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Transport and chemistry of formaldehyde by mesoscale convective systems in West Africa during AMMA 2006

Borbon, A. und Ruiz, M. und Bechara, J. und Aumont, B. und Chong, M. und Huntrieser, H. und Mari, C. und Reeves, C.E. und Scialom, G. und Hamburger, T. und Stark, H. und Afif, C. und Jambert, C. und Mills, G. und Schlager, H. und Perros, P. E. (2012) Transport and chemistry of formaldehyde by mesoscale convective systems in West Africa during AMMA 2006. Journal of Geophysical Research, 117 (D12301), Seiten 1-19. American Geophysical Union. DOI: 10.1029/2011JD017121.

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Offizielle URL: http://www.agu.org/pubs/crossref/2012/2011JD017121.shtml

Kurzfassung

In situ measurements of formaldehyde (CH O) onboard four European research aircraft in August 2006 as part of the African Monsoon Multidisciplinary Analysis (AMMA) experiment in West Africa are used (1) to examine the redistribution of CH O by mesoscale convective systems (MCS) in the tropical upper troposphere (UT), (2) to evaluate the scavenging efficiency (SE) of CH O by MCS and (3) to quantify the impact of CH O on UT photooxidant production downwind of MCS. The intercomparison of CH O measurements is first tested, providing a unique and consistent 3-D-spatially resolved CH O database in background and convective conditions. While carbon monoxide (CO) is vertically uplifted by deep convection up to 12 km, CH O is also affected by cloud processing as seen from its ratio relative to CO with altitude. A new observation-based model is established to quantify the SE of CH O. This model shows that convective entrainment of free tropospheric air cannot be neglected since it contributes to 40% of the convective UT air. For the 4 studied MCS, SE shows a large variability within a 4% to 39% range at a relative standard deviation of 30%, which is consistent with MCS features. A time-dependent photochemical box model is applied to convective UT air. After convection, 60% of CH O is due to its photochemical production rather than to its direct transport. Model results indicate that CH O directly injected by convection does not impact ozone and HOx production in the tropical UT of West Africa. NOx and anthropogenic hydrocarbon precursors dominate the secondary production of CH O, ozone and HOx.

Dokumentart:Zeitschriftenbeitrag
Titel:Transport and chemistry of formaldehyde by mesoscale convective systems in West Africa during AMMA 2006
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Borbon, A.Univ. Paris Est Creteil, Créteil, F
Ruiz, M.Univ. Paris Est Creteil, Créteil, F
Bechara, J.Univ. Paris Est Creteil, Créteil, F
Aumont, B.Univ. Paris Est Creteil, Créteil, F
Chong, M.Univ. de Toulouse, Toulouse, F
Huntrieser, H.DLR
Mari, C.Univ. Paul Sabatier and CNRS, Toulouse, F
Reeves, C.E.Univ. of East Anglia, Norwich, UK
Scialom, G.IPSL, Guyancourt, F
Hamburger, T.DLR
Stark, H.National Oceanic and Atmospheric Administration, Boulder, CO, USA
Afif, C.Univ. Paris Est Creteil, Créteil, F
Jambert, C.Univ. de Toulouse, Toulouse, F
Mills, G.Univ. of East Anglia, Norwich, UK
Schlager, H.DLR
Perros, P. E.Univ. Paris Est Creteil, Créteil, F
Datum:2012
Erschienen in:Journal of Geophysical Research
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:117
DOI :10.1029/2011JD017121
Seitenbereich:Seiten 1-19
Verlag:American Geophysical Union
Status:veröffentlicht
Stichwörter:West Africa, convection, airborne measurements, trace gases
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:ATM und Flugbetrieb
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AO - Luftverkehrsmanagement und Flugbetrieb
DLR - Teilgebiet (Projekt, Vorhaben):L - Klima, Wetter und Umwelt
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe
Hinterlegt von: Dr.rer.nat. Heidi Huntrieser
Hinterlegt am:02 Jul 2012 16:50
Letzte Änderung:23 Jan 2014 11:36

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