Southern Ocean Midlatitude 160KYr Alkenone SST Reconstructions Pahnke, K.; Sachs, J.P. Pahnke, K. Sachs, J.P. Sea Surface Temperature Reconstruction earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,alkenone unsaturation index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,Prahl et al. 1988 calibration) earth science/paleoclimate/paleoceanography (age,null,null,calendar year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (alkenone unsaturation index Uk37 prime,null,null,dimensionless,null,paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,alkenone unsaturation index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,Sikes and Volkman 1993 calibration) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (MD97-2121>LATITUDE -40.37>LONGITUDE 177.98) (MD97-2120>LATITUDE -45.53>LONGITUDE 174.93) Late Quaternary climate fluctuated between extremes of glaciations, lasting ~90 kyr on average, and interglacial episodes, lasting ~10 kyr. Still largely unknown are the spatial and temporal evolution of these global climate states, with vigorous debate still underway on the mechanisms responsible for glacial inceptions and terminations. Though it is widely believed that the Southern Hemisphere oceans play a central role in global climate changes, few paleoclimate records exist from there. Here we present three new alkenone-derived SST records from the midlatitude Southern Hemisphere spanning the last 160 kyr, a full glacial-interglacial cycle. Our subtropical SST records from the last glacial period are characterized by (1) warming 47ŋ23 kyr B.P., when high latitudes in both hemispheres cooled, and (2) milder temperatures during the penultimate glacial period than during the last glacial interval. These SST features are found to be of tropical- to subtropical-wide extent, implying increased thermal gradients at times of high-latitude ice sheet growth. This has implications for the vigor of atmospheric and upper ocean circulation and the transport of heat and moisture to the poles that may have been instrumental in the growth and maintenance of polar ice sheets during glacial periods. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Pahnke, K. Investigator : Sachs, J.P. 2006-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/5589 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/m97-2121-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/m97-2120-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pahnke2006 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/m97-2121-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/m97-2120-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pahnke2006 English https://www.ncdc.noaa.gov/paleo/study/5589 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/m97-2121-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/m97-2120-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pahnke2006 Pahnke, K., and J.P. Sachs. 2006. Sea surface temperatures of southern midlatitudes 0-160 kyr B.P. Paleoceanography, 21, PA2003. START YEAR: 156360 cal yr BP * END YEAR: 1951 cal yr BP 174.93 -45.53 177.98 -40.37