English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Atmospheric chloromethane (CH3Cl) plays an important role instratospheric ozone destruction, but many uncertainties still existregarding strengths of both sources and sinks and the processes leading toformation of this naturally occurring gas. Recent work has identified anovel chemical origin for CH3Cl, which can explain its production in avariety of terrestrial environments: the widespread structural component ofplants, pectin, reacts readily with chloride ion to form CH3Cl at bothambient and elevated temperatures (Hamilton et al., 2003). It has beenproposed that this abiotic chloride methylation process in terrestrialenvironments could be responsible for formation of a large proportion ofatmospheric CH3Cl. However, more information is required to determinethe global importance of this new source and its contribution to theatmospheric CH3Cl budget.A potentially powerful tool in studying the atmospheric CH3Cl budget isthe use of stable carbon isotope ratios. In an accompanying paper it isreported that the reaction of CH3Cl with OH radical, the dominant sinkfor atmospheric CH3Cl, is accompanied by an unexpectedly largefractionation factor (Gola et al., 2005). Another recently published studyshows that CH3Cl formed by the abiotic methylation process at ambienttemperatures has a unique stable carbon isotope signature, extremelydepleted in 13C, unequivocally distinguishing it from all other knownsources (Keppler et al., 2004). Using these findings together with dataexisting in the literature, we here present three scenarios for an isotopicmass balance for atmospheric CH3Cl. Our calculations provide strongsupport for the proposal that the largest source of atmospheric CH3Cl(1800 to 2500 Gg yr-1) is the abiotic methylation of chloride interrestrial ecosytems, primarily located in tropical and subtropical areaswhere turnover of biomass is highest. Furthermore our calculations alsoindicate that the microbial soil sink for CH3Cl is likely to be muchlarger (>1000 Gg yr-1) than that previously assumed

New insight into the atmospheric chloromethane budget gained using stable carbon isotope ratios