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Paleoceanography

Cover image for Paleoceanography

June 2011

Volume 26, Issue 2

  1. Regular Articles

    1. Top of page
    2. Regular Articles
    3. Paleoceanography Currents
    1. You have free access to this content
      Centennial- to millennial-scale ice-ocean interactions in the subpolar northeast Atlantic 18–41 kyr ago

      I. R. Hall, E. Colmenero-Hidalgo, R. Zahn, V. L. Peck and S. R. Hemming

      Article first published online: 30 JUN 2011 | DOI: 10.1029/2010PA002084

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      Key Points

      • Determine the evolution of the last glacial British-Irish Ice Sheet (BIIS)
      • Detemine the BIIS influce on surface ocean structure
      • Further understand millennial scale climate variability
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      Western equatorial Pacific deep water carbonate chemistry during the Last Glacial Maximum and deglaciation: Using planktic foraminiferal Mg/Ca to reconstruct sea surface temperature and seafloor dissolution

      Jennifer Fehrenbacher and Pamela Martin

      Article first published online: 30 JUN 2011 | DOI: 10.1029/2010PA002035

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      Key Points

      • Deep Pacific carbonate chemistry was lower during the LGM compared to the Modern
      • Changes in preservation and circulation have occurred over the last 25 kyr
      • Preservation was enhanced in this region during the deglaciation
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      The deglacial transition on the southeastern Alaska Margin: Meltwater input, sea level rise, marine productivity, and sedimentary anoxia

      M. H. Davies, A. C. Mix, J. S. Stoner, J. A. Addison, J. Jaeger, B. Finney and J. Wiest

      Article first published online: 29 JUN 2011 | DOI: 10.1029/2010PA002051

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      Key Points

      • Regional deglaciation of the northwest Cordilleran Ice Sheet
      • North Pacific observations of climate change
      • Potential drivers of deglacial high-productivity events
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      Radiocarbon-age differences among coexisting planktic foraminifera shells: The Barker Effect

      Wally Broecker and Elizabeth Clark

      Article first published online: 16 JUN 2011 | DOI: 10.1029/2011PA002116

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      Key Points

      • Dissolution and shell breakup leads to 14C age differences
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      Early Oligocene glaciation and productivity in the eastern equatorial Pacific: Insights into global carbon cycling

      Helen K. Coxall and Paul A. Wilson

      Article first published online: 11 JUN 2011 | DOI: 10.1029/2010PA002021

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      Key Points

      • New high resolution Eocene-Oligocene climate proxy data sets
      • Data provide new insight into the structure of E-O climate changes
      • Evidence for increased export production in the equatorial Pacific
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      Holocene climate variability of the Norwegian Atlantic Current during high and low solar insolation forcing

      K. S. Berner, N. Koç, F. Godtliebsen and D. Divine

      Article first published online: 11 JUN 2011 | DOI: 10.1029/2010PA002002

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      Key Points

      • Centennial- to millennial-scale variations in SST
      • Deep convection shutdown in the Nordic Sea
      • During HCO the SST show less consistent solar irradiance response
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      Coherent millennial-scale patterns in U37k′ and TEX86H temperature records during the penultimate interglacial-to-glacial cycle in the western Mediterranean

      Carme Huguet, Belen Martrat, Joan O. Grimalt, Jaap S. Sinninghe Damsté and Stefan Schouten

      Article first published online: 3 JUN 2011 | DOI: 10.1029/2010PA002048

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      Key Points

      • TEX86 reveals abrupt temperature changes in Alboran Sea
      • TEX86 temperatures coherent with other temperature proxies
      • Offset between proxies likely mainly due to seasonality
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      Environmental versus biological controls on Mg/Ca variability in Globigerinoides ruber (white) from core top and plankton tow samples in the southwest Pacific Ocean

      Annette Bolton, Joel A. Baker, Gavin B. Dunbar, Lionel Carter, Euan G. C. Smith and Helen L. Neil

      Article first published online: 3 JUN 2011 | DOI: 10.1029/2010PA001924

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      Key Points

      • Gs. ruber shows significantly depleted Mg in chamber F than chambers F-2 or F-1
      • Chamber specific Mg/Ca:T calibrations are an alternative to bulk calibrations
      • Results imply biological mechanism(s) control intra-Mg and inter-Mg distribution
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      Pliocene Indonesian Throughflow and Leeuwin Current dynamics: Implications for Indian Ocean polar heat flux

