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dc.date.accessioned2018-03-15T10:23:56Z
dc.date.available2018-03-15T10:23:56Z
dc.date.created2018-01-28T19:32:05Z
dc.date.issued2017
dc.identifier.citationBaier, Bianca C Brune, William H Miller, David O Blake, Donald Long, Russell Wisthaler, Armin Cantrell, Christopher Fried, Alan Heikes, Brian Brown, Steven McDuffie, Erin Flocke, Frank Apel, Eric Kaser, Lisa Weinheimer, Andrew . Higher measured than modeled ozone production at increased NOx levels in the Colorado Front Range. Atmospheric Chemistry and Physics. 2017, 17(18), 11273-11292
dc.identifier.urihttp://hdl.handle.net/10852/61012
dc.description.abstractChemical models must correctly calculate the ozone formation rate, P(O3), to accurately predict ozone levels and to test mitigation strategies. However, air quality models can have large uncertainties in P(O3) calculations, which can create uncertainties in ozone forecasts, especially during the summertime when P(O3) is high. One way to test mechanisms is to compare modeled P(O3) to direct measurements. During summer 2014, the Measurement of Ozone Production Sensor (MOPS) directly measured net P(O3) in Golden, CO, approximately 25 km west of Denver along the Colorado Front Range. Net P(O3) was compared to rates calculated by a photochemical box model that was constrained by measurements of other chemical species and that used a lumped chemical mechanism and a more explicit one. Median observed P(O3) was up to a factor of 2 higher than that modeled during early morning hours when nitric oxide (NO) levels were high and was similar to modeled P(O3) for the rest of the day. While all interferences and offsets in this new method are not fully understood, simulations of these possible uncertainties cannot explain the observed P(O3) behavior. Modeled and measured P(O3) and peroxy radical (HO2 and RO2) discrepancies observed here are similar to those presented in prior studies. While a missing atmospheric organic peroxy radical source from volatile organic compounds co-emitted with NO could be one plausible solution to the P(O3) discrepancy, such a source has not been identified and does not fully explain the peroxy radical model–data mismatch. If the MOPS accurately depicts atmospheric P(O3), then these results would imply that P(O3) in Golden, CO, would be NOx-sensitive for more of the day than what is calculated by models, extending the NOx-sensitive P(O3) regime from the afternoon further into the morning. These results could affect ozone reduction strategies for the region surrounding Golden and possibly other areas that do not comply with national ozone regulations. Thus, it is important to continue the development of this direct ozone measurement technique to understand P(O3), especially under high-NOx regimes.en_US
dc.languageEN
dc.language.isoenen_US
dc.publisherCopernicus
dc.rightsAttribution 3.0 Unported
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/
dc.titleHigher measured than modeled ozone production at increased NOx levels in the Colorado Front Rangeen_US
dc.typeJournal articleen_US
dc.creator.authorBaier, Bianca C
dc.creator.authorBrune, William H
dc.creator.authorMiller, David O
dc.creator.authorBlake, Donald
dc.creator.authorLong, Russell
dc.creator.authorWisthaler, Armin
dc.creator.authorCantrell, Christopher
dc.creator.authorFried, Alan
dc.creator.authorHeikes, Brian
dc.creator.authorBrown, Steven
dc.creator.authorMcDuffie, Erin
dc.creator.authorFlocke, Frank
dc.creator.authorApel, Eric
dc.creator.authorKaser, Lisa
dc.creator.authorWeinheimer, Andrew
cristin.unitcode185,15,12,62
cristin.unitnameMiljøvitenskap
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2
dc.identifier.cristin1553741
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Atmospheric Chemistry and Physics&rft.volume=17&rft.spage=11273&rft.date=2017
dc.identifier.jtitleAtmospheric Chemistry and Physics
dc.identifier.volume17
dc.identifier.issue18
dc.identifier.startpage11273
dc.identifier.endpage11292
dc.identifier.doihttp://dx.doi.org/10.5194/acp-17-11273-2017
dc.identifier.urnURN:NBN:no-63641
dc.type.documentTidsskriftartikkelen_US
dc.type.peerreviewedPeer reviewed
dc.source.issn1680-7316
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/61012/1/Baier%2Bet%2Bal..pdf
dc.type.versionPublishedVersion


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