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  Net ozone production and its relationship to nitrogen oxides and volatile organic compounds in the marine boundary layer around the Arabian Peninsula

Tadic, I., Crowley, J. N., Dienhart, D., Eger, P., Harder, H., Hottmann, B., et al. (2020). Net ozone production and its relationship to nitrogen oxides and volatile organic compounds in the marine boundary layer around the Arabian Peninsula. Atmospheric Chemistry and Physics, 20(11), 6769-6787. doi:10.5194/acp-20-6769-2020.

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 Creators:
Tadic, Ivan1, Author              
Crowley, John N.1, Author              
Dienhart, Dirk1, Author              
Eger, Philipp1, Author              
Harder, Hartwig1, Author              
Hottmann, Bettina1, Author              
Martinez, Monica1, Author              
Parchatka, Uwe1, Author              
Paris, Jean-Daniel2, Author
Pozzer, Andrea1, Author              
Rohloff, Roland1, Author              
Schuladen, Jan1, Author              
Shenolikar, Justin1, Author              
Tauer, Sebastian1, Author              
Lelieveld, Jos1, Author              
Fischer, Horst1, Author              
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              
2external, ou_persistent22              

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 Abstract: Strongly enhanced tropospheric ozone (O3) mixing ratios have been reported in the Arabian Basin, a region with intense solar radiation and high concentrations of O3 precursors such as nitrogen oxides (NOx) and volatile organic compounds (VOCs). To analyze photochemical O3 production in the marine boundary layer (MBL) around the Arabian Peninsula, we use shipborne observations of NO, NO2, O3, OH, HO2, HCHO, the actinic flux, water vapor, pressure and temperature obtained during the summer 2017 Air Quality and Climate in the Arabian Basin (AQABA) campaign, and we compare them to simulation results from the ECHAM-MESSy Atmospheric Chemistry (EMAC) general circulation model. Net O3 production rates (NOPRs) were greatest over both the Gulf of Oman and the northern Red Sea (16 ppbv d-1) and over the Arabian Gulf (32 ppbv d-1). The NOPR over the Mediterranean, the southern Red Sea and the Arabian Sea did not significantly deviate from zero; however, the results for the Arabian Sea indicated weak net O3 production of 5 ppbv d-1 as well as net O3 destruction over the Mediterranean and the southern Red Sea with values of -1 and -4 ppbv d(-1), respectively. Constrained by HCHO/NO2 ratios, our photochemistry calculations show that net O3 production in the MBL around the Arabian Peninsula mostly occurs in NOx-limited regimes with a significant share of O3 production occurring in the transition regime between NOx limitation and VOC limitation over the Mediterranean and more significantly over the northern Red Sea and Oman Gulf.

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 Dates: 2020
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: ISI: 000541473000002
DOI: 10.5194/acp-20-6769-2020
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Title: Atmospheric Chemistry and Physics
  Abbreviation : ACP
Source Genre: Journal
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Publ. Info: Göttingen : Copernicus Publications
Pages: - Volume / Issue: 20 (11) Sequence Number: - Start / End Page: 6769 - 6787 Identifier: ISSN: 1680-7316
CoNE: https://pure.mpg.de/cone/journals/resource/111030403014016