Western Caribbean sea surface temperatures during the late Quaternary

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doi: 10.1029/2005GC000957
Author(s): Schmidt, Matthew W.; Vautravers, Maryline J.; Spero, Howard J.
Author Affiliation(s): Primary:
University of California Davis, Department of Geology, Davis, CA, United States
University of Cambridge, United Kingdom
Volume Title: Geochemistry, Geophysics, Geosystems - G<sup>3</sup>
Source: Geochemistry, Geophysics, Geosystems - G>3`, 7(2), 17p. Publisher: American Geophysical Union and The Geochemical Society, United States. ISSN: 1525-2027
Note: In English. 109 refs.; illus., incl. 3 tables, sketch map
Summary: Mg/Ca ratios in the planktonic foraminifera Globigerinoides ruber from Colombian Basin core ODP 999A suggest that Caribbean sea surface temperatures (SSTs) were from 2.1 to 2.7°C colder than the present during the last three glacial maximums. In comparison, faunal derived SSTs (SIMMAX method) show that August SSTs in the Caribbean varied <2°C over the past 360 kyr, whereas February SSTs varied between 21.0°C and 26.5°C. Changes in the Mg/Ca-SST record contain a strong 23 kyr periodicity, suggesting the Mg/Ca-SST record reflects a warm season weighted SST average rather than an annual mean SST. Combining several dissolution indices, we identify brief periods of decreased carbonate preservation in our record and show that MIS 11 stands out as the most intensive dissolution cycle in the Caribbean over the last 460 kyr. Comparison of Caribbean SST change with a similar estimate of tropical SST variability in the western Pacific over the past 360 kyr reveals shifts in the east-west tropical SST gradient that are coeval with glacial-interglacial climate change and consistent both with a southward migration of the glacial ITCZ and with a glacial El Nino-like mode of tropical circulation.
Year of Publication: 2006
Research Program: ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; Alkaline earth metals; Atlantic Ocean; Calcium; Carbonates; Caribbean Sea; Cenozoic; Chemical ratios; Colombian Basin; El Nino; Foraminifera; Glacial environment; Globigerinacea; Globigerinidae; Globigerinoides; Interglacial environment; Invertebrates; Leg 165; Magnesium; Metals; Microfossils; North Atlantic; ODP Site 999; Ocean Drilling Program; Ocean circulation; Paleo-oceanography; Paleoclimatology; Paleoenvironment; Planktonic taxa; Protists; Quaternary; Rotaliina; Sea-surface temperature; Shells; Upper Quaternary
Coordinates: N124437 N124437 W0784422 W0784422
Record ID: 2008009041
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