Cariaco Basin and Arabian Sea Sediment Reflectance Data Over the Last 100,000 Years Deplazes, G.; Lückge, A.; Peterson, L.C.; Timmermann, A.; Hamann, Y.; Hughen, K.A.; Röhl, U.; Laj, C.; Cane, M.A.; Sigman, D.M.; Haug, G.H. Deplazes, G. Lückge, A. Peterson, L.C. Timmermann, A. Hamann, Y. Hughen, K.A. Röhl, U. Laj, C. Cane, M.A. Sigman, D.M. Haug, G.H. Dansgaard-Oeschger cycles Intertropical Convergence Zone (ITCZ) earth science/paleoclimate/paleoceanography (depth,null,null,meter,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/paleoceanography (depth,null,null,meter,null,paleoceanography,corrected,null,N,null) earth science/paleoclimate/paleoceanography (reflectance,sediment,null,dimensionless,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean (SO130-289KL>LATITUDE 23.12233>LONGITUDE 66.49722) (MD03-2621>LATITUDE 10.67817>LONGITUDE -64.9715) During the last glacial period, the North Atlantic region experienced pronounced, millennial-scale alternations between cold, stadial conditions and milder interstadial conditions—commonly referred to as Dansgaard-Oeschger oscillations - as well as periods of massive iceberg discharge known as Heinrich events. Changes in Northern Hemisphere temperature, as recorded in Greenland, are thought to have affected the location of the Atlantic inter tropical convergence zone and the strength of the Indian summer monsoon. Here we use high-resolution records of sediment color - a measure of terrigenous versus biogenic content - from the Cariaco Basin off the coast of Venezuela and the Arabian Sea to assess teleconnections with the North Atlantic climate system during the last glacial period. The Cariaco record indicates that the intertropical convergence zone migrated seasonally over the site during mild stadial conditions, but was permanently displaced south of the basin during peak stadials and Heinrich events. In the Arabian Sea, we find evidence of a weak Indian summer monsoon during the stadial events. The tropical records show a more variable response to North Atlantic cooling than the Greenland temperature records. We therefore suggest that Greenland climate is especially sensitive to variations in the North Atlantic system - in particular sea-ice extent - whereas the intertropical convergence zone and Indian monsoon system respond primarily to variations in mean Northern Hemisphere temperature. STUDY NOTES: Sediment total reflectance, L*, was measured in transects from digital images of the sediment surface with a down-core resolution of ~70 μm (143- 146 pixels/cm). The age model is based on cross-correlation to 14C-dated cores from the same region and by correlating the L* records to the ice-core d18O record of NGRIP using the extended GICC05 age scale. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Deplazes, G. Investigator : Lückge, A. Investigator : Peterson, L.C. Investigator : Timmermann, A. Investigator : Hamann, Y. Investigator : Hughen, K.A. Investigator : Röhl, U. Investigator : Laj, C. Investigator : Cane, M.A. Investigator : Sigman, D.M. Investigator : Haug, G.H. 2013-06-19 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/14588 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/deplazes2013/deplazes2013-cariaco.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/deplazes2013/deplazes2013-arabian.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/deplazes2013/SO130-289KL_SedimentImages_Reflectance.pdf https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/deplazes2013/MD03-2621_SedimentImages_Reflectance.pdf https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/deplazes2013/deplazes2013-cariaco.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/deplazes2013/deplazes2013-arabian.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/deplazes2013/SO130-289KL_SedimentImages_Reflectance.pdf https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/deplazes2013/MD03-2621_SedimentImages_Reflectance.pdf English https://www.ncdc.noaa.gov/paleo/study/14588 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/deplazes2013/deplazes2013-cariaco.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/deplazes2013/deplazes2013-arabian.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/deplazes2013/SO130-289KL_SedimentImages_Reflectance.pdf https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/deplazes2013/MD03-2621_SedimentImages_Reflectance.pdf Deplazes, G., Lückge, A., Peterson, L.C., Timmermann, A., Hamann, Y., Hughen, K.A., Röhl, U., Laj, C., Cane, M.A., Sigman, D.M. and Haug, G.H. 2013. Links between tropical rainfall and North Atlantic climate during the last glacial period. Nature Geoscience, 6, 213-217. DOI: 10.1038/ngeo1712. START YEAR: 109200 cal yr BP * END YEAR: 1740 cal yr BP -64.9715 10.67817 66.49722 23.12233