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1400 yr multiproxy record of climate variability from the northern Gulf of Mexico

J. N. Richey, R. Z. Poore, B. P. Flower and T. M. Quinn
1400 yr multiproxy record of climate variability from the northern Gulf of Mexico
Geology (Boulder) (May 2007) 35 (5): 423-426


A continuous decadal-scale resolution record of climate variability over the past 1400 yr in the northern Gulf of Mexico was constructed from a box core recovered in the Pigmy Basin, northern Gulf of Mexico. Proxies include paired analyses of Mg/Ca and delta (super 18) O 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 indicate that Gulf of Mexico sea surface temperatures (SSTs) were as warm or warmer than near-modern conditions between 1000 and 1400 yr B.P. Foraminiferal Mg/Ca during the coolest interval of the Little Ice Age (ca. 250 yr B.P.) indicate that SST was 2-2.5 degrees C below modern SST. Four minima in the Mg/Ca record between 900 and 250 yr B.P. correspond with the Maunder, Sporer, Wolf, and Oort sunspot minima, suggesting a link between changes in solar insolation and SST variability in the Gulf of Mexico. An abrupt shift recorded in both delta (super 18) O (sub calcite) and relative abundance of G. sacculifer occurred ca. 600 yr B.P. The shift in the Pigmy Basin record corresponds with a shift in the sea-salt-sodium (ssNa) record from the Greenland Ice Sheet Project 2 ice core, linking changes in high-latitude atmospheric circulation with the subtropical Atlantic Ocean.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 35
Serial Issue: 5
Title: 1400 yr multiproxy record of climate variability from the northern Gulf of Mexico
Affiliation: University of South Florida, College of Marine Science, Saint Petersburg, FL, United States
Pages: 423-426
Published: 200705
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 23
Accession Number: 2007-045055
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2007101
Illustration Description: illus.
N27°00'00" - N28°00'00", W94°30'00" - W91°00'00"
Secondary Affiliation: U. S. Geological Survey, USA, United StatesUniversity of Texas at Austin, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200724
Program Name: USGSOPNon-USGS publications with USGS authors
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