Bannan, Thomas J., Murray Booth, A., Le Breton, Michael et al. (12 more authors) (2017) Seasonality of Formic Acid (HCOOH) in London during the ClearfLo Campaign. Journal of Geophysical Research: Biogeosciences. ISSN 2169-8961
Abstract
Following measurements in the winter of 2012, formic acid (HCOOH) and nitric acid (HNO3) were measured using a chemical ionization mass spectrometer (CIMS) during the Summer Clean Air for London (ClearfLo) campaign in London, 2012. Consequently, the seasonal dependence of formic acid sources could be better understood. A mean formic acid concentration of 1.3 ppb and a maximum of 12.7 ppb was measured which is significantly greater than that measured during the winter campaign (0.63 ppb and 6.7 ppb, respectively). Daily calibrations of formic acid during the summer campaign gave sensitivities of 1.2 ion counts s-1 parts per trillion (ppt) by volume-1 and a limit of detection of 34 ppt. During the summer campaign, there was no correlation between formic acid and anthropogenic emissions such as NOx and CO or peaks associated with the rush hour as was identified in the winter. Rather, peaks in formic acid were observed that correlated with solar irradiance. Analysis using a photochemical trajectory model has been conducted to determine the source of this formic acid. The contribution of formic acid formation through ozonolysis of alkenes is important but the secondary production from biogenic VOCs could be the most dominant source of formic acid at this measurement site during the summer.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017, The Authors |
Keywords: | Air quality,Chemical ionization mass spectrometry,Clean Air for London,Criegee intermediate,Formic acid,Ozonolysis |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Chemistry (York) |
Funding Information: | Funder Grant number NATURAL ENVIRONMENT RESEARCH COUNCIL NE/H003223/1 |
Depositing User: | Pure (York) |
Date Deposited: | 08 Dec 2017 12:10 |
Last Modified: | 16 Oct 2024 14:15 |
Published Version: | https://doi.org/10.1002/2017JD027064 |
Status: | Published online |
Refereed: | Yes |
Identification Number: | 10.1002/2017JD027064 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:125048 |
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Filename: Bannan_et_al_2017_Journal_of_Geophysical_Research_Atmospheres.pdf
Description: Seasonality of Formic Acid (HCOOH) in Londonduring the ClearfLo Campaign
Licence: CC-BY 2.5