Bay of Plenty, New Zealand Deglacial Planktonic Stable Isotope Data Schiraldi Jr., B.; Sikes, E.L.; Elmore, A.C.; Cook, M.S.; Rose, K.A. Schiraldi Jr., B. Sikes, E.L. Elmore, A.C. Cook, M.S. Rose, K.A. Last Glacial Maximum earth science/paleoclimate/paleoceanography (delta 18O,Globigerina bulloides,null,per mil PDB,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 (delta 13C,Globigerina bulloides,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 13C,Globorotalia inflata,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Globorotalia inflata,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (RR0503-87JPC>LATITUDE -37.2635>LONGITUDE 176.6643) (RR0503-64JPC>LATITUDE -37.4223>LONGITUDE 177.0023) (RR0503-79JPC>LATITUDE -36.9587>LONGITUDE 176.5928) (RR0503-125JPC>LATITUDE -36.1983>LONGITUDE 176.8892) This study examined sources of mixed layer and shallow subsurface waters in the subtropical Bay of Plenty, New Zealand, across the last deglaciation (~30-5 ka). d18O and d13C from planktonic foraminifera Globgerinoides bulloides and Globorotalia inflata in four sediment cores were used to reconstruct surface mixed layer thickness, d18O of seawater (d18OSW) and differentiate between high- and low-latitude water provenance. During the last glaciation, depleted planktonic d18OSW and enriched d13C (-0.4-0.1 per mil) indicate surface waters had Southern Ocean sources. A rapid d13C depletion of ~1 per mil in G. bulloides between 20 and 19 ka indicates an early, permanent shift in source to a more distal tropical component, likely with an equatorial Pacific contribution that persisted into the Holocene. At 18 ka, a smaller but similar shift in G. inflata d13C depletion of ~0.3 per mil suggests that deeper subsurface waters had a delayed reaction to changing conditions during the deglaciation. This contrasts with the isotopic records from nearby Hawke Bay, to the east of the North Island of New Zealand, which exhibited several changes in thermocline depth indicating switches between distal subtropical and proximal subantarctic influences during the early deglaciation ending only after the Antarctic Cold Reversal. Our results identify the midlatitude subtropics, such as the area around the North Island of New Zealand, as a key region to decipher high- versus low-latitude influences in Southern Hemisphere shallow water masses. STUDY NOTES: Stable isotope (d18O and d13C) from planktonic foraminifera (G. inflata and G. bulloides) in 4 sediment cores collected in the Bay of Plenty, New Zealand for the deglacial interval (~30 - 5 KYrBP). NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Schiraldi Jr., B. Investigator : Sikes, E.L. Investigator : Elmore, A.C. Investigator : Cook, M.S. Investigator : Rose, K.A. 2016-08-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/20365 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schiraldi2014/schiraldi2014jpc125.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schiraldi2014/schiraldi2014jpc79.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schiraldi2014/schiraldi2014jpc87.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schiraldi2014/schiraldi2014jpc64.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schiraldi2014/schiraldi2014jpc125.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schiraldi2014/schiraldi2014jpc79.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schiraldi2014/schiraldi2014jpc87.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schiraldi2014/schiraldi2014jpc64.txt English https://www.ncdc.noaa.gov/paleo/study/20365 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schiraldi2014/schiraldi2014jpc125.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schiraldi2014/schiraldi2014jpc79.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schiraldi2014/schiraldi2014jpc87.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schiraldi2014/schiraldi2014jpc64.txt Benedetto Schiraldi Jr., Elisabeth L. Sikes, Aurora C. Elmore, Mea S. Cook, Kathryn A. Rose 2014Southwest Pacific subtropics responded to last deglacial warming with changes in shallow water sourcesPaleoceanography296595-61110.1002/2013PA002584http://onlinelibrary.wiley.com/doi/10.1002/2013PA002584/full START YEAR: 28022 cal yr BP * END YEAR: 0 cal yr BP 176.5928 -37.4223 177.0023 -36.1983