California Current Reconstruction from Benthic Isotopes and Alkenone Temperatures Herbert, T.D.; Schuffert, J.D.; Andreasen, D.H.; Heusser, L.E.; Lyle, M. Herbert, T.D. Schuffert, J.D. Andreasen, D.H. Heusser, L.E. Lyle, M. Sea Surface Temperature Reconstruction earth science/paleoclimate/paleoceanography (delta 18O,benthic foraminifer,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age,null,null,calendar year before present,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,null) earth science/paleoclimate/paleoceanography (alkenone unsaturation index Uk37 prime,null,null,dimensionless,null,paleoceanography,null,null,N,null) 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 earth science/paleoclimate/paleocean (LPAZ 21P>LATITUDE 22.98>LONGITUDE -109.4667) (ODP1020>LATITUDE 41>LONGITUDE -126.43) (ODP1012>LATITUDE 32.28>LONGITUDE -118.38) Time series of alkenone unsaturation indices gathered along the California margin reveal large (4° to 8°C) glacial-interglacial changes in sea surface temperature (SST) over the past 550,000 years. Interglacial times with SSTs equal to or exceeding that of the Holocene contain peak abundances in the pollen of redwood, the distinctive component of the temperate rainforest of the northwest coast of California. In the region now dominated by the California Current, SSTs warmed 10,000 to 15,000 years in advance of deglaciation at each of the past five glacial maxima. SSTs did not rise in advance of deglaciation south of the modern California Current front. Glacial warming along the California margin therefore is a regional signal of the weakening of the California Current during times when large ice sheets reorganized wind systems over the North Pacific. Both the timing and magnitude of the SST estimates suggest that the Devils Hole (Nevada) calcite record represents regional but not global paleotemperatures, and hence does not pose a fundamental challenge to the orbital ("Milankovitch") theory of the Ice Ages. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Herbert, T.D. Investigator : Schuffert, J.D. Investigator : Andreasen, D.H. Investigator : Heusser, L.E. Investigator : Lyle, M. 2001-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/9038 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1012-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1020-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/herbert2001 https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/odp1020-sytr-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/lpaz21p-sytr-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/odp1012-sytr-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/lpaz21p-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1012-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1020-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/herbert2001 https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/odp1020-sytr-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/lpaz21p-sytr-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/odp1012-sytr-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/lpaz21p-tab.txt English https://www.ncdc.noaa.gov/paleo/study/9038 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1012-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1020-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/herbert2001 https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/odp1020-sytr-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/lpaz21p-sytr-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/odp1012-sytr-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/lpaz21p-tab.txt Herbert, T.D., J.D. Schuffert, D. Andreasen, L. Heusser, M. Lyle, A. Mix, A.C. Ravelo, L.D. Stott, and J.C. Herguera. 2001. Collapse of the California current during glacial maxima linked to climate change on land. Science, 293,71-76. START YEAR: 813198 cal yr BP * END YEAR: 1395 cal yr BP -126.43 22.98 -109.4667 41