Stable oxygen isotope and Mg/Ca data of Globigerinoides ruber white, water stable oxygen isotope data, SST and MAT records of sediment core GeoB6211-2
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| Autores principales: | , , , , , |
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
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PANGAEA
2015
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| _version_ | 1867168167839662080 |
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| author | Chiessi, Cristiano Mazur Mulitza, Stefan Mollenhauer, Gesine Silva, Juliana Braga Groeneveld, Jeroen Prange, Matthias |
| author_facet | Chiessi, Cristiano Mazur Mulitza, Stefan Mollenhauer, Gesine Silva, Juliana Braga Groeneveld, Jeroen Prange, Matthias |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | During Termination 1, millennial-scale weakening events of the Atlantic meridional overturning circulation (AMOC) supposedly produced major changes in sea surface temperatures (SSTs) of the western South Atlantic, and in mean air temperatures (MATs) over southeastern South America. It has been suggested, for instance, that the Brazil Current (BC) would strengthen (weaken) and the North Brazil Current (NBC) would weaken (strengthen) during slowdown (speed-up) events of the AMOC. This anti-phase pattern was claimed to be a necessary response to the decreased North Atlantic heat piracy during periods of weak AMOC. However, the thermal evolution of the western South Atlantic and the adjacent continent is so far largely unknown. Here we address this issue, presenting high-temporal-resolution SST and MAT records from the BC and southeastern South America, respectively. We identify a warming in the western South Atlantic during Heinrich Stadial 1 (HS1), which is followed first by a drop and then by increasing temperatures during the Bølling–Allerød, in phase with an existing SST record from the NBC. Additionally, a similar SST evolution is shown by a southernmost eastern South Atlantic record, suggesting a South Atlantic-wide pattern in SST evolution during most of Termination 1. Over southeastern South America, our MAT record shows a two-step increase during Termination 1, synchronous with atmospheric CO2 rise (i.e., during the second half of HS1 and during the Younger Dryas), and lagging abrupt SST changes by several thousand years. This delay corroborates the notion that the long duration of HS1 was fundamental in driving the Earth out of the last glacial. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_847352 |
| institution | PANGAEA |
| language | en |
| publishDate | 2015 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Stable oxygen isotope and Mg/Ca data of Globigerinoides ruber white, water stable oxygen isotope data, SST and MAT records of sediment core GeoB6211-2 Chiessi, Cristiano Mazur Mulitza, Stefan Mollenhauer, Gesine Silva, Juliana Braga Groeneveld, Jeroen Prange, Matthias AGE; Argentine Basin; Calculated, according to Anand et al. (2003); Calculated from MBT'/CBT (Peterse et al., 2012); calibrated; Center for Marine Environmental Sciences; DEPTH, sediment/rock; GeoB6211-2; Globigerinoides ruber white, Magnesium/Calcium ratio; Globigerinoides ruber white, δ18O; Gravity corer (Kiel type); Ice volume corrected; ICP-OES, Inductively coupled plasma - optical emission spectrometry; Isotope ratio mass spectrometry; M46/2; MARUM; Meteor (1986); Sea surface temperature; SL; Temperature, annual mean; δ18O, water During Termination 1, millennial-scale weakening events of the Atlantic meridional overturning circulation (AMOC) supposedly produced major changes in sea surface temperatures (SSTs) of the western South Atlantic, and in mean air temperatures (MATs) over southeastern South America. It has been suggested, for instance, that the Brazil Current (BC) would strengthen (weaken) and the North Brazil Current (NBC) would weaken (strengthen) during slowdown (speed-up) events of the AMOC. This anti-phase pattern was claimed to be a necessary response to the decreased North Atlantic heat piracy during periods of weak AMOC. However, the thermal evolution of the western South Atlantic and the adjacent continent is so far largely unknown. Here we address this issue, presenting high-temporal-resolution SST and MAT records from the BC and southeastern South America, respectively. We identify a warming in the western South Atlantic during Heinrich Stadial 1 (HS1), which is followed first by a drop and then by increasing temperatures during the Bølling–Allerød, in phase with an existing SST record from the NBC. Additionally, a similar SST evolution is shown by a southernmost eastern South Atlantic record, suggesting a South Atlantic-wide pattern in SST evolution during most of Termination 1. Over southeastern South America, our MAT record shows a two-step increase during Termination 1, synchronous with atmospheric CO2 rise (i.e., during the second half of HS1 and during the Younger Dryas), and lagging abrupt SST changes by several thousand years. This delay corroborates the notion that the long duration of HS1 was fundamental in driving the Earth out of the last glacial. |
| title | Stable oxygen isotope and Mg/Ca data of Globigerinoides ruber white, water stable oxygen isotope data, SST and MAT records of sediment core GeoB6211-2 |
| topic | AGE; Argentine Basin; Calculated, according to Anand et al. (2003); Calculated from MBT'/CBT (Peterse et al., 2012); calibrated; Center for Marine Environmental Sciences; DEPTH, sediment/rock; GeoB6211-2; Globigerinoides ruber white, Magnesium/Calcium ratio; Globigerinoides ruber white, δ18O; Gravity corer (Kiel type); Ice volume corrected; ICP-OES, Inductively coupled plasma - optical emission spectrometry; Isotope ratio mass spectrometry; M46/2; MARUM; Meteor (1986); Sea surface temperature; SL; Temperature, annual mean; δ18O, water |
| url | https://doi.org/10.1594/PANGAEA.847352 |