Journal of Geophysical Research: Oceans (1978–2012)

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      Impact of sea-ice biology on overall primary production in a biophysical model of the pan-Arctic Ocean

      Frédéric Dupont

      Version of Record online: 29 AUG 2012 | DOI: 10.1029/2011JC006983

      Key Points

      • Sea-ice biology contributes significantly to the Arctic primary production
      • Marginal impact of ice algae on total primary production or nutricline
      • Overall production will increase with declining ice but longer term is uncertain
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      Arctic Ocean freshwater: How robust are model simulations?

      A. Jahn, Y. Aksenov, B. A. de Cuevas, L. de Steur, S. Häkkinen, E. Hansen, C. Herbaut, M.-N. Houssais, M. Karcher, F. Kauker, C. Lique, A. Nguyen, P. Pemberton, D. Worthen and J. Zhang

      Version of Record online: 10 AUG 2012 | DOI: 10.1029/2012JC007907

      Key Points

      • Hindcast simulations of the Arctic freshwater budget show differences
      • The main deficiencies of the simulations are differences in the salinity field
      • Solid freshwater exports show a better agreement than liquid freshwater exports
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      Recent changes in Arctic Ocean circulation revealed by iodine-129 observations and modeling

      Michael Karcher, John N. Smith, Frank Kauker, Rüdiger Gerdes and William M. Smethie Jr.

      Version of Record online: 3 AUG 2012 | DOI: 10.1029/2011JC007513

      Key Points

      • Model simulates dispersion of tracer 129 I in the Arctic Ocean
      • Tracer 129 I outlines changes in Arctic Ocean circulation over last decades
      • Middepth Atlantic Water circulation in Canadian Basin breaks down after 2004
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      Ridged sea ice characteristics in the Arctic from a coupled multicategory sea ice model

      S. Mårtensson, H. E. M. Meier, P. Pemberton and J. Haapala

      Version of Record online: 14 APR 2012 | DOI: 10.1029/2010JC006936

      Key Points

      • Multicategory sea ice dynamics improve thickness and variability signficantly
      • Explicit deformed categories allow for improved understanding of the sea ice
      • A relocation of ridged ice toward the central Arctic during the years 1980-2000
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      Evaluation and control mechanisms of volume and freshwater export through the Canadian Arctic Archipelago in a high-resolution pan-Arctic ice-ocean model

      Timothy McGeehan and Wieslaw Maslowski

      Version of Record online: 30 MAR 2012 | DOI: 10.1029/2011JC007261

      Key Points

      • A new mechanism controlling volume fluxes through CAA is described.
      • Seasonal and interannual variability of volume and freshwater fluxes is examined
      • Model flux estimates are validated with available observations
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      Evaluation of Arctic sea ice thickness simulated by Arctic Ocean Model Intercomparison Project models

      Mark Johnson, Andrey Proshutinsky, Yevgeny Aksenov, An T. Nguyen, Ron Lindsay, Christian Haas, Jinlun Zhang, Nikolay Diansky, Ron Kwok, Wieslaw Maslowski, Sirpa Häkkinen, Igor Ashik and Beverly de Cuevas

      Version of Record online: 15 MAR 2012 | DOI: 10.1029/2011JC007257

      Key Points

      • Evaluated models underestimate the thickness of thicker ice
      • Evaluated models overestimate the thickness of thin ice
      • Ice dynamical processes in regions of fast ice need to be improved
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      What controls primary production in the Arctic Ocean? Results from an intercomparison of five general circulation models with biogeochemistry

      Ekaterina E. Popova, Andrew Yool, Andrew C. Coward, Frederic Dupont, Clara Deal, Scott Elliott, Elizabeth Hunke, Meibing Jin, Mike Steele and Jinlun Zhang

      Version of Record online: 31 JAN 2012 | DOI: 10.1029/2011JC007112

      Key Points

      • Models show similar features in terms of the distribution of primary production
      • However, physical factors controlling this distribution differ between the models
      • Models disagree about which factors, light or nutrients, control present productivity
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      On the structure and dynamical features of intrusive layering in the Eurasian Basin in the Arctic Ocean

