(Supplement Fig. 2-4) Proxy data from IODP Site 306-U1314
Subsurface water column dynamics in the subpo-lar North Atlantic were reconstructed in order to improve theunderstanding of the cause of abrupt ice-rafted detritus (IRD)events during cold periods of the early Pleistocene. We usedpaired Mg/Ca andδ18O measurements ofNeogloboquad-rina pachyderma(sinist...
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Format: | Dataset |
Language: | English |
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PANGAEA
2018
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.891147 https://doi.org/10.1594/PANGAEA.891147 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.891147 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
306-U1314 AGE COMPCORE Composite Core DEPTH sediment/rock Exp306 Foraminifera benthic δ13C benthic δ18O Ice rafted debris Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Joides Resolution Neogloboquadrina pachyderma sinistral δ13C δ18O North Atlantic North Atlantic Climate 2 Ratio Temperature calculated Δδ13C seawater reconstructed |
spellingShingle |
306-U1314 AGE COMPCORE Composite Core DEPTH sediment/rock Exp306 Foraminifera benthic δ13C benthic δ18O Ice rafted debris Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Joides Resolution Neogloboquadrina pachyderma sinistral δ13C δ18O North Atlantic North Atlantic Climate 2 Ratio Temperature calculated Δδ13C seawater reconstructed Hernández-Almeida, Iván Sierro, Francisco Javier Cacho, Isabel Flores, José-Abel (Supplement Fig. 2-4) Proxy data from IODP Site 306-U1314 |
topic_facet |
306-U1314 AGE COMPCORE Composite Core DEPTH sediment/rock Exp306 Foraminifera benthic δ13C benthic δ18O Ice rafted debris Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Joides Resolution Neogloboquadrina pachyderma sinistral δ13C δ18O North Atlantic North Atlantic Climate 2 Ratio Temperature calculated Δδ13C seawater reconstructed |
description |
Subsurface water column dynamics in the subpo-lar North Atlantic were reconstructed in order to improve theunderstanding of the cause of abrupt ice-rafted detritus (IRD)events during cold periods of the early Pleistocene. We usedpaired Mg/Ca andδ18O measurements ofNeogloboquad-rina pachyderma(sinistral - sin.), deep-dwelling planktonicforaminifera, to estimate the subsurface temperatures andseawaterδ18O from a sediment core from Gardar Drift, inthe subpolar North Atlantic. Carbon isotopes of benthic andplanktonic foraminifera from the same site provide informa-tion about the ventilation and water column nutrient gradient . Mg/Ca-based temperatures and seawaterδ18O suggestincreased subsurface temperatures and salinities during ice-rafting, likely due to northward subsurface transport of sub-tropical waters during periods of weaker Atlantic MeridionalOverturning Circulation (AMOC). Planktonic carbon iso-topes support this suggestion, showing coincident increasedsubsurface ventilation during deposition of IRD. Subsurfaceaccumulation of warm waters would have resulted in basalwarming and break-up of ice-shelves, leading to massive ice-berg discharges in the North Atlantic. The release of heatstored at the subsurface to the atmosphere would have helpedto restart the AMOC. This mechanism is in agreement withmodelling and proxy studies that observe a subsurface warm-ing in the North Atlantic in response to AMOC slowdownduring Marine Isotope Stage (MIS) 3. |
format |
Dataset |
author |
Hernández-Almeida, Iván Sierro, Francisco Javier Cacho, Isabel Flores, José-Abel |
author_facet |
Hernández-Almeida, Iván Sierro, Francisco Javier Cacho, Isabel Flores, José-Abel |
author_sort |
Hernández-Almeida, Iván |
title |
(Supplement Fig. 2-4) Proxy data from IODP Site 306-U1314 |
title_short |
(Supplement Fig. 2-4) Proxy data from IODP Site 306-U1314 |
title_full |
(Supplement Fig. 2-4) Proxy data from IODP Site 306-U1314 |
title_fullStr |
(Supplement Fig. 2-4) Proxy data from IODP Site 306-U1314 |
title_full_unstemmed |
(Supplement Fig. 2-4) Proxy data from IODP Site 306-U1314 |
title_sort |
(supplement fig. 2-4) proxy data from iodp site 306-u1314 |
publisher |
PANGAEA |
publishDate |
2018 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.891147 https://doi.org/10.1594/PANGAEA.891147 |
op_coverage |
LATITUDE: 56.364000 * LONGITUDE: -27.888000 * DATE/TIME START: 2005-04-07T00:00:00 * DATE/TIME END: 2005-04-10T00:00:00 * MINIMUM DEPTH, sediment/rock: 60.00 m * MAXIMUM DEPTH, sediment/rock: 84.16 m |
long_lat |
ENVELOPE(-27.888000,-27.888000,56.364000,56.364000) |
genre |
Ice Shelves Neogloboquadrina pachyderma North Atlantic |
genre_facet |
Ice Shelves Neogloboquadrina pachyderma North Atlantic |
op_source |
Supplement to: Hernández-Almeida, Iván; Sierro, Francisco Javier; Cacho, Isabel; Flores, José-Abel (2015): Subsurface North Atlantic warming as a trigger of rapid cooling events: evidence from the early Pleistocene (MIS 31–19). Climate of the Past, 11(4), 687-696, https://doi.org/10.5194/cp-11-687-2015 |
op_relation |
