TY - SER ID - mix1999ffeo T1 - Foraminiferal faunal estimates of paleotemperature: Circumventing the no-analog problem yields cool ice age tropics AU - Mix, Alan C AU - Morey, Ann E AU - Pisias, Nicklas G AU - Hostetler, Steven W PY - 1999 T2 - Supplement to: Mix, AC et al. (1999): Foraminiferal faunal estimates of paleotemperature: Circumventing the no-analog problem yields cool ice age tropics. Paleoceanography, 14(3), 350-359, https://doi.org/10.1029/1999PA900012 PB - PANGAEA DO - 10.1594/PANGAEA.692130 UR - https://doi.org/10.1594/PANGAEA.692130 N2 - 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. ER -