Effects of mixing on evolution of hydrocarbon ratios in the troposphere

David D. Parrish, A. Stohl, C. Forster, Elliot L Atlas, D. R. Blake, P. D. Goldan, W. C. Kuster, J. A. de Gouw

Research output: Contribution to journalArticle

93 Citations (Scopus)

Abstract

Nonmethane hydrocarbon (NMHC) concentration ratios provide useful indicators of tropospheric oxidation and transport processes. However, the influences of both photochemical and mixing processes are inextricably linked in the evolution of these ratios. We present a model for investigating these influences by combining the transport treatment of the Lagrangian particle dispersion model FLEXPART with an ultrasimple (i.e., constant OH concentration) chemical treatment. Required model input includes NMHC emission ratios, but not ad hoc assumed background NMHC concentrations. The model results give NMHC relationships that can be directly compared, in a statistical manner, with measurements. The measured concentration ratios of the longest-lived alkanes show strong deviations from purely kinetic behavior, which the model nicely reproduces. In contrast, some measured aromatic ratio relationships show even stronger deviations that are not well reproduced by the model for reasons that are not understood. The model-measurement comparisons indicate that the interaction of mixing and photochemical processing prevent a simple interpretation of "photochemical age," but that the average age of any particular NMHC can be well defined and can be approximated by a properly chosen and interpreted NMHC ratio. In summary, the relationships of NMHC concentration ratios not only yield useful measures of photochemical processing in the troposphere, but also provide useful test of the treatment of mixing and chemical processing in chemical transport models.

Original languageEnglish (US)
Article numberD10S34
JournalJournal of Geophysical Research C: Oceans
Volume112
Issue number10
DOIs
StatePublished - May 27 2007

Fingerprint

Troposphere
nonmethane hydrocarbon
Hydrocarbons
troposphere
hydrocarbons
hydrocarbon
Processing
deviation
Alkanes
effect
transport process
alkane
alkanes
oxidation
kinetics
Oxidation
Kinetics

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science
  • Astronomy and Astrophysics
  • Oceanography

Cite this

Parrish, D. D., Stohl, A., Forster, C., Atlas, E. L., Blake, D. R., Goldan, P. D., ... de Gouw, J. A. (2007). Effects of mixing on evolution of hydrocarbon ratios in the troposphere. Journal of Geophysical Research C: Oceans, 112(10), [D10S34]. https://doi.org/10.1029/2006JD007583

Effects of mixing on evolution of hydrocarbon ratios in the troposphere. / Parrish, David D.; Stohl, A.; Forster, C.; Atlas, Elliot L; Blake, D. R.; Goldan, P. D.; Kuster, W. C.; de Gouw, J. A.

In: Journal of Geophysical Research C: Oceans, Vol. 112, No. 10, D10S34, 27.05.2007.

Research output: Contribution to journalArticle

Parrish, DD, Stohl, A, Forster, C, Atlas, EL, Blake, DR, Goldan, PD, Kuster, WC & de Gouw, JA 2007, 'Effects of mixing on evolution of hydrocarbon ratios in the troposphere', Journal of Geophysical Research C: Oceans, vol. 112, no. 10, D10S34. https://doi.org/10.1029/2006JD007583
Parrish, David D. ; Stohl, A. ; Forster, C. ; Atlas, Elliot L ; Blake, D. R. ; Goldan, P. D. ; Kuster, W. C. ; de Gouw, J. A. / Effects of mixing on evolution of hydrocarbon ratios in the troposphere. In: Journal of Geophysical Research C: Oceans. 2007 ; Vol. 112, No. 10.
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