Western Tropical Atlantic 21KYr Mg/Ca SST, d18Osw, and SSS Weldeab, S.; Schneider, R.R.; Kölling, M. Weldeab, S. Schneider, R.R. Kölling, M. Meridional Overturning Circulation (MOC) Other Hydroclimate Reconstruction Sea Surface Temperature Reconstruction earth science/paleoclimate/climate reconstructions|paleoceanography (salinity,delta 18O|magnesium/calcium|sea surface,null,parts per thousand,null,climate reconstructions|paleoceanography,null,null,N,on G. ruber white) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,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,on G. ruber white) earth science/paleoclimate/climate reconstructions|paleoceanography (delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil VSMOW,null,climate reconstructions|paleoceanography,corrected,null,N,on G. ruber white; ice-volume corrected) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Globigerinoides ruber white,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (GeoB3129/3911>LATITUDE -4.6133>LONGITUDE -36.6367) A sediment core from the western tropical Atlantic covering the last 21,000 yr has been analysed for centennial scale reconstruction of sea surface temperature (SST) and ice volume-corrected oxygen isotopic composition of sea water (d18Oivc-sw) using Mg/Ca and d18O of the shallow dwelling planktonic foraminifer Globigerinoides ruber (white). At a period between 15.5 and 17.5 kyr BP, the Mg/Ca SST and d18Oivc-sw, a proxy for sea surface salinity (SSS), reveals a warming of around 2.5 °C along with an increase in salinity. A second period of pronounced warming and SSS increase occurred between 11.6 and 13.5 kyr BP. Within age model uncertainties, both warming intervals were synchronous with air temperature increase over Antarctica and ice retreat in the southern South Atlantic and terminated with abrupt centennial scale SSS decrease and slight SST cooling in conjunction with interglacial reactivation of the meridional overturning circulation (MOC). We suggest that during these warm intervals, production of saline and warm water of the North Brazil Current resulted in pronounced heat and salt accumulation, and was associated with warming in the southern Atlantic, southward displacement of the intertropical convergence zone and weakened MOC. At the termination of the Younger Dryas and Heinrich event 1, intensification of cross-equatorial heat and salt transport caused centennial scale cooling and freshening of the western tropical Atlantic surface water. This study shows that the western tropical Atlantic served as a heat and salt reservoir during deglaciation. The sudden release of accumulated heat and salt at the end of Younger Drays and Heinrich event 1 may have contributed to the rapid reinvigoration of the Atlantic MOC. STUDY NOTES: Planktonic foraminiferal (Globigerinoides ruber white) Mg/Ca Sea Surface Temperature (SST) (Arz et al. 1998, 1999), stable oxygen isotope (d18O) measurements, plus calculated d18O of sea water (d18Osw) and Sea Surface Salinity (SSS) from a western tropical Atlantic sediment core (NE-Brazilian continental margin) for the past 21,000 years. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Weldeab, S. Investigator : Schneider, R.R. Investigator : Kölling, M. 2011-05-13 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/11191 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2006/weldeab2006.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2006/weldeab2006.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2006/weldeab2006.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2006/weldeab2006.txt English https://www.ncdc.noaa.gov/paleo/study/11191 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2006/weldeab2006.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2006/weldeab2006.txt Weldeab, S., R.R. Schneider, and M. Kölling. 2006. Deglacial sea surface temperature and salinity increase in the western tropical Atlantic in synchrony with high latitude climate instabilities. Earth and Planetary Science Letters, Vol 241, pp. 699-706. doi:10.1016/j.epsl.2005.11.012 START YEAR: 20740 cal yr BP * END YEAR: 170 cal yr BP -36.6367 -4.6133 -36.6367 -4.6133