Paleoceanography

Cover image for Paleoceanography

December 2012

Volume 27, Issue 4

  1. Regular Articles

    1. Top of page
    2. Regular Articles
    1. Integrated stratigraphy of the Paleocene-Eocene thermal maximum in the New Jersey Coastal Plain: Toward understanding the effects of global warming in a shelf environment

      Peter Stassen, Ellen Thomas and Robert P. Speijer

      Article first published online: 22 DEC 2012 | DOI: 10.1029/2012PA002323

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      Key Points

      • Correlating the PETM along a depth gradient
      • Creation of an age model
      • Detailed accumulation rates
    2. El Niño–Southern Oscillation extrema in the Holocene and Last Glacial Maximum

      Athanasios Koutavas and Stephan Joanides

      Article first published online: 15 DEC 2012 | DOI: 10.1029/2012PA002378

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      Key Points

      • Holocene and LGM ENSO were reconstructed from individual foraminifera
      • Maximum and minimum ENSO activity occurred in the LGM and Mid-Holocene
      • Shifts in variability were accompanied by coordinated shifts in the mean state
    3. Nutrients as the dominant control on the spread of anoxia and euxinia across the Cenomanian-Turonian oceanic anoxic event (OAE2): Model-data comparison

      F. M. Monteiro, R. D. Pancost, A. Ridgwell and Y. Donnadieu

      Article first published online: 15 DEC 2012 | DOI: 10.1029/2012PA002351

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      Key Points

      • Model-data comparison suggests that OAE2 was quasi-global
      • Enhanced marine productivity drove most of OAE2 spread of anoxia and euxinia
      • Paleogeography preconditioned black shale deposition in the proto-North Atlantic
    4. Early mid-Holocene SST variability and surface-ocean water balance in the southwest Pacific

      N. Duprey, C. E. Lazareth, T. Corrège, F. Le Cornec, C. Maes, N. Pujol, M. Madeng-Yogo, S. Caquineau, C. Soares Derome and G. Cabioch

      Article first published online: 17 NOV 2012 | DOI: 10.1029/2012PA002350

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      Key Points

      • The WPWP southern edge was located at its current location at 6.7-6.5 ka BP
      • Precipitation were decoupled from the SPCZ influence at 6.2-6.0 ka BP
      • ENSO variability was 20%-30% lower than it is today in the Southwest Pacific
    5. Oceanic carbon and water masses during the Mystery Interval: A model-data comparison study

      W. N. Huiskamp and K. J. Meissner

      Article first published online: 14 NOV 2012 | DOI: 10.1029/2012PA002368

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      Key Points

      • Southward shift in SH westerlies results in deep ocean carbon redistribution
      • Model accounts for roughly half of change in atmospheric CO2 and 14C
      • Location of oldest water masses likely in North Pacific or Southern Ocean
    6. Deep time foraminifera Mg/Ca paleothermometry: Nonlinear correction for secular change in seawater Mg/Ca

      David Evans and Wolfgang Müller

      Article first published online: 10 NOV 2012 | DOI: 10.1029/2012PA002315

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      Key Points

      • Previously reported 'deep-time' foraminifera Mg/Ca temperatures are inaccurate
      • This results from an erroneous linear correction for seawater Mg/Ca variation
      • We show this via an example and detail an appropriate nonlinear correction
    7. Vital effects in coccolith calcite: Cenozoic climate-pCO2 drove the diversity of carbon acquisition strategies in coccolithophores?

      Clara T. Bolton, Heather M. Stoll and Ana Mendez-Vicente

      Article first published online: 3 NOV 2012 | DOI: 10.1029/2012PA002339

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      Key Points

      • No coccolith stable isotope vital effects during PETM in well preserved site
      • Clear >1.5 permil range of coccolith vital effects since at least 3.5 Ma
      • Trend between cell size and C and O isotopic enrichment during Plio-Pleistocene
    8. A review of nitrogen isotopic alteration in marine sediments

      Rebecca S. Robinson, Markus Kienast, Ana Luiza Albuquerque, Mark Altabet, Sergio Contreras, Ricardo De Pol Holz, Nathalie Dubois, Roger Francois, Eric Galbraith, Ting-Chang Hsu, Tara Ivanochko, Samuel Jaccard, Shuh-Ji Kao, Thorsten Kiefer, Stephanie Kienast, Moritz Lehmann, Philippe Martinez, Matthew McCarthy, Jürgen Möbius, Tom Pedersen, Tracy M. Quan, Evgeniya Ryabenko, Andreas Schmittner, Ralph Schneider, Aya Schneider-Mor, Masahito Shigemitsu, Dan Sinclair, Christopher Somes, Anja Studer, Robert Thunell and Jin-Yu Yang

      Article first published online: 23 OCT 2012 | DOI: 10.1029/2012PA002321

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      Key Points

      • Use of sedimentary nitrogen isotopes is examined
      • On average, sediment 15N/14N increases approx. 2 per mil during early burial
      • Isotopic alteration scales with water depth
    9. Sea surface temperature variability in the Pacific sector of the Southern Ocean over the past 700 kyr

      Sze Ling Ho, Gesine Mollenhauer, Frank Lamy, Alfredo Martínez-Garcia, Mahyar Mohtadi, Rainer Gersonde, Dierk Hebbeln, Samuel Nunez-Ricardo, Antoni Rosell-Melé and Ralf Tiedemann

      Article first published online: 12 OCT 2012 | DOI: 10.1029/2012PA002317

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      Key Points

      • UK37 is a better SST proxy than UK'37 in the Southern Ocean
      • Pleistocene glacial cooling of 8C in the subantarctic Pacific
      • Substantial equatorward shifts of ACC and intensified PCC during glacials
    10. Deciphering the role of southern gateways and carbon dioxide on the onset of the Antarctic Circumpolar Current

      Vincent Lefebvre, Yannick Donnadieu, Pierre Sepulchre, Didier Swingedouw and Zhong-Shi Zhang

      Article first published online: 11 OCT 2012 | DOI: 10.1029/2012PA002345

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      Key Points

      • We depict the influence of the Cenozoic CO2 lowering on the ACC onset
      • The ACC can be seen as a feedback of the long-term Cenozoic cooling
      • Low CO2 levels are required to allow a strong circumpolar circulation

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