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Combined list of the recent articles of the journal Ocean Science and the recent discussion forum Ocean Science Discussions



 



Simulations and observation of nonlinear internal waves on the continental shelf: Korteweg–de Vries and extended Korteweg–de Vries solutions

Thu, 21 Sep 2017 00:41:34 +0200

Simulations and observation of nonlinear internal waves on the continental shelf: Korteweg–de Vries and extended Korteweg–de Vries solutions
Kieran O'Driscoll and Murray Levine
Ocean Sci., 13, 749-763, https://doi.org/10.5194/os-13-749-2017, 2017
Studies of the propagation and evolution of the internal tide and development of non-linear internal waves as they cross the continental shelf are presented. Model simulations are based on wave theory, and the results are analyzed and compared with observations during the Coastal Mixing and Optics experiment. These waves are important: they transport momentum and energy, provide energy for vertical mixing, carry nutrients onto the continental shelf and resuspend and moving sediment.



Response to Filchner–Ronne Ice Shelf cavity warming in a coupled ocean–ice sheet model – Part 1: The ocean perspective

Thu, 21 Sep 2017 00:41:34 +0200

Response to Filchner–Ronne Ice Shelf cavity warming in a coupled ocean–ice sheet model – Part 1: The ocean perspective
Ralph Timmermann and Sebastian Goeller
Ocean Sci., 13, 765-776, https://doi.org/10.5194/os-13-765-2017, 2017
A coupled model has been developed to study the interaction between the ocean and the Antarctic ice sheet. Simulations for present-day climate yield realistic ice-shelf melt rates and a grounding line position close to the observed state. In a warm-water-inflow scenario, the model suggests a substantial thinning of the ice shelf and a local retreat of the grounding line. The coupled model yields a stronger increase in ice-shelf basal melt rates than a fixed-geometry control experiment.



Medium-term dynamics of a middle Adriatic barred beach

Mon, 18 Sep 2017 00:41:34 +0200

Medium-term dynamics of a middle Adriatic barred beach
Matteo Postacchini, Luciano Soldini, Carlo Lorenzoni, and Alessandro Mancinelli
Ocean Sci., 13, 719-734, https://doi.org/10.5194/os-13-719-2017, 2017
Sandy beaches are a common landscape feature of the Italian Adriatic coast. From an economic and touristic point of view, the unprotected beach of Senigallia is an important area, frequently monitored in the last decades. The annual evolution of the submerged bars can be related to the climate: waves from the NNE/ESE, characterized by larger/smaller steepness and relative height, induce seaward/shoreward bar migration and bar smoothing/steepening.



Carbon geochemistry of plankton-dominated samples in the Laptev and East Siberian shelves: contrasts in suspended particle composition

Mon, 18 Sep 2017 00:41:34 +0200

Carbon geochemistry of plankton-dominated samples in the Laptev and East Siberian shelves: contrasts in suspended particle composition
Tommaso Tesi, Marc C. Geibel, Christof Pearce, Elena Panova, Jorien E. Vonk, Emma Karlsson, Joan A. Salvado, Martin Kruså, Lisa Bröder, Christoph Humborg, Igor Semiletov, and Örjan Gustafsson
Ocean Sci., 13, 735-748, https://doi.org/10.5194/os-13-735-2017, 2017
Recent Arctic studies suggest that sea-ice decline and permafrost thawing will affect the phytoplankton in the Arctic Ocean. However, in what way the plankton composition will change as the warming proceeds remains elusive. Here we show that the carbon composition of plankton might change as a function of the enhanced terrestrial organic carbon supply and progressive sea-ice thawing.



Observation of dominance of swells over wind seas in the coastal waters of the Gulf of Mannar, India

Fri, 15 Sep 2017 00:41:34 +0200

Observation of dominance of swells over wind seas in the coastal waters of the Gulf of Mannar, India
M. M. Amrutha and V. Sanil Kumar
Ocean Sci., 13, 703-717, https://doi.org/10.5194/os-13-703-2017, 2017
Waves measured at 12 m in the near-shore waters of the Gulf of Mannar for a 1-year period are used to examine the predominance of wind seas and swells through spectral characterization. The waves of the study region are under the control of sea breeze, with the maximum in the late evening and the minimum in the early morning. A total of 53 % of the surface height variance in the study area results from swells from the southeast and south; the remainder are wind seas from the east and southeast.



Recurrence intervals for the closure of the Dutch Maeslant surge barrier

Thu, 14 Sep 2017 00:41:34 +0200

Recurrence intervals for the closure of the Dutch Maeslant surge barrier
Henk W. van den Brink and Sacha de Goederen
Ocean Sci., 13, 691-701, https://doi.org/10.5194/os-13-691-2017, 2017
The movable Dutch Maeslant surge barrier closes when the city of Rotterdam is threatened by floods due to a big storm on the North Sea. However, the barrier might get damaged and repair may be needed. The question is what is the probability that a second closure is necessary during the repair time? We solve the problem by using a huge dataset of weather situations that accumulates to more than 6000 years. It is found that two closures within a month occur on average once in every 150 years.



