title: Chloride methylation by plant pectin: an efficient environmentally significant process.
abstract: Atmospheric chloromethane (CH3Cl) plays an important role in stratospheric ozone destruction, but many uncertainties exist regarding the strengths of its sources and sinks and particularly regarding the processes generating this naturally occurring gas. Evidence is presented here that CH3Cl is produced in many terrestrial environments by a common mechanism. Abiotic conversion of chloride to CH3Cl occurs readily in plant material, with the widespread plant component pectin acting as a methyl donor. Significant CH3Cl emissions from senescent and dead leaves were observed at ambient temperatures; those emissions rose dramatically when temperatures increased. This ubiquitous process acting in terrestrial ecosystems and during biomass burning could contribute the bulk of atmospheric CH3Cl.
authors.affiliation: Department of Agriculture and Rural Development for Northern Ireland, Newforge Lane, Belfast BT9 5PX, UK. jack.hamilton@dardni.gov.uk
authors.forename: John T G
authors.initials: JT
authors.lastname: Hamilton
authors.forename: W Colin
authors.initials: WC
authors.lastname: McRoberts
authors.forename: Frank
authors.initials: F
authors.lastname: Keppler
authors.forename: Robert M
authors.initials: RM
authors.lastname: Kalin
authors.forename: David B
authors.initials: DB
authors.lastname: Harper
mesh_terms: D001272:Atmosphere; D018533:Biomass; D002712:Chlorides / Q000737:chemistry*; D017753:Ecosystem; D008737:Methyl Chloride / Q000737:chemistry*; D008745:Methylation; D010368:Pectins / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry*; D006109:Poaceae / Q000737:chemistry; D013696:Temperature; D014835:Volatilization; D014867:Water / Q000032:analysis; D014934:Wood
chemical_list: D002712:Chlorides; D014867:Water; D010368:Pectins; D008737:Methyl Chloride