Feasibility of reconstructing paleoatmospheric records of selected alkanes, methyl halides, and sulfur gases from Greenland ice cores
Seven short-lived atmospheric trace gases were measured in 25 ice core samples from Summit, Greenland. Samples were selected from contemporaneous sections of fluid- and dry-drilled ice cores to examine what effects using n-butyl acetate as the drill fluid would have on the measurements. The gases in...
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ftcdlib:qt9wz0z76j 2023-05-15T13:54:07+02:00 Feasibility of reconstructing paleoatmospheric records of selected alkanes, methyl halides, and sulfur gases from Greenland ice cores Aydin, M. Williams, M. B Saltzman, E. S 2007-04-16 application/pdf http://www.escholarship.org/uc/item/9wz0z76j english eng eScholarship, University of California qt9wz0z76j http://www.escholarship.org/uc/item/9wz0z76j Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ CC-BY Aydin, M.; Williams, M. B; & Saltzman, E. S. (2007). Feasibility of reconstructing paleoatmospheric records of selected alkanes, methyl halides, and sulfur gases from Greenland ice cores. Journal of Geophysical Research, 112(D7). doi:10.1029/2006JD008027. UC Irvine: Department of Earth System Science, UCI. Retrieved from: http://www.escholarship.org/uc/item/9wz0z76j Physical Sciences and Mathematics biogeochemistry dichloromethane global warming ice troposphere biomass burning climate-controlled variability little ice age cooling medieval climate anomaly tropical vegetation climatology climate variation cooling ice core little ice age methyl chloride Antarctica East Antarctica South Pole article 2007 ftcdlib https://doi.org/10.1029/2006JD008027 2016-04-02T18:37:50Z Seven short-lived atmospheric trace gases were measured in 25 ice core samples from Summit, Greenland. Samples were selected from contemporaneous sections of fluid- and dry-drilled ice cores to examine what effects using n-butyl acetate as the drill fluid would have on the measurements. The gases include three light alkanes, C2H6, C3H6, and n-C4H10; two methyl halides, CH3Cl and CH3Br; and two sulfur compounds, OCS and CS2, with gas ages from 125 to 325 years before present. Alkane levels are comparable to measurements in modern Arctic air, although C2H6 exhibits greater variability than expected compared with C3H6 and n-C4H10. These results are not consistent with the idea that the alkanes are primarily of anthropogenic origin, suggesting that the ice cores may not truly record a paleoatmospheric signal with respect to these gases. The CH3Br results are consistent with previous observations of “excess” CH3Br in Greenland firn air. In situ production processes appear to overwhelm the paleoatmospheric signal of this gas. CH3Cl exhibits the same effect to a lesser extent. OCS levels are similar to those in Antarctic ice cores and appear to reflect paleoatmospheric levels. CS2 results are similar to the limited database of modern atmospheric measurements. Only C3H8 and n-C4H10 exhibit clear evidence of contamination because of the presence of the drill fluid. The results indicate that it is possible to analyze many trace gases in fluid- and dry-drilled ice samples. However, it appears that in situ production may significantly alter the levels of some trace gases in Greenland ice cores. Article in Journal/Newspaper Antarc* Antarctic Antarctica Arctic East Antarctica Global warming Greenland Greenland ice cores ice core South pole South pole University of California: eScholarship Antarctic Arctic East Antarctica Greenland South Pole Journal of Geophysical Research 112 D7 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
topic |
Physical Sciences and Mathematics biogeochemistry dichloromethane global warming ice troposphere biomass burning climate-controlled variability little ice age cooling medieval climate anomaly tropical vegetation climatology climate variation cooling ice core little ice age methyl chloride Antarctica East Antarctica South Pole |
spellingShingle |
Physical Sciences and Mathematics biogeochemistry dichloromethane global warming ice troposphere biomass burning climate-controlled variability little ice age cooling medieval climate anomaly tropical vegetation climatology climate variation cooling ice core little ice age methyl chloride Antarctica East Antarctica South Pole Aydin, M. Williams, M. B Saltzman, E. S Feasibility of reconstructing paleoatmospheric records of selected alkanes, methyl halides, and sulfur gases from Greenland ice cores |
