Modeling the oxygen-isotopic composition of the North American Ice Sheet and its effect on the isotopic composition of the ocean during the last glacial cycle
We used a 2.5-dimensional thermomechanical icesheet model including the oxygen-isotope ratio 18O/16O as a passive tracer to simulate the isotopic composition (d18O) of the North American Ice Sheet (NAIS) during the last glacial cycle. This model allowed us to estimate the NAIS contribution to the ch...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/21389 2023-07-23T04:19:49+02:00 Modeling the oxygen-isotopic composition of the North American Ice Sheet and its effect on the isotopic composition of the ocean during the last glacial cycle Sima, A. Paul, A. Schulz, M. Oerlemans, J. Marine and Atmospheric Research Sub Dynamics Meteorology 2006 image/pdf https://dspace.library.uu.nl/handle/1874/21389 other unknown 0094-8276 https://dspace.library.uu.nl/handle/1874/21389 info:eu-repo/semantics/OpenAccess Article 2006 ftunivutrecht 2023-07-01T23:18:43Z We used a 2.5-dimensional thermomechanical icesheet model including the oxygen-isotope ratio 18O/16O as a passive tracer to simulate the isotopic composition (d18O) of the North American Ice Sheet (NAIS) during the last glacial cycle. This model allowed us to estimate the NAIS contribution to the change of seawater d18O (dw) between the Last Glacial Maximum (LGM) and the Holocene and to evaluate the effect of nonequilibrium isotopic composition of the NAIS on the relationship between ice-volume variations and the ocean isotopic enrichment. The enrichment due to the NAIS at the LGM was 0.63%, corresponding to 60% of the LGM sea-level lowstand and to a mean d18O of the NAIS of approximately 31%. The modeled NAIS volume variations and the induced dw changes over the past 120,000 years indicated no significant time lag. The inaccuracy associated with linearly inferring ice-volume variations from dw changes was generally less than 10%. Article in Journal/Newspaper Ice Sheet Utrecht University Repository |
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Utrecht University Repository |
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ftunivutrecht |
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description |
We used a 2.5-dimensional thermomechanical icesheet model including the oxygen-isotope ratio 18O/16O as a passive tracer to simulate the isotopic composition (d18O) of the North American Ice Sheet (NAIS) during the last glacial cycle. This model allowed us to estimate the NAIS contribution to the change of seawater d18O (dw) between the Last Glacial Maximum (LGM) and the Holocene and to evaluate the effect of nonequilibrium isotopic composition of the NAIS on the relationship between ice-volume variations and the ocean isotopic enrichment. The enrichment due to the NAIS at the LGM was 0.63%, corresponding to 60% of the LGM sea-level lowstand and to a mean d18O of the NAIS of approximately 31%. The modeled NAIS volume variations and the induced dw changes over the past 120,000 years indicated no significant time lag. The inaccuracy associated with linearly inferring ice-volume variations from dw changes was generally less than 10%. |
author2 |
Marine and Atmospheric Research Sub Dynamics Meteorology |
format |
Article in Journal/Newspaper |
author |
Sima, A. Paul, A. Schulz, M. Oerlemans, J. |
spellingShingle |
Sima, A. Paul, A. Schulz, M. Oerlemans, J. Modeling the oxygen-isotopic composition of the North American Ice Sheet and its effect on the isotopic composition of the ocean during the last glacial cycle |
author_facet |
Sima, A. Paul, A. Schulz, M. Oerlemans, J. |
author_sort |
Sima, A. |
title |
Modeling the oxygen-isotopic composition of the North American Ice Sheet and its effect on the isotopic composition of the ocean during the last glacial cycle |
title_short |
Modeling the oxygen-isotopic composition of the North American Ice Sheet and its effect on the isotopic composition of the ocean during the last glacial cycle |
title_full |
Modeling the oxygen-isotopic composition of the North American Ice Sheet and its effect on the isotopic composition of the ocean during the last glacial cycle |
title_fullStr |
Modeling the oxygen-isotopic composition of the North American Ice Sheet and its effect on the isotopic composition of the ocean during the last glacial cycle |
title_full_unstemmed |
Modeling the oxygen-isotopic composition of the North American Ice Sheet and its effect on the isotopic composition of the ocean during the last glacial cycle |
title_sort |
modeling the oxygen-isotopic composition of the north american ice sheet and its effect on the isotopic composition of the ocean during the last glacial cycle |
publishDate |
2006 |
url |
https://dspace.library.uu.nl/handle/1874/21389 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
0094-8276 https://dspace.library.uu.nl/handle/1874/21389 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1772183248907010048 |