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dc.contributor.authorVento, Sabino del-
dc.contributor.authorDachs, Jordi-
dc.identifier.citationEnvironmental Science & Technology 41(16): 5608-5613 (2007)en_US
dc.description6 pages, 3 figures.-- PMID: 17874762 [PubMed].-- Printed version published on Aug 15, 2007.en_US
dc.descriptionSupplementary information (Annexes I-VI, 4 figures, 2 tables, 10 pages) available at: http://pubs.acs.org/doi/suppl/10.1021/es0707660/suppl_file/es0707660si20070531_014549.pdf-
dc.description.abstractAtmospheric transport and deposition of polycyclic aromatic hydrocarbons (PAHs) over tropical oceans has not yet been studied even though tropical oceans account for 35% of the global oceans. Here we show the results from measurements of gas- and aerosol-phase PAHs and dry deposition samples in the NE tropical Atlantic Ocean atmosphere, a region between 26° and 21° N, off shore of the Saharan desert. The results show that PAHs concentrations are high at the coastal ocean (15-20 ng m-3 for sum of 27 gas-phase individual PAHs) and decrease by a factor of 2-3 at open ocean (26° W). The spatial variability observed is consistent with dilution, reaction, and deposition during transport. Atmospheric dry deposition velocities ranged between 0.1 and 0.3 cm s-1 with higher deposition velocities for the more volatile PAHs. Outbreaks of Saharan Dust significantly increase the deposition rates of PAHs. The occurrence and deposition of PAHs in tropical regions is complex and results from the interplay of a number of processes, such as wind speed, aerosol loads, important sources from West Africa, processes controlling the diurnal variability, and sequestration driven by high primary productivity regions. The measured average atmospheric residence times of gas- and aerosolphase PAHs are 3.7 and 3.5 days, respectively.en_US
dc.description.sponsorshipWe gratefully acknowledge the NOAA Air Resources Laboratory (ARL) for the provision of the HYSPLIT transport and dispersion model and/or READY website (http://www.arl-noaa.gov/ready.html) used in this publication. S.D.V. acknowledges Ph.D. fellowship from the Catalan Government. This research is part of DEPOCEC projects, founded by the Spanish Ministry of Education and Science. S. Agustí is acknowledged for leading the COCA cruise.en_US
dc.format.extent19968 bytes-
dc.publisherAmerican Chemical Societyen_US
dc.subjectAtmospheric transporten_US
dc.subjectPolycyclic aromatic hydrocarbons (PAHs)en_US
dc.subjectWind speeden_US
dc.subjectAerosol loadsen_US
dc.titleAtmospheric occurrence and deposition of polycyclic aromatic hydrocarbons in the northeast tropical and subtropical Atlantic Oceanen_US
dc.description.peerreviewedPeer revieweden_US
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