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Aircraft measurements of very short-lived halocarbons over the tropical Atlantic Ocean

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Publication details

JournalGeophysical Research Letters
DatePublished - 16 Mar 2013
Issue number5
Number of pages6
Pages (from-to)1005-1010
Original languageEnglish


Atmospheric mixing ratios of CHI, CH ClI, CHBr, and CHBr were quantified from whole air samples collected aboard the FAAM BAe 146-301 atmospheric research aircraft during flights over the tropical Atlantic Ocean (30°N to 10°S) as part of the Trade Wind Ozone Photochemistry Experiment (TROMPEX) in September 2009. Mixing ratios of CHI and CHClI increased with decreasing latitude, and concentrations of all measured halocarbons were elevated with increasing proximity to the oceanic upwelling along the coast of Mauritania. Vertical profiles highlighted the rapid photolytic degradation of these compounds within the tropical troposphere, with CHClI concentrations reduced by 50% at the top of the boundary layer. The spatial distributions of CHClI indicated an open ocean source.


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