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Peroxy radical observations over West Africa during AMMA 2006: photochemical activity in the outflow of convective systems

Andrés-Hernández, M.D. and Kartal, D. and Reichert, L. and Burrows, J.P. and Meyer Arnek, J. and Lichtenstern, M. and Stock, P. and Schlager, H. (2009) Peroxy radical observations over West Africa during AMMA 2006: photochemical activity in the outflow of convective systems. Atmospheric Chemistry and Physics, 9, pp. 3681-3695.

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Official URL: http://direct.sref.org/1680-7324/acp/2009-9-3681

Abstract

Peroxy radical measurements made on board the DLR-Falcon research aircraft over West Africa within the African Monsoon Multidisciplinary Analysis (AMMA) campaign during the 2006 wet monsoon are presented in this study. The analysis of data focuses on the photochemical activity of air masses sampled during episodes of intense convection and biomass burning. Generally, the total sum of peroxy radical mixing ratios, measured in the outflow of convective clouds, are quite variable but occasionally are coupled with the NO variations indicating the coexistence or simultaneous emission of NOx, with a potential radical precursor (i.e. formaldehyde, acetone or peroxides), which has likely been transported to higher atmospheric altitudes. Based on the measurements, significant O3 production rates around 1 ppb/h in the MCS outflow are estimated by using a box model with simplified chemistry. Peroxy radicals having mixing ratios around 20�25 pptv and with peak values of up to 60�70 pptv are measured within biomass burning plumes, detected at the coast in Ghana. Calculations of back-trajectory densities confirm the origin of these air masses being a biomass burning region at southern latitudes and close to the Gulf of Guinea, according to satellite pictures. Measured peroxy radical concentrations agree reasonably with modelled estimations taking into account simple local chemistry. Moreover, the vertical profiles taken at the aircraft base in Ouagadougou, Burkina Faso, indicate the common feature of having maximum concentrations between 2 and 4 km, in agreement with other literature values obtained under similar conditions.

Document Type:Article
Title:Peroxy radical observations over West Africa during AMMA 2006: photochemical activity in the outflow of convective systems
Authors:
AuthorsInstitution or Email of Authors
Andrés-Hernández, M.D.Univ. of Bremen
Kartal, D.Univ. of Bremen
Reichert, L.Univ. of Bremen
Burrows, J.P.Univ. of Bremen
Meyer Arnek, J.DFD, Oberpfaffenhofen
Lichtenstern, M.UNSPECIFIED
Stock, P.UNSPECIFIED
Schlager, H.UNSPECIFIED
Date:2009
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
In Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:9
Page Range:pp. 3681-3695
Status:Published
Keywords:AMMA
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Jana Freund
Deposited On:30 Jul 2009 13:25
Last Modified:12 Dec 2013 20:38

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