Western Pacific Warm Pool ODP871 500 KYr Foraminiferal d18O and Mg/Ca SST Dyez, K.A.; Ravelo, A.C. Dyez, K.A. Ravelo, A.C. Sea Surface Temperature Reconstruction Warm Pool earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (magnesium/calcium,Globigerinoides ruber,null,dimensionless,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Globigerinoides ruber,null,per mil VPDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,Mg/Ca Globigerinoides ruber) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,Site Hole Core Type Section Interval-cm) earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,null,null,N,mbsf) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (ODP 871>LATITUDE 5.5572>LONGITUDE 172.3443) Understanding how global temperature changes with increasing atmospheric greenhouse gas concentrations, or climate sensitivity, is of central importance to climate change research. Climate models provide sensitivity estimates that may not fully incorporate slow, long-term feedbacks such as those involving ice sheets and vegetation. Geological studies, on the other hand, can provide estimates that integrate long- and short-term climate feedbacks to radiative forcing. Because high latitudes are thought to be most sensitive to greenhouse gas forcing owing to, for example, ice-albedo feedbacks, we focus on the tropical Pacific Ocean to derive a minimum value for long-term climate sensitivity. Using Mg/Ca paleothermometry from the planktonic foraminifera Globigerinoides ruber from the past 500 k.y. at Ocean Drilling Program (ODP) Site 871 in the western Pacific warm pool, we estimate the tropical Pacific climate sensitivity parameter (lambda) to be 0.94-1.06°C (W m-2)-1, higher than that predicted by model simulations of the Last Glacial Maximum or by models of doubled greenhouse gas concentration forcing. This result suggests that models may not yet adequately represent the long-term feedbacks related to ocean circulation, vegetation and associated dust, or the cryosphere, and/or may underestimate the effects of tropical clouds or other short-term feedback processes. STUDY NOTES: Mg/Ca paleothermometry from the planktonic foraminifera Globigerinoides ruber from the past 500 k.y. at Ocean Drilling Program (ODP) Site 871 in the western Pacific warm pool. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Dyez, K.A. Investigator : Ravelo, A.C. 2012-10-29 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/13479 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2013/dyez2013.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2013/dyez2013.txt English https://www.ncdc.noaa.gov/paleo/study/13479 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2013/dyez2013.txt Dyez, K.A. and A.C. Ravelo. 2013. Late Pleistocene tropical Pacific temperature sensitivity to radiative greenhouse gas forcing. Geology, January 2013. DOI: 110.1130/G33425.1 Published online 19-October-2012 START YEAR: 537150 cal yr BP * END YEAR: 0 cal yr BP 172.3443 5.5572 172.3443 5.5572