Antarctic Intermediate Water properties since 400 ka recorded in benthic foraminifera Elmore, A.C.; McClymont, E.L.; Elderfield, H.; Kender, S.; Cook, M.R.; Leng, M.J.; Greaves, M.; Misra, S. Elmore, A.C. McClymont, E.L. Elderfield, H. Kender, S. Cook, M.R. Leng, M.J. Greaves, M. Misra, S. earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,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 (boron/calcium,Uvigerina peregrina,null,micromole per mole,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 (delta 13C,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (sample identification,null,null,null,null,paleoceanography,null,null,C,null) earth science/paleoclimate/paleoceanography (magnesium/calcium,Uvigerina peregrina,null,millimole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (iron/calcium,Uvigerina peregrina,null,millimole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (manganese/calcium,Uvigerina peregrina,null,millimole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (DSDP 593>LATITUDE -40.507833>LONGITUDE 167.6745) Reconstruction of intermediate water properties is important for understanding feedbacks within the ocean-climate system, particularly since these water masses are capable of driving high-low latitude teleconnections. Nevertheless, information about intermediate water mass evolution through the late Pleistocene remains limited. This paper examines changes in Antarctic Intermediate Water (AAIW), the most extensive intermediate water mass in the modern ocean through the last 400 kyr using the stable isotopic composition (d18O and d13C) and trace element concentration (Mg/Ca and B/Ca) of two benthic foraminiferal species from the same samples: epifaunal Planulina wuellerstorfi and infaunal Uvigerina peregrina. Our results confirm that the most reasonable estimates of AAIW temperature and D[CO32-] are generated by Mg/CaU. peregrina and B/CaP. wuellerstorfi, respectively. We present a 400 kyr record of intermediate water temperature and D[CO32-] from a sediment core from the Southwest Pacific (DSDP site 593; 40°30’S, 167°41’E, 1068 m water depth), which lies within the core of modern AAIW. Our results suggest that a combination of geochemical analyses on both infaunal and epifaunal benthic foraminiferal species yields important information about this critical water mass through the late Pleistocene. When combined with two nearby records of water properties from deeper depths, our data demonstrate that during interglacial stages of the late Pleistocene, AAIW and Circumpolar Deep Water (CPDW) have more similar water mass properties (temperature and d13C), while glacial stages are typified by dissimilar properties between AAIW and CPDW in the Southwest Pacific. Our new D[CO32-] record shows short time-scale variations, but a lack of coherent glacial-interglacial variability indicating that large quantities of carbon were not stored in intermediate waters during recent glacial periods. STUDY NOTES: Provided Keywords: Antarctic Intermediate Water, Deep Sea Drilling Program site 593, benthic foraminifera, stable isotopes, Mg/Ca, B/Ca NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Elmore, A.C. Investigator : McClymont, E.L. Investigator : Elderfield, H. Investigator : Kender, S. Investigator : Cook, M.R. Investigator : Leng, M.J. Investigator : Greaves, M. Investigator : Misra, S. 2015-06-29 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/18918 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/elmore2015/elmore2015-dsdp593z.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/elmore2015/elmore2015-dsdp593z.txt English https://www.ncdc.noaa.gov/paleo/study/18918 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/elmore2015/elmore2015-dsdp593z.txt Elmore, Aurora C., Erin L. McClymont, Henry Elderfield, Sev Kender, Michael R. Cook, Melanie J. Leng, Mervyn Greaves, and Sambuddha Misra2015Antarctic Intermediate Water properties since 400 ka recorded in infaunal (Uvigerina peregrina) and epifaunal (Planulina wuellerstorfi) benthic foraminiferaEarth and Planetary Science Letters428193-20310.1016/j.epsl.2015.07.013 START YEAR: 400000 cal yr BP * END YEAR: 0 cal yr BP 167.6745 -40.507833 167.6745 -40.507833