A multiple proxy and model study of Cretaceous upper ocean temperatures and atmospheric CO2 concentrations
Author Posting. © American Geophysical Union, 2006. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 21 (2206): PA2002, doi:10.1029/2005PA001203. We estimate tropical Atlantic up...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/846 2023-05-15T17:36:11+02:00 A multiple proxy and model study of Cretaceous upper ocean temperatures and atmospheric CO2 concentrations Bice, Karen L. Birgel, Daniel Meyers, Philip A. Dahl, Kristina A. Hinrichs, Kai-Uwe Norris, Richard D. 2006-04-08 633404 bytes application/pdf https://hdl.handle.net/1912/846 en_US eng American Geophysical Union https://doi.org/10.1029/2005PA001203 Paleoceanography 21 (2006): PA2002 https://hdl.handle.net/1912/846 doi:10.1029/2005PA001203 Paleoceanography 21 (2006): PA2002 doi:10.1029/2005PA001203 Cretaceous Temperature Carbon dioxide Article 2006 ftwhoas https://doi.org/10.1029/2005PA001203 2022-05-28T22:57:01Z Author Posting. © American Geophysical Union, 2006. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 21 (2206): PA2002, doi:10.1029/2005PA001203. We estimate tropical Atlantic upper ocean temperatures using oxygen isotope and Mg/Ca ratios in well-preserved planktonic foraminifera extracted from Albian through Santonian black shales recovered during Ocean Drilling Program Leg 207 (North Atlantic Demerara Rise). On the basis of a range of plausible assumptions regarding seawater composition at the time the data support temperatures between 33° and 42°C. In our low-resolution data set spanning ~84–100 Ma a local temperature maximum occurs in the late Turonian, and a possible minimum occurs in the mid to early late Cenomanian. The relation between single species foraminiferal δ18O and Mg/Ca suggests that the ratio of magnesium to calcium in the Turonian-Coniacian ocean may have been lower than in the Albian-Cenomanian ocean, perhaps coincident with an ocean 87Sr/86Sr minimum. The carbon isotopic compositions of distinct marine algal biomarkers were measured in the same sediment samples. The δ13C values of phytane, combined with foraminiferal δ13C and inferred temperatures, were used to estimate atmospheric carbon dioxide concentrations through this interval. Estimates of atmospheric CO2 concentrations range between 600 and 2400 ppmv. Within the uncertainty in the various proxies, there is only a weak overall correspondence between higher (lower) tropical temperatures and more (less) atmospheric CO2. The GENESIS climate model underpredicts tropical Atlantic temperatures inferred from ODP Leg 207 foraminiferal δ18O and Mg/Ca when we specify approximate CO2 concentrations estimated from the biomarker isotopes in the same samples. Possible errors in the temperature and CO2 estimates and possible deficiencies in the model are discussed. The potential for and effects of substantially higher ... Article in Journal/Newspaper North Atlantic Planktonic foraminifera Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Paleoceanography 21 2 n/a n/a |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Cretaceous Temperature Carbon dioxide |
spellingShingle |
Cretaceous Temperature Carbon dioxide Bice, Karen L. Birgel, Daniel Meyers, Philip A. Dahl, Kristina A. Hinrichs, Kai-Uwe Norris, Richard D. A multiple proxy and model study of Cretaceous upper ocean temperatures and atmospheric CO2 concentrations |
topic_facet |
Cretaceous Temperature Carbon dioxide |
description |
Author Posting. © American Geophysical Union, 2006. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 21 (2206): PA2002, doi:10.1029/2005PA001203. We estimate tropical Atlantic upper ocean temperatures using oxygen isotope and Mg/Ca ratios in well-preserved planktonic foraminifera extracted from Albian through Santonian black shales recovered during Ocean Drilling Program Leg 207 (North Atlantic Demerara Rise). On the basis of a range of plausible assumptions regarding seawater composition at the time the data support temperatures between 33° and 42°C. In our low-resolution data set spanning ~84–100 Ma a local temperature maximum occurs in the late Turonian, and a possible minimum occurs in the mid to early late Cenomanian. The relation between single species foraminiferal δ18O and Mg/Ca suggests that the ratio of magnesium to calcium in the Turonian-Coniacian ocean may have been lower than in the Albian-Cenomanian ocean, perhaps coincident with an ocean 87Sr/86Sr minimum. The carbon isotopic compositions of distinct marine algal biomarkers were measured in the same sediment samples. The δ13C values of phytane, combined with foraminiferal δ13C and inferred temperatures, were used to estimate atmospheric carbon dioxide concentrations through this interval. Estimates of atmospheric CO2 concentrations range between 600 and 2400 ppmv. Within the uncertainty in the various proxies, there is only a weak overall correspondence between higher (lower) tropical temperatures and more (less) atmospheric CO2. The GENESIS climate model underpredicts tropical Atlantic temperatures inferred from ODP Leg 207 foraminiferal δ18O and Mg/Ca when we specify approximate CO2 concentrations estimated from the biomarker isotopes in the same samples. Possible errors in the temperature and CO2 estimates and possible deficiencies in the model are discussed. The potential for and effects of substantially higher ... |
format |
Article in Journal/Newspaper |
author |
Bice, Karen L. Birgel, Daniel Meyers, Philip A. Dahl, Kristina A. Hinrichs, Kai-Uwe Norris, Richard D. |
author_facet |
Bice, Karen L. Birgel, Daniel Meyers, Philip A. Dahl, Kristina A. Hinrichs, Kai-Uwe Norris, Richard D. |
author_sort |
Bice, Karen L. |
title |
A multiple proxy and model study of Cretaceous upper ocean temperatures and atmospheric CO2 concentrations |
title_short |
A multiple proxy and model study of Cretaceous upper ocean temperatures and atmospheric CO2 concentrations |
title_full |
A multiple proxy and model study of Cretaceous upper ocean temperatures and atmospheric CO2 concentrations |
title_fullStr |
A multiple proxy and model study of Cretaceous upper ocean temperatures and atmospheric CO2 concentrations |
title_full_unstemmed |
A multiple proxy and model study of Cretaceous upper ocean temperatures and atmospheric CO2 concentrations |
title_sort |
multiple proxy and model study of cretaceous upper ocean temperatures and atmospheric co2 concentrations |
publisher |
American Geophysical Union |
publishDate |
2006 |
url |
https://hdl.handle.net/1912/846 |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_source |
Paleoceanography 21 (2006): PA2002 doi:10.1029/2005PA001203 |
op_relation |
https://doi.org/10.1029/2005PA001203 Paleoceanography 21 (2006): PA2002 https://hdl.handle.net/1912/846 doi:10.1029/2005PA001203 |
op_doi |
https://doi.org/10.1029/2005PA001203 |
container_title |
Paleoceanography |
container_volume |
21 |
container_issue |
2 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1766135586672869376 |