Isotopically Depleted Carbon in the Mid-Depth South Atlantic During the Last Deglaciation
The initial rise in atmospheric CO2 during the last deglaciation was likely driven by input of carbon from a 13C-depleted reservoir (Schmitt et al., 2012). Here we show that high resolution benthic foraminiferal records from the mid‐depth Brazil Margin display an abrupt drop in δ13C during Heinrich...
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ftumdeepblue:oai:deepblue.lib.umich.edu:2027.42/98090 2023-08-20T04:08:24+02:00 Isotopically Depleted Carbon in the Mid-Depth South Atlantic During the Last Deglaciation Tessin, Allyson Geological Sciences, Department of Earth and Enviromental Sciences, Department of Ann Arbor 2013-06-14 application/pdf https://hdl.handle.net/2027.42/98090 en_US eng Wiley American Geophysical Union 10.1002/palo.20026 (2013) https://hdl.handle.net/2027.42/98090 24355905 Paleoceanography Geological Sciences Science Article 2013 ftumdeepblue 2023-07-31T20:44:34Z The initial rise in atmospheric CO2 during the last deglaciation was likely driven by input of carbon from a 13C-depleted reservoir (Schmitt et al., 2012). Here we show that high resolution benthic foraminiferal records from the mid‐depth Brazil Margin display an abrupt drop in δ13C during Heinrich Stadial 1 (HS1) that is similar to but larger than in the atmosphere. Comparing the Brazil Margin results to published records from the North Atlantic, we are unable to account for the South Atlantic δ13C data with conservative mixing between northern and southern component watermasses. Rapid input of abyssal water from the Southeast Atlantic could account for deglacial δ13C anomalies at the Brazil Margin but it would require a reversal in deep water flow direction compared to today. A new mid-depth watermass may explain similar HS1 δ13C values in both the North and South Atlantic, but contrasting oxygen isotopic values between the two basins do not support the presence of a single dominant watermass at mid‐depths. Instead, it appears that δ13C behaved non-conservatively during the deglaciation, possibly reflecting the input of carbon from an isotopically depleted source. NSF Peer Reviewed http://deepblue.lib.umich.edu/bitstream/2027.42/98090/1/Tessin_Allyson_MS_2013.pdf 13 Article in Journal/Newspaper North Atlantic University of Michigan: Deep Blue |
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University of Michigan: Deep Blue |
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ftumdeepblue |
language |
English |
topic |
Geological Sciences Science |
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Geological Sciences Science Tessin, Allyson Isotopically Depleted Carbon in the Mid-Depth South Atlantic During the Last Deglaciation |
topic_facet |
Geological Sciences Science |
description |
The initial rise in atmospheric CO2 during the last deglaciation was likely driven by input of carbon from a 13C-depleted reservoir (Schmitt et al., 2012). Here we show that high resolution benthic foraminiferal records from the mid‐depth Brazil Margin display an abrupt drop in δ13C during Heinrich Stadial 1 (HS1) that is similar to but larger than in the atmosphere. Comparing the Brazil Margin results to published records from the North Atlantic, we are unable to account for the South Atlantic δ13C data with conservative mixing between northern and southern component watermasses. Rapid input of abyssal water from the Southeast Atlantic could account for deglacial δ13C anomalies at the Brazil Margin but it would require a reversal in deep water flow direction compared to today. A new mid-depth watermass may explain similar HS1 δ13C values in both the North and South Atlantic, but contrasting oxygen isotopic values between the two basins do not support the presence of a single dominant watermass at mid‐depths. Instead, it appears that δ13C behaved non-conservatively during the deglaciation, possibly reflecting the input of carbon from an isotopically depleted source. NSF Peer Reviewed http://deepblue.lib.umich.edu/bitstream/2027.42/98090/1/Tessin_Allyson_MS_2013.pdf 13 |
author2 |
Geological Sciences, Department of Earth and Enviromental Sciences, Department of Ann Arbor |
format |
Article in Journal/Newspaper |
author |
Tessin, Allyson |
author_facet |
Tessin, Allyson |
author_sort |
Tessin, Allyson |
title |
Isotopically Depleted Carbon in the Mid-Depth South Atlantic During the Last Deglaciation |
title_short |
Isotopically Depleted Carbon in the Mid-Depth South Atlantic During the Last Deglaciation |
title_full |
Isotopically Depleted Carbon in the Mid-Depth South Atlantic During the Last Deglaciation |
title_fullStr |
Isotopically Depleted Carbon in the Mid-Depth South Atlantic During the Last Deglaciation |
title_full_unstemmed |
Isotopically Depleted Carbon in the Mid-Depth South Atlantic During the Last Deglaciation |
title_sort |
isotopically depleted carbon in the mid-depth south atlantic during the last deglaciation |
publisher |
Wiley American Geophysical Union |
publishDate |
2013 |
url |
https://hdl.handle.net/2027.42/98090 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
10.1002/palo.20026 (2013) https://hdl.handle.net/2027.42/98090 24355905 Paleoceanography |
_version_ |
1774720649563996160 |