Observations of VOC emissions and photochemical products over US oil- and gas-producing regions using high-resolution H3O+ CIMS (PTR-ToF-MS)

Koss, A.; Yuan, B.; Warneke, C.; Gilman, J. B.; Lerner, B. M.; Veres, P. R.; Peischl, J.; Eilerman, S.; Wild, R.; Brown, S. S.; Thompson, C. R.; Ryerson, T.; Hanisco, T.; Wolfe, G. M.; Clair, J. M. S.; Thayer, M.; Keutsch, F. N.; Murphy, S.; de Gouw, J.

doi:10.5194/amt-10-2941-2017

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Observations of VOC emissions and photochemical products over US oil- and gas-producing regions using high-resolution H3O+ CIMS (PTR-ToF-MS)

Details:

Personal Author:

Koss, A. ; Yuan, B. ; Warneke, C. ; Gilman, J. B. ; Lerner, B. M. ; ... More ▼

NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; CSL (Chemical Sciences Laboratory) ;

Description:

VOCs related to oil and gas extraction operations in the United States were measured by H3O+ chemical ionization time-of-flight mass spectrometry (H3O+ ToFCIMS/PTR-ToF-MS) from aircraft during the Shale Oil and Natural Gas Nexus (SONGNEX) campaign in March-April 2015. This work presents an overview of major VOC species measured in nine oil-and gas-producing regions, and a more detailed analysis of H3O+ ToF-CIMS measurements in the Permian Basin within Texas and New Mexico. Mass spectra are dominated by small photochemically produced oxygenates and compounds typically found in crude oil: aromatics, cyclic alkanes, and alkanes. Mixing ratios of aromatics were frequently as high as those measured downwind of large urban areas. In the Permian, the H3O+ ToF-CIMS measured a number of underexplored or previously unreported species, including aromatic and cycloalkane oxidation products, nitrogen heterocycles including pyrrole (C4H5N) and pyrroline (C4H7N), H2S, and a diamondoid (adamantane) or unusual monoterpene. We additionally assess the specificity of a number of ion masses resulting from H3O+ ion chemistry previously reported in the literature, including several new or alternate interpretations.

DOI:

http://dx.doi.org/10.5194/amt-10-2941-2017

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Journal Article

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CC BY

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