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Journal of Geophysical Research: Oceans (1978–2012)

Cover image for Journal of Geophysical Research: Oceans (1978–2012)

October 2012

Volume 117, Issue C10

Currently known as: Journal of Geophysical Research: Oceans

    1. You have free access to this content
      Improving sea level reconstructions using non-sea level measurements

      B. D. Hamlington, R. R. Leben and K.-Y. Kim

      Version of Record online: 31 OCT 2012 | DOI: 10.1029/2012JC008277

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      Key Points

      • Sea surface temperature is used to create an improved sea level reconstruction
      • The reconstruction is used for monitoring climate signals in the Pacific
      • Improvement is demonstrated in the first half of the 20th century
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      Retrieval of the spectral diffuse attenuation coefficient Kd(λ) in open and coastal ocean waters using a neural network inversion

      C. Jamet, H. Loisel and D. Dessailly

      Version of Record online: 27 OCT 2012 | DOI: 10.1029/2012JC008076

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      Key Points

      • Diffuse attenuation coefficient retrieval using neural network inversion
      • This new empirical inversion is suitable for open and coastal waters
      • It is wavelength and Sun-zenith angle independent
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      An evaluation of the barotropic and internal tides in a high-resolution global ocean circulation model

      J. F. Shriver, B. K. Arbic, J. G. Richman, R. D. Ray, E. J. Metzger, A. J. Wallcraft and P. G. Timko

      Version of Record online: 27 OCT 2012 | DOI: 10.1029/2012JC008170

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      Key Points

      • Model and observations show generation of internal tides in limited regions
      • Our global model is able to generate internal waves consistent with observations
      • Barotropic phase errors are a major source of errors in the model internal tide
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      Combination of gravimetric and altimetric space observations for estimating oceanic polar motion excitations

      F. Göttl, M. Schmidt, R. Heinkelmann, R. Savcenko and J. Bouman

      Version of Record online: 25 OCT 2012 | DOI: 10.1029/2012JC007915

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      Key Points

      • Oceanic mass effect determined from time variable gravity field solutions
      • Oceanic mass effect determined from sea level anomalies
      • Combination of gravimetric and altimetric solutions for the oceanic mass effect
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      Modeling seasonal to interannual ocean variability of coastal British Columbia

      Diane Masson and Isaac Fine

      Version of Record online: 24 OCT 2012 | DOI: 10.1029/2012JC008151

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      Key Points

      • ROMS implemented for the British Columbia coast
      • Model reproduces realistic seasonal to interannual ocean variability
      • Local response to 1997-1998 El Nino mostly forced at lateral boundaries
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      A conceptual framework for shear flow–induced erosion of soft cohesive sediment beds

      J. C. Winterwerp, W. G. M. van Kesteren, B. van Prooijen and W. Jacobs

      Version of Record online: 24 OCT 2012 | DOI: 10.1029/2012JC008072

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      Key Points

      • Erosion of cohesive sediment bed
      • Soil mechanical approach
      • Hydrodynamical approach
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      Mesoscale eddies in the northeastern Pacific tropical-subtropical transition zone: Statistical characterization from satellite altimetry

      J. A. Kurczyn, E. Beier, M. F. Lavín and A. Chaigneau

      Version of Record online: 24 OCT 2012 | DOI: 10.1029/2012JC007970

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      Key Points

      • Mesoscale eddy generation is more frequent near three coastal subregions
      • Subregions show differences in eddy properties and polarity preference
      • Eddy generation can be associated to offshore currents or the Upwelling Index
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      Using MODIS data to estimate sea ice thickness in the Bohai Sea (China) in the 2009–2010 winter

      Hua Su and Yunpeng Wang

      Version of Record online: 23 OCT 2012 | DOI: 10.1029/2012JC008251

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      Key Points

      • Propose a method to estimate sea ice thickness over a large area using MODIS data
      • Sea ice thickness evolution are monitored using multitemporal data in Bohai Bay
      • Sea ice thickness correlated to the theta(FDD-TDD)
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      Ocean temperature variability for the past 60 years on the Norwegian-Svalbard margin influences gas hydrate stability on human time scales

