Application of sediment core modelling to interpreting the glacial-interglacial record of Southern Ocean silica cycling
Sediments from the Southern Ocean reveal a meridional divide in biogeochemical cycling response to the glacial-interglacial cycles of the late Neogene. South of the present-day position of the Antarctic Polar Front in the Atlantic sector of the Southern Ocean, biogenic opal is generally much more ab...
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ftubristolcris:oai:research-information.bris.ac.uk:publications/b602df3e-d1b2-484e-88eb-80c342136cdb 2024-04-28T08:02:19+00:00 Application of sediment core modelling to interpreting the glacial-interglacial record of Southern Ocean silica cycling Ridgwell, AJ 2007-07 https://hdl.handle.net/1983/b602df3e-d1b2-484e-88eb-80c342136cdb https://research-information.bris.ac.uk/en/publications/b602df3e-d1b2-484e-88eb-80c342136cdb http://www.clim-past.net/3/387/2007/cp-3-387-2007.html eng eng https://research-information.bris.ac.uk/en/publications/b602df3e-d1b2-484e-88eb-80c342136cdb info:eu-repo/semantics/restrictedAccess Ridgwell , AJ 2007 , ' Application of sediment core modelling to interpreting the glacial-interglacial record of Southern Ocean silica cycling ' , Climate of the Past , vol. 3 (3) , pp. 387 - 396 . < http://www.clim-past.net/3/387/2007/cp-3-387-2007.html > article 2007 ftubristolcris 2024-04-03T15:04:37Z Sediments from the Southern Ocean reveal a meridional divide in biogeochemical cycling response to the glacial-interglacial cycles of the late Neogene. South of the present-day position of the Antarctic Polar Front in the Atlantic sector of the Southern Ocean, biogenic opal is generally much more abundant in sediments during interglacials compared to glacials. To the north, an anti-phased relationship is observed, with maximum opal abundance instead occurring during glacials. This antagonistic response of sedimentary properties provides an important model validation target for testing hypotheses of glacial-interglacial change against, particularly for understanding the causes of the concurrent variability in atmospheric CO2. Here, I illustrate a time-dependent modelling approach to helping understand climates of the past by means of the mechanistic simulation of marine sediment core records. I find that a close match between model-predicted and observed down-core changes in sedimentary opal content can be achieved when changes in seasonal sea-ice extent are imposed, whereas the predicted sedimentary response to iron fertilization on its own is not consistent with sedimentary observations. The results of this sediment record model-data comparison supports previous inferences that the changing cryosphere is the primary driver of the striking features exhibited by the paleoceanographic record of this region. Sediments from the Southern Ocean reveal a meridional divide in biogeochemical cycling response to the glacial-interglacial cycles of the late Neogene. South of the present-day position of the Antarctic Polar Front in the Atlantic sector of the Southern Ocean, biogenic opal is generally much more abundant in sediments during interglacials compared to glacials. To the north, an anti-phased relationship is observed, with maximum opal abundance instead occurring during glacials. This antagonistic response of sedimentary properties provides an important model validation target for testing hypotheses of ... Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean University of Bristol: Bristol Research |
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Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
description |
Sediments from the Southern Ocean reveal a meridional divide in biogeochemical cycling response to the glacial-interglacial cycles of the late Neogene. South of the present-day position of the Antarctic Polar Front in the Atlantic sector of the Southern Ocean, biogenic opal is generally much more abundant in sediments during interglacials compared to glacials. To the north, an anti-phased relationship is observed, with maximum opal abundance instead occurring during glacials. This antagonistic response of sedimentary properties provides an important model validation target for testing hypotheses of glacial-interglacial change against, particularly for understanding the causes of the concurrent variability in atmospheric CO2. Here, I illustrate a time-dependent modelling approach to helping understand climates of the past by means of the mechanistic simulation of marine sediment core records. I find that a close match between model-predicted and observed down-core changes in sedimentary opal content can be achieved when changes in seasonal sea-ice extent are imposed, whereas the predicted sedimentary response to iron fertilization on its own is not consistent with sedimentary observations. The results of this sediment record model-data comparison supports previous inferences that the changing cryosphere is the primary driver of the striking features exhibited by the paleoceanographic record of this region. Sediments from the Southern Ocean reveal a meridional divide in biogeochemical cycling response to the glacial-interglacial cycles of the late Neogene. South of the present-day position of the Antarctic Polar Front in the Atlantic sector of the Southern Ocean, biogenic opal is generally much more abundant in sediments during interglacials compared to glacials. To the north, an anti-phased relationship is observed, with maximum opal abundance instead occurring during glacials. This antagonistic response of sedimentary properties provides an important model validation target for testing hypotheses of ... |
format |
Article in Journal/Newspaper |
author |
Ridgwell, AJ |
spellingShingle |
Ridgwell, AJ Application of sediment core modelling to interpreting the glacial-interglacial record of Southern Ocean silica cycling |
author_facet |
Ridgwell, AJ |
author_sort |
Ridgwell, AJ |
title |
Application of sediment core modelling to interpreting the glacial-interglacial record of Southern Ocean silica cycling |
title_short |
Application of sediment core modelling to interpreting the glacial-interglacial record of Southern Ocean silica cycling |
title_full |
Application of sediment core modelling to interpreting the glacial-interglacial record of Southern Ocean silica cycling |
title_fullStr |
Application of sediment core modelling to interpreting the glacial-interglacial record of Southern Ocean silica cycling |
title_full_unstemmed |
Application of sediment core modelling to interpreting the glacial-interglacial record of Southern Ocean silica cycling |
title_sort |
application of sediment core modelling to interpreting the glacial-interglacial record of southern ocean silica cycling |
publishDate |
2007 |
url |
https://hdl.handle.net/1983/b602df3e-d1b2-484e-88eb-80c342136cdb https://research-information.bris.ac.uk/en/publications/b602df3e-d1b2-484e-88eb-80c342136cdb http://www.clim-past.net/3/387/2007/cp-3-387-2007.html |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_source |
Ridgwell , AJ 2007 , ' Application of sediment core modelling to interpreting the glacial-interglacial record of Southern Ocean silica cycling ' , Climate of the Past , vol. 3 (3) , pp. 387 - 396 . < http://www.clim-past.net/3/387/2007/cp-3-387-2007.html > |
op_relation |
https://research-information.bris.ac.uk/en/publications/b602df3e-d1b2-484e-88eb-80c342136cdb |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1797573708286525440 |