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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. und Kartal, D. und Reichert, L. und Burrows, J.P. und Meyer Arnek, J. und Lichtenstern, M. und Stock, P. und 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, Seiten 3681-3695.

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

Kurzfassung

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.

Dokumentart:Zeitschriftenbeitrag
Titel:Peroxy radical observations over West Africa during AMMA 2006: photochemical activity in the outflow of convective systems
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
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.NICHT SPEZIFIZIERT
Stock, P.NICHT SPEZIFIZIERT
Schlager, H.NICHT SPEZIFIZIERT
Datum:2009
Erschienen in:Atmospheric Chemistry and Physics
Referierte Publikation:Ja
In Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:9
Seitenbereich:Seiten 3681-3695
Status:veröffentlicht
Stichwörter:AMMA
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Atmosphären- und Klimaforschung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe
Hinterlegt von: Jana Freund
Hinterlegt am:30 Jul 2009 13:25
Letzte Änderung:12 Dez 2013 20:38

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