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Missing methyl chloride found

Measuring halides emitted from tropical ferns could explain the observed shortfall in these ozone-depleting compounds.

David Bruce(davidb@biomedcentral.com)

Methyl chloride (CH3Cl) is one of the largest natural sources of ozone-depleting compounds — accounting for approximately 15% of the atmospheric chlorine content. But, measurements of CH3Cl emissions from coastal lands in the tropics suggest there is a significant shortfall in the observed atmospheric chloride concentrations and that emitted from plants. In 14 March Nature, Yoko Yokouchi and colleagues at the National Institute for Environmental Studies, Ibaraki, Japan show that CH3Cl emissions from some common tropical plants can make up this shortfall (Nature 2002, 416:163-165).

Yokouchi et al. examined the rate of CH3Cl emission from varieties of Dipterocarpaceae and ferns in the Tropical Rainforest Glass House at Tsukuba Botanical Gardens. They used capillary gas chromatography and mass spectrometry and measured volatile organic compound concentrations from the observation catwalk within the glasshouse (4m high) and from an...

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