Indo-Pacific Warm Pool 40KYr SST and d18Osw Reconstructions Mohtadi, M.; Steinke, S.; Lückge, A.; Groeneveld, J.; Hathorne, E.C. Mohtadi, M. Steinke, S. Lückge, A. Groeneveld, J. Hathorne, E.C. Other Hydroclimate Reconstruction Sea Surface Temperature Reconstruction Warm Pool earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,G. ruber sensu lato) earth science/paleoclimate/climate reconstructions|paleoceanography (delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil VSMOW,null,climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (magnesium/calcium,Globigerinoides ruber sensu stricto,null,millimole per mole,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,G. ruber sensu stricto) earth science/paleoclimate/paleoceanography (magnesium/calcium,Globigerinoides ruber sensu lato,null,millimole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) 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 (GeoB10038-4>LATITUDE -5.9375>LONGITUDE 103.246) (GeoB10029-4>LATITUDE -1.4945>LONGITUDE 100.128) Quantifying the spatial and temporal sea surface temperature (SST) and salinity changes of the Indo-Pacific Warm Pool is essential to understand the role of this region in connection with abrupt climate changes particularly during the last deglaciation. In this study we reconstruct SST and seawater d18O of the tropical eastern Indian Ocean for the past 40,000 years from two sediment cores (GeoB 10029-4, 1°30'S, 100°08'E, and GeoB 10038-4, 5°56'S, 103°15'E) retrieved offshore Sumatra. Our results show that annual mean SSTs increased about 2-3 °C at 19,000 years ago and exhibited southern hemisphere- like timing and pattern during the last deglaciation. Our SST records together with other Mg/Ca-based SST reconstructions around Indonesia do not track the monsoon variation since the last glacial period, as recorded by terrestrial monsoon archives. However, the spatial SST heterogeneity might be a result of changing monsoon intensity that shifts either the annual mean SSTs or the seasonality of G. ruber towards the warmer or the cooler season at different locations. Seawater d18O reconstructions north of the equator suggest fresher surface conditions during the last glacial and track the northern high-latitude climate change during the last deglaciation. In contrast, seawater d18O records south of the equator do not show a significant difference between the last glacial period and the Holocene, and lack Bølling-Allerød and Younger Dryas periods suggestive of additional controls on annual mean surface hydrology in this part of the Indo-Pacific Warm Pool. STUDY NOTES: Benthic (Cibicidoides wuellerstorfi) and planktonic (Globigerinoides ruber, sensu stricto or sensu lato) foraminiferal oxygen isotope (d18O) and Mg/Ca data, plus reconstructed Sea Surface Temperature (SST) and d18O-seawater from two Indo-Pacific Warm Pool cores for the last 40,000 years. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Mohtadi, M. Investigator : Steinke, S. Investigator : Lückge, A. Investigator : Groeneveld, J. Investigator : Hathorne, E.C. 2011-05-14 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/11192 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mohtadi2010/mohtadi2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mohtadi2010/mohtadi2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mohtadi2010/mohtadi2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mohtadi2010/mohtadi2010.txt English https://www.ncdc.noaa.gov/paleo/study/11192 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mohtadi2010/mohtadi2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mohtadi2010/mohtadi2010.txt Mohtadi, M., S. Steinke, A. Lückge, J. Groeneveld, and E.C. Hathorne. 2010. Glacial to Holocene surface hydrography of the tropical eastern Indian Ocean. Earth and Planetary Science Letters, Vol. 292, pp. 89-97. doi:10.1016/j.epsl.2010.01.024 START YEAR: 40120 cal yr BP * END YEAR: 0 cal yr BP 100.128 -5.9375 103.246 -1.4945