2009
DOI: 10.1029/2008gl036266
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Methyl chloride in a deep ice core from Siple Dome, Antarctica

Abstract: Methyl chloride (CH3Cl) is a naturally occurring ozone‐depleting substance and a significant component of the atmospheric chlorine burden. In this study CH3Cl was analyzed in air bubbles from the West Antarctic Siple Dome deep ice core with gas ages ranging from about 65 kyr BP to the Late Holocene. CH3Cl levels were below the modern Antarctic atmospheric level of 530 ppt in glacial ice (456 ± 46 ppt, 33–65 kyr BP) and above it during the early Holocene (650–700 ppt, 10–11 kyr BP). For most of the Holocene, CH… Show more

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Cited by 14 publications
(14 citation statements)
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“…This simple mechanism of glacial formation was described in the 1990s [1], and has been presented as a justification to use greenhouse gases (CO 2 , CH 4 ) entrapped in glacial ice as a proxy for atmospheric compositions (and hence, climate conditions) back in time. This same logic has been used to justify the quantification of shorter-lived, more reactive trace gases in ice cores including methyl bromide [2] and methyl chloride [3,4]. However, these methods rest on the assumption that the snowpack is quasi-sterile metabolically or, at least, that microbial production/consumption of these trace gases is not significant.…”
Section: Introductionmentioning
confidence: 99%
“…This simple mechanism of glacial formation was described in the 1990s [1], and has been presented as a justification to use greenhouse gases (CO 2 , CH 4 ) entrapped in glacial ice as a proxy for atmospheric compositions (and hence, climate conditions) back in time. This same logic has been used to justify the quantification of shorter-lived, more reactive trace gases in ice cores including methyl bromide [2] and methyl chloride [3,4]. However, these methods rest on the assumption that the snowpack is quasi-sterile metabolically or, at least, that microbial production/consumption of these trace gases is not significant.…”
Section: Introductionmentioning
confidence: 99%
“…Sample air was analyzed by gas chromatography with high‐resolution mass spectrometry using an internal isotope‐labeled gas standard calibrated against ppm‐level primary gas standards. The apparatus and procedures used to extract and analyze gases from the ice core samples were similar to those used in earlier studies [ Saltzman et al , ; Aydin et al , ; Saltzman et al , ]. A correction of approximately −1% was applied to the measured CH 3 Cl mixing ratios to account for gravitational enrichment in firn air, based on a bubble lock‐in depth of 66 m and a mean annual surface air temperature of −42.5°C [ Craig et al , ].…”
Section: Ice Core Sampling Analysis and Datingmentioning
confidence: 99%
“…There is no correlation between Ca 2+ and CH 3 Cl in the Taylor Dome samples, suggesting there is no in situ production of methyl chloride (see Figure S2). In Siple Dome ice, there is evidence of “excess CH 3 Cl” in samples with Ca 2+ above 0.25 μM [ Saltzman et al , ]. Five measurements from the Taylor Dome ice core have Ca 2+ at or above this level and are highlighted in Figures , , and S2.…”
Section: Ice Core Sampling Analysis and Datingmentioning
confidence: 99%
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“…to these traditional trace gases at ppm (CO 2 ) or ppb levels (CH 4 and N 2 O), CO and atmospheric trace gases at ppt level, like ethane, propane or methyl chloride, are currently being studied in firn (Aydin et al, 2011;Worton et al, 2012) and ice core studies (Saltzman et al, 2009;Wang et al, 2010;Verhulst et al, 2013). Although these ppt-level gases do not significantly influence climate via the greenhouse effect, they act indirectly, e.g.…”
Section: Introductionmentioning
confidence: 99%