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Paleoceanography

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September 2011

Volume 26, Issue 3

  1. Regular Articles

    1. Top of page
    2. Regular Articles
    1. You have free access to this content
      Water isotopologues as a quantitative paleosalinity proxy

      Allegra N. LeGrande and Gavin A. Schmidt

      Article first published online: 30 SEP 2011 | DOI: 10.1029/2010PA002043

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      Key Points

      • The d18Osw-Sal method for paleosalinity reconstruction has large errors
      • Paleosalinity reconstruction is improved by using paired dD and d18Osw
      • Percent biases for the d18Osw-salinity method are provided
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      Comment on “What do we know about the evolution of Mg to Ca ratios in seawater?” by Wally Broecker and Jimin Yu

      Rosalind M. Coggon, Damon A. H. Teagle and Tom Dunkley Jones

      Article first published online: 27 SEP 2011 | DOI: 10.1029/2011PA002186

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      A box model of the Late Miocene Mediterranean Sea: Implications from combined 87Sr/86Sr and salinity data

      R. P. M. Topper, R. Flecker, P. Th. Meijer and M. J. R. Wortel

      Article first published online: 21 SEP 2011 | DOI: 10.1029/2010PA002063

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      Assessing El Niño Southern Oscillation variability during the past millennium

      D. Khider, L. D. Stott, J. Emile-Geay, R. Thunell and D. E. Hammond

      Article first published online: 15 SEP 2011 | DOI: 10.1029/2011PA002139

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      Key Points

      • Single specimens of foraminifera are used as recorders of ENSO variability
      • ENSO has remained remarkably constant over the past millennium
      • MCA characterized by departures toward stronger/more frequent La Nina
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      Millennial-scale sea surface temperature and Patagonian Ice Sheet changes off southernmost Chile (53°S) over the past ∼60 kyr

      M. Caniupán, F. Lamy, C. B. Lange, J. Kaiser, H. Arz, R. Kilian, O. Baeza Urrea, C. Aracena, D. Hebbeln, C. Kissel, C. Laj, G. Mollenhauer and R. Tiedemann

      Article first published online: 15 SEP 2011 | DOI: 10.1029/2010PA002049

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      Key Points

      • Glacial millennial-scale paleoceanographic changes in the southeast Pacific
      • Antarctic timing and structure of SSTs and d18O very similar to ODP site 1233
      • Northward shift of Southern Ocean fronts and the opal belt during cold periods
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      Reconstructing the thermal structure of the upper ocean: Insights from planktic foraminifera shell chemistry and alkenones in modern sediments of the tropical eastern Indian Ocean

      Mahyar Mohtadi, Delia W. Oppo, Andreas Lückge, Ricardo DePol-Holz, Stephan Steinke, Jeroen Groeneveld, Nils Hemme and Dierk Hebbeln

      Article first published online: 10 SEP 2011 | DOI: 10.1029/2011PA002132

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      Key Points

      • Providing critical tools for reconstructing monsoon, ENSO, and IOD
      • Modern calibration of planktic foraminifera and alkenones
      • Temperature calibration for G. tumida
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      A model-data comparison of δ13C in the glacial Atlantic Ocean

      T. Hesse, M. Butzin, T. Bickert and G. Lohmann

      Article first published online: 10 SEP 2011 | DOI: 10.1029/2010PA002085

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      Key Points

      • LGM North Atlantic overturning circulation was reduced and shoaled
      • Southern Ocean freshwater balance is crucial for understanding glacial climate
      • Comprehensive delta13C data set presents solid base for model-data comparison
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      Mg/Ca ratios of single planktonic foraminifer shells and the potential to reconstruct the thermal seasonality of the water column

      Tim Haarmann, Ed C. Hathorne, Mahyar Mohtadi, Jeroen Groeneveld, Martin Kölling and Torsten Bickert

      Article first published online: 9 SEP 2011 | DOI: 10.1029/2010PA002091

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      Key Points

      • G. ruber (pink) Mg/Ca ratios exhibit a strong seasonality
      • G. inflata Mg/Ca ratios are remarkably similar throughout the year
      • Mg/Ca range changes >0.34–0.80 mmol/mol are indicative of environmental change
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      A two-parameter stochastic process for Dansgaard-Oeschger events

