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Distribution of hydrogen peroxide and formaldehyde over Central Europe during the HOOVER project

Klippel, T. and Fischer, H. and Bozem, H. and Lawrence, M. G. and Butler, T. and Jöckel, P. and Tost, H. and Martinez, M. and Harder, H. and Regelin, E. and Sander, R. and Schiller, C. L. and Stickler, A. and Lelieveld, J. (2011) Distribution of hydrogen peroxide and formaldehyde over Central Europe during the HOOVER project. Atmospheric Chemistry and Physics, 11, pp. 4391-4410. DOI: 10.5194/acp-11-4391-2011.

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Official URL: http://www.atmos-chem-phys.net/11/4391/2011/


In this study we report measurements of hydrogen peroxide (H2O2), methyl hydroperoxide* (MHP* as a proxy of MHP based on an unspecific measurement of total organic peroxides) and formaldehyde (HCHO) from the HOx OVer EuRope (HOOVER) project (HOx = OH+HO2). HOOVER included two airborne field campaigns, in October 2006 and July 2007. Measurement flights were conducted from the base of operation Hohn (Germany, 54�° N, 9�° E) towards the Mediterranean and to the subpolar regions over Norway. We find negative concentration gradients with increasing latitude throughout the troposphere for H2O2 and CH3OOH*. In contrast, observed HCHO is almost homogeneously distributed over central and northern Europe and is elevated over the Mediterranean. In general, the measured gradients tend to be steepest entering the Mediterranean region, where we also find the highest abundances of the 3 species. Mixing ratios of these tracers generally decrease with altitude. H2O2 and CH3OOH* show maxima above the boundary layer at 2â��5 km, being more distinct over southern than over northern Europe. We also present a comparison of our data with simulations by two global 3-D-models, MATCH-MPIC and EMAC, and with the box model CAABA. The models realistically represent altitude and latitude gradients for both HCHO and hydroperoxides (ROOH). In contrast, the models have problems reproducing the absolute mixing ratios, in particular of H2O2. Large uncertainties about retention coefficients and cloud microphysical parameters suggest that cloud scavenging might be a large source of error for the simulation of H2O2. A sensitivity study with EMAC shows a strong influence of cloud and precipitation scavenging on the budget of H2O2 as simulations improve significantly with this effect switched off.

Document Type:Article
Title:Distribution of hydrogen peroxide and formaldehyde over Central Europe during the HOOVER project
AuthorsInstitution or Email of Authors
Klippel, T.MPIC, Mainz
Fischer, H.Host.Fischer@mpic.de
Bozem, H.MPIC, Mainz
Lawrence, M. G.MPIC, Mainz
Butler, T.MPIC, Mainz
Jöckel, P.Patrick.Joeckel@dlr.de
Tost, H.MPIC, Mainz
Martinez, M.MPIC, Mainz
Harder, H.MPIC, Mainz
Regelin, E.MPIC, Mainz
Sander, R.MPIC, Mainz
Schiller, C. L.Univ. Bern, CH
Stickler, A.MPIC, Mainz
Lelieveld, J.MPIC, Mainz
Date:11 May 2011
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
In Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 4391-4410
Keywords:atmospheric chemistry, formaldehyde, hydrogen peroxide, atmospheric chemistry modeling
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Dynamics
Deposited By: Patrick Jöckel
Deposited On:21 Nov 2011 10:36
Last Modified:12 Dec 2013 21:25

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