Abstract
Measurements of methyl chloride (CH3Cl) in Antarctic polar ice and firn air are used to describe the variability of atmospheric CH3Cl during the past 300 years. Firn air results from South Pole and Siple Dome suggest that the atmospheric abundance of CH3Cl increased by about 10% in the 50 years prior to 1990. Ice core measurements from Siple Dome provide evidence for a cyclic natural variability on the order of 10%, with a period of about 110 years in phase with the 20th century rise inferred from firn air. Thus, the CH3Cl increase measured in firn air may largely be a result of natural processes, which may continue to affect the atmospheric CH3Cl burden during the 21st century.
Highlights
[3] In this study, we used CH3Cl measurements in ice core and firn air samples from Antarctica to describe the variabil
Firn air results from South Pole and Siple Dome suggest that the atmospheric abundance of CH3Cl increased by about 10% in the 50 years prior to 1990
[5] The firn air samples were obtained during three different Antarctic field expeditions: to South Pole in 1995 (SPO-95), to South Pole in 2001 (SPO-01), and to Siple Dome in 1996 (SDM-96) [Butler et al, 1999], using established methods [Schwander et al, 1993; Bender et al, 1994; Battle et al, 1996; Butler et al, 1999]
Summary
M., et al "Atmospheric variability of methyl chloride during the last 300 years from an Antarctic ice core and firn air." Geophysical research letters 31.2 (2004). [1] Measurements of methyl chloride (CH3Cl) in Antarctic polar ice and firn air are used to describe the variability of atmospheric CH3Cl during the past 300 years. Firn air results from South Pole and Siple Dome suggest that the atmospheric abundance of CH3Cl increased by about 10% in the 50 years prior to 1990. Ice core measurements from Siple Dome provide evidence for a cyclic natural variability on the order of 10%, with a period of about 110 years in phase with the 20th century rise inferred from firn air. Battle (2004), Atmospheric variability of methyl chloride during the last 300 years from an Antarctic ice core and firn air, Geophys.
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