OCE326-GGC6, OCE326-GGC5 and KNR31-GPC5 (Bermuda rise) deglacial record: diatom, foraminifer and magnetic susceptibility
Diatom assemblages document surface hydrographic changes over the Bermuda Rise. Between 19.2 and 14.5 ka, subtropical diatom species and Chaetoceros resting spores dominate the flora, as in North Atlantic productive regions today. From 16.9 to 14.6 ka, brackish and fresh water diatoms are common and...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.943568 2024-06-23T07:55:00+00:00 OCE326-GGC6, OCE326-GGC5 and KNR31-GPC5 (Bermuda rise) deglacial record: diatom, foraminifer and magnetic susceptibility Gil, Isabelle M Keigwin, Lloyd D Abrantes, Fatima F MEDIAN LATITUDE: 33.692786 * MEDIAN LONGITUDE: -57.583657 * SOUTH-BOUND LATITUDE: 33.686700 * WEST-BOUND LONGITUDE: -57.615000 * NORTH-BOUND LATITUDE: 33.700000 * EAST-BOUND LONGITUDE: -57.576000 2022 application/zip, 7 datasets https://doi.pangaea.de/10.1594/PANGAEA.943568 https://doi.org/10.1594/PANGAEA.943568 en eng PANGAEA Gil, Isabelle M; Keigwin, Lloyd D; Abrantes, Fatima F (2009): Deglacial diatom productivity and surface ocean properties over the Bermuda Rise, northeast Sargasso Sea. Paleoceanography, 24(4), https://doi.org/10.1029/2008PA001729 https://doi.pangaea.de/10.1594/PANGAEA.943568 https://doi.org/10.1594/PANGAEA.943568 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess Diatom Heinrich Event 1 icebergs subtropical North Atlantic Dataset 2022 ftpangaea https://doi.org/10.1594/PANGAEA.94356810.1029/2008PA001729 2024-06-12T14:17:12Z Diatom assemblages document surface hydrographic changes over the Bermuda Rise. Between 19.2 and 14.5 ka, subtropical diatom species and Chaetoceros resting spores dominate the flora, as in North Atlantic productive regions today. From 16.9 to 14.6 ka, brackish and fresh water diatoms are common and their contribution is generally coupled with total diatom abundance. This same interval also contains rare grains of ice-rafted debris. Coupling between those proxies suggests that successive discharge of icebergs might have stimulated productivity during Heinrich event 1 (H1). Iceberg migration to the subtropics likely created an isolated environment involving turbulent mixing, upwelled water, and nutrient-rich meltwater, supporting diatom productivity in an otherwise oligotrophic setting. In addition, the occurrence of mode water eddies likely brought silica-rich waters of Southern Ocean origin to the euphotic zone. The persistence of lower-salinity surface water beyond the last ice rafting suggests continued injection of fresh water by cold-core rings and advection around the subtropical gyre. These results indicate that opal productivity may have biased estimates of meridional overturning based on 231Pa/230Th ratios in Bermuda Rise sediments during H1. Dataset North Atlantic Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science Southern Ocean ENVELOPE(-57.615000,-57.576000,33.700000,33.686700) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Diatom Heinrich Event 1 icebergs subtropical North Atlantic |
spellingShingle |
Diatom Heinrich Event 1 icebergs subtropical North Atlantic Gil, Isabelle M Keigwin, Lloyd D Abrantes, Fatima F OCE326-GGC6, OCE326-GGC5 and KNR31-GPC5 (Bermuda rise) deglacial record: diatom, foraminifer and magnetic susceptibility |
topic_facet |
Diatom Heinrich Event 1 icebergs subtropical North Atlantic |
description |
Diatom assemblages document surface hydrographic changes over the Bermuda Rise. Between 19.2 and 14.5 ka, subtropical diatom species and Chaetoceros resting spores dominate the flora, as in North Atlantic productive regions today. From 16.9 to 14.6 ka, brackish and fresh water diatoms are common and their contribution is generally coupled with total diatom abundance. This same interval also contains rare grains of ice-rafted debris. Coupling between those proxies suggests that successive discharge of icebergs might have stimulated productivity during Heinrich event 1 (H1). Iceberg migration to the subtropics likely created an isolated environment involving turbulent mixing, upwelled water, and nutrient-rich meltwater, supporting diatom productivity in an otherwise oligotrophic setting. In addition, the occurrence of mode water eddies likely brought silica-rich waters of Southern Ocean origin to the euphotic zone. The persistence of lower-salinity surface water beyond the last ice rafting suggests continued injection of fresh water by cold-core rings and advection around the subtropical gyre. These results indicate that opal productivity may have biased estimates of meridional overturning based on 231Pa/230Th ratios in Bermuda Rise sediments during H1. |
format |
Dataset |
author |
Gil, Isabelle M Keigwin, Lloyd D Abrantes, Fatima F |
author_facet |
Gil, Isabelle M Keigwin, Lloyd D Abrantes, Fatima F |
author_sort |
Gil, Isabelle M |
title |
OCE326-GGC6, OCE326-GGC5 and KNR31-GPC5 (Bermuda rise) deglacial record: diatom, foraminifer and magnetic susceptibility |
title_short |
OCE326-GGC6, OCE326-GGC5 and KNR31-GPC5 (Bermuda rise) deglacial record: diatom, foraminifer and magnetic susceptibility |
title_full |
OCE326-GGC6, OCE326-GGC5 and KNR31-GPC5 (Bermuda rise) deglacial record: diatom, foraminifer and magnetic susceptibility |
title_fullStr |
OCE326-GGC6, OCE326-GGC5 and KNR31-GPC5 (Bermuda rise) deglacial record: diatom, foraminifer and magnetic susceptibility |
title_full_unstemmed |
OCE326-GGC6, OCE326-GGC5 and KNR31-GPC5 (Bermuda rise) deglacial record: diatom, foraminifer and magnetic susceptibility |
title_sort |
oce326-ggc6, oce326-ggc5 and knr31-gpc5 (bermuda rise) deglacial record: diatom, foraminifer and magnetic susceptibility |
publisher |
PANGAEA |
publishDate |
2022 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.943568 https://doi.org/10.1594/PANGAEA.943568 |
op_coverage |
MEDIAN LATITUDE: 33.692786 * MEDIAN LONGITUDE: -57.583657 * SOUTH-BOUND LATITUDE: 33.686700 * WEST-BOUND LONGITUDE: -57.615000 * NORTH-BOUND LATITUDE: 33.700000 * EAST-BOUND LONGITUDE: -57.576000 |
long_lat |
ENVELOPE(-57.615000,-57.576000,33.700000,33.686700) |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_relation |
Gil, Isabelle M; Keigwin, Lloyd D; Abrantes, Fatima F (2009): Deglacial diatom productivity and surface ocean properties over the Bermuda Rise, northeast Sargasso Sea. Paleoceanography, 24(4), https://doi.org/10.1029/2008PA001729 https://doi.pangaea.de/10.1594/PANGAEA.943568 https://doi.org/10.1594/PANGAEA.943568 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.94356810.1029/2008PA001729 |
_version_ |
1802647391898173440 |