Saved in:
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2014
|
| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.829755 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1867171823456616448 |
|---|---|
| author | Waelbroeck, Claire Skinner, Luke C Labeyrie, Laurent D Duplessy, Jean-Claude Michel, Elisabeth Vázquez Riveiros, Natalia Gherardi, Jeanne-Marie Dewilde, Fabien |
| author_facet | Waelbroeck, Claire Skinner, Luke C Labeyrie, Laurent D Duplessy, Jean-Claude Michel, Elisabeth Vázquez Riveiros, Natalia Gherardi, Jeanne-Marie Dewilde, Fabien |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Well-dated benthic foraminifer oxygen isotopic records (d18O) from different water depths and locations within the Atlantic Ocean exhibit distinct patterns and significant differences in timing over the last deglaciation. This has two implications: on the one hand, it confirms that benthic d18O cannot be used as a global correlation tool with millennial-scale precision, but on the other hand, the combination of benthic isotopic records with independent dating provides a wealth of information on past circulation changes. Comparing new South Atlantic benthic isotopic data with published benthic isotopic records, we show that (1) circulation changes first affected benthic d18O in the 1000-2200 m range, with marked decreases in benthic d18O taking place at ~17.5 cal. kyr B.P. (ka) due to the southward propagation of brine waters generated in the Nordic Seas during Heinrich Stadial 1 (HS1) cold period; (2) the arrival of d18O-depleted deglacial meltwater took place later at deeper North Atlantic sites; (3) hydrographic changes recorded in North Atlantic cores below 3000 m during HS1 do not correspond to simple alternations between northern- and southern-sourced water but likely reflect instead the incursion of brine-generated deep water of northern as well as southern origin; and (4) South Atlantic waters at ~44°S and ~3800 m depth remained isolated from better-ventilated northern-sourced water masses until after the resumption of North Atlantic Deep Water (NADW) formation at the onset of the Bølling-Allerod, which led to the propagation of NADW into the South Atlantic. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_829755 |
| institution | PANGAEA |
| language | en |
| publishDate | 2014 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table S1) Age determination of Atlantic Ocean sediment cores Waelbroeck, Claire Skinner, Luke C Labeyrie, Laurent D Duplessy, Jean-Claude Michel, Elisabeth Vázquez Riveiros, Natalia Gherardi, Jeanne-Marie Dewilde, Fabien 90b; Age, 14C AMS; Age, 14C calibrated; Age, dated; Age, dated, standard deviation; Age, dated material; Azores; BC; Box corer; Calendar age; Calendar age, standard error; CALYPSO; Calypso Corer; Calypso Square Core System; CASQS; CH69-K09; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; ENAM9321; ENAM93-21; Event label; Faroe Islands margin; GC; GeoB1711; GeoB1711-4; Gravity corer; Gravity corer (Kiel type); IMAGES I; IMAGES V; IMAGES XV - Pachiderme; KAL; Kasten corer; KN_USA; Knorr; KNR31GPC5; Laboratory code/label; Latitude of event; Longitude of event; M20/2; Marion Dufresne (1995); MD07-3076; MD07-3076Q; MD101__Campaign; MD114; MD159; MD952037; MD95-2037; MD99-2334; Meteor (1986); NA87-22; Namibia continental slope; Newfoundland margin; North Atlantic Ocean; PC; Piston corer; SL Well-dated benthic foraminifer oxygen isotopic records (d18O) from different water depths and locations within the Atlantic Ocean exhibit distinct patterns and significant differences in timing over the last deglaciation. This has two implications: on the one hand, it confirms that benthic d18O cannot be used as a global correlation tool with millennial-scale precision, but on the other hand, the combination of benthic isotopic records with independent dating provides a wealth of information on past circulation changes. Comparing new South Atlantic benthic isotopic data with published benthic isotopic records, we show that (1) circulation changes first affected benthic d18O in the 1000-2200 m range, with marked decreases in benthic d18O taking place at ~17.5 cal. kyr B.P. (ka) due to the southward propagation of brine waters generated in the Nordic Seas during Heinrich Stadial 1 (HS1) cold period; (2) the arrival of d18O-depleted deglacial meltwater took place later at deeper North Atlantic sites; (3) hydrographic changes recorded in North Atlantic cores below 3000 m during HS1 do not correspond to simple alternations between northern- and southern-sourced water but likely reflect instead the incursion of brine-generated deep water of northern as well as southern origin; and (4) South Atlantic waters at ~44°S and ~3800 m depth remained isolated from better-ventilated northern-sourced water masses until after the resumption of North Atlantic Deep Water (NADW) formation at the onset of the Bølling-Allerod, which led to the propagation of NADW into the South Atlantic. |
| title | (Table S1) Age determination of Atlantic Ocean sediment cores |
| topic | 90b; Age, 14C AMS; Age, 14C calibrated; Age, dated; Age, dated, standard deviation; Age, dated material; Azores; BC; Box corer; Calendar age; Calendar age, standard error; CALYPSO; Calypso Corer; Calypso Square Core System; CASQS; CH69-K09; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elevation of event; ENAM9321; ENAM93-21; Event label; Faroe Islands margin; GC; GeoB1711; GeoB1711-4; Gravity corer; Gravity corer (Kiel type); IMAGES I; IMAGES V; IMAGES XV - Pachiderme; KAL; Kasten corer; KN_USA; Knorr; KNR31GPC5; Laboratory code/label; Latitude of event; Longitude of event; M20/2; Marion Dufresne (1995); MD07-3076; MD07-3076Q; MD101__Campaign; MD114; MD159; MD952037; MD95-2037; MD99-2334; Meteor (1986); NA87-22; Namibia continental slope; Newfoundland margin; North Atlantic Ocean; PC; Piston corer; SL |
| url | https://doi.org/10.1594/PANGAEA.829755 |