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Title: Seasonality of Formic Acid (HCOOH) in London during the ClearfLo Campaign: Seasonality of Formic Acid in London

Following measurements in the winter of 2012, formic acid (HCOOH) and nitric acid (HNO 3) 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 NO x 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 sourcemore » of formic acid at this measurement site during the summer.« less
Authors:
ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [2] ;  [3] ; ORCiD logo [4] ;  [3] ;  [5] ;  [6] ; ORCiD logo [6] ; ORCiD logo [2] ;  [7]
  1. University of Manchester (United Kingdom). Centre for Atmospheric Science, School of Earth, Atmospheric and Environmental Science
  2. University of Bristol (United Kingdom). Biogeochemistry Research Centre, School of Chemistry
  3. University of York (United Kingdom). National Centre for Atmospheric Science and Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry
  4. University of York (United Kingdom). Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry
  5. University of Leicester (United Kingdom). National Centre for Atmospheric Science, Department of Chemistry
  6. Sandia National Lab. (SNL-CA), Livermore, CA (United States). Combustion Research Facility
  7. University of Manchester (United Kingdom). Centre for Atmospheric Science, School of Earth, Atmospheric and Environmental Science; California Inst. of Technology (CalTech), Pasadena, CA (United States)
Publication Date:
Report Number(s):
SAND-2017-13269J
Journal ID: ISSN 2169-897X; 659351; TRN: US1800702
Grant/Contract Number:
AC04-94AL85000; AC04-94-AL85000
Type:
Published Article
Journal Name:
Journal of Geophysical Research: Atmospheres
Additional Journal Information:
Journal Volume: 122; Journal Issue: 22; Journal ID: ISSN 2169-897X
Publisher:
American Geophysical Union
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES
OSTI Identifier:
1410365
Alternate Identifier(s):
OSTI ID: 1410366; OSTI ID: 1414437