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- W2019978596 abstract "The Department of Energy (DOE) G‐1 research aircraft made flights on 13 days during the month long Texas 2000 Air Quality Study (TexAQS 2000) to understand the sources and formation mechanism of the very high concentration O 3 plumes that are frequently observed in the Houston metropolitan area during the late summer. On six of those days the aircraft sampled plumes exhibiting O 3 concentrations in excess of 150 ppbv at a number of different locations in and around the greater Houston area. The composition of these plumes differed significantly from those typically observed in other urban areas, exhibiting unusually high concentrations of hydrocarbon oxidation products such as HCHO and photochemical product species such as peroxides. Estimates of the integrated formation efficiency of O 3 with respect to NO x , OPEx, indicate that O 3 had been formed in these high concentration plumes with efficiencies ranging between 6.4 and 11 ppbv O 3 per ppbv of NO x consumed. Without exception, back trajectories from the locations where these high O 3 plumes were observed passed over, or in close proximity to, sources of NO x and hydrocarbons surrounding the Houston Ship Channel. Calculations of instantaneous ozone formation rates and efficiencies using a box model constrained by measurements of stable species showed that ozone formation over and around the Houston Ship Channel could be very rapid (instantaneous rates up to 140 ppbv/h) and very efficient (OPEx up to 28) and, in some instances, limited by the availability of NO x . High concentrations of reactive hydrocarbons and NO x emitted by industries in this area appeared to be the cause of these high rates and efficiencies. Examination of the distribution of photochemical product distributions in the high O 3 plumes arising from Ship Channel emissions suggests that O 3 formation in these plumes was much more NO x limited than in typical urban plumes at equivalent times in their evolution. However, chemical/transport model simulations with realistic emissions inventories are needed to resolve the question of whether a NO x ‐ or hydrocarbon‐based control strategy would be most effective at controlling greater Houston O 3 concentrations." @default.
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- W2019978596 date "2004-09-14" @default.
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- W2019978596 title "Origin and properties of plumes of high ozone observed during the Texas 2000 Air Quality Study (TexAQS 2000)" @default.
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- W2019978596 doi "https://doi.org/10.1029/2003jd004311" @default.
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