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First measurements of H₂O₂ and organic peroxides surface fluxes by the relaxed eddy-accumulation technique

Titelangaben

Valverde-Canossa, Jessica ; Ganzeveld, Laurens ; Rappenglück, Bernhard ; Steinbrecher, Rainer ; Klemm, Otto ; Schuster, G. ; Moortgat, Geert K.:
First measurements of H₂O₂ and organic peroxides surface fluxes by the relaxed eddy-accumulation technique.
In: Atmospheric Environment. Bd. 40 (2006) Heft Suppl. 1 . - S. 55-67.
ISSN 1873-2844
DOI: https://doi.org/10.1016/j.atmosenv.2006.03.038

Abstract

The relaxed eddy-accumulation (REA) technique was specially adapted to a high-performance liquid chromatographer (enzymatic method) and scrubbing coils to measure concentrations and fluxes of hydrogen peroxide (H2O2) and organic peroxides with a carbon chain ⩽C4, of which only methylhydroperoxide (MHP) and hydroxymethylhydroperoxide (HMHP) were detected. Flux measurements were carried out above the canopy of a Norway spruce forest in Germany (775 m a.s.l.) in NE Bavaria, Germany, during the BEWA2000 research cluster in summer 2001. This period was characterised by H2O2 maximum mixing ratios of 1 ppb and mixing ratios of organic peroxides below 200 ppt. Daily mean H2O2 deposition fluxes of −0.8±0.3 nmol m−2 s−1, MHP of −0.03±0.03 nmol m−2 s−1 and HMHP of −0.7±0.5 nmol m−2 s−1 were obtained. Profile measurements were performed as a qualitative comparison of the controlling mechanism of the surface exchanges. The REA as well as the profile measurements show that during daylight the surface exchanges of H2O2 and MHP over coniferous forest are mainly controlled by dry deposition. The high H2O2 dry-deposition velocity suggests a negligible surface uptake resistance for H2O2, whereas the significantly smaller MHP-deposition velocity indicates a significant surface uptake resistance. However, nighttime surface exchanges of these compounds should be further investigated since the in-canopy ozonolysis reaction is expected to affect exchanges. HMHP REA flux measurements show mainly deposition, whereas the ones based on the profile method suggest in-canopy chemical production.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER43794
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Ehemalige Professoren > Professur Mikrometeorologie - Univ.-Prof. Dr. Thomas Foken
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Ehemalige Professoren
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 11 Sep 2015 06:33
Letzte Änderung: 13 Apr 2018 09:56
URI: https://eref.uni-bayreuth.de/id/eprint/19182