Elderfield, Henry; Ganssen, Gerald M (2000): Past temperature and d18O of surface ocean waters inferred from foraminiferal Mg/Ca ratios. Nature, 405(6785), 442-445, https://doi.org/10.1038/35013033 Meland, Marius Y; Jansen, Eystein; Elderfield, Henry (2005): Constraints on SST estimates for the northern North Atlantic/Nordic Seas during the LGM. Quaternary Science Reviews, 24(7-9), 835-852, https://doi.org/10.1016/j.quascirev.2004.05.011 Shackleton, Nicholas J (1974): Attainment of isotopic equilibrium between ocean water and the benthonic foraminifera genus Uvigerina: isotopic changes in the ocean during the last glacial. In: Labeyrie, L. (ed.) Les méthodes quantitatives d'etude des variation du climat au cours du Pléistocène. Colloques Internationaux du C.N.R.S (Centre Nationale de la Recherche Scientifique), 219, 203–209, hdl:10013/epic.41396.d001 https://doi.pangaea.de/10.1594/PANGAEA.891147 https://doi.org/10.1594/PANGAEA.891147 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.891147 https://doi.org/10.5194/cp-11-687-2015 https://doi.org/10.1038/35013033 https://doi.org/10.1016/j.quascirev.2004.05.011 |
_version_ |
1766032459408867328 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.891147 2023-05-15T16:41:59+02:00 (Supplement Fig. 2-4) Proxy data from IODP Site 306-U1314 Hernández-Almeida, Iván Sierro, Francisco Javier Cacho, Isabel Flores, José-Abel LATITUDE: 56.364000 * LONGITUDE: -27.888000 * DATE/TIME START: 2005-04-07T00:00:00 * DATE/TIME END: 2005-04-10T00:00:00 * MINIMUM DEPTH, sediment/rock: 60.00 m * MAXIMUM DEPTH, sediment/rock: 84.16 m 2018-06-18 text/tab-separated-values, 4836 data points https://doi.pangaea.de/10.1594/PANGAEA.891147 https://doi.org/10.1594/PANGAEA.891147 en eng PANGAEA Elderfield, Henry; Ganssen, Gerald M (2000): Past temperature and d18O of surface ocean waters inferred from foraminiferal Mg/Ca ratios. Nature, 405(6785), 442-445, https://doi.org/10.1038/35013033 Meland, Marius Y; Jansen, Eystein; Elderfield, Henry (2005): Constraints on SST estimates for the northern North Atlantic/Nordic Seas during the LGM. Quaternary Science Reviews, 24(7-9), 835-852, https://doi.org/10.1016/j.quascirev.2004.05.011 Shackleton, Nicholas J (1974): Attainment of isotopic equilibrium between ocean water and the benthonic foraminifera genus Uvigerina: isotopic changes in the ocean during the last glacial. In: Labeyrie, L. (ed.) Les méthodes quantitatives d'etude des variation du climat au cours du Pléistocène. Colloques Internationaux du C.N.R.S (Centre Nationale de la Recherche Scientifique), 219, 203–209, hdl:10013/epic.41396.d001 https://doi.pangaea.de/10.1594/PANGAEA.891147 https://doi.org/10.1594/PANGAEA.891147 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Hernández-Almeida, Iván; Sierro, Francisco Javier; Cacho, Isabel; Flores, José-Abel (2015): Subsurface North Atlantic warming as a trigger of rapid cooling events: evidence from the early Pleistocene (MIS 31–19). Climate of the Past, 11(4), 687-696, https://doi.org/10.5194/cp-11-687-2015 306-U1314 AGE COMPCORE Composite Core DEPTH sediment/rock Exp306 Foraminifera benthic δ13C benthic δ18O Ice rafted debris Integrated Ocean Drilling Program / International Ocean Discovery Program IODP Joides Resolution Neogloboquadrina pachyderma sinistral δ13C δ18O North Atlantic North Atlantic Climate 2 Ratio Temperature calculated Δδ13C seawater reconstructed Dataset 2018 ftpangaea https://doi.org/10.1594/PANGAEA.891147 https://doi.org/10.5194/cp-11-687-2015 https://doi.org/10.1038/35013033 https://doi.org/10.1016/j.quascirev.2004.05.011 2023-01-20T09:11:11Z Subsurface water column dynamics in the subpo-lar North Atlantic were reconstructed in order to improve theunderstanding of the cause of abrupt ice-rafted detritus (IRD)events during cold periods of the early Pleistocene. We usedpaired Mg/Ca andδ18O measurements ofNeogloboquad-rina pachyderma(sinistral - sin.), deep-dwelling planktonicforaminifera, to estimate the subsurface temperatures andseawaterδ18O from a sediment core from Gardar Drift, inthe subpolar North Atlantic. Carbon isotopes of benthic andplanktonic foraminifera from the same site provide informa-tion about the ventilation and water column nutrient gradient . Mg/Ca-based temperatures and seawaterδ18O suggestincreased subsurface temperatures and salinities during ice-rafting, likely due to northward subsurface transport of sub-tropical waters during periods of weaker Atlantic MeridionalOverturning Circulation (AMOC). Planktonic carbon iso-topes support this suggestion, showing coincident increasedsubsurface ventilation during deposition of IRD. Subsurfaceaccumulation of warm waters would have resulted in basalwarming and break-up of ice-shelves, leading to massive ice-berg discharges in the North Atlantic. The release of heatstored at the subsurface to the atmosphere would have helpedto restart the AMOC. This mechanism is in agreement withmodelling and proxy studies that observe a subsurface warm-ing in the North Atlantic in response to AMOC slowdownduring Marine Isotope Stage (MIS) 3. Dataset Ice Shelves Neogloboquadrina pachyderma North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-27.888000,-27.888000,56.364000,56.364000) |