Application of sediment core modelling to interpreting the glacial-interglacial record of Southern Ocean silica cycling
International audience 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...
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ftccsdartic:oai:HAL:hal-00298080v1 2023-11-12T04:03:09+01:00 Application of sediment core modelling to interpreting the glacial-interglacial record of Southern Ocean silica cycling Ridgwell, A. School of Geographical Sciences Bristol University of Bristol Bristol 2007-07-10 https://hal.science/hal-00298080 https://hal.science/hal-00298080/document https://hal.science/hal-00298080/file/cp-3-387-2007.pdf en eng HAL CCSD European Geosciences Union (EGU) hal-00298080 https://hal.science/hal-00298080 https://hal.science/hal-00298080/document https://hal.science/hal-00298080/file/cp-3-387-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-00298080 Climate of the Past, 2007, 3 (3), pp.387-396 [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2007 ftccsdartic 2023-10-21T23:15:24Z International audience 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 CO 2 . 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. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Southern Ocean The Antarctic |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Ridgwell, A. Application of sediment core modelling to interpreting the glacial-interglacial record of Southern Ocean silica cycling |
topic_facet |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience 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 CO 2 . 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. |
author2 |
School of Geographical Sciences Bristol University of Bristol Bristol |
format |
Article in Journal/Newspaper |
author |
Ridgwell, A. |
author_facet |
Ridgwell, A. |
author_sort |
Ridgwell, A. |
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 |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-00298080 https://hal.science/hal-00298080/document https://hal.science/hal-00298080/file/cp-3-387-2007.pdf |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-00298080 Climate of the Past, 2007, 3 (3), pp.387-396 |
op_relation |
hal-00298080 https://hal.science/hal-00298080 https://hal.science/hal-00298080/document https://hal.science/hal-00298080/file/cp-3-387-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782336290888351744 |