Sub-Centennial Scale Climatic and Hydrologic Variability in the Gulf of Mexico during the Early Holocene
Sediment core MD02-2550 from Orca Basin located in the northern Gulf of Mexico (GOM) provides a high-resolution early Holocene record of climatic and hydrologic changes from ~10.5 to 7 thousand calendar years before present (ka). Paired analyses of Mg/Ca and δ18O on the planktonic foraminifer Globig...
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ftunisfloridatam:oai:digitalcommons.usf.edu:etd-5063 2023-06-11T04:12:21+02:00 Sub-Centennial Scale Climatic and Hydrologic Variability in the Gulf of Mexico during the Early Holocene LoDico, Jenna Meredith 2006-01-20T08:00:00Z application/pdf https://digitalcommons.usf.edu/etd/3867 https://digitalcommons.usf.edu/context/etd/article/5063/viewcontent/Sub_centennial_scale_climatic_and_hydrologic_variability_in_the_Gulf_of_Mexico_during_the_early_Holocene.pdf unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/etd/3867 https://digitalcommons.usf.edu/context/etd/article/5063/viewcontent/Sub_centennial_scale_climatic_and_hydrologic_variability_in_the_Gulf_of_Mexico_during_the_early_Holocene.pdf default USF Tampa Graduate Theses and Dissertations climate change sea surface temperature variability freshwater floods American Studies Arts and Humanities thesis 2006 ftunisfloridatam 2023-05-04T18:02:56Z Sediment core MD02-2550 from Orca Basin located in the northern Gulf of Mexico (GOM) provides a high-resolution early Holocene record of climatic and hydrologic changes from ~10.5 to 7 thousand calendar years before present (ka). Paired analyses of Mg/Ca and δ18O on the planktonic foraminifer Globigerinoides ruber (white variety, 250-355 µm) sampled at ~ 20 year resolution were used to generate proxy records of sea surface temperature (SST) and the δ18O of seawater in the GOM (δ18OGOM). The Mg/Ca-SST record contains an overall ~1.5 °C warming trend from 10.5 to 7 ka that appears to track the intensity of the annual insolation cycle and six temperature oscillations (0.5-2 °C), the frequency of which are consistent with those found in records of solar variability. The δ18OGOM record contains six ~ 0.5 ‰ oscillations from 10.5 to 7 ka that bear some resemblance to regional hydrologic records from Haiti and the Cariaco Basin, plus a -0.8 ‰ excursion that may be associated with the “8.2 ka event” recorded in Greenland air temperatures. The δ18OGOM record, if interpreted as a salinity proxy, suggest large salinity fluctuations (> 2 ‰) reflecting changes in evaporation-precipitation (E-P) and Mississippi River input to the GOM. Percent Globigerinoides sacculifer records from three cores in the GOM exhibit remarkably coherent changes, suggesting episodic v centennial-scale incursions of Caribbean waters. Spectral analysis of the Mg/Ca-SST and the δ18OGOM time series indicate that surface water conditions may be influenced by solar variations because they share significant periods of variability with atmospheric ∆ 14C near 700, 200, and 80-70 years. Our results add to the growing body of evidence that the sub-tropics were characterized by significant decadal to centennial-scale climatic and hydrologic variability during the early Holocene. Thesis Greenland Orca Digital Commons University of South Florida (USF) Greenland |
institution |
Open Polar |
collection |
Digital Commons University of South Florida (USF) |
op_collection_id |
ftunisfloridatam |
language |
unknown |
topic |
climate change sea surface temperature variability freshwater floods American Studies Arts and Humanities |
spellingShingle |
climate change sea surface temperature variability freshwater floods American Studies Arts and Humanities LoDico, Jenna Meredith Sub-Centennial Scale Climatic and Hydrologic Variability in the Gulf of Mexico during the Early Holocene |
topic_facet |
climate change sea surface temperature variability freshwater floods American Studies Arts and Humanities |
description |
Sediment core MD02-2550 from Orca Basin located in the northern Gulf of Mexico (GOM) provides a high-resolution early Holocene record of climatic and hydrologic changes from ~10.5 to 7 thousand calendar years before present (ka). Paired analyses of Mg/Ca and δ18O on the planktonic foraminifer Globigerinoides ruber (white variety, 250-355 µm) sampled at ~ 20 year resolution were used to generate proxy records of sea surface temperature (SST) and the δ18O of seawater in the GOM (δ18OGOM). The Mg/Ca-SST record contains an overall ~1.5 °C warming trend from 10.5 to 7 ka that appears to track the intensity of the annual insolation cycle and six temperature oscillations (0.5-2 °C), the frequency of which are consistent with those found in records of solar variability. The δ18OGOM record contains six ~ 0.5 ‰ oscillations from 10.5 to 7 ka that bear some resemblance to regional hydrologic records from Haiti and the Cariaco Basin, plus a -0.8 ‰ excursion that may be associated with the “8.2 ka event” recorded in Greenland air temperatures. The δ18OGOM record, if interpreted as a salinity proxy, suggest large salinity fluctuations (> 2 ‰) reflecting changes in evaporation-precipitation (E-P) and Mississippi River input to the GOM. Percent Globigerinoides sacculifer records from three cores in the GOM exhibit remarkably coherent changes, suggesting episodic v centennial-scale incursions of Caribbean waters. Spectral analysis of the Mg/Ca-SST and the δ18OGOM time series indicate that surface water conditions may be influenced by solar variations because they share significant periods of variability with atmospheric ∆ 14C near 700, 200, and 80-70 years. Our results add to the growing body of evidence that the sub-tropics were characterized by significant decadal to centennial-scale climatic and hydrologic variability during the early Holocene. |
format |
Thesis |
author |
LoDico, Jenna Meredith |
author_facet |
LoDico, Jenna Meredith |
author_sort |
LoDico, Jenna Meredith |
title |
Sub-Centennial Scale Climatic and Hydrologic Variability in the Gulf of Mexico during the Early Holocene |
title_short |
Sub-Centennial Scale Climatic and Hydrologic Variability in the Gulf of Mexico during the Early Holocene |
title_full |
Sub-Centennial Scale Climatic and Hydrologic Variability in the Gulf of Mexico during the Early Holocene |
title_fullStr |
Sub-Centennial Scale Climatic and Hydrologic Variability in the Gulf of Mexico during the Early Holocene |
title_full_unstemmed |
Sub-Centennial Scale Climatic and Hydrologic Variability in the Gulf of Mexico during the Early Holocene |
title_sort |
sub-centennial scale climatic and hydrologic variability in the gulf of mexico during the early holocene |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2006 |
url |
https://digitalcommons.usf.edu/etd/3867 https://digitalcommons.usf.edu/context/etd/article/5063/viewcontent/Sub_centennial_scale_climatic_and_hydrologic_variability_in_the_Gulf_of_Mexico_during_the_early_Holocene.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Orca |
genre_facet |
Greenland Orca |
op_source |
USF Tampa Graduate Theses and Dissertations |
op_relation |
https://digitalcommons.usf.edu/etd/3867 https://digitalcommons.usf.edu/context/etd/article/5063/viewcontent/Sub_centennial_scale_climatic_and_hydrologic_variability_in_the_Gulf_of_Mexico_during_the_early_Holocene.pdf |
op_rights |
default |
_version_ |
1768388122026967040 |