Southeastern Indian Ocean Mg/Ca, Ba/Ca, d18O and SST data over the last 17,000 yr. BP Weldeab, S.; Lea, D.W.; Oberhänsli, H.; Schneider, R.R. Weldeab, S. Lea, D.W. Oberhänsli, H. Schneider, R.R. Sea Surface Temperature Reconstruction earth science/paleoclimate/climate reconstructions|paleoceanography (notes,null,null,null,null,climate reconstructions|paleoceanography,null,null,C,null) earth science/paleoclimate/paleoceanography (delta 18O,Globigerinoides ruber,null,per mil PDB,null,paleoceanography,composited,null,N,null) earth science/paleoclimate/paleoceanography (barium/calcium,Globigerinoides ruber,null,micromole per mole,null,paleoceanography,corrected,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (depth,null,null,centimeter,null,climate reconstructions|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,calculated using Mg/Ca (mmol/mol) = 0.38*exp[0.09*T(°C)] (Dekens et al. 2002; Anand et al. 2002)) earth science/paleoclimate/paleoceanography (magnesium/calcium,Globigerinoides ruber,null,millimole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (magnesium/calcium,Globigerinoides ruber,null,millimole per mole,null,paleoceanography,composited,null,N,null) earth science/paleoclimate/paleoceanography (barium/calcium,Globigerinoides ruber,null,micromole per mole,null,paleoceanography,composited,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil SMOW,null,climate reconstructions|paleoceanography,composited,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (age,null,null,calendar year before present,null,climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil SMOW,null,climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,composited,null,N,calculated using Mg/Ca (mmol/mol) = 0.38*exp[0.09*T(°C)] (Dekens et al. 2002; Anand et al. 2002)) earth science/paleoclimate/paleoceanography (delta 18O,Globigerinoides ruber,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (GeoB9307-3/GeoB9310-4>LATITUDE >LONGITUDE ) (GeoB9307-3>LATITUDE -18.5525>LONGITUDE 37.3688) (GeoB9310-4>LATITUDE -19.203>LONGITUDE 37.04694) Time series of Mg/Ca, Ba/Ca, and δ18O analyzed in tests of surface-dwelling planktonic foraminifer Globigerinoides ruber from two marine sediment cores recovered in the Mozambique Channel offthe Zambezi River, southwestern tropical Indian Ocean, reveal climate variability over the last 17 kyr. Analysis of samples collected from the water column of the Mozambique Channel validates that Mg/Ca in G. ruber reflects calcification temperatures at 0-30 m water depth and that the surface water of the southwestern Indian Ocean is very sensitive to dissolved Ba input from adjacent rivers. Foraminiferal Ba/Ca and Mg/Ca time series are used to reconstruct hydrological and thermal changes over southeastern African and southwestern tropical oceans. The Mg/Ca-based sea surface temperature (SST) estimates indicate that the thermal evolution of the tropical southwestern Indian Ocean followed, within age model uncertainties, climate changes over Antarctica. The trend of the SST record is marked by a gradual warming from 24.7 ± 0.6 °C at 17.0 ± 0.2 kyr BP to 26.4 ± 0.3 °C at 10-11 kyr BP interrupted by two prominent coolings of ~1.5 ± 0.2 °C and ~1 °C centered at 15 ± 0.1 kyr BP and 13.4 ± 0.2 kyr BP, respectively. Declining SSTs in the early Holocene reach their minimum (25 °C) at 8.7 ± 0.2 kyr BP and give way to stable thermal conditions over the Middle and Late Holocene. The Ba/Ca record indicates that the Zambezi basin experienced relatively wetconditions during the early phase of the last deglaciation, Bølling-Allerød, and the early Holocene. These wet phases coincide with an increase of SST in the Mozambique Channel. In contrast, relatively dry conditions through-out the middle and late Holocene epoch are accompanied by relatively cold Mozambique Channel surface water. These shifts likely reflect a response to meridional shifts of the austral westerlies and subtropical front. These hypothesized shifts would have modulated the advection of cold Southern Ocean water into the Mozambique Channel. Changes in SST in the Mozambique Channel, and possible resultant changes in the zonal gradient in the tropical Indian Ocean, in turn, had a strong impact on the precipitation over southeastern Africa. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Weldeab, S. Investigator : Lea, D.W. Investigator : Oberhänsli, H. Investigator : Schneider, R.R. 2017-06-26 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/22272 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2014/weldeab2014-gb9307-3.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2014/weldeab2014-comp.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2014/weldeab2014-gb9310-4.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2014/weldeab2014-gb9307-3.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2014/weldeab2014-comp.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2014/weldeab2014-gb9310-4.txt English https://www.ncdc.noaa.gov/paleo/study/22272 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2014/weldeab2014-gb9307-3.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2014/weldeab2014-comp.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weldeab2014/weldeab2014-gb9310-4.txt Weldeab, S., D.W. Lea, H. Oberhänsli, and R.R. Schneider2014Links between southwestern tropical Indian Ocean SST and precipitation over southeastern Africa over the last 17 kyrPalaeogeography, Palaeoclimatology, Palaeoecology410200-21210.1016/j.palaeo.2014.06.001 START YEAR: 17300 cal yr BP * END YEAR: 100 cal yr BP 37.04694 -19.203 37.3688 -18.5525