World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Peroxy Radical Observations Over West Africa During the Amma 2006 Campaign: Photochemical Activity in Episodes of Formation of Convective Systems on the Basis of Radical Measurements : Volume 9, Issue 1 (16/01/2009)

By Andrés-hernández, M. D.

Click here to view

Book Id: WPLBN0003975042
Format Type: PDF Article :
File Size: Pages 35
Reproduction Date: 2015

Title: Peroxy Radical Observations Over West Africa During the Amma 2006 Campaign: Photochemical Activity in Episodes of Formation of Convective Systems on the Basis of Radical Measurements : Volume 9, Issue 1 (16/01/2009)  
Author: Andrés-hernández, M. D.
Volume: Vol. 9, Issue 1
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2009
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Burrows, J. P., Lichtenstern, M., Kartal, D., Reichert, L., Andrés-Hernández, M. D., Stock, P.,...Schlager, H. (2009). Peroxy Radical Observations Over West Africa During the Amma 2006 Campaign: Photochemical Activity in Episodes of Formation of Convective Systems on the Basis of Radical Measurements : Volume 9, Issue 1 (16/01/2009). Retrieved from http://www.ebooklibrary.org/


Description
Description: Institute of Environmental Physics, University of Bremen, Germany. 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 simultaneously emission of NOx, with a potential radical precursor (i.e., formaldehyde, acetone or peroxides) which has likely been transported to higher atmospheric layers. Based on the measurements, significant O3 production rates up to 2 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.


Summary
Peroxy radical observations over West Africa during the AMMA 2006 campaign: Photochemical activity in episodes of formation of convective systems on the basis of radical measurements

Excerpt
Agustí-Panareda, A. and Beljaars, A.: ECMWF's contribution to AMMA, ECMWF Newsletter, No. 115, Springer, 2008.; Ancellet, G., Leclair de Bellevue, J., Mari, C., Nedelec, P., Kukui, A., Borbon, A., and Perros, P.: Role of convective transport on tropospheric ozone chemistry revealed by aircraft observations during the wet season of the AMMA campaign, Atmos. Chem. Phys. Discuss., 8, 15941–15996, 2008.; Burkert, J., Andrés-Hernández, M. D, Reichert, L., Meyer-Arnek, J., Doddridge, B,. Dickerson, R. R., Muehle, J., Zahn, A., Carsey, T., and Burrows, J. P.: Trace gas and radical diurnal behavior in the marine boundary layer during INDOEX 1999, J. Geophys. Res., 108(D8), 8000, doi:10.1029/2002JD002790, 2003.; Cantrell, C. A., Edwards, G. D., Stephens, S., Mauldin, L., et al.: Peroxy radical behaviour during the Transport and Chemical Evolution over the Pacific (TRACE-P) campaign as measured aboard the NASA P-3B aircraft, J. Geophys. Res., 108(D20), 8797, doi:10.1029/2003JD003674, 2003a.; Cantrell, C. A., Edwards, G. D., Stephens, S., Mauldin, L., Kosciuch, E., Zondlo, M., and Eisele, F.: Peroxy radical observations using chemical ionization mass spectrometry during TOPSE, J. Geophys. Res., 108(D6), 8371, doi:10.1029/2002JD002715, 2003b.; Cohan, D. S., Schultz, M. G., and Jacob, D. J.: Convective injection and photochemical decay of peroxides in the tropical upper troposphere: methyl iodide as a tracer of marine convection, J. Geophys. Res., 104(D5), 5717–5724, 1999.; Faloona, I., Tan, D., Brune, W. H., Jaeglé, L. D., Jacob, J., et al.: Observations of HOx and its relationship with NOx in the upper troposphere during SONEX, J. Geophys. Res., 105(D3), 3771–3783, 2000.; Folkins, I., Wennberg, P. O., Hanisco, T. F., Anderson, J. G., and Salawitch, R. J.: OH, HO2, and NO in two biomass burning plumes: Sources of HOx and implications for ozone production, Geophys. Res. Lett., 24, 3185–3188, 1997.; Jaeglé, L., Jacob, D. J., Brune, W. H., and Wennberg, P. O.: Chemistry of HOx radicals in the upper troposphere, Atmos. Environ., 35, 469–489, 2001.; Gerbig, C., Kley, D., Volz-Thomas, A., et al.: Fast response resonance fluorescence CO measurements aboard the C-130: Instrument characterisation and measurements made during North Atlantic Regional Experiment 1993, J. Geophys. Res., 101, 29229–29238, 1996.; Jaeglé, L., Jacob, D. J., Wennberg, P. O., et al.: Observed OH and HO2 in the upper troposphere suggest a major source from convective injection of peroxides, Geophys. Res. Lett., 24, 3181–3184, 1997.; Kartal, D., Andrés-Hernández, M. D., Reichert, L., Schlager, H., and Burrows, J. P.: Characterisation of peroxy radical measurements over West Africa on board the DLR-Falcon aircraft during the AMMA 2006 campaign, to be submitted to ACP, AMMA Special Section, 2009.; Lelieveld, J., Butler T. M., Crowley, J. N., et al.: Atmospheric oxidation capacity sustained by a tropical forest, Letters to Nature, 452, 737–740, doi:10.1038/nature06870, 2008.; Mari, C. H., Cailley, G., Corre, L., Saunois, M., Attié, J. L., Thouret, V., and Stohl, A.: Tracing biomass burning plumes from the Southern Hemisphere during the AMMA 2006 wet season experiment, Atmos. Chem. Phys., 8, 3951–3961, 2008.; McKeen, S. A., Gierczak, T., Burkholder J. B., et al.: The photochemistry of acetone in the upper troposphere: a source of odd-hydrogen radicals, Geophys. Res. Lett., 24(24), 3177–3180, 1997.; Meyer-Arnek, J., Ladstätter-Weißenmayer, A., Richter, A., Wittrock, F., and Burrows, J. P.: A study of the trace gas columns of O3, NO2 and HCHO over Africa in September 1997, Faraday Discuss., 130, 387–405, doi:10.1039/b502106p, 2005.; Prather, M. J. and Jacob, D. J.: A persistent imbalance in HOx and NOx photochemistry of the upper troposphere driven by dee

 

Click To View

Additional Books


  • Oxalic Acid as a Heterogeneous Ice Nucle... (by )
  • Attribution of Aerosol Light Absorption ... (by )
  • Forecasted Deep Stratospheric Intrusions... (by )
  • A Tga/Ft-ir Study for Measuring Oc and E... (by )
  • Long-term Tropospheric Formaldehyde Conc... (by )
  • Constraints on Ship NoX Emissions in Eur... (by )
  • A Modelling Study of Moisture Redistribu... (by )
  • Transport Pathways of Peroxyacetyl Nitra... (by )
  • Balloon-borne Radiometer Measurements of... (by )
  • Retrieval of Aerosol Complex Refractive ... (by )
  • Spatial, Temporal and Vertical Distribut... (by )
  • Aviation 2006 NoX-induced Effects on Atm... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.