Pollution-enhanced reactive chlorine chemistry in the eastern tropical Atlantic boundary layer

Lawler, MJ, Finley, BD, Keene, WC, Pszenny, AAP, Read, KA, von Glasow, R and Saltzman, ES (2009) Pollution-enhanced reactive chlorine chemistry in the eastern tropical Atlantic boundary layer. Geophysical Research Letters, 36 (8). ISSN 1944-8007

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Abstract

[1] This study examines atmospheric reactive chlorine chemistry at the Cape Verde Atmospheric Observatory in the eastern tropical Atlantic. During May-June, 2007, Cl2levels ranged from below detection (~2 ppt) to 30 ppt. Elevated Cl2 was associated with high HNO3 (40 to 120 ppt) in polluted continental outflow transported in the marine boundary layer (MBL) to the site. Lower Cl2 was observed in recently subsided air masses with multiday free tropospheric oceanic trajectories and in air containing Saharan dust. Model simulations show that the observations of elevated Cl2 in polluted marine air are consistent with initiation of Cl chemistry by OH + HC1 and subsequent heterogeneous, autocatalytic Cl cycling involving marine aerosols. Model estimates suggest that Cl atom reactions significantly impact the fates of methane and dimethylsulfide at Cape Verde and are moderately important for ozone cycling.

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
Depositing User: Rosie Cullington
Date Deposited: 23 Feb 2011 10:23
Last Modified: 24 Jul 2019 14:39
URI: https://ueaeprints.uea.ac.uk/id/eprint/24438
DOI: 10.1029/2008GL036666

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