Observations of total alkyl nitrates within the Sacramento Urban Plume
Item
Title (Dublin Core)
Observations of total alkyl nitrates within the Sacramento Urban Plume
Description (Dublin Core)
During the summer of 2001, NO<sub>2</sub>, total peroxy nitrates (ΣPNs), total alkyl nitrates (ΣANs), HNO<sub>3</sub>, volatile organic compounds (VOC), CO<sub>2</sub>, O<sub>3</sub>, and meteorological variables were measured at Granite Bay, CA. The diurnal variation in ΣPNs, ΣANs and HNO<sub>3</sub> were all strongly correlated with sunlight, indicating both that they are photochemically produced and that they have a lifetime of a few hours at this site. The mixing ratios of ΣANs ranged as high as 2 ppbv. Mixing ratios at night averaged 0.4 ppbv. Odd-oxygen (O<sub>x</sub>=O<sub>3</sub>+NO<sub>2</sub>) and ΣANs were strongly correlated reflecting both the common chemical source terms and the similar lifetimes of both species. Several approaches to interpreting the simultaneous variations of O<sub>x</sub> and ΣANs are described, and used to derive a best estimate of the ΣAN yield from the VOC mixture at this site of 4.2% and an estimate of the range that is consistent with the observations of 3.9–5.8%. A yield of 4.2% implies termination of the HO<sub>x</sub> catalytic cycle by ΣAN formation once every 24 cycles. Analysis of the HNO<sub>3</sub> observations in combination with the ΣAN and O<sub>3</sub> measurements suggests that NO<sub>x</sub> terminations limit the HO<sub>x</sub> chain length to between 4.7 and 6.3.
Creator (Dublin Core)
Cleary, P. A.
Murphy, J. G.
Wooldridge, P. J.
Day, D. A.
Millet, D. B.
McKay, M.
Goldstein, A. H.
Cohen, R. C.
Date (Dublin Core)
2018-08-10
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acpd-5-4801-2005
https://acp.copernicus.org/preprints/acpd-2005-0112/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