      Bénédicte Ferré, Jürgen Mienert and Tomas Feseker

      Version of Record online: 23 OCT 2012 | DOI: 10.1029/2012JC008300

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      Key Points

      • Increasing seabed temperatures makes gas hydrate unstable in shallow regions
      • Temperature increase in deep areas is not enough to destabilize gas hydrate
      • Bottom water temperature seems to be partly regulated by the NAO
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      The interannual variability of potential temperature in the central Labrador Sea

      Hao Luo, Annalisa Bracco, Igor Yashayaev and Emanuele Di Lorenzo

      Version of Record online: 19 OCT 2012 | DOI: 10.1029/2012JC007988

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      Key Points

      • Local atmospheric forcing drives the interannual signal of potential temperature
      • Boundary current contributes about half of warming trend during the last decade
      • Irminger water transported to central Labrador Sea decreases during last decade
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      Quantification of gas bubble emissions from submarine hydrocarbon seeps at the Makran continental margin (offshore Pakistan)

      Miriam Römer, Heiko Sahling, Thomas Pape, Gerhard Bohrmann and Volkhard Spieß

      Version of Record online: 18 OCT 2012 | DOI: 10.1029/2011JC007424

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      Key Points

      • Gas bubble emissions at the MCM occur in water depths between 575 and 2870 m
      • About 40+/- 32 x 10^6mol methane is emitted per year within the study area
      • Hydroacoustic observations show that all emitted CH4 remains within the ocean
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      Bathymetric controls on sediment transport in the Hudson River estuary: Lateral asymmetry and frontal trapping

      David K. Ralston, W. Rockwell Geyer and John C. Warner

      Version of Record online: 17 OCT 2012 | DOI: 10.1029/2012JC008124

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      Key Points

      • Along-estuary sediment flux is landward in the channel and seaward on the shoals
      • Sediment trapping occurs at multiple salinity fronts along the estuary
      • Pycnocline elevation relative to the shoals sets erosion/deposition patterns
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      Signatures of Indian Ocean Dipole and El Niño–Southern Oscillation events in sea level variations in the Bay of Bengal

      S. G. Aparna, J. P. McCreary, D. Shankar and P. N. Vinayachandran

      Version of Record online: 17 OCT 2012 | DOI: 10.1029/2012JC008055

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      Key Points

      • We identify the signatures of IOD and ENSO in sea level variability
      • Distinguish the signatures of IOD with signatures of ENSO
      • Identify the forcing mechanisms of the sea-level variability
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      Correction to “A global analysis of ENSO synchrony: The oceans' biological response to physical forcing”

      Monique Messié and Francisco P. Chavez

      Version of Record online: 13 OCT 2012 | DOI: 10.1029/2012JC008536

      This article corrects:
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      Simulating the 1998 spring bloom in Lake Michigan using a coupled physical-biological model

      Lin Luo, Jia Wang, David J. Schwab, Henry Vanderploeg, George Leshkevich, Xuezhi Bai, Haoguo Hu and Dongxiao Wang

      Version of Record online: 13 OCT 2012 | DOI: 10.1029/2012JC008216

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      Key Points

      • A new wind-wave mixing parameterization was implemented into FVCOM model
      • Physical and ecological process studies of the spring bloom in Lake Michigan
      • Interior source in tha lake for sustaining the donut-like bloom was discussed
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      Interocean exchanges and the spreading of Antarctic Intermediate Water south of Africa

      Emanuela Rusciano, Sabrina Speich and Michel Ollitrault

      Version of Record online: 12 OCT 2012 | DOI: 10.1029/2012JC008266

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      Key Points

      • We used Argo hydrographic profiles collected from 2004 to 2011
      • South of Africa we find the presence of 3 regional varieties of AAIW
      • Of these one AAIW variety is new
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      Modulation of equatorial turbulence by a tropical instability wave

      R. Inoue, R.-C. Lien and J. N. Moum

      Version of Record online: 11 OCT 2012 | DOI: 10.1029/2011JC007767

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      Key Points

      • Modulation of turbulent mixing by a tropical instability wave was observed
      • Turbulent mixing varied over four distinct phases of the TIW
      • Turbulent mixing was greater than observed previously in the equatorial Pacific
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      Comparison of mixing efficiency and vertical diffusivity models from temperature microstructure

