilities of the instrument for ambient OH reactivity measurements are illustrated by data collected during field campaigns in London, UK, and York, UK. The instrumental limit of detection for k’OH was determined to be 1.0 s-1 for the campaign in London and 0.4 s-1 for the campaign in York. The precision, determined by laboratory experiment, is typically < 1 s-1 for most ambient measurements of OH reactivity. Total uncertainty in ambient measurements of OH reactivity is ~6 %. We also present the coupling and characterisation of the LFP-LIF instrument to an atmospheric chamber for measurements of OH reactivity during simulated experiments, and provide suggestions for future improvements to OH reactivity LFP-LIF instruments.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © Author(s) 2016. Reproduced in accordance with the publisher's self-archiving policy. This work is distributed under the Creative Commons Attribution 3.0 License |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemistry (Leeds) > Physical Chemistry (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 14 Jul 2016 14:56 |
Last Modified: | 17 Dec 2019 15:07 |
Published Version: | http://dx.doi.org/10.5194/amt-9-2827-2016 |
Status: | Published |
Publisher: | European Geosciences Union |
Identification Number: | 10.5194/amt-9-2827-2016 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:102276 |
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Measurement of OH reactivity by laser flash photolysis coupled with laser-induced fluorescence spectroscopy. (deposited 17 Dec 2019 15:05)
- Measurement of OH reactivity by laser flash photolysis coupled with laser-induced fluorescence spectroscopy. (deposited 14 Jul 2016 14:56) [Currently Displayed]