Modelling of sediment transport and morphological evolution under the combined action of waves and currents

Thu, 07 Sep 2017 00:41:34 +0200

Modelling of sediment transport and morphological evolution under the combined action of waves and currents
Guilherme Franz, Matthias T. Delpey, David Brito, Lígia Pinto, Paulo Leitão, and Ramiro Neves
Ocean Sci., 13, 673-690, https://doi.org/10.5194/os-13-673-2017, 2017
The paper describes a numerical modelling methodology capable of reproducing the hydrodynamics, sediment transport, and morphological evolution of coastal zones under the combined action of waves and currents. The long-term beach response to different designs of coastal defence structures was assessed, as well as the formation of multiple sandbars on the beach slope. The methodology can be applied in engineering studies in order to evaluate the best solution to protect the coast against erosion.



Uncertainties in shoreline position analysis: the role of run-up and tide in a gentle slope beach

Thu, 07 Sep 2017 00:41:34 +0200

Uncertainties in shoreline position analysis: the role of run-up and tide in a gentle slope beach
Giorgio Manno, Carlo Lo Re, and Giuseppe Ciraolo
Ocean Sci., 13, 661-671, https://doi.org/10.5194/os-13-661-2017, 2017
Beach evolution analysis can be conducted using GIS methodologies, such as the well-known Digital Shoreline Analysis System (DSAS), in which error assessment based on shoreline positioning plays a significant role. In this study, a new approach is proposed to estimate the positioning errors due to tide and wave run-up influence.



Decorrelation scales for Arctic Ocean Hydrography. Part I: Amerasian Basin

Wed, 06 Sep 2017 00:41:34 +0200

Decorrelation scales for Arctic Ocean Hydrography. Part I: Amerasian Basin
Hiroshi Sumata, Frank Kauker, Michael Karcher, Benjamin Rabe, Mary-Louise Timmermans, Axel Behrendt, Rüdiger Gerdes, Ursula Schauer, Koji Shimada, Kyoung-Ho Cho, and Takashi Kikuchi
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-70,2017
Manuscript under review for OS (discussion: open, 0 comments)
We estimated spatial and temporal decorrelation scales of temperature and salinity in the Amerasian Basin in the Arctic Ocean. The estimated scales can be applied to representation error assessment in the ocean data assimilation system for the Arctic Ocean.



High-resolution diapycnal mixing map of the Alboran Sea thermocline from seismic reflection images

Tue, 05 Sep 2017 00:41:34 +0200

High-resolution diapycnal mixing map of the Alboran Sea thermocline from seismic reflection images
Jhon F. Mojica, Valentí Sallares, and Berta Biescas
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-72,2017
Manuscript under review for OS (discussion: open, 0 comments)
The Alboran Sea is a dynamically active region. The interaction between Mediterranean and Atlantic water originates a set of sub-mesoscale structures and a complex sequence of processes that entail mixing close to the thermocline. Here we present a high-resolution map of the diapycnal diffusivity around the thermocline depth obtained using acoustic data recorded with a high-resolution multichannel seismic system. The map revels a patchy thermocline, with areas of strong diapycnal mixing.



Effect of winds and waves on salt intrusion in the Pearl River Estuary

Tue, 05 Sep 2017 00:41:34 +0200

Effect of winds and waves on salt intrusion in the Pearl River Estuary
Wenping Gong, Zhongyuan Lin, Yunzhen Chen, Zhaoyun Chen, and Heng Zhang
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-73,2017
Manuscript under review for OS (discussion: open, 0 comments)
Salt intrusion in the Pearl River Estuary (PRE) is a dynamic process that is influenced by a range of factors and to date, few studies have examined the effects of winds and waves on salt intrusion in the PRE. We investigate these effects using the Coupled-Ocean-Atmosphere-Wave-Sediment Transport (COAWST) modeling system applied to the PRE. After careful validation, the model is used for a series of diagnostic simulations. It is revealed that the local wind considerably strengthens the salt intrusion by lowering the water level in the eastern part of the estuary and increasing the bottom landward flow. The remote wind increases the water mixing on the continental shelf, elevates the water level on the shelf and in the PRE, and pumps saltier shelf water into the estuary by Ekman transport. Enhancement of the salt intrusion is comparable between the remote and local winds. Waves decrease the salt intrusion by increasing the water mixing. Sensitivity analysis shows that the axial down-estuary wind, is most efficient in driving increases in salt intrusion via wind straining effect.



The density–salinity relation of standard seawater

Tue, 05 Sep 2017 00:41:34 +0200

The density–salinity relation of standard seawater
Hannes Schmidt, Steffen Seitz, Egon Hassel, and Henning Wolf
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-71,2017
Manuscript under review for OS (discussion: open, 3 comments)
A density–salinity relation for standard seawater was developed based on highly accurate density measurements. The relation makes it possible to determine salinity by density measurement at a level of accuracy that is comparable to that achieved by conductivity measurement. The relation may be used to verify the constant composition of standard seawater by means of routine density measurements.