      Cyrus Karas, Dirk Nürnberg, Ralf Tiedemann and Dieter Garbe-Schönberg

      Article first published online: 1 JUN 2011 | DOI: 10.1029/2010PA001949

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      Key Points

      • Weakening of the Leeuwin Current since ∼3.3 Ma
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      A complete high-resolution Paleocene benthic stable isotope record for the central Pacific (ODP Site 1209)

      Thomas Westerhold, Ursula Röhl, Barbara Donner, Heather K. McCarren and James C. Zachos

      Article first published online: 26 MAY 2011 | DOI: 10.1029/2010PA002092

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      Key Points

      • High-resolution benthic foraminiferal stable isotope record for Paleocene Pacific
      • On the short term, orbital forcing is the pace maker for Paleocene paleoclimate
      • On the long term, close coupling of volcanic CO2 input and deep sea warming
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      Persistent El Niño–Southern Oscillation variation during the Pliocene Epoch

      N. Scroxton, S. G. Bonham, R. E. M. Rickaby, S. H. F. Lawrence, M. Hermoso and A. M. Haywood

      Article first published online: 26 MAY 2011 | DOI: 10.1029/2010PA002097

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      Key Points

      • ENSO-related interannual variability persists during the Pliocene
      • ENSO events are more regular in amplitude and frequency
      • The climatic mean state is characterized by a deeper thermocline
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      Hydrological variability in Florida Straits during Marine Isotope Stage 5 cold events

      André Bahr, Dirk Nürnberg, Joachim Schönfeld and Dieter Garbe-Schönberg

      Article first published online: 21 MAY 2011 | DOI: 10.1029/2010PA002015

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      Key Points

      • Stable surface conditions during MIS 5 in Florida Straits
      • Abrupt intermediate depth salinity increases during MIS 5 cold phases
      • Changing AAIW presence at Florida Straits during MIS 5
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      New age for ferromanganese crust 109D-C and implications for isotopic records of lead, neodymium, hafnium, and thallium in the Pliocene Indian Ocean

      Sune G. Nielsen, Abdelmouhcine Gannoun, Charles Marnham, Kevin W. Burton, Alex N. Halliday and James R. Hein

      Article first published online: 20 MAY 2011 | DOI: 10.1029/2010PA002003

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      Key Points

      • Redefine the age of Fe-Mn crust 109D-C from Indian Ocean
      • Thallium isotopes in Indian and Pacific identical over last 5 Myr
      • Radiogenic isotopes in 109D-C cannot be used to infer influence of NADW
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      Millennial variability and long-term changes of the diatom production in the eastern equatorial Pacific during the last glacial cycle

      Oscar E. Romero, Guillaume Leduc, Laurence Vidal and Gerhard Fischer

      Article first published online: 13 MAY 2011 | DOI: 10.1029/2010PA002099

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      Repeated pulses of vertical methane flux recorded in glacial sediments from the southeast Bering Sea

      Mea S. Cook, Lloyd D. Keigwin, Daniel Birgel and Kai-Uwe Hinrichs

      Article first published online: 11 MAY 2011 | DOI: 10.1029/2010PA001993

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      Key Points

      • There are multiple episodes of intense vertical methane flux in MIS3 sediments
      • The episodes have similar timing and duration as D-O events
      • These sites are too cold and deep for the Clathrate Gun Hypothesis
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      Simulating the impact of freshwater inputs and deep-draft icebergs formed during a MIS 6 Barents Ice Sheet collapse

      Clare L. Green, J. A. Mattias Green and Grant R. Bigg

      Article first published online: 11 MAY 2011 | DOI: 10.1029/2010PA002088

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      Key Points

      • The MOC is sensitive to the freshwater volume flux and the form of the input
      • The MIS 6 was more sensitive to large freshwater pulses than the MIS2 or present
      • Meltwater has large direct impact on the MOC, icebergs induce long-time effects
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      Ecological and temperature controls on Mg/Ca ratios of Globigerina bulloides from the southwest Pacific Ocean

      Julene P. Marr, Joel A. Baker, Lionel Carter, Aidan S. R. Allan, Gavin B. Dunbar and Helen C. Bostock

      Article first published online: 28 APR 2011 | DOI: 10.1029/2010PA002059

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      Key Points

      • Core-top Mg/Ca temperature calibrations by LA-ICPMS are reliable
      • Variability in Mg/Ca values of individual foraminifera reflect other controls
      • Mean weight and size-normalized weight of G. bulloides correlate with ocean temp
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      Constraints on glaciation in the middle Eocene (46–37 Ma) from Ocean Drilling Program (ODP) Site 1209 in the tropical Pacific Ocean

