Northern Indian Ocean SST Reconstruction and Oxygen Isotope, Ba/Ca and Geochemistry Data for last 31,000 Years Saraswat, R.; Lea, D.W.; Nigam, R.; Mackensen, A.; Naik, D.K. Saraswat, R. Lea, D.W. Nigam, R. Mackensen, A. Naik, D.K. Sea Surface Temperature Reconstruction Younger Dryas earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,Mg/Ca G. ruber using Dekens 2002) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (magnesium/calcium,Globigerinoides ruber white,null,millimole per mole,null,paleoceanography,null,inductively-coupled plasma mass spectrometry,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Globigerinoides ruber white,null,per mil VPDB,null,paleoceanography,null,inductively-coupled plasma mass spectrometry,N,null) earth science/paleoclimate/paleoceanography (barium/calcium,Globigerinoides ruber white,null,micromole per mole,null,paleoceanography,null,inductively-coupled plasma mass spectrometry,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil VPDB,null,climate reconstructions|paleoceanography,null,null,N,Calculated from delta 18Oforam - SST contribution using G. ruber white) 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 (SK237-GC04>LATITUDE 10.9775>LONGITUDE 74.999333) High resolution climate records of the ice age terminations from monsoon-dominated regions reveal the interplay of regional and global driving forces. Speleothem records from Chinese caves indicate that glacial terminations were interrupted by prominent weak monsoon intervals (WMI), lasting a few thousand years. Deglacial WMIs are interpreted as the result of cold temperature anomalies generated by sea ice feedbacks in the North Atlantic, most prominently during Heinrich Events. Recent modelling results suggest, however, that WMIs reflect changes in the intensity of the Indian rather than the East Asian monsoon. Here we use foraminiferal trace element (Mg/Ca and Ba/Ca) and stable isotope records from a sediment core off the Malabar coast in the southeastern Arabian Sea with centennial-scale resolution to test this hypothesis and to constrain the nature and timing of deglacial climate change in the tropical Indian Ocean. The Malabar deglacial SST record is unique in character and different from other tropical climate records. SST at the Last Glacial Maximum was 2.7±0.5 °C colder than pre-industrial SST. Deglacial warming started at 18.6 (95% CI range 18.8-18.1) kyr BP, within error of the onset of warming at other tropical sites as well as in Antarctica and the Southern Ocean and either coeval with or up to 1 kyr before the atmospheric CO2 rise. Warming took place in two steps separated by an interval of stable SST between 15.7 (16.2-14.9) and 13.2 (13.9-12.0) kyr BP. The d18O-water record and the Ba/Ca record, which is a measure of Indian sub-continent riverine runoff, indicate that the last ice age termination was marked by a prominent weak Indian Monsoon interval interrupted by an intense monsoon phase, as seen in speleothem records and predicted by modelling. A strong correspondence between the timing of the Malabar d18Osw record and the Hulu Cave monsoon record suggests that deglacial d18O changes in both localities dominantly reflect compositional changes in precipitation, likely driven by changes in the North Atlantic. STUDY NOTES: Centennial scale seawater temperature and runoff record covering the last deglacialtion in the northern Indian Ocean Provided Keywords: Holocene, Younger Dryas, glacial NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Saraswat, R. Investigator : Lea, D.W. Investigator : Nigam, R. Investigator : Mackensen, A. Investigator : Naik, D.K. 2014-12-14 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/17575 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/saraswat2013/saraswat2013-sk237gc04.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/saraswat2013/saraswat2013-sk237gc04.txt English https://www.ncdc.noaa.gov/paleo/study/17575 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/saraswat2013/saraswat2013-sk237gc04.txt Saraswat, R., D.W. Lea, R. Nigam, A. Mackensen, and D.K. Naik2013Deglaciation in the tropical Indian Ocean driven by interplay between the regional monsoon and global teleconnectionsEarth and Planetary Science Letters375166-17510.1016/j.epsl.2013.05.022 START YEAR: 31600 cal yr BP * END YEAR: 120 cal yr BP 74.999333 10.9775 74.999333 10.9775