Southwest Pacific Ocean response to a warming world: Using Mg/Ca, Zn/Ca, and Mn/Ca in foraminifera to track surface ocean water masses during the last deglaciation
In situ measurements of Mg/Ca, Zn/Ca, Mn/Ca, and Ba/Ca in Globigerinoides bulloides and Globigerina ruber from southwest Pacific core top sites and plankton tow are reported and their potential as paleoproxies is explored. The modern samples cover 20 degrees of latitude from 34 degrees S to 54 degre...
Published in: | Paleoceanography |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley-Blackwell
2013
|
Subjects: | |
Online Access: | https://espace.library.uq.edu.au/view/UQ:d06ddb8/thumbnail_UQd06ddb8_OA_t.jpg https://espace.library.uq.edu.au/view/UQ:d06ddb8/UQd06ddb8_OA.pdf https://espace.library.uq.edu.au/view/UQ:d06ddb8 |
id |
ftunivqespace:oai:espace.library.uq.edu.au:UQ:d06ddb8 |
---|---|
record_format |
openpolar |
spelling |
ftunivqespace:oai:espace.library.uq.edu.au:UQ:d06ddb8 2023-05-15T13:42:01+02:00 Southwest Pacific Ocean response to a warming world: Using Mg/Ca, Zn/Ca, and Mn/Ca in foraminifera to track surface ocean water masses during the last deglaciation Marr, Julene P. Carter, Lionel Bostock, Helen C. Bolton, Annette Smith, Euan 2013-06-01 https://espace.library.uq.edu.au/view/UQ:d06ddb8/thumbnail_UQd06ddb8_OA_t.jpg https://espace.library.uq.edu.au/view/UQ:d06ddb8/UQd06ddb8_OA.pdf https://espace.library.uq.edu.au/view/UQ:d06ddb8 eng eng Wiley-Blackwell doi:10.1002/palo.20032 issn:0883-8305 orcid:0000-0002-8903-8958 New-Zealand Planktonic-Foraminifera Climate-Change Physical Oceanography Subtropical Front Southern-Ocean Variability Temperature Barium Sea 1910 Oceanography 1911 Palaeontology Journal Article 2013 ftunivqespace https://doi.org/10.1002/palo.20032 2020-12-22T15:25:09Z In situ measurements of Mg/Ca, Zn/Ca, Mn/Ca, and Ba/Ca in Globigerinoides bulloides and Globigerina ruber from southwest Pacific core top sites and plankton tow are reported and their potential as paleoproxies is explored. The modern samples cover 20 degrees of latitude from 34 degrees S to 54 degrees S, 7-19 degrees C water temperature, and variable influence of subantarctic (SAW) and subtropical (STW) surface waters. Trace element signatures recorded in core top and plankton tow planktic foraminifera are examined in the context of the chemistry and nutrient profiles of their modern water masses. Our observations suggest that Zn/Ca and Mn/Ca may have the potential to trace SAW and STW. Intraspecies and interspecies offsets identified by in situ measurements of Mg/Ca and Zn/Ca indicate that these ratios may also record changes in thermal and nutrient stratification in the upper ocean. We apply these potential proxies to fossilized foraminifera from the high-resolution core MD97 2121. At the Last Glacial Maximum, surface water Mg/Ca temperature estimates indicate that temperatures were approximately 6-7 degrees C lower than those of the present, accompanied by low levels of Mn/Ca and Zn/Ca and minimal thermal and nutrient stratification. This is consistent with regional dominance of SAW and reduced STW inflow associated with a reduced South Pacific Gyre (SPG). Upper ocean thermal and nutrient stratification collapsed during the Antarctic Cold Reversal, before poleward migration of the zonal winds and ocean fronts invigorated the SPG and increased STW inflow in the early Holocene. Together with reduced winds, this favored a stratified upper ocean from circa 10ka to the present. Article in Journal/Newspaper Antarc* Antarctic Planktonic foraminifera Southern Ocean The University of Queensland: UQ eSpace Antarctic Southern Ocean The Antarctic Pacific New Zealand Paleoceanography 28 2 347 362 |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
New-Zealand Planktonic-Foraminifera Climate-Change Physical Oceanography Subtropical Front Southern-Ocean Variability Temperature Barium Sea 1910 Oceanography 1911 Palaeontology |
spellingShingle |
New-Zealand Planktonic-Foraminifera Climate-Change Physical Oceanography Subtropical Front Southern-Ocean Variability Temperature Barium Sea 1910 Oceanography 1911 Palaeontology Marr, Julene P. Carter, Lionel Bostock, Helen C. Bolton, Annette Smith, Euan Southwest Pacific Ocean response to a warming world: Using Mg/Ca, Zn/Ca, and Mn/Ca in foraminifera to track surface ocean water masses during the last deglaciation |