topic_facet |
Physical Sciences and Mathematics biogeochemistry dichloromethane global warming ice troposphere biomass burning climate-controlled variability little ice age cooling medieval climate anomaly tropical vegetation climatology climate variation cooling ice core little ice age methyl chloride Antarctica East Antarctica South Pole |
description |
Seven short-lived atmospheric trace gases were measured in 25 ice core samples from Summit, Greenland. Samples were selected from contemporaneous sections of fluid- and dry-drilled ice cores to examine what effects using n-butyl acetate as the drill fluid would have on the measurements. The gases include three light alkanes, C2H6, C3H6, and n-C4H10; two methyl halides, CH3Cl and CH3Br; and two sulfur compounds, OCS and CS2, with gas ages from 125 to 325 years before present. Alkane levels are comparable to measurements in modern Arctic air, although C2H6 exhibits greater variability than expected compared with C3H6 and n-C4H10. These results are not consistent with the idea that the alkanes are primarily of anthropogenic origin, suggesting that the ice cores may not truly record a paleoatmospheric signal with respect to these gases. The CH3Br results are consistent with previous observations of “excess” CH3Br in Greenland firn air. In situ production processes appear to overwhelm the paleoatmospheric signal of this gas. CH3Cl exhibits the same effect to a lesser extent. OCS levels are similar to those in Antarctic ice cores and appear to reflect paleoatmospheric levels. CS2 results are similar to the limited database of modern atmospheric measurements. Only C3H8 and n-C4H10 exhibit clear evidence of contamination because of the presence of the drill fluid. The results indicate that it is possible to analyze many trace gases in fluid- and dry-drilled ice samples. However, it appears that in situ production may significantly alter the levels of some trace gases in Greenland ice cores. |
format |
Article in Journal/Newspaper |
author |
Aydin, M. Williams, M. B Saltzman, E. S |
author_facet |
Aydin, M. Williams, M. B Saltzman, E. S |
author_sort |
Aydin, M. |
title |
Feasibility of reconstructing paleoatmospheric records of selected alkanes, methyl halides, and sulfur gases from Greenland ice cores |
title_short |
Feasibility of reconstructing paleoatmospheric records of selected alkanes, methyl halides, and sulfur gases from Greenland ice cores |
title_full |
Feasibility of reconstructing paleoatmospheric records of selected alkanes, methyl halides, and sulfur gases from Greenland ice cores |
title_fullStr |
Feasibility of reconstructing paleoatmospheric records of selected alkanes, methyl halides, and sulfur gases from Greenland ice cores |
title_full_unstemmed |
Feasibility of reconstructing paleoatmospheric records of selected alkanes, methyl halides, and sulfur gases from Greenland ice cores |
title_sort |
feasibility of reconstructing paleoatmospheric records of selected alkanes, methyl halides, and sulfur gases from greenland ice cores |
publisher |
eScholarship, University of California |
publishDate |
2007 |
url |
http://www.escholarship.org/uc/item/9wz0z76j |
geographic |
Antarctic Arctic East Antarctica Greenland South Pole |
geographic_facet |
Antarctic Arctic East Antarctica Greenland South Pole |
genre |
Antarc* Antarctic Antarctica Arctic East Antarctica Global warming Greenland Greenland ice cores ice core South pole South pole |
genre_facet |
Antarc* Antarctic Antarctica Arctic East Antarctica Global warming Greenland Greenland ice cores ice core South pole South pole |
op_source |
Aydin, M.; Williams, M. B; & Saltzman, E. S. (2007). Feasibility of reconstructing paleoatmospheric records of selected alkanes, methyl halides, and sulfur gases from Greenland ice cores. Journal of Geophysical Research, 112(D7). doi:10.1029/2006JD008027. UC Irvine: Department of Earth System Science, UCI. Retrieved from: http://www.escholarship.org/uc/item/9wz0z76j |
op_relation |
qt9wz0z76j http://www.escholarship.org/uc/item/9wz0z76j |
op_rights |
Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2006JD008027 |
container_title |
Journal of Geophysical Research |
container_volume |
112 |
container_issue |
D7 |
_version_ |
1766259772751872000 |