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  Measurements of nitrous acid, HOx and NOx in the upper troposphere: Is peroxynitrous acid a missing source of HONO?

Weyland, B., Kluge, F., Pfeilsticker, K., Rohloff, R., Harder, H., Tadic, I., Fischer, H., Doerich, R., Crowley, J., Bohn, B., Taraborrelli, D., Rosanka, S., Obersteiner, F. (2023): Measurements of nitrous acid, HOx and NOx in the upper troposphere: Is peroxynitrous acid a missing source of HONO? - XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG), XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1809

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017779 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017779_1
Genre: Conference Paper

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 Creators:
Weyland, Benjamin1, Author
Kluge, Flora1, Author
Pfeilsticker, Klaus1, Author
Rohloff, Roland1, Author
Harder, Hartwig1, Author
Tadic, Ivan1, Author
Fischer, Horst1, Author
Doerich, Raphael1, Author
Crowley, John1, Author
Bohn, Birger1, Author
Taraborrelli, Domenico1, Author
Rosanka, Simon1, Author
Obersteiner, Florian1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: Discrepancies between expected and observed NO-NO2 ratios in the upper troposphere suggest the presence of an unknown NOX reservoir. We report on airborne remote sensing limb observations from the mini-DOAS instrument on board the HALO (High Altitude Long Range) aircraft during the CAFÉ-Africa (Chemistry of the Atmosphere Field Experiment) campaign in 2018. Nitrous acid (HONO) slant column densities in limb scattered sunlight in the ultraviolet wavelength range retrieved by DOAS (Differential Optical Absorption Spectroscopy) are converted to volume mixing ratios using the O3 / O4 scaling method. Over the tropical Atlantic Ocean, in the cold upper troposphere, HONO is found in excess of what may be expected from known gas phase formation mechanisms or is predicted by the ECHAM/MESSy Atmospheric Chemistry (EMAC) model. At these altitudes (10-15 km), heterogeneous sources of the excess HONO are inefficient and thus unlikely. Therefore, we investigate the possibility of a gas phase HONO source, namely the oxidation of peroxynitrous acid (HOONO) formed in the reactions NO + HO2 and OH + NO2. Since there are no reported atmospheric measurements of HOONO, we use complementary, simultaneous in situ measurements of OH, NO, HO2, NO2, O3 and photolysis frequencies from onboard HALO to make steady state arguments and quantify reaction rate coefficients for both formation pathways and destruction of HOONO by O3, OH, and NO, the last of which may form HONO and NO2.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-1809
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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