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Journal of Geophysical Research: Oceans (1978–2012)

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

July 2012

Volume 117, Issue C7

Currently known as: Journal of Geophysical Research: Oceans

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      Water mass bio-optical properties in the Monterey Bay region: Fluorescence-based inference of shifts in phytoplankton photophysiology

      J. K. Jolliff, R. W. Gould Jr., B. Penta, W. J. Teague, S. DeRada, F. P. Chavez and R. A. Arnone

      Article first published online: 26 JUL 2012 | DOI: 10.1029/2011JC007568

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      Key Points

      • Phytoplankton fluorescence-FL properties are differentiable by water mass type
      • Apparent FL efficiency and saturation follow salinity gradients
      • Phytoplankton taxon-specific variation in photophysiology explains the data
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      Spreading of the Western Mediterranean Deep Water after winter 2005: Time scales and deep cyclone transport

      J. Beuvier, K. Béranger, C. Lebeaupin Brossier, S. Somot, F. Sevault, Y. Drillet, R. Bourdallé-Badie, N. Ferry and F. Lyard

      Article first published online: 26 JUL 2012 | DOI: 10.1029/2011JC007679

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      Key Points

      • Process study with an eddy-resolving model of the Mediterranean Sea
      • Modeling the intense deep convection of winter 2005 in the Gulf of Lions
      • Deep propagation of the new WMDW by cyclonic eddies
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      The Makassar Strait throughflow and its jet

      B. Mayer and P. E. Damm

      Article first published online: 26 JUL 2012 | DOI: 10.1029/2011JC007809

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      Key Points

      • The Makassar Strait throughflow is part of a distinct current: Makassar Current
      • The Makassar Current behaves for its entire way like a western boundary current
      • The wind plays two counteracting roles for the Makassar Strait flow and the ITF
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      Abnormal upwelling and chlorophyll-a concentration off South Vietnam in summer 2007

      Xin Liu, Jing Wang, Xuhua Cheng and Yan Du

      Article first published online: 26 JUL 2012 | DOI: 10.1029/2012JC008052

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      Key Points

      • IOD with La Nina enhances southwesterly summer monsoon over the SCS in 2007
      • The MJO event in August is the major cause of the upwelling and Chl-a bloom
      • Unlike other El Nino events, 2006-2007 El Nino does not play a role as expected
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      Nearshore internal bores and turbulent mixing in southern Monterey Bay

      Ryan K. Walter, C. Brock Woodson, Robert S. Arthur, Oliver B. Fringer and Stephen G. Monismith

      Article first published online: 25 JUL 2012 | DOI: 10.1029/2012JC008115

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      Key Points

      • Transient mixing and stratification events associated with internal bores
      • Local shear-produced TKE by bores dominates mixing in stratified interior
      • Bores represent dominate source of variability in the nearshore environment
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      Hypoxia in the Lower St. Lawrence Estuary: How physics controls spatial patterns

      S. Lefort, Y. Gratton, A. Mucci, I. Dadou and D. Gilbert

      Article first published online: 25 JUL 2012 | DOI: 10.1029/2011JC007751

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      Key Points

      • Reproduce observed geographical distribution of dissolved oxygen concentration
      • System much more sensitive to physical than biogeochemical processes
      • Circulation within the Channel mostly responsible for hypoxia in the LSLE
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      Mapping ocean outfall plumes and their mixing using autonomous underwater vehicles

      Peter Rogowski, Eric Terrill, Mark Otero, Lisa Hazard and William Middleton

      Article first published online: 20 JUL 2012 | DOI: 10.1029/2011JC007804

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      Key Points

      • 100% detection rate of an ocean outfall discharge using the natural tracer CDOM
      • High resolution AUV observations allowed for detailed analysis of plume mixing
      • The plume rise height and dilution can be impacted by internal waves
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      The forcing mechanism leading to the Kuroshio intrusion into the South China Sea

      Chau-Ron Wu and Yi-Chia Hsin

      Article first published online: 19 JUL 2012 | DOI: 10.1029/2012JC007968

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      Key Points

      • Importance of wind inside the SCS is superior to that outside the SCS
      • Ekman drift intensifies the upstream Kuroshio, enhancing the intrusion
      • Wind stress curl off southwest Taiwan is chiefly responsible for the intrusion
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      An intensification trend of South Pacific Mode Water subduction rates over the 20th century

      Chengyan Liu and Lixin Wu

      Article first published online: 18 JUL 2012 | DOI: 10.1029/2011JC007755

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      Key Points

      • Subduction of mode water is intensified in the South Pacific
      • Subtropical mode waters are intensified by the vertical pumping
      • Subduction in the ACC region is intensified by the lateral induction
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      Orbital velocity and breaking in steep random gravity waves

      John Grue and Atle Jensen

      Article first published online: 18 JUL 2012 | DOI: 10.1029/2012JC008024

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      Key Points

      • Local wave slope and phase speed interpret kinematics of steep irregular waves
      • Laboratory waves exhibit breaking for wave slope of 0.3
      • Calculation of kinematics in GOTEX waves shows similarities with laboratory waves
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      A year of internal Poincaré waves in southern Lake Michigan