      J. F. Dunckley, J. R. Koseff, J. V. Steinbuck, S. G. Monismith and A. Genin

      Version of Record online: 6 OCT 2012 | DOI: 10.1029/2012JC007967

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      Key Points

      • Mixing efficiency varies greatly throughout the water column
      • The mixing efficiency coefficient impacts calculations of eddy diffusivity
      • Vertical diffusivity models do not work very well in all conditions
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      Climate variability and phytoplankton composition in the Pacific Ocean

      Cecile S. Rousseaux and Watson W. Gregg

      Version of Record online: 4 OCT 2012 | DOI: 10.1029/2012JC008083

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      Key Points

      • Climate variability has different effects on phytoplankton in the Pacific basins
      • Climate variability impacts phytoplankton the most in the Equatorial Pacific
      • Equatorial Pacific showed radical shifts in phytoplankton composition with ENSO
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      Seasonal and regional characterization of horizontal stirring in the global ocean

      Ismael Hernández-Carrasco, Cristóbal López, Emilio Hernández-García and Antonio Turiel

      Version of Record online: 4 OCT 2012 | DOI: 10.1029/2012JC008222

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      Key Points

      • Global view and seasonal behavior of stirring distribution in the oceans
      • The main currents in the ocean can be classified in two activity classes
      • Two Lagrangian-Eulerian relations associated to different stirring regimes
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      Changing controls on oceanic radiocarbon: New insights on shallow-to-deep ocean exchange and anthropogenic CO2 uptake

      H. D. Graven, N. Gruber, R. Key, S. Khatiwala and X. Giraud

      Version of Record online: 4 OCT 2012 | DOI: 10.1029/2012JC008074

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      Key Points

      • Interior ocean processes are now the main influence on oceanic radiocarbon
      • Oceanic radiocarbon can now be used to evaluate ocean models at global scales
      • 14C data suggest the ocean CO2 sink is between 1.7 and 2.3 PgC/yr for 1990-2007
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      Residual currents over a uniform slope due to breaking of internal waves in a two-layer system

      Keisuke Nakayama, Tetsuya Shintani, Kazuki Kokubo, Taro Kakinuma, Yasuyuki Maruya, Katsuaki Komai and Tomonari Okada

      Version of Record online: 3 OCT 2012 | DOI: 10.1029/2012JC008155

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      Key Points

      • The influence of the type of internal wave on residual currents is clarified
      • The slope effect of internal wave breaking on residual current is revealed
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      The role of wind on the detachment of low salinity water in the Changjiang Estuary in summer

      Ji-Liang Xuan, Daji Huang, Feng Zhou, Xiao-Hua Zhu and Xiaopeng Fan

      Version of Record online: 3 OCT 2012 | DOI: 10.1029/2012JC008121

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      Key Points

      • Wind is the most important dynamic in the LSW detachments
      • A strong southeast wind is necessary for the formation of the LSW patch
      • The southwest wind plays a key role in the magnitude of the detachments
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      Circulation on the central Bering Sea shelf, July 2008 to July 2010

      S. Danielson, T. Weingartner, K. Aagaard, J. Zhang and R. Woodgate

      Version of Record online: 3 OCT 2012 | DOI: 10.1029/2012JC008303

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      Key Points

      • Wind-forced Ekman dynamics are primarily responsible for flow variations
      • Flows are highly variable, means small; low frequencies coherent over 200 km
      • Under northwesterly winds, nutrient-rich waters replace dilute coastal waters
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      East Pacific ocean eddies and their relationship to subseasonal variability in Central American wind jets

      Chueh-Hsin Chang, Shang-Ping Xie, Niklas Schneider, Bo Qiu, Justin Small, Wei Zhuang, Bunmei Taguchi, Hideharu Sasaki and Xiaopei Lin

      Version of Record online: 2 OCT 2012 | DOI: 10.1029/2011JC007315

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      Key Points

      • Central American gap wind forces ocean variability on subseasonal timescale
      • Propagation of eddy-like features consistent with local baroclinic Rossby waves
      • Subsequent growth of Central American eddy is helped by mean flow instability

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