Foraminiferal faunal estimates of paleotemperature: Circumventing the no-analog problem yields cool ice age tropics Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/jq085r218

Copyright 1999 by the American Geophysical Union

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • The sensitivity of the tropics to climate change, particularly the amplitude of glacial-to-interglacial changes in sea surface temperature (SST), is one of the great controversies in paleoclimatology. Here we reassess faunal estimates of ice age SSTs, focusing on the problem of no-analog planktonic foraminiferal assemblages in the equatorial oceans that confounds both classical transfer function and modern analog methods. A new calibration strategy developed here, which uses past variability of species to define robust faunal assemblages, solves the no-analog problem and reveals ice age cooling of 5° to 6°C in the equatorial current systems of the Atlantic and eastern Pacific Oceans. Classical transfer functions underestimated temperature changes in some areas of the tropical oceans because core-top assemblages misrepresented the ice age faunal assemblages. Our finding is consistent with some geochemical estimates and model predictions of greater ice age cooling in the tropics than was inferred by Climate: Long-Range Investigation, Mapping, and Prediction (CLIMAP) [1981] and thus may help to resolve a long-standing controversy. Our new foraminiferal transfer function suggests that such cooling was limited to the equatorial current systems, however, and supports CLIMAP's inference of stability of the subtropical gyre centers.
Resource Type
Date Available
Date Issued
Citation
  • Mix, Alan C., Ann E. Morey, Nicklas G. Pisias, and Steven W. Hostetler. "Foraminiferal faunal estimates of paleotemperature: Circumventing the no-analog problem yields cool ice age tropics." Paleoceanography 14.3 (1999), pp. 350-359.
Rights Statement
Publisher
Replaces
Additional Information
  • description.provenance : Made available in DSpace on 2010-04-21T15:59:04Z (GMT). No. of bitstreams: 1 Mix et al Paleo 1999.pdf: 435874 bytes, checksum: f3a020108552b6f8764bcf36ab108b16 (MD5) Previous issue date: 1999-06
  • Vol. 14 No. 3 (1999)
  • Paleoceanography
  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2010-04-21T15:59:04Z (GMT) No. of bitstreams: 1 Mix et al Paleo 1999.pdf: 435874 bytes, checksum: f3a020108552b6f8764bcf36ab108b16 (MD5)
  • description.provenance : Submitted by Xiaoping Li (xiaoping.li@oregonstate.edu) on 2010-04-20T21:57:57Z No. of bitstreams: 1 Mix et al Paleo 1999.pdf: 435874 bytes, checksum: f3a020108552b6f8764bcf36ab108b16 (MD5)

Relationships

In Administrative Set:
Last modified: 12/07/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items