      Jun Choi, Cary D. Troy, Tsung-Chan Hsieh, Nathan Hawley and Michael J. McCormick

      Article first published online: 18 JUL 2012 | DOI: 10.1029/2012JC007984

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      Key Points

      • Near-inertial waves dominate summer offshore currents in Lake Michigan
      • A simple slab model re-creates the seasonal variation of near-inertial energy
      • The cross-thermocline shear from near-inertial waves can be generate mixing
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      The effect of surface heat fluxes on interannual variability in the spring onset of snow melt in the central Arctic Ocean

      Elena Maksimovich and Timo Vihma

      Article first published online: 14 JUL 2012 | DOI: 10.1029/2011JC007220

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      Key Points

      • ERA Interim surface fluxes explain interannual variability in snowmelt onset
      • SSM/I MO is a blend of snow MO on top of compact sea ice and divergent ice drift
      • Trends in surface fluxes cannot explain MO and SMO trends
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      Vertical heat transfer in the Arctic Ocean: The role of double-diffusive mixing

      Anders Sirevaag and Ilker Fer

      Article first published online: 13 JUL 2012 | DOI: 10.1029/2012JC007910

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      Key Points

      • Detection of thermohaline staircase structure in Amundsen Basin
      • Quantification of vertical heat transfer by diffusive convection
      • Evaluation of diffusive convection parameterization
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      Quantitative analysis of the influence of dust sea surface forcing on the primary production of the subtropical Atlantic Ocean using a ten-year time series of satellite observations

      Malik Chami, Marc Mallet and Bernard Gentili

      Article first published online: 13 JUL 2012 | DOI: 10.1029/2012JC008112

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      Key Points

      • The attenuation of the PAR due to the occurrence of dust is about 15%
      • Dust sea surface forcing could induce a decrease of primary production up to 35%
      • Tendency of decrease of primary production of 22% per 100 years in summer
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      Seasonal sea level cycle in the Caribbean Sea

      R. Ricardo Torres and Michael N. Tsimplis

      Article first published online: 13 JUL 2012 | DOI: 10.1029/2012JC008159

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      Key Points

      • Temporal and spatial variability of Caribbean seasonal sea level cycle analysed
      • Dominant forcing parameters for seasonality and its changes are identified
      • Seasonality in steric effects, winds and river runoff are important in sub-regions
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      Observational study of relationships between incoming radiation, open water fraction, and ocean-to-ice heat flux in the Transpolar Drift: 2002–2010

      Timothy P. Stanton, William J. Shaw and Jennifer K. Hutchings

      Article first published online: 10 JUL 2012 | DOI: 10.1029/2011JC007871

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      Key Points

      • Heat for melting tranpolar drift ice is controlled by open ocean fraction
      • This open ocean fration dominates lateral ice melting
      • Ice albedo positive feedbacks are not yet active in the transpolar drift
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      On the existence of stable seasonally varying Arctic sea ice in simple models

      W. Moon and J. S. Wettlaufer

      Article first published online: 10 JUL 2012 | DOI: 10.1029/2012JC008006

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      Key Points

      • Address the nature of transitions in the ice cover
      • Demonstrate the origin of stable/unstable seasonal ice
      • Address how this influences interpretations of transitions commonly discussed
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      Human induced turbidity changes in Poyang Lake between 2000 and 2010: Observations from MODIS

      Lian Feng, Chuanmin Hu, Xiaoling Chen, Liqiao Tian and Liqiong Chen

      Article first published online: 10 JUL 2012 | DOI: 10.1029/2011JC007864

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      Key Points

      • Robust retrieval algorithm of TSS in Poyang Lake
      • Long-term TSS distribution maps derived from MODIS data
      • The inter-annual variations were primarily driven by sand dredging activities
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      Phytoplankton blooms detected by SeaWiFS along the central and southern California coast

      Nikolay P. Nezlin, Martha A. Sutula, Richard P. Stumpf and Ashmita Sengupta

      Article first published online: 7 JUL 2012 | DOI: 10.1029/2011JC007773

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      Key Points

      • Offshore chlorophyll extension is an adequate measure of phytoplankton blooms
      • Upwelling is a major factor driving phytoplankton blooms off California
      • Influence of stormwater discharge is limited to river mouths
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      Mesoscale variability in the northeastern tropical Pacific: Forcing mechanisms and eddy properties

      Jun-Hong Liang, James C. McWilliams, Jaison Kurian, François Colas, Peng Wang and Yusuke Uchiyama

      Article first published online: 7 JUL 2012 | DOI: 10.1029/2012JC008008

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      Key Points

      • Low-frequency wind and boundary forcing is the primary eddy forcing mechanism
      • High-frequency wind and equatorial Kelvin wave play an additional role
      • The fragility of large-amplitude cyclones is important for anticyclone dominance
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      On the dynamics of current jets trapped to the flanks of mid-ocean ridges

