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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Seasonal characteristics of tropical marine boundary layer air measured at the cape verde atmospheric observatory
Journal of Atmospheric Chemistry, Volume 67, No. 2-3, Year 2010
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Description
Observations of the tropical atmosphere are fundamental to the understanding of global changes in air quality, atmospheric oxidation capacity and climate, yet the tropics are under-populated with long-term measurements. The first three years (October 2006-September 2009) of meteorological, trace gas and particulate data from the global WMO/Global Atmospheric Watch (GAW) Cape Verde Atmospheric Observatory Humberto Duarte Fonseca (CVAO; 16° 51′ N, 24° 52′ W) are presented, along with a characterisation of the origin and pathways of air masses arriving at the station using the NAME dispersion model and simulations of dust deposition using the COSMO-MUSCAT dust model. The observations show a strong influence from Saharan dust in winter with a maximum in super-micron aerosol and particulate iron and aluminium. The dust model results match the magnitude and daily variations of dust events, but in the region of the CVAO underestimate the measured aerosol optical thickness (AOT) because of contributions from other aerosol. The NAME model also captured the dust events, giving confidence in its ability to correctly identify air mass origins and pathways in this region. Dissolution experiments on collected dust samples showed a strong correlation between soluble Fe and Al and measured solubilities were lower at high atmospheric dust concentrations. Fine mode aerosol at the CVAO contains a significant fraction of non-sea salt components including dicarboxylic acids, methanesulfonic acid and aliphatic amines, all believed to be of oceanic origin. A marine influence is also apparent in the year-round presence of iodine and bromine monoxide (IO and BrO), with IO suggested to be confined mainly to the surface few hundred metres but BrO well mixed in the boundary layer. Enhanced CO 2 and CH 4 and depleted oxygen concentrations are markers for air-sea exchange over the nearby northwest African coastal upwelling area. Long-range transport results in generally higher levels of O 3 and anthropogenic non-methane hydrocarbons (NMHC) in air originating from North America. Ozone/CO ratios were highest (up to 0.42) in relatively fresh European air masses. In air heavily influenced by Saharan dust the O 3/CO ratio was as low as 0.13, possibly indicating O 3 uptake to dust. Nitrogen oxides (NO x and NO y) show generally higher concentrations in winter when air mass origins are predominantly from Africa. High photochemical activity at the site is shown by maximum spring/summer concentrations of OH and HO 2 of 9×10 6 molecule cm -3 and 6×10 8 molecule cm -3, respectively. After the primary photolysis source, the most important controls on the HO x budget in this region are IO and BrO chemistry, the abundance of HCHO, and uptake of HO x to aerosol. © 2011 Springer Science+Business Media B.V.
Authors & Co-Authors
Carpenter, Lucy J.
United Kingdom, York
University of York
Fleming, Zoë L.
United Kingdom, Leicester
University of Leicester
Read, Katie A.
United Kingdom, York
University of York
Lee, James D.
United Kingdom, York
University of York
Moller, Sarah J.
United Kingdom, York
University of York
Hopkins, James R.
United Kingdom, York
University of York
Purvis, Ruth M.
United Kingdom, York
University of York
Lewis, Alastair C.
United Kingdom, York
University of York
Müller, Konrad
Germany, Leipzig
Leibniz Institute for Tropospheric Research
Heinold, Bernd
Germany, Leipzig
Leibniz Institute for Tropospheric Research
Herrmann, Hartmut
Germany, Leipzig
Leibniz Institute for Tropospheric Research
Fomba, Khanneh Wadinga
Germany, Leipzig
Leibniz Institute for Tropospheric Research
van Pinxteren, Dominik
Germany, Leipzig
Leibniz Institute for Tropospheric Research
Müller, Conny
Germany, Leipzig
Leibniz Institute for Tropospheric Research
Tegen, Ina
Germany, Leipzig
Leibniz Institute for Tropospheric Research
Wiedensohler, Alfred
Germany, Leipzig
Leibniz Institute for Tropospheric Research
Mueller, Thomas J.
Germany, Leipzig
Leibniz Institute for Tropospheric Research
Niedermeier, N.
Germany, Leipzig
Leibniz Institute for Tropospheric Research
Achterberg, Eric P.
United Kingdom, Southampton
University of Southampton
Patey, Matthew David
United Kingdom, Southampton
University of Southampton
Kozlova, Elena A.
Germany, Jena
Max Planck Institute for Biogeochemistry
United Kingdom, Norwich
University of East Anglia
Heimann, Martin
Germany, Jena
Max Planck Institute for Biogeochemistry
Heard, Dwayne E.
United Kingdom, Leeds
University of Leeds
Plane, John M.C.
United Kingdom, Leeds
University of Leeds
Mahajan, Anoop S.
United Kingdom, Leeds
University of Leeds
Spain, Toledo
Laboratorio de Ciencias de la Atmósfera y el Clima Ciac - Csic
Oetjen, Hilke
United Kingdom, Leeds
University of Leeds
United States, Boulder
University of Colorado Boulder
Ingham, Trevor
United Kingdom, Leeds
University of Leeds
Stone, Daniel J.
United Kingdom, Leeds
University of Leeds
Whalley, Lisa K.
United Kingdom, Leeds
University of Leeds
Evans, Mathew J.
United Kingdom, Leeds
University of Leeds
United Kingdom, York
University of York
Michael J. Pilling, Michael J.
United Kingdom, Leeds
University of Leeds
Roland J. Leigh, Roland
United Kingdom, Leicester
University of Leicester
Monks, Paul Steven
United Kingdom, Leicester
University of Leicester
Karunaharan, A.
United Kingdom, Leicester
University of Leicester
Vaughan, Stewart
United Kingdom, Leeds
University of Leeds
Arnold, Steve R.
United Kingdom, Leeds
University of Leeds
Tschritter, Jens
Germany, Heidelberg
Universität Heidelberg
Pöhler, Denis
Germany, Heidelberg
Universität Heidelberg
FrieÃ, U.
Germany, Heidelberg
Universität Heidelberg
Holla, Robert
Germany, Heidelberg
Universität Heidelberg
Mendes, Luis M.
Cape Verde, Ilha do Sal
Instituto Nacional de Metereologia e Geofisica Ilha do Sal
Lopez, Hosmay
Cape Verde, Ilha do Sal
Instituto Nacional de Metereologia e Geofisica Ilha do Sal
Faria, B.
Cape Verde, Ilha do Sal
Instituto Nacional de Metereologia e Geofisica Ilha do Sal
Manning, Alistair J.
United Kingdom, Exeter
Met Office
Wallace, Douglas W.R.
Germany, Kiel
Geomar - Helmholtz-zentrum Für Ozeanforschung Kiel
Statistics
Citations: 115
Authors: 45
Affiliations: 13
Identifiers
Doi:
10.1007/s10874-011-9206-1
ISSN:
01677764
e-ISSN:
15730662
Research Areas
Environmental
Study Locations
Cabo Verde