Modelling ocean circulation, climate and oxygen isotopes in the ocean over the last 120 000 years
A new Earth System Model of Intermediate Complexity, GENIE-1, is used to simulate the most recent glacial-interglacial cycle by prescribing orbital forcing, atmospheric CO 2 concentration, and the time evolution of ice sheet extent and orography. A series of experiments investigates uncertainty in t...
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ftcopernicus:oai:publications.copernicus.org:cpd6223 2023-05-15T13:36:36+02:00 Modelling ocean circulation, climate and oxygen isotopes in the ocean over the last 120 000 years Marsh, R. Smith, M. P. L. M. Rohling, E. J. Lunt, D. J. Lenton, T. M. Williamson, M. S. Yool, A. 2018-09-26 application/pdf https://doi.org/10.5194/cpd-2-657-2006 https://cp.copernicus.org/preprints/cpd-2006-0041/ eng eng doi:10.5194/cpd-2-657-2006 https://cp.copernicus.org/preprints/cpd-2006-0041/ eISSN: 1814-9332 Text 2018 ftcopernicus https://doi.org/10.5194/cpd-2-657-2006 2020-07-20T16:27:14Z A new Earth System Model of Intermediate Complexity, GENIE-1, is used to simulate the most recent glacial-interglacial cycle by prescribing orbital forcing, atmospheric CO 2 concentration, and the time evolution of ice sheet extent and orography. A series of experiments investigates uncertainty in the amplitude, frequency and location of prescribed meltwater pulses (MWPs) associated with Heinrich events in the North Atlantic and layers enriched in ice rafted debris around Antarctica. Associated with each MWP is a flux into the ocean of very light glacial oxygen isotope ratios, which serve as a tracer of the melt water. Additionally accounted for are temperature-related changes in the fractionation of stable oxygen isotopes between water and calcite. Modelled forwards from 120 000 years ago, simulated oxygen isotope records can thus be directly compared with measurements in calcite taken from International Marine Global Change Study (IMAGES) and Ocean Drilling Program (ODP) sediment cores at three locations representative of the North and South Atlantic, and the South Pacific. During the period of simulation corresponding to Marine Isotope Stage 3, the best agreement between the simulated oxygen isotope record in the North Atlantic and core measurements is found in the experiment that includes MWPs around Antarctica as well as into the North Atlantic. This challenges previous assumptions about the dominant role of northern ice sheets in glacial sea-level variability. Text Antarc* Antarctica Ice Sheet North Atlantic Copernicus Publications: E-Journals Pacific |
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A new Earth System Model of Intermediate Complexity, GENIE-1, is used to simulate the most recent glacial-interglacial cycle by prescribing orbital forcing, atmospheric CO 2 concentration, and the time evolution of ice sheet extent and orography. A series of experiments investigates uncertainty in the amplitude, frequency and location of prescribed meltwater pulses (MWPs) associated with Heinrich events in the North Atlantic and layers enriched in ice rafted debris around Antarctica. Associated with each MWP is a flux into the ocean of very light glacial oxygen isotope ratios, which serve as a tracer of the melt water. Additionally accounted for are temperature-related changes in the fractionation of stable oxygen isotopes between water and calcite. Modelled forwards from 120 000 years ago, simulated oxygen isotope records can thus be directly compared with measurements in calcite taken from International Marine Global Change Study (IMAGES) and Ocean Drilling Program (ODP) sediment cores at three locations representative of the North and South Atlantic, and the South Pacific. During the period of simulation corresponding to Marine Isotope Stage 3, the best agreement between the simulated oxygen isotope record in the North Atlantic and core measurements is found in the experiment that includes MWPs around Antarctica as well as into the North Atlantic. This challenges previous assumptions about the dominant role of northern ice sheets in glacial sea-level variability. |
format |
Text |
author |
Marsh, R. Smith, M. P. L. M. Rohling, E. J. Lunt, D. J. Lenton, T. M. Williamson, M. S. Yool, A. |
spellingShingle |
Marsh, R. Smith, M. P. L. M. Rohling, E. J. Lunt, D. J. Lenton, T. M. Williamson, M. S. Yool, A. Modelling ocean circulation, climate and oxygen isotopes in the ocean over the last 120 000 years |
author_facet |
Marsh, R. Smith, M. P. L. M. Rohling, E. J. Lunt, D. J. Lenton, T. M. Williamson, M. S. Yool, A. |
author_sort |
Marsh, R. |
title |
Modelling ocean circulation, climate and oxygen isotopes in the ocean over the last 120 000 years |
title_short |
Modelling ocean circulation, climate and oxygen isotopes in the ocean over the last 120 000 years |
title_full |
Modelling ocean circulation, climate and oxygen isotopes in the ocean over the last 120 000 years |
title_fullStr |
Modelling ocean circulation, climate and oxygen isotopes in the ocean over the last 120 000 years |
title_full_unstemmed |
Modelling ocean circulation, climate and oxygen isotopes in the ocean over the last 120 000 years |
title_sort |
modelling ocean circulation, climate and oxygen isotopes in the ocean over the last 120 000 years |
publishDate |
2018 |
url |
https://doi.org/10.5194/cpd-2-657-2006 https://cp.copernicus.org/preprints/cpd-2006-0041/ |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Antarc* Antarctica Ice Sheet North Atlantic |
genre_facet |
Antarc* Antarctica Ice Sheet North Atlantic |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cpd-2-657-2006 https://cp.copernicus.org/preprints/cpd-2006-0041/ |
op_doi |
https://doi.org/10.5194/cpd-2-657-2006 |
_version_ |
1766081534097358848 |