      J. W. Lavelle

      Article first published online: 6 JUL 2012 | DOI: 10.1029/2011JC007627

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      Key Points

      • Mean current jets are trapped to the flanks of spreading center ridges
      • Jets are an example of stratified topographic rectification
      • Jet character primarily determined by very long-period, sub-inertial oscillations
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      An assessment of two different satellite-derived precipitation products in relation to simulation of sea surface salinity in the tropical Indian Ocean

      Rashmi Sharma, Bhasha Mankad, Neeraj Agarwal, Raj Kumar and Sujit Basu

      Article first published online: 3 JUL 2012 | DOI: 10.1029/2012JC008078

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      Key Points

      • Impact of satellite precipitation on model SSS studied
      • Low-salinity tongue during dipole is well simulated
      • Role of ocean dynamics during dipole studied
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      Introduction to special section on Recent Advances in the Study of Optical Variability in the Near-Surface and Upper Ocean

      T. Dickey, M. L. Banner, P. Bhandari, T. Boyd, L. Carvalho, G. Chang, Y. Chao, H. Czerski, M. Darecki, C. Dong, D. Farmer, S. Freeman, J. Gemmrich, P. Gernez, N. Hall-Patch, B. Holt, S. Jiang, C. Jones, G. Kattawar, D. LeBel, L. Lenain, M. Lewis, Y. Liu, L. Logan, D. Manov, W. K. Melville, M. A. Moline, R. Morison, F. Nencioli, W. S. Pegau, B. Reineman, I. Robbins, R. Röttgers, H. Schultz, L. Shen, M. Shinki, M. Slivkoff, M. Sokólski, F. Spada, N. Statom, D. Stramski, P. Sutherland, M. Twardowski, S. Vagle, R. Van Dommelen, K. Voss, L. Washburn, J. Wei, H. Wijesekera, O. Wurl, D. Yang, S. Yildiz, Y. You, D. K. P. Yue, R. Zaneveld and C. J. Zappa

      Article first published online: 30 JUN 2012 | DOI: 10.1029/2012JC007964

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      Key Points

      • Optical variability ocean on very short time and space scales
      • Factors affecting optical properties and propagation of light in the ocean
      • New research and increased understanding of light propagation at small scale
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      An overview of sea state conditions and air-sea fluxes during RaDyO

      Christopher J. Zappa, Michael L. Banner, Howard Schultz, Johannes R. Gemmrich, Russel P. Morison, Deborah A. LeBel and Tommy Dickey

      Article first published online: 5 MAY 2012 | DOI: 10.1029/2011JC007336

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      Key Points

      • First high-resolution measurements of short ocean waves by imaging polarimetry
      • Ocean currents play a strong role in influencing mean squared wave slope
      • Breaking crest length spectral densities attenuate at small scales
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      Radiative transfer in ocean turbulence and its effect on underwater light field

      Zao Xu, Xin Guo, Lian Shen and Dick K. P. Yue

      Article first published online: 22 MAR 2012 | DOI: 10.1029/2011JC007351

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      Key Points

      • Simulate three-dimensional natural light radiative transfer in ocean turbulence
      • Numerically obtain free surface turbulence and transport of passive scalars
      • Study ocean turbulence effects on in-water natural light field properties
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      The optical volume scattering function in a surf zone inverted to derive sediment and bubble particle subpopulations

      Michael Twardowski, Xiaodong Zhang, Svein Vagle, James Sullivan, Scott Freeman, Helen Czerski, Yu You, Lei Bi and George Kattawar

      Article first published online: 21 FEB 2012 | DOI: 10.1029/2011JC007347

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      Key Points

      • Volume scattering functions are highly dynamic in the surf zone
      • VSF variability is due to changes in the composition/magnitude of particles
      • Optically relevant particle fields consist of sediments and bubbles
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      Reduced upper ocean turbulence and changes to bubble size distributions during large downward heat flux events

      Svein Vagle, Johannes Gemmrich and Helen Czerski

      Article first published online: 9 FEB 2012 | DOI: 10.1029/2011JC007308

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      Key Points

      • Strong downward heat flux affects near-surface turbulence
      • Modified turbulence affects the upper ocean bubble distribution
      • Changes in near-surface bubbles affect near-optical properties
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      Evaluation of bio-optical inversion of spectral irradiance measured from an autonomous underwater vehicle

      Mark A. Moline, Ian Robbins, Brian Zelenke, W. Scott Pegau and Hemantha Wijesekera

      Article first published online: 31 JAN 2012 | DOI: 10.1029/2011JC007352

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      Key Points

      • Application of a bio-optical inversion technique in two optically different sites
      • Evaluation of effects of surface conditions of light distribution
      • Conclusions about application of bio-optical inversion technique
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      Three-dimensional oceanic eddy analysis in the Southern California Bight from a numerical product

      Changming Dong, Xiayan Lin, Yu Liu, Francesco Nencioli, Yi Chao, Yuping Guan, Dake Chen, Tommy Dickey and James C. McWilliams

      Article first published online: 7 JAN 2012 | DOI: 10.1029/2011JC007354

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      Key Points

      • Three-dimensional eddy analysis
      • High-resolution numerical product
      • Island and headland wakes

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