A 1400-year multi-proxy record of climate variability from the northern Gulf of Mexico
A continuous, decadal-scale resolution multi-proxy record of climate variability over the past 1400 years in the northern Gulf of Mexico (GOM) was constructed from a box core recovered in the Pigmy Basin. Proxies include paired analyses of Mg/Ca and oxygen isotopes in the white variety of the plankt...
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ftunisfloridatam:oai:digitalcommons.usf.edu:etd-3337 2023-06-11T04:12:42+02:00 A 1400-year multi-proxy record of climate variability from the northern Gulf of Mexico Richey, Julie N 2007-06-01T07:00:00Z application/pdf https://digitalcommons.usf.edu/etd/2338 https://digitalcommons.usf.edu/context/etd/article/3337/viewcontent/SFE0001950.pdf unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/etd/2338 https://digitalcommons.usf.edu/context/etd/article/3337/viewcontent/SFE0001950.pdf default USF Tampa Graduate Theses and Dissertations Little Ice Age Medieval warm period Foraminifera Climate change Holocene American Studies Arts and Humanities thesis 2007 ftunisfloridatam 2023-05-04T18:01:10Z A continuous, decadal-scale resolution multi-proxy record of climate variability over the past 1400 years in the northern Gulf of Mexico (GOM) was constructed from a box core recovered in the Pigmy Basin. Proxies include paired analyses of Mg/Ca and oxygen isotopes in the white variety of the planktic foraminifer Globigerinoides ruber and relative abundance variations of G. sacculifer in the foraminifer assemblages. Two multi-decadal intervals of sustained high Mg/Ca values indicate GOM sea-surface temperatures (SSTs) were as warm or warmer than near-modern conditions between 1000 and 1400 yrs BP. Foraminiferal Mg/Ca values during the coolest interval of the Little Ice Age (ca. 250 yrs BP) indicate that SST was 2 - 2.5 degrees Celcius below modern SST. Four minima in the Mg/Ca record between 900 and 250 yrs BP correspond with the Maunder, Spörer, Wolf and Oort sunspot minima, suggesting a link between solar insolation and SST variability in the GOM. An abrupt shift recorded in both the oxygen isotopic ratio of calcite and relative abundance of G. sacculifer occurs ~600 yrs BP. The shift in the Pigmy Basin record corresponds with a shift in the sea-salt-sodium (ssNa) record from the GISP2 ice core, linking changes in high-latitude atmospheric circulation with the subtropical Atlantic Ocean. Thesis ice core Digital Commons University of South Florida (USF) |
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Digital Commons University of South Florida (USF) |
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ftunisfloridatam |
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topic |
Little Ice Age Medieval warm period Foraminifera Climate change Holocene American Studies Arts and Humanities |
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Little Ice Age Medieval warm period Foraminifera Climate change Holocene American Studies Arts and Humanities Richey, Julie N A 1400-year multi-proxy record of climate variability from the northern Gulf of Mexico |
topic_facet |
Little Ice Age Medieval warm period Foraminifera Climate change Holocene American Studies Arts and Humanities |
description |
A continuous, decadal-scale resolution multi-proxy record of climate variability over the past 1400 years in the northern Gulf of Mexico (GOM) was constructed from a box core recovered in the Pigmy Basin. Proxies include paired analyses of Mg/Ca and oxygen isotopes in the white variety of the planktic foraminifer Globigerinoides ruber and relative abundance variations of G. sacculifer in the foraminifer assemblages. Two multi-decadal intervals of sustained high Mg/Ca values indicate GOM sea-surface temperatures (SSTs) were as warm or warmer than near-modern conditions between 1000 and 1400 yrs BP. Foraminiferal Mg/Ca values during the coolest interval of the Little Ice Age (ca. 250 yrs BP) indicate that SST was 2 - 2.5 degrees Celcius below modern SST. Four minima in the Mg/Ca record between 900 and 250 yrs BP correspond with the Maunder, Spörer, Wolf and Oort sunspot minima, suggesting a link between solar insolation and SST variability in the GOM. An abrupt shift recorded in both the oxygen isotopic ratio of calcite and relative abundance of G. sacculifer occurs ~600 yrs BP. The shift in the Pigmy Basin record corresponds with a shift in the sea-salt-sodium (ssNa) record from the GISP2 ice core, linking changes in high-latitude atmospheric circulation with the subtropical Atlantic Ocean. |
format |
Thesis |
author |
Richey, Julie N |
author_facet |
Richey, Julie N |
author_sort |
Richey, Julie N |
title |
A 1400-year multi-proxy record of climate variability from the northern Gulf of Mexico |
title_short |
A 1400-year multi-proxy record of climate variability from the northern Gulf of Mexico |
title_full |
A 1400-year multi-proxy record of climate variability from the northern Gulf of Mexico |
title_fullStr |
A 1400-year multi-proxy record of climate variability from the northern Gulf of Mexico |
title_full_unstemmed |
A 1400-year multi-proxy record of climate variability from the northern Gulf of Mexico |
title_sort |
1400-year multi-proxy record of climate variability from the northern gulf of mexico |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2007 |
url |
https://digitalcommons.usf.edu/etd/2338 https://digitalcommons.usf.edu/context/etd/article/3337/viewcontent/SFE0001950.pdf |
genre |
ice core |
genre_facet |
ice core |
op_source |
USF Tampa Graduate Theses and Dissertations |
op_relation |
https://digitalcommons.usf.edu/etd/2338 https://digitalcommons.usf.edu/context/etd/article/3337/viewcontent/SFE0001950.pdf |
op_rights |
default |
_version_ |
1768388727855382528 |