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000943332 1001_ $$0P:(DE-HGF)0$$aRickly, Pamela S.$$b0$$eCorresponding author
000943332 245__ $$aInfluence of Wildfire on Urban Ozone: An Observationally Constrained Box Modeling Study at a Site in the Colorado Front Range
000943332 260__ $$aColumbus, Ohio$$bAmerican Chemical Society$$c2023
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000943332 520__ $$aIncreasing trends in biomass burning emissions significantly impact air quality in North America. Enhanced mixing ratios of ozone (O3) in urban areas during smoke-impacted periods occur through transport of O3 produced within the smoke or through mixing of pyrogenic volatile organic compounds (PVOCs) with urban nitrogen oxides (NOx = NO + NO2) to enhance local O3 production. Here, we analyze a set of detailed chemical measurements, including carbon monoxide (CO), NOx, and speciated volatile organic compounds (VOCs), to evaluate the effects of smoke transported from relatively local and long-range fires on O3 measured at a site in Boulder, Colorado, during summer 2020. Relative to the smoke-free period, CO, background O3, OH reactivity, and total VOCs increased during both the local and long-range smoke periods, but NOx mixing ratios remained approximately constant. These observations are consistent with transport of PVOCs (comprised primarily of oxygenates) but not NOx with the smoke and with the influence of O3 produced within the smoke upwind of the urban area. Box-model calculations show that local O3 production during all three periods was in the NOx-sensitive regime. Consequently, this locally produced O3 was similar in all three periods and was relatively insensitive to the increase in PVOCs. However, calculated NOx sensitivities show that PVOCs substantially increase O3 production in the transition and NOx-saturated (VOC-sensitive) regimes. These results suggest that (1) O3 produced during smoke transport is the main driver for O3 increases in NOx-sensitive urban areas and (2) smoke may cause an additional increase in local O3 production in NOx-saturated (VOC-sensitive) urban areas. Additional detailed VOC and NOx measurements in smoke impacted urban areas are necessary to broadly quantify the effects of wildfire smoke on urban O3 and develop effective mitigation strategies.
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000943332 7001_ $$00000-0002-5763-1925$$aCoggon, Matthew M.$$b1$$eCorresponding author
000943332 7001_ $$0P:(DE-HGF)0$$aAikin, Kenneth C.$$b2
000943332 7001_ $$0P:(DE-HGF)0$$aAlvarez, Raul J.$$b3
000943332 7001_ $$0P:(DE-HGF)0$$aBaidar, Sunil$$b4
000943332 7001_ $$00000-0002-7899-9948$$aGilman, Jessica B.$$b5
000943332 7001_ $$0P:(DE-Juel1)184937$$aGkatzelis, Georgios$$b6$$ufzj
000943332 7001_ $$00000-0001-5692-3427$$aHarkins, Colin$$b7
000943332 7001_ $$0P:(DE-HGF)0$$aHe, Jian$$b8
000943332 7001_ $$00000-0002-5131-7070$$aLamplugh, Aaron$$b9
000943332 7001_ $$0P:(DE-HGF)0$$aLangford, Andrew O.$$b10
000943332 7001_ $$00000-0001-8600-5096$$aMcDonald, Brian C.$$b11
000943332 7001_ $$00000-0002-9320-7101$$aPeischl, Jeff$$b12
000943332 7001_ $$0P:(DE-HGF)0$$aRobinson, Michael A.$$b13
000943332 7001_ $$0P:(DE-HGF)0$$aRollins, Andrew W.$$b14
000943332 7001_ $$00000-0002-7095-3718$$aSchwantes, Rebecca H.$$b15
000943332 7001_ $$0P:(DE-HGF)0$$aSenff, Christoph J.$$b16
000943332 7001_ $$00000-0003-3811-8496$$aWarneke, Carsten$$b17
000943332 7001_ $$00000-0001-7477-9078$$aBrown, Steven S.$$b18$$eCorresponding author
000943332 773__ $$0PERI:(DE-600)1465132-4$$a10.1021/acs.est.2c06157$$gp. acs.est.2c06157$$n3$$p1257–1267$$tEnvironmental science & technology$$v57$$x0013-936X$$y2023
000943332 8564_ $$uhttps://juser.fz-juelich.de/record/943332/files/Rickley%20et%20al%20Revised.docx$$yPublished on 2023-01-06. Available in OpenAccess from 2024-01-06.
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