Tropical sea temperatures in the high-latitude South Pacific during the Eocene (original) (raw)
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Early Paleogene temperature history of the Southwest Pacific Ocean: Reconciling proxies and models
Earth and Planetary …, 2012
We present a new multiproxy (TEX 86 , d 18 O and Mg/Ca), marine temperature history for Canterbury Basin, eastern New Zealand, that extends from middle Paleocene to middle Eocene, including the Paleocene-Eocene thermal maximum (PETM) and early Eocene climatic optimum (EECO). In light of concerns that proxy-based sea surface temperature (SST) estimates are untenably warm for the southwest Pacific during the Eocene, we review the assumptions that underlie the proxies and develop a preliminary paleo-calibration for TEX 86 that is based on four multiproxy Eocene records that represent an SST range of 15-34 1C. For the southwest Pacific Paleogene, we show that TEX 86 L exhibits the best fit with the Eocene paleo-calibration. SSTs derived from related proxies (TEX 86 H , 1/TEX 86 ) exhibit a systematic warm bias that increases as TEX86 values decrease (a warm bias of 4-7 1C where TEX 86 o 0.7). The TEX 86 L proxy indicates that southwest Pacific SST increased by $ 10 1C from middle Paleocene to early Eocene, with SST maxima of 26-28 1C (tropical) during the PETM and EECO and an SST minimum of 13-16 1C (cool-warm temperate) at the middle/late Paleocene transition (58.7 Ma).
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