Paleoproductivity during the middle Miocene carbon isotope events: A data-model approach
peer reviewed To what extent are individual middle Miocene eccentricity-scale benthic foraminiferal carbon isotope maxima (the so-called CM events) related to changes in marine export productivity? Here we use benthic foraminiferal accumulation rates from three sites in the Pacific and Southern Ocea...
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American Geophysical Union
2013
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Online Access: | https://orbi.uliege.be/handle/2268/153090 https://doi.org/10.1002/palo.20033 |
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ftorbi:oai:orbi.ulg.ac.be:2268/153090 2024-04-21T07:51:14+00:00 Paleoproductivity during the middle Miocene carbon isotope events: A data-model approach Diester-Haass, Liselotte Billups, Katharina Jacquemin, Ingrid Emeis, Kay C. Lefebvre, Vincent François, Louis 2013 https://orbi.uliege.be/handle/2268/153090 https://doi.org/10.1002/palo.20033 en eng American Geophysical Union urn:issn:0883-8305 urn:issn:1944-9186 https://orbi.uliege.be/handle/2268/153090 info:hdl:2268/153090 doi:10.1002/palo.20033 scopus-id:2-s2.0-84879476216 restricted access http://purl.org/coar/access_right/c_16ec info:eu-repo/semantics/restrictedAccess Paleoceanography, 28, 334-346 (2013) Mid-Miocene ocean productivity carbon cycle carbon isotopic composition Milankovitch cycles Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique journal article http://purl.org/coar/resource_type/c_6501 info:eu-repo/semantics/article peer reviewed 2013 ftorbi https://doi.org/10.1002/palo.20033 2024-03-27T14:56:25Z peer reviewed To what extent are individual middle Miocene eccentricity-scale benthic foraminiferal carbon isotope maxima (the so-called CM events) related to changes in marine export productivity? Here we use benthic foraminiferal accumulation rates from three sites in the Pacific and Southern Oceans and a geochemical box model to assess relationships between benthic foraminiferal δ13C records, export productivity, and the global carbon cycle. Results from Deep Sea Drilling Project Hole 588 and Ocean Drilling Program Site 747 show a distinct productivity maximum during CM 6 at 13.8 Ma, the time of major expansion of ice on Antarctica. Productivity maxima during other CM events are only recorded at high-latitude Site 747. A set of numerical experiments tests whether changes in foraminiferal δ13C records (CM events) and export productivity can be simulated solely by sea level fluctuations and the associated changes in global weathering-deposition cycles, by sea level fluctuations plus global climatic cooling, and by sea level fluctuations plus invigorated ocean circulation. Consistent with data, the periodic forcing of sea level and albedo (and associated weathering cycles) produces δ13C variations of the correct temporal spacing, albeit with a reduced amplitude. A productivity response of the correct magnitude is achieved by enhancing ocean circulation during cold periods. We suggest that the pacing of middle Miocene δ13C fluctuations is associated with cyclical sea level variations. The amplitude, however, is muted perhaps due to the competing effects of a time-lagged response to sea level lowstands but an immediate response to invigorated ocean circulation during cold phases. Article in Journal/Newspaper Antarc* Antarctica University of Liège: ORBi (Open Repository and Bibliography) Paleoceanography 28 2 334 346 |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Mid-Miocene ocean productivity carbon cycle carbon isotopic composition Milankovitch cycles Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
spellingShingle |
Mid-Miocene ocean productivity carbon cycle carbon isotopic composition Milankovitch cycles Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique Diester-Haass, Liselotte Billups, Katharina Jacquemin, Ingrid Emeis, Kay C. Lefebvre, Vincent François, Louis Paleoproductivity during the middle Miocene carbon isotope events: A data-model approach |
topic_facet |
Mid-Miocene ocean productivity carbon cycle carbon isotopic composition Milankovitch cycles Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
description |
peer reviewed To what extent are individual middle Miocene eccentricity-scale benthic foraminiferal carbon isotope maxima (the so-called CM events) related to changes in marine export productivity? Here we use benthic foraminiferal accumulation rates from three sites in the Pacific and Southern Oceans and a geochemical box model to assess relationships between benthic foraminiferal δ13C records, export productivity, and the global carbon cycle. Results from Deep Sea Drilling Project Hole 588 and Ocean Drilling Program Site 747 show a distinct productivity maximum during CM 6 at 13.8 Ma, the time of major expansion of ice on Antarctica. Productivity maxima during other CM events are only recorded at high-latitude Site 747. A set of numerical experiments tests whether changes in foraminiferal δ13C records (CM events) and export productivity can be simulated solely by sea level fluctuations and the associated changes in global weathering-deposition cycles, by sea level fluctuations plus global climatic cooling, and by sea level fluctuations plus invigorated ocean circulation. Consistent with data, the periodic forcing of sea level and albedo (and associated weathering cycles) produces δ13C variations of the correct temporal spacing, albeit with a reduced amplitude. A productivity response of the correct magnitude is achieved by enhancing ocean circulation during cold periods. We suggest that the pacing of middle Miocene δ13C fluctuations is associated with cyclical sea level variations. The amplitude, however, is muted perhaps due to the competing effects of a time-lagged response to sea level lowstands but an immediate response to invigorated ocean circulation during cold phases. |
format |
Article in Journal/Newspaper |
author |
Diester-Haass, Liselotte Billups, Katharina Jacquemin, Ingrid Emeis, Kay C. Lefebvre, Vincent François, Louis |
author_facet |
Diester-Haass, Liselotte Billups, Katharina Jacquemin, Ingrid Emeis, Kay C. Lefebvre, Vincent François, Louis |
author_sort |
Diester-Haass, Liselotte |
title |
Paleoproductivity during the middle Miocene carbon isotope events: A data-model approach |
title_short |
Paleoproductivity during the middle Miocene carbon isotope events: A data-model approach |
title_full |
Paleoproductivity during the middle Miocene carbon isotope events: A data-model approach |
title_fullStr |
Paleoproductivity during the middle Miocene carbon isotope events: A data-model approach |
title_full_unstemmed |
Paleoproductivity during the middle Miocene carbon isotope events: A data-model approach |
title_sort |
paleoproductivity during the middle miocene carbon isotope events: a data-model approach |
publisher |
American Geophysical Union |
publishDate |
2013 |
url |
https://orbi.uliege.be/handle/2268/153090 https://doi.org/10.1002/palo.20033 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Paleoceanography, 28, 334-346 (2013) |
op_relation |
urn:issn:0883-8305 urn:issn:1944-9186 https://orbi.uliege.be/handle/2268/153090 info:hdl:2268/153090 doi:10.1002/palo.20033 scopus-id:2-s2.0-84879476216 |
op_rights |
restricted access http://purl.org/coar/access_right/c_16ec info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1002/palo.20033 |
container_title |
Paleoceanography |
container_volume |
28 |
container_issue |
2 |
container_start_page |
334 |
op_container_end_page |
346 |
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1796934661267521536 |