topic_facet |
New-Zealand Planktonic-Foraminifera Climate-Change Physical Oceanography Subtropical Front Southern-Ocean Variability Temperature Barium Sea 1910 Oceanography 1911 Palaeontology |
description |
In situ measurements of Mg/Ca, Zn/Ca, Mn/Ca, and Ba/Ca in Globigerinoides bulloides and Globigerina ruber from southwest Pacific core top sites and plankton tow are reported and their potential as paleoproxies is explored. The modern samples cover 20 degrees of latitude from 34 degrees S to 54 degrees S, 7-19 degrees C water temperature, and variable influence of subantarctic (SAW) and subtropical (STW) surface waters. Trace element signatures recorded in core top and plankton tow planktic foraminifera are examined in the context of the chemistry and nutrient profiles of their modern water masses. Our observations suggest that Zn/Ca and Mn/Ca may have the potential to trace SAW and STW. Intraspecies and interspecies offsets identified by in situ measurements of Mg/Ca and Zn/Ca indicate that these ratios may also record changes in thermal and nutrient stratification in the upper ocean. We apply these potential proxies to fossilized foraminifera from the high-resolution core MD97 2121. At the Last Glacial Maximum, surface water Mg/Ca temperature estimates indicate that temperatures were approximately 6-7 degrees C lower than those of the present, accompanied by low levels of Mn/Ca and Zn/Ca and minimal thermal and nutrient stratification. This is consistent with regional dominance of SAW and reduced STW inflow associated with a reduced South Pacific Gyre (SPG). Upper ocean thermal and nutrient stratification collapsed during the Antarctic Cold Reversal, before poleward migration of the zonal winds and ocean fronts invigorated the SPG and increased STW inflow in the early Holocene. Together with reduced winds, this favored a stratified upper ocean from circa 10ka to the present. |
format |
Article in Journal/Newspaper |
author |
Marr, Julene P. Carter, Lionel Bostock, Helen C. Bolton, Annette Smith, Euan |
author_facet |
Marr, Julene P. Carter, Lionel Bostock, Helen C. Bolton, Annette Smith, Euan |
author_sort |
Marr, Julene P. |
title |
Southwest Pacific Ocean response to a warming world: Using Mg/Ca, Zn/Ca, and Mn/Ca in foraminifera to track surface ocean water masses during the last deglaciation |
title_short |
Southwest Pacific Ocean response to a warming world: Using Mg/Ca, Zn/Ca, and Mn/Ca in foraminifera to track surface ocean water masses during the last deglaciation |
title_full |
Southwest Pacific Ocean response to a warming world: Using Mg/Ca, Zn/Ca, and Mn/Ca in foraminifera to track surface ocean water masses during the last deglaciation |
title_fullStr |
Southwest Pacific Ocean response to a warming world: Using Mg/Ca, Zn/Ca, and Mn/Ca in foraminifera to track surface ocean water masses during the last deglaciation |
title_full_unstemmed |
Southwest Pacific Ocean response to a warming world: Using Mg/Ca, Zn/Ca, and Mn/Ca in foraminifera to track surface ocean water masses during the last deglaciation |
title_sort |
southwest pacific ocean response to a warming world: using mg/ca, zn/ca, and mn/ca in foraminifera to track surface ocean water masses during the last deglaciation |
publisher |
Wiley-Blackwell |
publishDate |
2013 |
url |
https://espace.library.uq.edu.au/view/UQ:d06ddb8/thumbnail_UQd06ddb8_OA_t.jpg https://espace.library.uq.edu.au/view/UQ:d06ddb8/UQd06ddb8_OA.pdf https://espace.library.uq.edu.au/view/UQ:d06ddb8 |
geographic |
Antarctic Southern Ocean The Antarctic Pacific New Zealand |
geographic_facet |
Antarctic Southern Ocean The Antarctic Pacific New Zealand |
genre |
Antarc* Antarctic Planktonic foraminifera Southern Ocean |
genre_facet |
Antarc* Antarctic Planktonic foraminifera Southern Ocean |
op_relation |
doi:10.1002/palo.20032 issn:0883-8305 orcid:0000-0002-8903-8958 |
op_doi |
https://doi.org/10.1002/palo.20032 |
container_title |
Paleoceanography |
container_volume |
28 |
container_issue |
2 |
container_start_page |
347 |
op_container_end_page |
362 |
_version_ |
1766161846863134720 |