||Multiproxy temperature estimation requires careful attention to biological, chemical,
physical, temporal, and calibration differences of each proxy and paleothermometry
method. We evaluated mid-Pliocene sea surface temperature (SST) estimates from multiple
proxies at Deep Sea Drilling Project Holes 552A, 609B, 607, and 606, transecting the
North Atlantic Drift. SST estimates derived from faunal assemblages, foraminifer Mg/Ca,
and alkenone unsaturation indices showed strong agreement at Holes 552A, 607, and
606 once differences in calibration, depth, and seasonality were addressed. Abundant
extinct species and/or an unrecognized productivity signal in the faunal assemblage
at Hole 609B resulted in exaggerated faunal-based SST estimates but did not affect
alkenone-derived or Mg/Ca-derived estimates. Multiproxy mid-Pliocene North Atlantic
SST estimates corroborate previous studies documenting high-latitude mid-Pliocene
warmth and refine previous faunal-based estimates affected by environmental factors
other than temperature. Multiproxy investigations will aid SST estimation in high-latitude
areas sensitive to climate change and currently underrepresented in SST reconstructions.
Copyright 2008 by the American Geophysical Union.