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Middle Eocene regional climate instability; evidence from the western North Atlantic

Bridget S. Wade and Dick Kroon
Middle Eocene regional climate instability; evidence from the western North Atlantic
Geology (Boulder) (November 2002) 30 (11): 1011-1014

Abstract

High-resolution ( approximately 3 k.y.) delta (super 18) O records from middle Eocene mixed-layer dwelling planktonic foraminifera from the western North Atlantic show pronounced (>1 ppm) variability. The magnitude of change is greater than that seen in open-ocean Pleistocene records, but could not have been caused by ice-volume and/or sea-level fluctuations. Instead, the oxygen isotope shifts resulted primarily from large oscillations in sea-surface temperatures and indicate that the regional paleoceanography of the middle Eocene western North Atlantic was not consistently warm or stable. The large shifts in sea-surface temperatures could reflect variations in the position of the Gulf Stream relative to Blake Nose or variations in upwelling intensity.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 30
Serial Issue: 11
Title: Middle Eocene regional climate instability; evidence from the western North Atlantic
Affiliation: University of Edinburgh, Department of Geology and Geophysics, Edinburgh, United Kingdom
Pages: 1011-1014
Published: 200211
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 31
Accession Number: 2002-079181
Categories: StratigraphyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2002119
Illustration Description: illus.
N29°57'05" - N29°57'05", W76°37'36" - W76°37'36"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200224
Program Name: ODPOcean Drilling Program
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