Age model, sedimentation rates and stable carbon isotopic rates of sediment core GeoB6212-1
Abrupt millennial-scale climate change events of the last deglaciation (i.e. Heinrich Stadial 1 and the Younger Dryas) were accompanied by marked increases in atmospheric CO2 (CO2atm) and decreases in its stable carbon isotopic ratios (d13C), i.e. d13CO2atm, presumably due to outgassing from the oce...
Main Authors: | , , , , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2017
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.874350 https://doi.org/10.1594/PANGAEA.874350 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.874350 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.874350 2024-05-19T07:45:22+00:00 Age model, sedimentation rates and stable carbon isotopic rates of sediment core GeoB6212-1 de Carvalho Campos, Marília Chiessi, Cristiano Mazur Voigt, Ines Piola, Alberto R Kuhnert, Henning Mulitza, Stefan LATITUDE: -32.686500 * LONGITUDE: -50.109000 * DATE/TIME START: 1999-12-12T20:35:00 * DATE/TIME END: 1999-12-12T20:35:00 2017 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.874350 https://doi.org/10.1594/PANGAEA.874350 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.874350 https://doi.org/10.1594/PANGAEA.874350 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: de Carvalho Campos, Marília; Chiessi, Cristiano Mazur; Voigt, Ines; Piola, Alberto R; Kuhnert, Henning; Mulitza, Stefan (2017): d13C decreases in the upper western South Atlantic during Heinrich Stadials 3 and 2. Climate of the Past, 13, 345-358, https://doi.org/10.5194/cp-13-345-2017 Center for Marine Environmental Sciences GeoB Geosciences University of Bremen MARUM Dataset 2017 ftpangaea https://doi.org/10.1594/PANGAEA.87435010.5194/cp-13-345-2017 2024-04-30T23:34:34Z Abrupt millennial-scale climate change events of the last deglaciation (i.e. Heinrich Stadial 1 and the Younger Dryas) were accompanied by marked increases in atmospheric CO2 (CO2atm) and decreases in its stable carbon isotopic ratios (d13C), i.e. d13CO2atm, presumably due to outgassing from the ocean. However, information on the preceding Heinrich Stadials during the last glacial period is scarce. Here we present d13C records from two species of planktonic foraminifera from the western South Atlantic that reveal major decreases (up to 1 per mil) during Heinrich Stadials 3 and 2. These d13C decreases are most likely related to millennialscale periods of weakening of the Atlantic meridional overturning circulation and the consequent increase (decrease) in CO2atm (d13CO2atm). We hypothesise two mechanisms that could account for the decreases observed in our records, namely strengthening of Southern Ocean deep-water ventilation and weakening of the biological pump. Additionally, we suggest that air?sea gas exchange could have contributed to the observed d13C decreases. Together with other lines of evidence, our data are consistent with the hypothesis that the CO2 added to the atmosphere during abrupt millennial-scale climate change events of the last glacial period also originated in the ocean and reached the atmosphere by outgassing. The temporal evolution of d13C during Heinrich Stadials 3 and 2 in our records is characterized by two relative minima separated by a relative maximum. This ?w structure? is also found in North Atlantic and South American records, further suggesting that such a structure is a pervasive feature of Heinrich Stadial 2 and, possibly, also Heinrich Stadial 3. Dataset North Atlantic Planktonic foraminifera Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-50.109000,-50.109000,-32.686500,-32.686500) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Center for Marine Environmental Sciences GeoB Geosciences University of Bremen MARUM |
spellingShingle |
Center for Marine Environmental Sciences GeoB Geosciences University of Bremen MARUM de Carvalho Campos, Marília Chiessi, Cristiano Mazur Voigt, Ines Piola, Alberto R Kuhnert, Henning Mulitza, Stefan Age model, sedimentation rates and stable carbon isotopic rates of sediment core GeoB6212-1 |
topic_facet |
Center for Marine Environmental Sciences GeoB Geosciences University of Bremen MARUM |
description |
Abrupt millennial-scale climate change events of the last deglaciation (i.e. Heinrich Stadial 1 and the Younger Dryas) were accompanied by marked increases in atmospheric CO2 (CO2atm) and decreases in its stable carbon isotopic ratios (d13C), i.e. d13CO2atm, presumably due to outgassing from the ocean. However, information on the preceding Heinrich Stadials during the last glacial period is scarce. Here we present d13C records from two species of planktonic foraminifera from the western South Atlantic that reveal major decreases (up to 1 per mil) during Heinrich Stadials 3 and 2. These d13C decreases are most likely related to millennialscale periods of weakening of the Atlantic meridional overturning circulation and the consequent increase (decrease) in CO2atm (d13CO2atm). We hypothesise two mechanisms that could account for the decreases observed in our records, namely strengthening of Southern Ocean deep-water ventilation and weakening of the biological pump. Additionally, we suggest that air?sea gas exchange could have contributed to the observed d13C decreases. Together with other lines of evidence, our data are consistent with the hypothesis that the CO2 added to the atmosphere during abrupt millennial-scale climate change events of the last glacial period also originated in the ocean and reached the atmosphere by outgassing. The temporal evolution of d13C during Heinrich Stadials 3 and 2 in our records is characterized by two relative minima separated by a relative maximum. This ?w structure? is also found in North Atlantic and South American records, further suggesting that such a structure is a pervasive feature of Heinrich Stadial 2 and, possibly, also Heinrich Stadial 3. |
format |
Dataset |
author |
de Carvalho Campos, Marília Chiessi, Cristiano Mazur Voigt, Ines Piola, Alberto R Kuhnert, Henning Mulitza, Stefan |
author_facet |
de Carvalho Campos, Marília Chiessi, Cristiano Mazur Voigt, Ines Piola, Alberto R Kuhnert, Henning Mulitza, Stefan |
author_sort |
de Carvalho Campos, Marília |
title |
Age model, sedimentation rates and stable carbon isotopic rates of sediment core GeoB6212-1 |
title_short |
Age model, sedimentation rates and stable carbon isotopic rates of sediment core GeoB6212-1 |
title_full |
Age model, sedimentation rates and stable carbon isotopic rates of sediment core GeoB6212-1 |
title_fullStr |
Age model, sedimentation rates and stable carbon isotopic rates of sediment core GeoB6212-1 |
title_full_unstemmed |
Age model, sedimentation rates and stable carbon isotopic rates of sediment core GeoB6212-1 |
title_sort |
age model, sedimentation rates and stable carbon isotopic rates of sediment core geob6212-1 |
publisher |
PANGAEA |
publishDate |
2017 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.874350 https://doi.org/10.1594/PANGAEA.874350 |
op_coverage |
LATITUDE: -32.686500 * LONGITUDE: -50.109000 * DATE/TIME START: 1999-12-12T20:35:00 * DATE/TIME END: 1999-12-12T20:35:00 |
long_lat |
ENVELOPE(-50.109000,-50.109000,-32.686500,-32.686500) |
genre |
North Atlantic Planktonic foraminifera Southern Ocean |
genre_facet |
North Atlantic Planktonic foraminifera Southern Ocean |
op_source |
Supplement to: de Carvalho Campos, Marília; Chiessi, Cristiano Mazur; Voigt, Ines; Piola, Alberto R; Kuhnert, Henning; Mulitza, Stefan (2017): d13C decreases in the upper western South Atlantic during Heinrich Stadials 3 and 2. Climate of the Past, 13, 345-358, https://doi.org/10.5194/cp-13-345-2017 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.874350 https://doi.org/10.1594/PANGAEA.874350 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.87435010.5194/cp-13-345-2017 |
_version_ |
1799485385176252416 |