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Faunal re-evaluation of Mid-Pliocene conditions in the western equatorial Pacific

Micropaleontology

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DOI: 10.2113/gsmicropal.53.6.447

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Abstract

Mid-Pliocene low-latitude Pacific faunal (planktic foraminifer) sea surface temperature (SST) estimates are normally based upon the Modern Analog Technique (MAT). In the Eastern equatorial Pacific (EEP), where upwelling of cool water predominates, MAT can be used to discern both cooling and warming in Neogene records. SST today is ???30??C in the western equatorial Pacific (WEP) warm pool, the upper limit of the modern calibration data, and past warming above that level is difficult to assess using faunal methods. Mid-Pliocene fossil samples from the WEP have been analyzed using several variations of MAT with different outcomes and associated levels of confidence. While SST above ???30??C in the WEP during the mid-Pliocene cannot be ruled out due to the limitations of the method, temperatures this warm seem unlikely. In addition to the mid-Pliocene, planktic foraminifer assemblages from the coretop, last glacial maximum, last interglacial and the penultimate glacial (Marine Isotope Stage 6) show striking similarity to each other which suggests little to no change in the region between times of global climate extremes. There is generally good agreement between the Mg/Ca paleothermometer and MAT derived faunal SST estimates. Both suggest stability of the WEP warm pool.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Faunal re-evaluation of Mid-Pliocene conditions in the western equatorial Pacific
Series title:
Micropaleontology
DOI:
10.2113/gsmicropal.53.6.447
Volume
53
Issue:
6
Year Published:
2007
Language:
English
Publisher:
GeoScienceWorld
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Micropaleontology
First page:
447
Last page:
456
Number of Pages:
10