      H. Braun, P. Ditlevsen, J. Kurths and M. Mudelsee

      Article first published online: 7 SEP 2011 | DOI: 10.1029/2011PA002140

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      Key Points

      • Timing of DO events is inconsistent with a specific one-parameter random process
      • We propose a new, two-parameter stochastic process for the timing of DO events
      • Standard methods cannot distinguish between random and solar-induced DO events
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      The response of the Walker circulation to Last Glacial Maximum forcing: Implications for detection in proxies

      P. N. DiNezio, A. Clement, G. A. Vecchi, B. Soden, A. J. Broccoli, B. L. Otto-Bliesner and P. Braconnot

      Article first published online: 26 AUG 2011 | DOI: 10.1029/2010PA002083

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      Key Points

      • The Walker circulation strengthens in LGM simulations due to tropical cooling
      • Walker circulation weakens due to changes in land-sea distance due to lower sea level
      • Only thermocline proxies can unambiguously detect changes in the Walker circulation
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      Stable carbon isotope patterns of marine biomarker lipids in the Arctic Ocean during Eocene Thermal Maximum 2

      Petra L. Schoon, Appy Sluijs, Jaap S. Sinninghe Damsté and Stefan Schouten

      Article first published online: 25 AUG 2011 | DOI: 10.1029/2010PA002028

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      Key Points

      • Increased carbon isotopic fractionation of primary producers
      • High pCO2 levels during ETM2
      • Increased productivity causes enhanced stratification
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      Miocene to Pliocene development of surface and subsurface temperatures in the Benguela Current system

      Florian Rommerskirchen, Tegan Condon, Gesine Mollenhauer, Lydie Dupont and Enno Schefuss

      Article first published online: 25 AUG 2011 | DOI: 10.1029/2010PA002074

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      Key Points

      • Miocene to Pliocene SST reconstruction of the Benguela Current by two proxies
      • Variations in water temperatures driven by inflow of cold Antarctic waters
      • Subsurface and surface temperature dependency on Atlantic overturning circulation
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      The timing of deglacial circulation changes in the Atlantic

      C. Waelbroeck, L. C. Skinner, L. Labeyrie, J.-C. Duplessy, E. Michel, N. Vazquez Riveiros, J.-M. Gherardi and F. Dewilde

      Article first published online: 19 AUG 2011 | DOI: 10.1029/2010PA002007

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      Key Points

      • Benthic d18O can't be used as global correlation tool with millennial-scale precision
      • Independently dated benthic d18O records provide information on circulation changes
      • Arrival of d18O-depleted meltwater took place later at deeper North Atlantic sites
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      A mechanism for brief glacial episodes in the Mesozoic greenhouse

      Yannick Donnadieu, Gilles Dromart, Yves Goddéris, Emmanuelle Pucéat, Benjamin Brigaud, Guillaume Dera, Christophe Dumas and Nicolas Olivier

      Article first published online: 17 AUG 2011 | DOI: 10.1029/2010PA002100

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      Key Points

      • Global climate carbon cycle modeling
      • Brief glacial episodes of the Mesozoic
      • Jurassic ice sheet
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      Oceanic calcium changes from enhanced weathering during the Paleocene-Eocene thermal maximum: No effect on calcium-based proxies

      N. Komar and R. E. Zeebe

      Article first published online: 10 AUG 2011 | DOI: 10.1029/2010PA001979

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      Key Points

      • The magnitude of change in calcium ion conc. during the PETM and Ca proxies
      • Effect of different ranges of carbon input scenarios on Ca concentration
      • Ca ion change during the PETM not large enough to affect the Ca-based proxies
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      Productivity collapses in the Arabian Sea during glacial cold phases

      Arun Deo Singh, Simon J. A. Jung, Kate Darling, Raja Ganeshram, Tara Ivanochko and Dick Kroon

      Article first published online: 3 AUG 2011 | DOI: 10.1029/2009PA001923

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      Key Points

      • Synchronous millennial-scale productivity change in the Arabian Sea
      • Glacial-interglacial productivity change
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      Climate simulations of the Permian-Triassic boundary: Ocean acidification and the extinction event

