Alkyl nitrate measurements during STERAO 1996 and NARE 1997: Intercomparison and survey of results

Craig A. Stroud, James M. Roberts, Jonathan Williams, Paul D. Goldan, William C. Kuster, Thomas B. Ryerson, Donna Sueper, David D. Parrish, Michael Trainer, Frederick C. Fehsenfeld, Frank Flocke, Sue M. Schauffler, Verity R F Stroud, Elliot L Atlas

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Alkyl nitrates were measured over the northeastern plains of Colorado during the Stratospheric Tropospheric Exchange: Radiation, Aerosols and Ozone (STERAO) 1996 campaign and over the North Atlantic during the North Atlantic Regional Experiment (NARE) 1997. Alkyl nitrate measurements were performed by two different laboratories enabling an intercomparison of analytical techniques. A weighted bivariate linear regression analysis of comparable samples (National Oceanic and Atmospheric Administration versus National Center for Atmospheric Research) for the four alkyl nitrates measured by both techniques (2-propyl nitrate, 1-propyl nitrate, 2-butyl nitrate, and 3-pentyl nitrate) suggests there is neither a significant calibration difference nor a systematic offset. The precision of the measurements is indicated by the scatter in the correlations. Good precision is observed for the 2-butyl nitrate measurements (square of the correlation coefficient, R2=0.90). However, relatively small values of R2 and relatively large uncertainties in the determination of the slopes and intercepts (2σ confidence intervals) for 2-propyl nitrate, 1-propyl nitrate, and 3-pentyl nitrate suggest significant imprecision when compared to ambient mixing ratios for at least one of the measurement techniques. Vertical profiles during NARE 1997 show high levels of alkyl nitrates in well-defined photochemical pollution layers of continental origin. A comparison of alkyl nitrate to hydrocarbon ratios with a sequential reaction scheme model suggests our understanding of C4-C5 alkyl nitrate photochemistry is adequate to reproduce the observations. Air masses with larger ratios of alkyl nitrate to hydrocarbons were observed during NARE 1997 than STERAO 1996, consistent with the NARE 1997 measurements being in the more remote North Atlantic. These results suggest that information related to the photochemical age of an air mass can be derived from alkyl nitrate to hydrocarbon ratios.

Original languageEnglish (US)
Article number2000JD000003
Pages (from-to)23043-23053
Number of pages11
JournalJournal of Geophysical Research C: Oceans
Volume106
Issue numberD19
StatePublished - Oct 16 2001
Externally publishedYes

Fingerprint

Upper atmosphere
Ozone
Aerosols
Nitrates
ozone
nitrates
aerosols
aerosol
nitrate
Radiation
propyl nitrate
radiation
experiment
Experiments
Hydrocarbons
hydrocarbons
air masses
hydrocarbon
air mass
Photochemical reactions

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

Stroud, C. A., Roberts, J. M., Williams, J., Goldan, P. D., Kuster, W. C., Ryerson, T. B., ... Atlas, E. L. (2001). Alkyl nitrate measurements during STERAO 1996 and NARE 1997: Intercomparison and survey of results. Journal of Geophysical Research C: Oceans, 106(D19), 23043-23053. [2000JD000003].

Alkyl nitrate measurements during STERAO 1996 and NARE 1997 : Intercomparison and survey of results. / Stroud, Craig A.; Roberts, James M.; Williams, Jonathan; Goldan, Paul D.; Kuster, William C.; Ryerson, Thomas B.; Sueper, Donna; Parrish, David D.; Trainer, Michael; Fehsenfeld, Frederick C.; Flocke, Frank; Schauffler, Sue M.; Stroud, Verity R F; Atlas, Elliot L.

In: Journal of Geophysical Research C: Oceans, Vol. 106, No. D19, 2000JD000003, 16.10.2001, p. 23043-23053.

Research output: Contribution to journalArticle

Stroud, CA, Roberts, JM, Williams, J, Goldan, PD, Kuster, WC, Ryerson, TB, Sueper, D, Parrish, DD, Trainer, M, Fehsenfeld, FC, Flocke, F, Schauffler, SM, Stroud, VRF & Atlas, EL 2001, 'Alkyl nitrate measurements during STERAO 1996 and NARE 1997: Intercomparison and survey of results', Journal of Geophysical Research C: Oceans, vol. 106, no. D19, 2000JD000003, pp. 23043-23053.
Stroud CA, Roberts JM, Williams J, Goldan PD, Kuster WC, Ryerson TB et al. Alkyl nitrate measurements during STERAO 1996 and NARE 1997: Intercomparison and survey of results. Journal of Geophysical Research C: Oceans. 2001 Oct 16;106(D19):23043-23053. 2000JD000003.
Stroud, Craig A. ; Roberts, James M. ; Williams, Jonathan ; Goldan, Paul D. ; Kuster, William C. ; Ryerson, Thomas B. ; Sueper, Donna ; Parrish, David D. ; Trainer, Michael ; Fehsenfeld, Frederick C. ; Flocke, Frank ; Schauffler, Sue M. ; Stroud, Verity R F ; Atlas, Elliot L. / Alkyl nitrate measurements during STERAO 1996 and NARE 1997 : Intercomparison and survey of results. In: Journal of Geophysical Research C: Oceans. 2001 ; Vol. 106, No. D19. pp. 23043-23053.
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abstract = "Alkyl nitrates were measured over the northeastern plains of Colorado during the Stratospheric Tropospheric Exchange: Radiation, Aerosols and Ozone (STERAO) 1996 campaign and over the North Atlantic during the North Atlantic Regional Experiment (NARE) 1997. Alkyl nitrate measurements were performed by two different laboratories enabling an intercomparison of analytical techniques. A weighted bivariate linear regression analysis of comparable samples (National Oceanic and Atmospheric Administration versus National Center for Atmospheric Research) for the four alkyl nitrates measured by both techniques (2-propyl nitrate, 1-propyl nitrate, 2-butyl nitrate, and 3-pentyl nitrate) suggests there is neither a significant calibration difference nor a systematic offset. The precision of the measurements is indicated by the scatter in the correlations. Good precision is observed for the 2-butyl nitrate measurements (square of the correlation coefficient, R2=0.90). However, relatively small values of R2 and relatively large uncertainties in the determination of the slopes and intercepts (2σ confidence intervals) for 2-propyl nitrate, 1-propyl nitrate, and 3-pentyl nitrate suggest significant imprecision when compared to ambient mixing ratios for at least one of the measurement techniques. Vertical profiles during NARE 1997 show high levels of alkyl nitrates in well-defined photochemical pollution layers of continental origin. A comparison of alkyl nitrate to hydrocarbon ratios with a sequential reaction scheme model suggests our understanding of C4-C5 alkyl nitrate photochemistry is adequate to reproduce the observations. Air masses with larger ratios of alkyl nitrate to hydrocarbons were observed during NARE 1997 than STERAO 1996, consistent with the NARE 1997 measurements being in the more remote North Atlantic. These results suggest that information related to the photochemical age of an air mass can be derived from alkyl nitrate to hydrocarbon ratios.",
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AU - Ryerson, Thomas B.

AU - Sueper, Donna

AU - Parrish, David D.

AU - Trainer, Michael

AU - Fehsenfeld, Frederick C.

AU - Flocke, Frank

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