Deuterium Excess in a Deep Greenland Ice Core: A proxy for Arctic Sea Ice Concentration
Rising ocean temperatures over the last several decades have led to an accelerated rate of sea ice decline in the northern latitudes. This study is motivated by a need to accurately model and predict sea ice dynamics in a rapidly changing climate. This study uses isotope data from the Renland ice co...
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ftcarletoncoll:oai:digitalcommons.carleton.edu:comps-1938 2024-02-11T10:00:46+01:00 Deuterium Excess in a Deep Greenland Ice Core: A proxy for Arctic Sea Ice Concentration McGehee, Rebecca 2017-01-01T08:00:00Z application/pdf https://digitalcommons.carleton.edu/comps/939 unknown Carleton Digital Commons https://digitalcommons.carleton.edu/comps/939 Integrated Comprehensive Exercises (Comps) Deuterium excess sea ice Renland ice core climate change linear regression paleoclimate reconstruction text 2017 ftcarletoncoll 2024-01-22T19:17:50Z Rising ocean temperatures over the last several decades have led to an accelerated rate of sea ice decline in the northern latitudes. This study is motivated by a need to accurately model and predict sea ice dynamics in a rapidly changing climate. This study uses isotope data from the Renland ice core on the east coast of Greenland to identify the isotopic parameter deuterium excess (d-excess) as a proxy for Arctic sea ice concentration. A high d-excess signal is preserved during years with less sea ice, because a larger area of open ocean leads to increased local evaporation and kinetic fractionation of isotopes. A low d-excess signal is preserved during years with more sea ice, as a smaller area of open ocean decreases kinetic fractionation and shifts the origin of moisture towards the subtropics. Due to the strong influence that the origin of moisture has on the d-excess signal, I suggest using summer d-excess data to study changes in Arctic sea ice concentration. The greater variability seen in summer sea ice concentration leaves a stronger signal in the d-excess record and will make paleo-reconstructions more accurate. The identification of d-excess as a proxy for sea ice is the next step in constraining the spatial and temporal scale of abrupt climate change, and is vital to predicting the impact of anthropogenic climate change. Text Arctic Climate change Greenland Greenland ice core ice core Sea ice Carleton College: Digital Commons Arctic Greenland Renland ENVELOPE(-26.750,-26.750,71.200,71.200) |
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Carleton College: Digital Commons |
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Deuterium excess sea ice Renland ice core climate change linear regression paleoclimate reconstruction |
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Deuterium excess sea ice Renland ice core climate change linear regression paleoclimate reconstruction McGehee, Rebecca Deuterium Excess in a Deep Greenland Ice Core: A proxy for Arctic Sea Ice Concentration |
topic_facet |
Deuterium excess sea ice Renland ice core climate change linear regression paleoclimate reconstruction |
description |
Rising ocean temperatures over the last several decades have led to an accelerated rate of sea ice decline in the northern latitudes. This study is motivated by a need to accurately model and predict sea ice dynamics in a rapidly changing climate. This study uses isotope data from the Renland ice core on the east coast of Greenland to identify the isotopic parameter deuterium excess (d-excess) as a proxy for Arctic sea ice concentration. A high d-excess signal is preserved during years with less sea ice, because a larger area of open ocean leads to increased local evaporation and kinetic fractionation of isotopes. A low d-excess signal is preserved during years with more sea ice, as a smaller area of open ocean decreases kinetic fractionation and shifts the origin of moisture towards the subtropics. Due to the strong influence that the origin of moisture has on the d-excess signal, I suggest using summer d-excess data to study changes in Arctic sea ice concentration. The greater variability seen in summer sea ice concentration leaves a stronger signal in the d-excess record and will make paleo-reconstructions more accurate. The identification of d-excess as a proxy for sea ice is the next step in constraining the spatial and temporal scale of abrupt climate change, and is vital to predicting the impact of anthropogenic climate change. |
format |
Text |
author |
McGehee, Rebecca |
author_facet |
McGehee, Rebecca |
author_sort |
McGehee, Rebecca |
title |
Deuterium Excess in a Deep Greenland Ice Core: A proxy for Arctic Sea Ice Concentration |
title_short |
Deuterium Excess in a Deep Greenland Ice Core: A proxy for Arctic Sea Ice Concentration |
title_full |
Deuterium Excess in a Deep Greenland Ice Core: A proxy for Arctic Sea Ice Concentration |
title_fullStr |
Deuterium Excess in a Deep Greenland Ice Core: A proxy for Arctic Sea Ice Concentration |
title_full_unstemmed |
Deuterium Excess in a Deep Greenland Ice Core: A proxy for Arctic Sea Ice Concentration |
title_sort |
deuterium excess in a deep greenland ice core: a proxy for arctic sea ice concentration |
publisher |
Carleton Digital Commons |
publishDate |
2017 |
url |
https://digitalcommons.carleton.edu/comps/939 |
long_lat |
ENVELOPE(-26.750,-26.750,71.200,71.200) |
geographic |
Arctic Greenland Renland |
geographic_facet |
Arctic Greenland Renland |
genre |
Arctic Climate change Greenland Greenland ice core ice core Sea ice |
genre_facet |
Arctic Climate change Greenland Greenland ice core ice core Sea ice |
op_source |
Integrated Comprehensive Exercises (Comps) |
op_relation |
https://digitalcommons.carleton.edu/comps/939 |
_version_ |
1790596482149122048 |