A highly productive Subarctic Atlantic during the Last Interglacial and the role of diatoms
The Last Interglacial (LIG), corresponding to Marine Isotope Stage (MIS) 5e, provides a reference of interglacial climate variability in the absence of anthropogenic forcing. Using an expanded section of the LIG gained at Integrated Ocean Drilling Program Site U1304 in the Subarctic Atlantic, we dem...
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:2362 2023-05-15T17:33:29+02:00 A highly productive Subarctic Atlantic during the Last Interglacial and the role of diatoms Romero, O. E Swann, G. E. A. Hodell, D. A. Helmke, P. Rey, D. Rubio, B. 2011-11 application/pdf http://eprints.esc.cam.ac.uk/2362/ http://eprints.esc.cam.ac.uk/2362/1/DAH_G32454.1.full.pdf http://geology.gsapubs.org/content/early/2011/10/04/G32454.1.abstract https://doi.org/10.1130/G32454.1 en eng http://eprints.esc.cam.ac.uk/2362/1/DAH_G32454.1.full.pdf Romero, O. E and Swann, G. E. A. and Hodell, D. A. and Helmke, P. and Rey, D. and Rubio, B. (2011) A highly productive Subarctic Atlantic during the Last Interglacial and the role of diatoms. Geology, 39 (11). pp. 1015-1018. DOI https://doi.org/10.1130/G32454.1 <https://doi.org/10.1130/G32454.1> 01 - Climate Change and Earth-Ocean Atmosphere Systems Article PeerReviewed 2011 ftucambridgeesc https://doi.org/10.1130/G32454.1 2020-08-27T18:09:16Z The Last Interglacial (LIG), corresponding to Marine Isotope Stage (MIS) 5e, provides a reference of interglacial climate variability in the absence of anthropogenic forcing. Using an expanded section of the LIG gained at Integrated Ocean Drilling Program Site U1304 in the Subarctic Atlantic, we demonstrate that the early MIS 5e was marked by oceanographic conditions conducive for high diatom production and accumulation. The appearance of diatom-dominated laminated oozes ∼3 k.y. after the beginning of MIS 5e at ca. 125 ka coincides with a shift to higher δ30Sidiat values together with the dominance of Thalassiothrix longissima, indicative of increased nutrient availability and silicic acid utilization in surface waters. Though the Subarctic Front provided the physical conditions for high diatom production and deposition, these processes alone are insufficient to explain the high rates of siliceous productivity and the formation of diatomaceous sediments. Instead, the additional presence of an increased nutrient pool provided by Subantarctic Mode Water played the decisive role in initiating and sustaining diatom production. The high diatom productivity and the occurrence of diatomaceous sediments in the late Quaternary challenge the current hypothesis of a silica-depleted North Atlantic during the LIG. Article in Journal/Newspaper North Atlantic Subarctic University of Cambridge, Department of Earth Sciences: ESC Publications Geology 39 11 1015 1018 |
institution |
Open Polar |
collection |
University of Cambridge, Department of Earth Sciences: ESC Publications |
op_collection_id |
ftucambridgeesc |
language |
English |
topic |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
spellingShingle |
01 - Climate Change and Earth-Ocean Atmosphere Systems Romero, O. E Swann, G. E. A. Hodell, D. A. Helmke, P. Rey, D. Rubio, B. A highly productive Subarctic Atlantic during the Last Interglacial and the role of diatoms |
topic_facet |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
description |
The Last Interglacial (LIG), corresponding to Marine Isotope Stage (MIS) 5e, provides a reference of interglacial climate variability in the absence of anthropogenic forcing. Using an expanded section of the LIG gained at Integrated Ocean Drilling Program Site U1304 in the Subarctic Atlantic, we demonstrate that the early MIS 5e was marked by oceanographic conditions conducive for high diatom production and accumulation. The appearance of diatom-dominated laminated oozes ∼3 k.y. after the beginning of MIS 5e at ca. 125 ka coincides with a shift to higher δ30Sidiat values together with the dominance of Thalassiothrix longissima, indicative of increased nutrient availability and silicic acid utilization in surface waters. Though the Subarctic Front provided the physical conditions for high diatom production and deposition, these processes alone are insufficient to explain the high rates of siliceous productivity and the formation of diatomaceous sediments. Instead, the additional presence of an increased nutrient pool provided by Subantarctic Mode Water played the decisive role in initiating and sustaining diatom production. The high diatom productivity and the occurrence of diatomaceous sediments in the late Quaternary challenge the current hypothesis of a silica-depleted North Atlantic during the LIG. |
format |
Article in Journal/Newspaper |
author |
Romero, O. E Swann, G. E. A. Hodell, D. A. Helmke, P. Rey, D. Rubio, B. |
author_facet |
Romero, O. E Swann, G. E. A. Hodell, D. A. Helmke, P. Rey, D. Rubio, B. |
author_sort |
Romero, O. E |
title |
A highly productive Subarctic Atlantic during the Last Interglacial and the role of diatoms |
title_short |
A highly productive Subarctic Atlantic during the Last Interglacial and the role of diatoms |
title_full |
A highly productive Subarctic Atlantic during the Last Interglacial and the role of diatoms |
title_fullStr |
A highly productive Subarctic Atlantic during the Last Interglacial and the role of diatoms |
title_full_unstemmed |
A highly productive Subarctic Atlantic during the Last Interglacial and the role of diatoms |
title_sort |
highly productive subarctic atlantic during the last interglacial and the role of diatoms |
publishDate |
2011 |
url |
http://eprints.esc.cam.ac.uk/2362/ http://eprints.esc.cam.ac.uk/2362/1/DAH_G32454.1.full.pdf http://geology.gsapubs.org/content/early/2011/10/04/G32454.1.abstract https://doi.org/10.1130/G32454.1 |
genre |
North Atlantic Subarctic |
genre_facet |
North Atlantic Subarctic |
op_relation |
http://eprints.esc.cam.ac.uk/2362/1/DAH_G32454.1.full.pdf Romero, O. E and Swann, G. E. A. and Hodell, D. A. and Helmke, P. and Rey, D. and Rubio, B. (2011) A highly productive Subarctic Atlantic during the Last Interglacial and the role of diatoms. Geology, 39 (11). pp. 1015-1018. DOI https://doi.org/10.1130/G32454.1 <https://doi.org/10.1130/G32454.1> |
op_doi |
https://doi.org/10.1130/G32454.1 |
container_title |
Geology |
container_volume |
39 |
container_issue |
11 |
container_start_page |
1015 |
op_container_end_page |
1018 |
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1766132006402392064 |