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| Titel |
Hydrogen peroxide in the marine boundary layer over the South Atlantic during the OOMPH cruise in March 2007 |
| VerfasserIn |
H. Fischer, A. Pozzer, T. Schmitt, P. Jöckel, T. Klippel, D. Taraborrelli, J. Lelieveld  |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 12 ; Nr. 15, no. 12 (2015-06-29), S.6971-6980 |
| Datensatznummer |
250119853
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| Publikation (Nr.) |
 copernicus.org/acp-15-6971-2015.pdf |
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| Zusammenfassung |
| In the OOMPH (Ocean Organics Modifying Particles in both Hemispheres)
project a ship measurement cruise took place in the late austral summer from
01 to 23 March 2007. The French research vessel Marion
Dufresne sailed from Punta Arenas, Chile (70.85° W,
53.12° S), to Réunion island (55.36° E,
21.06° S) across the South Atlantic Ocean. In situ measurements
of hydrogen peroxide, methylhydroperoxide and ozone were performed and are
compared to simulations with the atmospheric chemistry global circulation
model EMAC (ECHAM/MESSy Atmospheric Chemistry). The model generally reproduces the measured trace gas levels,
but it underestimates hydrogen peroxide mixing ratios at high wind speeds,
indicating too-strong dry deposition to the ocean surface. An interesting
feature during the cruise is a strong increase of hydrogen peroxide,
methylhydroperoxide and ozone shortly after midnight off the west coast of
Africa due to an increase in the boundary layer height, leading to downward
transport from the free troposphere, which is qualitatively reproduced by
the model. |
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