Reevaluation of mid-Pliocene North Atlantic sea surface temperatures
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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.
Published Version (Please cite this version)10.1029/2008PA001608
Publication InfoDowsett, HJ; Dwyer, Gary; Lawrence, KT; & Robinson, MM (2008). Reevaluation of mid-Pliocene North Atlantic sea surface temperatures. Paleoceanography, 23(3). 10.1029/2008PA001608. Retrieved from https://hdl.handle.net/10161/6587.
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Instructor in Earth and Ocean Sciences
Dwyer's experience lies in the development of tracers and indicators of environmental change, and their application to modern and ancient environmental systems. Research areas include paleoceanography, paleoclimatology, carbonate sedimentology, marine geology and environmental geochemistry.