noaa-ocean-20225 Southwest Pacific Isotope, Chemistry and Alkenone Data: Surface and Intermediate Water Temperature Reconstructions over the last 3.5 Ma McClymont, E.L.; Elmore, A.C.; Kender, S.; Leng, M.J.; Greaves, M.; Elderfield, H. Southwest Pacific Isotope, Chemistry and Alkenone Data: Surface and Intermediate Water Temperature Reconstructions over the last 3.5 Ma 2016-06-02 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/20225 Investigator E.L. McClymont Investigator A.C. Elmore Investigator S. Kender Investigator M.J. Leng Investigator M. Greaves Investigator H. Elderfield earth science paleoclimate climate reconstructions|paleoceanography sea surface temperature,alkenone unsaturation index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,UK'37 = 0.033T + 0.044; calculated using Mueller et al. (1998) UK'37 calibration earth science paleoclimate climate reconstructions|paleoceanography sea water temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,intermediate water temperature calculated using Elderfield et al. (2010) Mg/Ca calibration for Uvigerina peregrina earth science paleoclimate paleoceanography delta 18O,Cibicidoides wuellerstorfi,null,per mil VPDB,null,paleoceanography,null,inductively-coupled plasma mass spectrometry,N,null earth science paleoclimate paleoceanography alkenone unsaturation index Uk37 prime,null,null,dimensionless,null,paleoceanography,null,gas chromatography|isotope ratio mass spectrometry,N,original UK'37 values used to quantify sea surface temperatures earth science paleoclimate paleoceanography magnesium/calcium,Uvigerina peregrina,null,unspecified unit,null,paleoceanography,null,null,N,original Mg/Ca values used to calculate intermediate water temperatures earth science paleoclimate paleoceanography age,null,null,million years ago,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography alkenone,dry sediment,null,microgram per gram,null,paleoceanography,null,gas chromatography|isotope ratio mass spectrometry,N,null earth science paleoclimate paleoceanography delta 13C,Cibicidoides wuellerstorfi,null,per mil VPDB,null,paleoceanography,null,inductively-coupled plasma mass spectrometry,N,null earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,null,null,N,mbsf earth science paleoclimate paleocean trace metals in carbonates earth science paleoclimate paleocean biomarkers earth science paleoclimate paleocean oxygen isotopes earth science paleoclimate paleocean reconstruction geoscientificInformation 3495500 cal yr BP 0 cal yr BP Complete -40.507833 -40.507833 167.6745 167.6745 -1068 -1068 Ocean Pacific Ocean South Pacific Ocean DSDP 593>LATITUDE -40.507833>LONGITUDE 167.6745 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII McClymont, E.L., A.C. Elmore, S. Kender, M.J. Leng, M. Greaves, and H. Elderfield 2016 Paleoceanography 31 10.1002/2016PA002954 Elmore, Aurora C., Erin L. McClymont, Henry Elderfield, Sev Kender, Michael R. Cook, Melanie J. Leng, Mervyn Greaves, and Sambuddha Misra 2015 Earth and Planetary Science Letters 428 193-203 10.1016/j.epsl.2015.07.013 Kender, S., E.L. McClymont, A.C. Elmore, D. Emanuele, M.J. Leng, and H. Elderfield 2016 Nature Communications 7 10.1038/ncomms11970

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: Alkenone sea-surface temperature (SST) and benthic foraminifera Mg/Ca ratios are presented from DSDP Site 593 across the late Pliocene and Pleistocene (0-3.5 Ma). The data record changes in the position of the subtropical front in the Tasman Sea, and Antarctic Intermediate Water temperatures. The results indicate long-term patterns of subtropical front displacement and changes to surface ocean conditions in the Subantarctic zone, linked to global transitions towards the larger and longer-duration glacial-interglacial cycles of the mid and late Pleistocene.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mcclymont2016/mcclymont2016-dsdp593.txt Formatted Text File; DSDP 593 Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11