Carbonyl sulfide hydrolysis in antarctic ice cores and an atmospheric history for the last 8000 years
Carbonyl sulfide (COS) was measured in Antarctic ice core samples from the Byrd, Siple Dome, Taylor Dome, and West Antarctic Ice Sheet Divide sites covering the last 8000 years of the Holocene. COS levels decrease downcore in most of these ice cores. The magnitude of the downcore trends varies among...
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ftcdlib:oai:escholarship.org/ark:/13030/qt6kn3w9qr 2023-05-15T14:02:59+02:00 Carbonyl sulfide hydrolysis in antarctic ice cores and an atmospheric history for the last 8000 years Aydin, M Fudge, TJ Verhulst, KR Nicewonger, MR Waddington, ED Saltzman, ES 8500 - 8514 2014-07-16 application/pdf https://escholarship.org/uc/item/6kn3w9qr unknown eScholarship, University of California qt6kn3w9qr https://escholarship.org/uc/item/6kn3w9qr CC-BY CC-BY Journal of Geophysical Research, vol 119, iss 13 Meteorology & Atmospheric Sciences article 2014 ftcdlib 2021-06-20T14:23:24Z Carbonyl sulfide (COS) was measured in Antarctic ice core samples from the Byrd, Siple Dome, Taylor Dome, and West Antarctic Ice Sheet Divide sites covering the last 8000 years of the Holocene. COS levels decrease downcore in most of these ice cores. The magnitude of the downcore trends varies among the different ice cores and is related to the thermal histories of the ice sheet at each site. We hypothesize that this is due to the temperature-dependent hydrolysis of COS that occurs in situ. We use a one-dimensional ice flow and heat flux model to infer temperature histories for the ice core samples from different sites and empirically determine the kinetic parameters for COS hydrolysis. We estimate e-folding lifetimes for COS hydrolysis ranging from 102 years to 106 years over a temperature range of 0°C to - 50°C. The reaction kinetics are used to estimate and correct for the in situ COS loss, allowing us to reconstruct paleoatmospheric COS trends during the mid-to-late Holocene. The results suggest a slow, long-term increase in atmospheric COS that may have started as early as 5000 years ago. Given that the largest term in the COS budget is uptake by terrestrial plants, this could indicate a decline in terrestrial productivity during the late Holocene. Article in Journal/Newspaper Antarc* Antarctic ice core Ice Sheet University of California: eScholarship Antarctic Byrd Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) Siple Dome ENVELOPE(-148.833,-148.833,-81.667,-81.667) Taylor Dome ENVELOPE(157.667,157.667,-77.667,-77.667) West Antarctic Ice Sheet |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Meteorology & Atmospheric Sciences |
spellingShingle |
Meteorology & Atmospheric Sciences Aydin, M Fudge, TJ Verhulst, KR Nicewonger, MR Waddington, ED Saltzman, ES Carbonyl sulfide hydrolysis in antarctic ice cores and an atmospheric history for the last 8000 years |
topic_facet |
Meteorology & Atmospheric Sciences |
description |
Carbonyl sulfide (COS) was measured in Antarctic ice core samples from the Byrd, Siple Dome, Taylor Dome, and West Antarctic Ice Sheet Divide sites covering the last 8000 years of the Holocene. COS levels decrease downcore in most of these ice cores. The magnitude of the downcore trends varies among the different ice cores and is related to the thermal histories of the ice sheet at each site. We hypothesize that this is due to the temperature-dependent hydrolysis of COS that occurs in situ. We use a one-dimensional ice flow and heat flux model to infer temperature histories for the ice core samples from different sites and empirically determine the kinetic parameters for COS hydrolysis. We estimate e-folding lifetimes for COS hydrolysis ranging from 102 years to 106 years over a temperature range of 0°C to - 50°C. The reaction kinetics are used to estimate and correct for the in situ COS loss, allowing us to reconstruct paleoatmospheric COS trends during the mid-to-late Holocene. The results suggest a slow, long-term increase in atmospheric COS that may have started as early as 5000 years ago. Given that the largest term in the COS budget is uptake by terrestrial plants, this could indicate a decline in terrestrial productivity during the late Holocene. |
format |
Article in Journal/Newspaper |
author |
Aydin, M Fudge, TJ Verhulst, KR Nicewonger, MR Waddington, ED Saltzman, ES |
author_facet |
Aydin, M Fudge, TJ Verhulst, KR Nicewonger, MR Waddington, ED Saltzman, ES |
author_sort |
Aydin, M |
title |
Carbonyl sulfide hydrolysis in antarctic ice cores and an atmospheric history for the last 8000 years |
title_short |
Carbonyl sulfide hydrolysis in antarctic ice cores and an atmospheric history for the last 8000 years |
title_full |
Carbonyl sulfide hydrolysis in antarctic ice cores and an atmospheric history for the last 8000 years |
title_fullStr |
Carbonyl sulfide hydrolysis in antarctic ice cores and an atmospheric history for the last 8000 years |
title_full_unstemmed |
Carbonyl sulfide hydrolysis in antarctic ice cores and an atmospheric history for the last 8000 years |
title_sort |
carbonyl sulfide hydrolysis in antarctic ice cores and an atmospheric history for the last 8000 years |
publisher |
eScholarship, University of California |
publishDate |
2014 |
url |
https://escholarship.org/uc/item/6kn3w9qr |
op_coverage |
8500 - 8514 |
long_lat |
ENVELOPE(-83.917,-83.917,-75.917,-75.917) ENVELOPE(-148.833,-148.833,-81.667,-81.667) ENVELOPE(157.667,157.667,-77.667,-77.667) |
geographic |
Antarctic Byrd Siple Siple Dome Taylor Dome West Antarctic Ice Sheet |
geographic_facet |
Antarctic Byrd Siple Siple Dome Taylor Dome West Antarctic Ice Sheet |
genre |
Antarc* Antarctic ice core Ice Sheet |
genre_facet |
Antarc* Antarctic ice core Ice Sheet |
op_source |
Journal of Geophysical Research, vol 119, iss 13 |
op_relation |
qt6kn3w9qr https://escholarship.org/uc/item/6kn3w9qr |
op_rights |
CC-BY |
op_rightsnorm |
CC-BY |
_version_ |
1766273432684593152 |