Guaymas and Cariaco Basin 300 Year Alkenone SST Reconstructions Goni, M.; Thunell, R.C.; Woodwort, M.P.; Müller-Karger, F.E. Goni, M. Thunell, R.C. Woodwort, M.P. Müller-Karger, F.E. Intertropical Convergence Zone (ITCZ) Sea Surface Temperature Reconstruction earth science/paleoclimate/paleoceanography (depth,null,null,millimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (alkenone unsaturation index Uk37,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,null) earth science/paleoclimate/paleoceanography (age,null,null,year Common Era,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (MC-4>LATITUDE 10.6496>LONGITUDE -64.6607) (BC-43>LATITUDE 28>LONGITUDE -111.8) Analysis of sediments from two wind-driven upwelling systems, Guaymas and Cariaco basins, using the alkenone-based Uk'37 paleothermometer yielded high-resolution records of sea surface temperatures (SST) from 1700 to 2000 AD. The trends in the UK'37 index reveal steady SST increases of 1 to 2°C at both sites since the end of the Little Ice Age. Higher-frequency changes in SST indicate a decoupling in the relative intensity of wind-driven upwelling at the two sites. Periods of enhanced upwelling in Guaymas correspond to periods of decreased upwelling in Cariaco (and vice versa). We propose that these contrasts reflect regional differences in the upwelling response of upwelling to changes in the positioning of the Inter-Tropical Convergence Zone (ITCZ) and the Subtropical High (SH) under current climate conditions. STUDY NOTES: We analyzed sediments from box cores collected in Guaymas Basin and Cariaco Basin to produce high-resolution records of alkenone Uk'37 index and alkenone-derived SST values from 1700 to 2000 AD. Both cores are varved throughout their entire length and their age models, which are based on 210Pb and 14C AMS chronologies, are consistent with average accumulation rates of ~1.1 mm/y at both sites. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Goni, M. Investigator : Thunell, R.C. Investigator : Woodwort, M.P. Investigator : Müller-Karger, F.E. 2012-11-19 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/13541 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/goni2006/goni2006bc43.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/goni2006/goni2006mc4.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/goni2006/goni2006bc43.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/goni2006/goni2006mc4.txt English https://www.ncdc.noaa.gov/paleo/study/13541 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/goni2006/goni2006bc43.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/goni2006/goni2006mc4.txt Miguel A. Goni, Robert C. Thunell, Mark P. Woodwort, and Frank E. Mueller-Karger. 2006. Changes in wind-driven upwelling during the last three centuries: Interocean teleconnections. Geophysical Research Letters, Vol. 33, L15604 DOI: 10.1029/2006GL026415 START YEAR: 1694 AD * END YEAR: 1996 AD -111.8 10.6496 -64.6607 28