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

Borbon, A. and Ruiz, M. and Bechara, J. and Aumont, B. and Chong, M. and Huntrieser, H. and Mari, C. and Reeves, C.E. and Scialom, G. and Hamburger, T. and Stark, H. and Afif, C. and Jambert, C. and Mills, G. and Schlager, H. and 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), pp. 1-19. American Geophysical Union. DOI: 10.1029/2011JD017121.

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


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.

Document Type:Article
Title:Transport and chemistry of formaldehyde by mesoscale convective systems in West Africa during AMMA 2006
AuthorsInstitution or Email of Authors
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
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-19
Publisher:American Geophysical Union
Keywords:West Africa, convection, airborne measurements, trace gases
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:ATM and Operation
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Climate, Weather and Environment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Dr.rer.nat. Heidi Huntrieser
Deposited On:02 Jul 2012 16:50
Last Modified:23 Jan 2014 11:36

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