A 2000 year atmospheric history of methyl chloride from a South Pole ice core: Evidence for climate-controlled variability

Details A 2000 year atmospheric history of methyl chloride from a South Pole ice core: Evidence for climate-controlled variability A 2000 year atmospheric history of methyl chloride from a South Pole ice core: Evidence for climate-controlled variability

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3407811w&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 7, CiteID L07811

Physics

6

Atmospheric Composition And Structure: Constituent Sources And Sinks, Cryosphere: Ice Cores (4932), Global Change: Atmosphere (0315, 0325), Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513)

Scientific paper

Methyl chloride (CH3Cl) is a naturally occurring ozone-depleting gas with a complex biogeochemical cycle involving tropical vegetation, soils, biomass burning and the oceans. This study presents CH3Cl measurements in air extracted from a 300 m ice core from South Pole, Antarctica, covering the time period from 160 BC to 1860 AD. The data exhibit an increasing trend of 3 ppt (parts per trillion) over 100 years and higher frequency variations that appear to be climate-related. CH3Cl levels were elevated from 900-1300 AD by about 50 ppt relative to the previous 1000 years, coincident with the warm Medieval Climate Anomaly (MCA). CH3Cl levels decreased to a minimum during the Little Ice Age cooling (1650-1800 AD), before rising again to the modern atmospheric level of 550 ppt. These variations most likely reflect changes in tropical and subtropical conditions, and raise the possibility that a warmer future climate may result in higher tropospheric CH3Cl levels.

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