      Caroline F. Dawber and Aradhna K. Tripati

      Article first published online: 27 APR 2011 | DOI: 10.1029/2010PA002037

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      Key Points

      • New constraints on the timing of the establishment of the Cenozoic cryosphere
      • Evidence for glaciation during a period characterized by high pCO2
      • Evidence supporting Eocene continental ice storage in both hemispheres
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      Late Eemian warming in the Nordic Seas as seen in proxy data and climate models

      A. Born, K. H. Nisancioglu and B. Risebrobakken

      Article first published online: 22 APR 2011 | DOI: 10.1029/2010PA002027

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      Key Points

      • A reorganization of surface currents warmed the Nordic Seas after the Eemian
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      Deep water temperature, carbonate ion, and ice volume changes across the Eocene-Oligocene climate transition

      A. E. Pusz, R. C. Thunell and K. G. Miller

      Article first published online: 21 APR 2011 | DOI: 10.1029/2010PA001950

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      Key Points

      • Bottom waters cooled by ∼2.0[deg]C across EOT-1 and by ∼1.5[deg]C across Oi-1
      • The mean eustatic lowering associated with Oi-1 is equivalent to ∼70 m
      • Ice volume growth across Oi-1 was equal to 90% of the modern Antarctic ice sheet
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      Regional climate variability in the western subtropical North Atlantic during the past two millennia

      Casey Saenger, Rosemarie E. Came, Delia W. Oppo, Lloyd D. Keigwin and Anne L. Cohen

      Article first published online: 21 APR 2011 | DOI: 10.1029/2010PA002038

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      Key Points

      • Regional climate differs from commonly present hemispheric trends
      • The MCA and LIA are not synchronous features of North Atlantic climate
      • Incorporating salinity may improve paleoclimate records based on foram Mg/Ca
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      Exploring preserved fossil dinoflagellate and haptophyte DNA signatures to infer ecological and environmental changes during deposition of sapropel S1 in the eastern Mediterranean

      Arjan C. Boere, W. Irene C. Rijpstra, Gert J. de Lange, Elisa Malinverno, Jaap S. Sinninghe Damsté and Marco J. L. Coolen

      Article first published online: 16 APR 2011 | DOI: 10.1029/2010PA001948

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      Key Points

      • Fossil DNA is successfully preserved in marine sediments
      • Fossil DNA can be use to help reconstruct paleoenvironmental conditions
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      Mg/Ca of Globorotalia inflata as a recorder of permanent thermocline temperatures in the South Atlantic

      Jeroen Groeneveld and Cristiano M. Chiessi

      Article first published online: 14 APR 2011 | DOI: 10.1029/2010PA001940

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      Key Points

      • Mg/Ca-calicification temperature calibration for Globorotalia inflata is presented
      • G. inflata represents water temperatures for the permanent thermocline (350–400 m)
      • State of encrustation can introduce large biases in reconstructed temperatures
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      Great Barrier Reef coral luminescence reveals rainfall variability over northeastern Australia since the 17th century

      Janice M. Lough

      Article first published online: 6 APR 2011 | DOI: 10.1029/2010PA002050

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      Key Points

      • Coral luminescence used to reconstruct tropical rainfall
      • Drier and less variable rainfall late 18th to mid-19th centuries
      • Increase in rainfall variability and extremes since late 19th century
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      Testing the impact of seasonal phytodetritus deposition on δ13C of epibenthic foraminifer Cibicidoides wuellerstorfi: A 31,000 year high-resolution record from the northwest African continental slope

      Michelle Zarriess and Andreas Mackensen

      Article first published online: 6 APR 2011 | DOI: 10.1029/2010PA001944

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      Key Points

      • Delta13C lowering during seasonal phytodetritus deposition
  2. Paleoceanography Currents

    1. Top of page
    2. Regular Articles
    3. Paleoceanography Currents
    1. You have free access to this content
      Early arrival of Southern Source Water in the deep North Atlantic prior to Heinrich event 2

      Marcus Gutjahr and Jörg Lippold

      Article first published online: 25 JUN 2011 | DOI: 10.1029/2011PA002114

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      Key Points

      • North Atlantic Deep Water ventilated the deep N Atlantic during early MIS 2
      • Deep and intermediate water changes preceded Heinrich event 2
      • Heinrich event 2 was the result and not the cause for AMOC changes

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