Carbon monoxide isotopic measurements in Indianapolis constrain urban source isotopic signatures and support mobile fossil fuel emissions as the dominant wintertime CO source

Isaac J. Vimont, Jocelyn C. Turnbull, Vasilii V. Petrenko, Philip F. Place, Anna Karion, Natasha L. Miles, Scott J. Richardson, Kevin Gurney, Risa Patarasuk, Colm Sweeney, Bruce Vaughn, James W.C. White

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We present measurements of CO mole fraction and CO stable isotopes (δ 13 CO and δC 18 O) in air during the winters of 2013–14 and 2014–15 at tall tower sampling sites in and around Indianapolis, USA. A tower located upwind of the city was used to quantitatively remove the background CO signal, allowing for the first unambiguous isotopic characterization of the urban CO source and yielding 13 CO of –27.7 ± 0.5 VPDB and C 18 O of 17.7 ± 1.1 VSMOW for this source. We use the tower isotope measurements, results from a limited traffic study, as well as atmospheric reaction rates to examine contributions from different sources to the Indianapolis CO budget. Our results are consistent with earlier findings that traffic emissions are the dominant source, suggesting a contribution of 96% or more to the overall Indianapolis wintertime CO emissions. Our results are also consistent with the hypothesis that emissions from a small fraction of vehicles without functional catalytic systems dominate the Indianapolis CO budget.

Original languageEnglish (US)
Article number63
JournalElementa
Volume5
DOIs
StatePublished - Jan 1 2017
Externally publishedYes

Fingerprint

Fossil fuels
carbon monoxide
Carbon monoxide
Towers
fossil fuel
Isotopes
traffic emission
reaction rate
stable isotope
isotope
Reaction rates
winter
sampling
air
Sampling
Air
budget
traffic
city
vehicle

Keywords

  • Carbon Monoxide
  • Isotopes
  • Urban

ASJC Scopus subject areas

  • Oceanography
  • Environmental Engineering
  • Ecology
  • Geotechnical Engineering and Engineering Geology
  • Geology
  • Atmospheric Science

Cite this

Carbon monoxide isotopic measurements in Indianapolis constrain urban source isotopic signatures and support mobile fossil fuel emissions as the dominant wintertime CO source. / Vimont, Isaac J.; Turnbull, Jocelyn C.; Petrenko, Vasilii V.; Place, Philip F.; Karion, Anna; Miles, Natasha L.; Richardson, Scott J.; Gurney, Kevin; Patarasuk, Risa; Sweeney, Colm; Vaughn, Bruce; White, James W.C.

In: Elementa, Vol. 5, 63, 01.01.2017.

Research output: Contribution to journalArticle

Vimont, IJ, Turnbull, JC, Petrenko, VV, Place, PF, Karion, A, Miles, NL, Richardson, SJ, Gurney, K, Patarasuk, R, Sweeney, C, Vaughn, B & White, JWC 2017, 'Carbon monoxide isotopic measurements in Indianapolis constrain urban source isotopic signatures and support mobile fossil fuel emissions as the dominant wintertime CO source', Elementa, vol. 5, 63. https://doi.org/10.1525/elementa.136
Vimont, Isaac J. ; Turnbull, Jocelyn C. ; Petrenko, Vasilii V. ; Place, Philip F. ; Karion, Anna ; Miles, Natasha L. ; Richardson, Scott J. ; Gurney, Kevin ; Patarasuk, Risa ; Sweeney, Colm ; Vaughn, Bruce ; White, James W.C. / Carbon monoxide isotopic measurements in Indianapolis constrain urban source isotopic signatures and support mobile fossil fuel emissions as the dominant wintertime CO source. In: Elementa. 2017 ; Vol. 5.
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