      A. Montenegro, P. Spence, K. J. Meissner, M. Eby, M. J. Melchin and S. T. Johnston

      Article first published online: 2 AUG 2011 | DOI: 10.1029/2010PA002058

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      Key Points

      • Modeled Permian-Triassic boundary ocean shows no widespread anoxia
      • Model shows very low surface ocean pH during Permian-Triassic boundary
      • Modeled compared well with paleoproxies
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      Nitrogen isotopic relationship between diatom-bound and bulk organic matter of cultured polar diatoms

      Matthew G. Horn, Rebecca S. Robinson, Tatiana A. Rynearson and Daniel M. Sigman

      Article first published online: 2 AUG 2011 | DOI: 10.1029/2010PA002080

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      Key Points

      • Delta15N of NO3>bulk>DB in cultured diatoms with species-specific epsilon and delta15NDBoffset
      • Epsilon and delta15NDBoffset are closely related to one another and to cell size and SA:V
      • Reconstructions using delta15NDB need to include species-specific assemblage data
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      Diverse patterns of ocean export productivity change across the Cretaceous-Paleogene boundary: New insights from biogenic barium

      Pincelli M. Hull and Richard D. Norris

      Article first published online: 30 JUL 2011 | DOI: 10.1029/2010PA002082

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      Key Points

      • Ocean export productivity did not decline globally following the K-Pg impact
      • Export productivity recovered asynchronously in sites globally
      • Regional recovery of export productivity uncorrelated global pelagic diversity
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      Planktonic foraminiferal oxygen isotope analysis by ion microprobe technique suggests warm tropical sea surface temperatures during the Early Paleogene

      Reinhard Kozdon, D. Clay Kelly, Noriko T. Kita, John H. Fournelle and John W. Valley

      Article first published online: 30 JUL 2011 | DOI: 10.1029/2010PA002056

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      Key Points

      • Muricae largely preserve their original d18O value
      • Robust SSTs can be reconstructed from frosty foraminifers using SIMS
      • Muricae d18O values are in agreement with model predictions for the PETM event
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      Multiple-stage deglacial retreat of the southern Greenland Ice Sheet linked with Irminger Current warm water transport

      Paul C. Knutz, Marie-Alexandrine Sicre, Hanne Ebbesen, Sarah Christiansen and Antoon Kuijpers

      Article first published online: 30 JUL 2011 | DOI: 10.1029/2010PA002053

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      Key Points

      • A triple-phase deglaciation of the south Greenland continental margins
      • Ice shelf collapse related to subsurface heat transport by the Irminger Current
      • Younger Dryas cooling triggered by a Greenland Ice Sheet meltwater pulse
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      What do we know about the evolution of Mg to Ca ratios in seawater?

      Wally Broecker and Jimin Yu

      Article first published online: 29 JUL 2011 | DOI: 10.1029/2011PA002120

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      Key Points

      • It appears that the Mg to Ca ratio in seawater has increased
      • But it is not clear by how much the Mg to Ca ratio in seawater has increased
      • Mg content of ridge crest basalts is an unreliable proxy for the Mg to Ca ratio
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      Persisting maximum Agulhas leakage during MIS 14 indicated by massive Ethmodiscus oozes in the subtropical South Atlantic

      Nick Rackebrandt, Henning Kuhnert, Jeroen Groeneveld and Torsten Bickert

      Article first published online: 26 JUL 2011 | DOI: 10.1029/2010PA001990

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      Key Points

      • Maximum Agulhas leakage caused massive South Atlantic Ethmodiscus oozes
      • Agulhas rings were favorable environment for buoyant giant diatom E. rex
      • Agulhas rings led to shift from calcareous nannoplankton to diatom production
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      Black shale deposition, atmospheric CO2 drawdown, and cooling during the Cenomanian-Turonian Oceanic Anoxic Event

      Ian Jarvis, John S. Lignum, Darren R. Gröcke, Hugh C. Jenkyns and Martin A. Pearce

      Article first published online: 19 JUL 2011 | DOI: 10.1029/2010PA002081

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      Key Points

      • Delta13C variation through OAE2 is a viable pCO2 proxy
      • Drawdown of pCO2 accompanied organic carbon burial during OAE2
      • A major driver of Late Cretaceous global climate change was pCO2

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