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  Influence of corona discharge on the ozone budget in the tropical free troposphere: a case study of deep convection during GABRIEL

Bozem, H., Fischer, H., Gurk, C., Schiller, C. L., Parchatka, U., Koenigstedt, R., et al. (2014). Influence of corona discharge on the ozone budget in the tropical free troposphere: a case study of deep convection during GABRIEL. Atmospheric Chemistry and Physics, 14(17), 8917-8931. doi:10.5194/acp-14-8917-2014.

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Bozem, H.1, Author              
Fischer, H.1, Author              
Gurk, C.1, Author              
Schiller, C. L.2, Author
Parchatka, U.1, Author              
Koenigstedt, R.1, Author              
Stickler, A.1, Author              
Martinez, M.1, Author              
Harder, H.1, Author              
Kubistin, D.1, Author              
Williams, J.1, Author              
Eerdekens, G.1, Author              
Lelieveld, J.1, Author              
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              
2external, ou_persistent22              

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 Abstract: Convective redistribution of ozone and its precursors between the boundary layer (BL) and the free troposphere (FT) influences photochemistry, in particular in the middle and upper troposphere (UT). We present a case study of convective transport during the GABRIEL campaign over the tropical rain forest in Suriname in October 2005. During one measurement flight the inflow and outflow regions of a cumulonimbus cloud (Cb) have been characterized. We identified a distinct layer between 9 and 11 km altitude with enhanced mixing ratios of CO, O-3, HOx, acetone and acetonitrile. The elevated O-3 contradicts the expectation that convective transport brings low-ozone air from the boundary layer to the outflow region. Entrainment of ozone-rich air is estimated to account for 62% (range: 33-91 %) of the observed O-3. Ozone is enhanced by only 5-6% by photochemical production in the outflow due to enhanced NO from lightning, based on model calculations using observations including the first reported HOx measurements over the tropical rainforest. The "excess" ozone in the outflow is most probably due to direct production by corona discharge associated with lightning. We deduce a production rate of 5.12x10(28) molecules O-3 flash(-1) (range: 9.89 x 10(26)-9.82 x 10(28) molecules O-3 flash(-1)), which is at the upper limit of the range reported previously.

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 Dates: 2014
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: ISI: 000341992000005
DOI: 10.5194/acp-14-8917-2014
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Title: Atmospheric Chemistry and Physics
Source Genre: Journal
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Publ. Info: Katlenburg-Lindau, Germany : European Geosciences Union
Pages: - Volume / Issue: 14 (17) Sequence Number: - Start / End Page: 8917 - 8931 Identifier: ISSN: 1680-7316
CoNE: https://pure.mpg.de/cone/journals/resource/111030403014016