      Natalia Kuzmina, Bert Rudels, Victor Zhurbas and Tapani Stipa

      Version of Record online: 31 DEC 2011 | DOI: 10.1029/2010JC006920

      Key Points

      • Different types of intrusive layers and fronts in the Arctic are analyzed
      • Lateral and vertical diffusivity are estimated from interleaving models
      • Baroclinicity effect on stable-stable stratification interleaving is treated
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      Volume and freshwater transports through the Canadian Arctic Archipelago–Baffin Bay system

      Bert Rudels

      Version of Record online: 2 NOV 2011 | DOI: 10.1029/2011JC007019

      Key Points

      • Estimates of transports through Baffin Bay based on rotational control
      • Mass and salt balance for Baffin Bay
      • Possible effects of increased Greenland melt on the Baffin Bay exchanges
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      Effects of parameterized eddy stress on volume, heat, and freshwater transports through Fram Strait

      Zeliang Wang, Greg Holloway and Charles Hannah

      Version of Record online: 25 OCT 2011 | DOI: 10.1029/2010JC006871

      Key Points

      • Neptune helps strengthen volume exchanges both to and from the Arctic
      • Neptune increases northward heat transport while limiting southward freshwater export
      • Neptune has little impact on temporal variability of transports
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      Oceans and ocean models as seen by current meters

      Greg Holloway, An Nguyen and Zeliang Wang

      Version of Record online: 4 OCT 2011 | DOI: 10.1029/2011JC007044

      Key Points

      • Oceans are characterized by tendency for positive topostrophy, esp. at high lat
      • Finer grid eddying models can achieve better skill and higher topostrophy
      • Coarse grid, noneddying models can improve by eddy parameterization
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      IPCC climate models do not capture Arctic sea ice drift acceleration: Consequences in terms of projected sea ice thinning and decline

      P. Rampal, J. Weiss, C. Dubois and J.-M. Campin

      Version of Record online: 29 SEP 2011 | DOI: 10.1029/2011JC007110

      Key Points

      • IPCC climate models underestimate Arctic sea ice thinning
      • IPCC climate models fail to capture the recent sea ice kinematics acceleration
      • Ice export may play a stronger role in the sea ice mass balance in the Arctic
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      Uncertainty in modeled Arctic sea ice volume

      Axel Schweiger, Ron Lindsay, Jinlun Zhang, Mike Steele, Harry Stern and Ron Kwok

      Version of Record online: 27 SEP 2011 | DOI: 10.1029/2011JC007084

      Key Points

      • Uncertainty of the modeled Arctic sea ice volume and its trend
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      Observational assessment of Arctic Ocean sea ice motion, export, and thickness in CMIP3 climate simulations

      R. Kwok

      Version of Record online: 24 SEP 2011 | DOI: 10.1029/2011JC007004

      Key Points

      • Climate simulations of sea ice are compared with observations of sea ice
      • Difficulties in reproducing observed mean ice circulation and thickness
      • Comparisons suggest considerable uncertainties in the projected rates of sea ice
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      An unstructured-grid, finite-volume sea ice model: Development, validation, and application

      Guoping Gao, Changsheng Chen, Jianhua Qi and Robert C. Beardsley

      Version of Record online: 17 SEP 2011 | DOI: 10.1029/2010JC006688

      Key Points

      • An unstructured-grid CICE has been developed and validated
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      Surface freshening in the Arctic Ocean's Eurasian Basin: An apparent consequence of recent change in the wind-driven circulation

      M.-L. Timmermans, A. Proshutinsky, R. A. Krishfield, D. K. Perovich, J. A. Richter-Menge, T. P. Stanton and J. M. Toole

      Version of Record online: 23 JUL 2011 | DOI: 10.1029/2011JC006975

      Key Points

      • Eurasian Basin upper ocean was appreciably fresher in 2010 than in 2007–2008
      • Change in salinity due to local melt cannot account for the anomaly
      • Observed fresh water attributed to a 2009 shift in the atmospheric circulation
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      Arctic ice-ocean simulation with optimized model parameters: Approach and assessment

      An T. Nguyen, Dimitris Menemenlis and Ronald Kwok

      Version of Record online: 27 APR 2011 | DOI: 10.1029/2010JC006573

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