Glacial marine nutrient and carbon redistribution: Evidence from the tropical ocean
Loubere, P., M. Fariduddin, and M. Richaud (2011), Glacial marine nutrient and carbon redistribution: Evidence from the tropical ocean, Geochem. Geophys. Geosyst., 12, Q08013, doi:10.1029/2011GC003546. Copyright 2011 by the American Geophysical Union. The nature and timing of marine nutrient and car...
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ftcalifstateuniv:oai:dspace.calstate.edu:10211.3/200449 2023-05-15T18:25:43+02:00 Glacial marine nutrient and carbon redistribution: Evidence from the tropical ocean Richaud, Mathieu Loubere, Paul Fariduddin, Mohammad Richaud, Mathieu Richaud, Mathieu. California State University, Fresno. College of Science and Mathematics. Department of Earth & Environmental Science Loubere, Paul. Northern Illinois University. Department Geology & Environmental Geoscience Fariduddin, Mohammad. Northeastern Illinois University. Department Earth Science 2011 http://hdl.handle.net/10211.3/200449 https://doi.org/10.1029/2011GC003546 en_US eng American Geophysical Union (AGU) Geochemical Society dx.doi.org/10.1029/2011GC003546 Geochemistry, Geophysics, Geosystems (ESSN: 1525-2027). Vol. 12, Q08013 doi:10.1029/2011GC003546 http://hdl.handle.net/10211.3/200449 2011 ftcalifstateuniv https://doi.org/10.1029/2011GC003546 2022-04-13T11:39:23Z Loubere, P., M. Fariduddin, and M. Richaud (2011), Glacial marine nutrient and carbon redistribution: Evidence from the tropical ocean, Geochem. Geophys. Geosyst., 12, Q08013, doi:10.1029/2011GC003546. Copyright 2011 by the American Geophysical Union. The nature and timing of marine nutrient and carbon redistribution through a glacial cycle remains unclear. Understanding transfers to and from the surface and deep ocean reservoirs is important to explaining Pleistocene variation in atmospheric CO2 content. Observations in the modern ocean show that the nutrient supply to the tropical upwelling regions depends on content of deep reservoirs and vertical mixing in the Southern and subantarctic oceans. Previous work in the Pacific demonstrated that nutrient supply to the tropics was reduced during the Glacial, consonant with reduced vertical mixing in the Southern Ocean. We examine the glacial record of the tropical Atlantic with the same methods used in the Pacific (N. dutertrei carbon isotope data combined with export production estimates to evaluate changes in thermocline nutrient content). In contrast to the Pacific, we find evidence for an increase in tropical Atlantic nutrient supply under glacial conditions. The source of nutrients can be traced to subantarctic surface waters and ultimately to an enriched abyssal reservoir. Bathymetrically forced vertical mixing could account for the transfer of nutrients from this reservoir in the S. Atlantic. The enriched reservoir developed in early MIS 4 (75 ka) and persisted until about 14.5 ka (Bolling/Allerod). This timing corresponds to shifts in atmospheric CO2 content from intermediate to minimum (full glacial) levels at 75 ka and from intermediate to Holocene concentrations near 14.5 ka. Other/Unknown Material Southern Ocean California State University (CSU): DSpace Pacific Southern Ocean Geochemistry, Geophysics, Geosystems 12 8 n/a n/a |
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California State University (CSU): DSpace |
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ftcalifstateuniv |
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English |
description |
Loubere, P., M. Fariduddin, and M. Richaud (2011), Glacial marine nutrient and carbon redistribution: Evidence from the tropical ocean, Geochem. Geophys. Geosyst., 12, Q08013, doi:10.1029/2011GC003546. Copyright 2011 by the American Geophysical Union. The nature and timing of marine nutrient and carbon redistribution through a glacial cycle remains unclear. Understanding transfers to and from the surface and deep ocean reservoirs is important to explaining Pleistocene variation in atmospheric CO2 content. Observations in the modern ocean show that the nutrient supply to the tropical upwelling regions depends on content of deep reservoirs and vertical mixing in the Southern and subantarctic oceans. Previous work in the Pacific demonstrated that nutrient supply to the tropics was reduced during the Glacial, consonant with reduced vertical mixing in the Southern Ocean. We examine the glacial record of the tropical Atlantic with the same methods used in the Pacific (N. dutertrei carbon isotope data combined with export production estimates to evaluate changes in thermocline nutrient content). In contrast to the Pacific, we find evidence for an increase in tropical Atlantic nutrient supply under glacial conditions. The source of nutrients can be traced to subantarctic surface waters and ultimately to an enriched abyssal reservoir. Bathymetrically forced vertical mixing could account for the transfer of nutrients from this reservoir in the S. Atlantic. The enriched reservoir developed in early MIS 4 (75 ka) and persisted until about 14.5 ka (Bolling/Allerod). This timing corresponds to shifts in atmospheric CO2 content from intermediate to minimum (full glacial) levels at 75 ka and from intermediate to Holocene concentrations near 14.5 ka. |
author2 |
Richaud, Mathieu Richaud, Mathieu. California State University, Fresno. College of Science and Mathematics. Department of Earth & Environmental Science Loubere, Paul. Northern Illinois University. Department Geology & Environmental Geoscience Fariduddin, Mohammad. Northeastern Illinois University. Department Earth Science |
author |
Richaud, Mathieu Loubere, Paul Fariduddin, Mohammad |
spellingShingle |
Richaud, Mathieu Loubere, Paul Fariduddin, Mohammad Glacial marine nutrient and carbon redistribution: Evidence from the tropical ocean |
author_facet |
Richaud, Mathieu Loubere, Paul Fariduddin, Mohammad |
author_sort |
Richaud, Mathieu |
title |
Glacial marine nutrient and carbon redistribution: Evidence from the tropical ocean |
title_short |
Glacial marine nutrient and carbon redistribution: Evidence from the tropical ocean |
title_full |
Glacial marine nutrient and carbon redistribution: Evidence from the tropical ocean |
title_fullStr |
Glacial marine nutrient and carbon redistribution: Evidence from the tropical ocean |
title_full_unstemmed |
Glacial marine nutrient and carbon redistribution: Evidence from the tropical ocean |
title_sort |
glacial marine nutrient and carbon redistribution: evidence from the tropical ocean |
publisher |
American Geophysical Union (AGU) |
publishDate |
2011 |
url |
http://hdl.handle.net/10211.3/200449 https://doi.org/10.1029/2011GC003546 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
dx.doi.org/10.1029/2011GC003546 Geochemistry, Geophysics, Geosystems (ESSN: 1525-2027). Vol. 12, Q08013 doi:10.1029/2011GC003546 http://hdl.handle.net/10211.3/200449 |
op_doi |
https://doi.org/10.1029/2011GC003546 |
container_title |
Geochemistry, Geophysics, Geosystems |
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12 |
container_issue |
8 |
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1766207334959284224 |