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  Shipborne measurements of ClNO2 in the Mediterranean Sea and around the Arabian Peninsula during summer

Eger, P. G., Friedrich, N., Schuladen, J., Shenolikar, J., Fischer, H., Tadic, I., et al. (2019). Shipborne measurements of ClNO2 in the Mediterranean Sea and around the Arabian Peninsula during summer. Atmospheric Chemistry and Physics, 19(19), 12121-12140. doi:10.5194/acp-19-12121-2019.

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Eger, Philipp G.1, Autor           
Friedrich, Nils1, Autor           
Schuladen, Jan1, Autor           
Shenolikar, Justin1, Autor           
Fischer, Horst1, Autor           
Tadic, Ivan1, Autor           
Harder, Hartwig1, Autor           
Martinez, Monica1, Autor           
Rohloff, Roland1, Autor           
Tauer, Sebastian1, Autor           
Drewnick, Frank2, Autor           
Fachinger, Friederike2, Autor           
Brooks, James3, Autor
Darbyshire, Eoghan3, Autor
Sciare, Jean3, Autor
Pikridas, Michael3, Autor
Lelieveld, Jos1, Autor           
Crowley, John N.1, Autor           
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              
2Particle Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826291              
3external, ou_persistent22              

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 Zusammenfassung: Shipborne measurements of nitryl chloride (ClNO2), hydrogen chloride (HCl) and sulfur dioxide (SO2) were made during the AQABA (Air Quality and climate change in the Arabian BAsin) ship campaign in summer 2017. The dataset includes measurements over the Mediterranean Sea, the Suez Canal, the Red Sea, the Gulf of Aden, the Arabian Sea, the Gulf of Oman, and the Arabian Gulf (also known as Persian Gulf) with observed ClNO2 mixing ratios ranging from the limit of detection to ≈600 pptv. We examined the regional variability in the generation of ClNO2 via the uptake of dinitrogen pentoxide (N2O5) to Cl-containing aerosol and its importance for Cl atom generation in a marine boundary layer under the (variable) influence of emissions from shipping and the oil industry. The yield of ClNO2 formation per NO3 radical generated was generally low (median of ≈1 %-5 % depending on the region), mainly as a result of gas-phase loss of NO3 dominating over heterogeneous loss of N2O5, the latter being disfavoured by the high temperatures found throughout the campaign. The contributions of ClNO2 photolysis and OH-induced HCl oxidation to Cl-radical formation were derived and their relative contributions over the did cycle compared. The results indicate that over the northern Red Sea, the Gulf of Suez, and the Gulf of Oman the formation of Cl atoms will enhance the oxidation rates of some volatile organic compounds (VOCs), especially in the early morning.

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 Datum: 2019
 Publikationsstatus: Erschienen
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 Identifikatoren: ISI: 000488976600003
DOI: 10.5194/acp-19-12121-2019
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Titel: Atmospheric Chemistry and Physics
  Kurztitel : ACP
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Göttingen : Copernicus Publications
Seiten: - Band / Heft: 19 (19) Artikelnummer: - Start- / Endseite: 12121 - 12140 Identifikator: ISSN: 1680-7316
CoNE: https://pure.mpg.de/cone/journals/resource/111030403014016