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Environmental context. With large reductions in anthropogenic emissions of many ozone-depleting gases in response to the Montreal Protocol, gases with biogenic sources have become relatively more important in recent years. The global budgets of the biogenic halocarbons are unbalanced with known sinks outweighing sources, suggesting that additional natural sources are required to balance the budgets. In the present study, an investigation has been carried out to determine the importance of leaf cutter ants as a missing source of the biogenic halocarbons, which will reduce the discrepancy of the global budget of the halocarbons. Abstract. Leaf cutter ant colonies are shown to be a potentially significant new source of biogenic halocarbons. Fungus cultivated by these ant species may emit CH 3 Br, CH 3 I, CH 3 Cl, CH 2 Cl 2 and CHCl 3 in significant quantities, contributing to their respective global atmospheric budgets. The study suggests that the mixing ratios of CH 3 Br, CH 3 I, CH 3 Cl, CH 2 Cl 2 and CHCl 3 in the ant colony under test were significantly higher than background levels, by on average a factor of 1.5–5.0. Sampling was carried out during three stages of ant colony development (new, moderately active and highly active) and it was found that levels of these halocarbons were elevated during the active phases of the ant colony life cycle. A very rough estimate of the possible emission of CH 3 Br, CH 3 I, CH 3 Cl, CH 2 Cl 2 and CHCl 3 from ant colonies globally are 0.50, 0.02, 0.80, 0.15 and 0.22 Gg year –1 .
Environmental Chemistry – CSIRO Publishing
Published: Feb 22, 2008
Keywords: Adsorption Desorption System (ADS), Automated Thermal Desorber (ATD), Bristol wild walk, gas chromatography (GC), mass spectrometry (MS).
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