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dc.contributor.authorJacob, Daniel James
dc.contributor.authorHeikes, E. G.
dc.contributor.authorFan, S.-M.
dc.contributor.authorLogan, Jennifer A.
dc.contributor.authorMauzerall, D. L.
dc.contributor.authorBradshaw, J. D.
dc.contributor.authorSingh, H. B.
dc.contributor.authorGregory, G. L.
dc.contributor.authorTalbot, R. W.
dc.contributor.authorBlake, D. R.
dc.contributor.authorSachse, G. W.
dc.date.accessioned2015-02-25T20:53:18Z
dc.date.issued1996
dc.identifier.citationJacob, D. J., E. G. Heikes, S.-M. Fan, J. A. Logan, D. L. Mauzerall, J. D. Bradshaw, H. B. Singh, et al. 1996. “ Origin of Ozone and NO x in the Tropical Troposphere: A Photochemical Analysis of Aircraft Observations over the South Atlantic Basin .” Journal of Geophysical Research 101 (D19): 24235. doi:10.1029/96jd00336.en_US
dc.identifier.issn0148-0227en_US
dc.identifier.issn2156-2202en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:14034191
dc.description.abstractThe photochemistry of the troposphere over the South Atlantic basin is examined by modeling of aircraft observations up to 12-km altitude taken during the TRACE A expedition in September–October 1992. A close balance is found in the 0 to 12-km column between photochemical production and loss of O3, with net production at high altitudes compensating for weak net loss at low altitudes. This balance implies that O3 concentrations in the 0–12 km column can be explained solely by in situ photochemistry; influx from the stratosphere is negligible. Simulation of H2O2, CH3OOH, and CH2O concentrations measured aboard the aircraft lends confidence in the computations of O3 production and loss rates, although there appears to be a major gap in current understanding of CH2O chemistry in the marine boundary layer. The primary sources of NOx over the South Atlantic Basin appear to be continental (biomass burning, lightning, soils). There is evidence that NOx throughout the 0 to 12-km column is recycled from its oxidation products rather than directly transported from its primary sources. There is also evidence for rapid conversion of HNO3 to NOx in the upper troposphere by a mechanism not included in current models. A general representation of the O3 budget in the tropical troposphere is proposed that couples the large-scale Walker circulation and in situ photochemistry. Deep convection in the rising branches of the Walker circulation injects NOx from combustion, soils, and lightning to the upper troposphere, leading to O3 production; eventually, the air subsides and net O3 loss takes place in the lower troposphere, closing the O3 cycle. This scheme implies a great sensitivity of the oxidizing power of the atmosphere to NOx emissions in the tropics.en_US
dc.description.sponsorshipEngineering and Applied Sciencesen_US
dc.language.isoen_USen_US
dc.publisherWiley-Blackwellen_US
dc.relation.isversionofdoi:10.1029/96JD00336en_US
dc.relation.hasversionhttp://www.princeton.edu/~mauzeral/papers/96JD00336_Jacob.pdfen_US
dash.licenseLAA
dc.titleOrigin of ozone and NO x in the tropical troposphere: A photochemical analysis of aircraft observations over the South Atlantic basinen_US
dc.typeJournal Articleen_US
dc.description.versionVersion of Recorden_US
dc.relation.journalJournal of Geophysical Researchen_US
dash.depositing.authorJacob, Daniel James
dc.date.available2015-02-25T20:53:18Z
dc.identifier.doi10.1029/96JD00336*
dash.authorsorderedfalse
dash.contributor.affiliatedLogan, Jennifer
dash.contributor.affiliatedJacob, Daniel


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