Observation of isoprene hydroxynitrates in the southeastern United States and implications for the fate of NOx

Xiong, F.; McAvey, K. M.; Pratt, K. A.; Groff, C. J.; Hostetler, M. A.; Lipton, M. A.; Starn, T. K.; Seeley, J. V.; Bertman, S. B.; Teng, A. P.; Crounse, J. D.; Nguyen, T. B.; Wennberg, P. O.; Misztal, P. K.; Goldstein, A. H.; Guenther, A. B.; Koss, A. R.; Olson, K. F.; de Gouw, J. A.; Baumann, K.; Edgerton, E. S.; Feiner, P. A.; Zhang, L.; Miller, D. O.; Brune, W. H.; Shepson, P. B.

doi:10.5194/acp-15-11257-2015

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Observation of isoprene hydroxynitrates in the southeastern United States and implications for the fate of NOx

2015
By Xiong, F. ; McAvey, K. M. ; Pratt, K. A. ; ...
Source: Atmospheric Chemistry and Physics, 15(19), 11257-11272.

[PDF-698.09 KB]

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Journal Title:

Atmospheric Chemistry and Physics
Personal Author:

Xiong, F. ; McAvey, K. M. ; Pratt, K. A. ; Groff, C. J. ; Hostetler, M. A. ; ... More +

Xiong, F. ; McAvey, K. M. ; Pratt, K. A. ; Groff, C. J. ; Hostetler, M. A. ; Lipton, M. A. ; Starn, T. K. ; Seeley, J. V. ; Bertman, S. B. ; Teng, A. P. ; Crounse, J. D. ; Nguyen, T. B. ; Wennberg, P. O. ; Misztal, P. K. ; Goldstein, A. H. ; Guenther, A. B. ; Koss, A. R. ; Olson, K. F. ; de Gouw, J. A. ; Baumann, K. ; Edgerton, E. S. ; Feiner, P. A. ; Zhang, L. ; Miller, D. O. ; Brune, W. H. ; Shepson, P. B. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; CSD (Chemical Sciences Division)

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; CSD (Chemical Sciences Division) Less -
Description:

Isoprene hydroxynitrates (IN) are tracers of the photochemical oxidation of isoprene in high NOx environments. Production and loss of IN have a significant influence on the NOx cycle and tropospheric O-3 chemistry. To better understand IN chemistry, a series of photochemical reaction chamber experiments was conducted to determine the IN yield from isoprene photooxidation at high NO concentrations (>100 ppt). By combining experimental data and calculated isomer distributions, a total IN yield of 9(+4/-3)% was derived. The result was applied in a zero-dimensional model to simulate production and loss of ambient IN observed in a temperate forest atmosphere, during the Southern Oxidant and Aerosol Study (SOAS) field campaign, from 27 May to 11 July 2013. The 9% yield was consistent with the observed IN/(MVK+MACR) ratios observed during SOAS. By comparing field observations with model simulations, we identified NO as the limiting factor for ambient IN production during SOAS, but vertical mixing at dawn might also contribute (similar to 27 %) to IN dynamics. A close examination of isoprene's oxidation products indicates that its oxidation transitioned from a high-NO dominant chemical regime in the morning into a low-NO dominant regime in the afternoon. A significant amount of IN produced in the morning high NO regime could be oxidized in the low NO regime, and a possible reaction scheme was proposed.
Source:

Atmospheric Chemistry and Physics, 15(19), 11257-11272.
DOI:

https://doi.org/10.5194/acp-15-11257-2015
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Journal Article
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CC BY
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urn:sha256:d0644327506ded908951d2889d31ca2e0b9d373927ce7a1bc983b78372d34653
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Observation of isoprene hydroxynitrates in the southeastern United States and implications for the fate of NOx

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