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- W2000277957 abstract "Volatile organic compound (VOC) emissions in the 2007 CAPSS (Clean Air Protection Supporting System) emissions inventory are chemically speciated for the SAPRC99 (Statewide Air Pollution Research Center 99) mechanism, following the Source Classification Code (SCC) matching method to borrow the U.S.EPA's chemical speciation profiles. CMAQ simulations with High-order Direct Decoupled Method (HDDM) are in turn applied to evaluate uncertainty in the method by comparing the simulated model VOC species to the observations in the Seoul Metropolitan Area (SMA) for a 2007 June episode. Simulations under-predicted ALK1 to ALK4 in SAPRC99 by a factor of 2 to 5 and over-predicted ALK5 by a factor of 7.5 while ARO1, ARO2, OLE1, and ethylene (ETH) are comparable to the observations, showing relative difference by 10 to 30%. OLE2 emissions are roughly 4 times overestimated. Emission rates for individual VOC model species are revised referring to the ratio of simulated to observed concentrations. Impact of the VOC emission changes on the overall ozone prediction was insignificant for the days of which 1-hr maximum ozone are lower than 100 ppb. However, simulations showed ozone difference by 5 to 10 ppb when high ozone above 120 ppb was observed in the vicinity of Seoul. This result suggests that evaluations on individual model VOC emissions be necessary to lead ozone control plans to the right direction. Moreover, the simulated ratios of ARO1 and ARO2 to <TEX>$NO_x$</TEX> are roughly 50% lower than the observed ones, which imply that adjustment in <TEX>$NO_x$</TEX> and VOC emission rates may be required to mimic the real VOC/<TEX>$NO_x$</TEX> condition over the area." @default.
- W2000277957 created "2016-06-24" @default.
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- W2000277957 date "2011-10-31" @default.
- W2000277957 modified "2023-09-26" @default.
- W2000277957 title "Ozone Simulations over the Seoul Metropolitan Area for a 2007 June Episode, Part I: Evaluating Volatile Organic Compounds Emissions Speciated for the SAPRC99 Chemical Mechanism" @default.
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- W2000277957 doi "https://doi.org/10.5572/kosae.2011.27.5.580" @default.
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