A measurement system for vertical seawater profiles close to the air–sea interface

Mon, 04 Sep 2017 00:41:34 +0200

A measurement system for vertical seawater profiles close to the air–sea interface
Richard P. Sims, Ute Schuster, Andrew J. Watson, Ming Xi Yang, Frances E. Hopkins, John Stephens, and Thomas G. Bell
Ocean Sci., 13, 649-660, https://doi.org/10.5194/os-13-649-2017, 2017
This paper describes a near-surface ocean profiler (NSOP) that is deployed from a research vessel. The NSOP is used to sample the top 10 m of the ocean and pumps water back to the research ship for scientific analyses such as for trace gases. The precision in the depth of the seawater collection improves upon previous methods. The NSOP has been used to observe vertical gradients in the upper 5 m for temperature, carbon dioxide and dimethylsulfide.



Importance of vertical mixing and barrier layer variation on seasonal mixed layer heat balance in the Bay of Bengal

Mon, 04 Sep 2017 00:41:34 +0200

Importance of vertical mixing and barrier layer variation on seasonal mixed layer heat balance in the Bay of Bengal
Ullala Pathiranage Gayan Pathirana, Gengxin Chen, Tilak Priyadarshana, and Dongxiao Wang
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-67,2017
Manuscript under review for OS (discussion: open, 0 comments)
Seasonal changes of the mixed layer heat storage in the BoB significantly contribute to the regional weather and climate by inducing air-sea interactions. Seasonality associated with vertical mixing and barrier layer indicates the seasonal response from the ocean in the BoB. This study will provide a significant contribution to further studies on air-sea interactions in the BoB, especially the role of vertical mixing and barrier layer variation during cyclone formation and intensification.



Study on organic matter fractions in the surface microlayer in the Baltic Sea by spectrophotometric and spectrofluorometric methods

Thu, 31 Aug 2017 00:41:34 +0200

Study on organic matter fractions in the surface microlayer in the Baltic Sea by spectrophotometric and spectrofluorometric methods
Violetta Drozdowska, Iwona Wrobel, Piotr Markuszewski, Przemysław Makuch, Anna Raczkowska, and Piotr Kowalczuk
Ocean Sci., 13, 633-647, https://doi.org/10.5194/os-13-633-2017, 2017
The studies on the absorption and fluorescence properties of the organic molecules included in surface microlayer (SML) and subsurface (SS) waters confirm that (i) the process of the structural changes in molecules of HMW to LMW, due to effects of photo- and biodegradation, occurs faster in the SML than in the SS; (ii) the organic molecules contained in the SML have a smaller molecular mass than in the SS. Hence, SML can specifically modify the physical processes associated with the sea surface.



Short Commentary on Marine Productivity at Arctic Shelf Breaks: Upwelling, Advection and Vertical Mixing

Wed, 30 Aug 2017 00:41:34 +0200

Short Commentary on Marine Productivity at Arctic Shelf Breaks: Upwelling, Advection and Vertical Mixing
Achim Randelhoff and Arild Sundfjord
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-68,2017
Manuscript under review for OS (discussion: open, 0 comments)
The future of Arctic marine ecosystems has received increasing attention in recent years as the extent of the sea ice cover is dwindling. Regional differences in the hydrography, bathymetry and atmospheric forcing of nutrient fluxes essential for phytoplankton growth mean that wind-driven mixing, advection and upwelling will influence the polar ecosystem in differing magnitudes in different regions of the Arctic Ocean, with particular effects likely being restricted to specific areas.



Determination of dissolved nitric oxide in coastal waters of the Yellow Sea off Qingdao

Tue, 29 Aug 2017 00:41:34 +0200

Determination of dissolved nitric oxide in coastal waters of the Yellow Sea off Qingdao
Chun-Ying Liu, Wei-Hua Feng, Ye Tian, Gui-Peng Yang, Pei-Feng Li, and Hermann W. Bange
Ocean Sci., 13, 623-632, https://doi.org/10.5194/os-13-623-2017, 2017
We developed a new method for the determination of dissolved nitric oxide (NO) in discrete seawater samples based on the combination of a purge-and-trap setup and a fluorometric detection of NO. With this method we have a reliable and comparably easy to use method to measure oceanic NO surface concentrations, which can be used to decipher both its temporal and spatial distributions as well as its biogeochemical pathways in the oceans.



South Atlantic meridional transports from NEMO-based simulations and reanalyses

Tue, 29 Aug 2017 00:41:34 +0200

South Atlantic meridional transports from NEMO-based simulations and reanalyses
Davi Mignac, David Ferreira, and Keith Haines
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-69,2017
Manuscript under review for OS (discussion: open, 0 comments)
Four ocean reanalyses and two free-running models are compared to study the meridional transports in the South Atlantic. We analyse the underlying causes of the product differences in an attempt to understand the potential impact (and limitations) of the data assimilation (DA) in improving the simulated ocean states. The DA schemes can consistently constrain the basin interior transports, but not the overturning circulation dominated by the narrow South Atlantic western boundary currents.



Isoneutral control of effective diapycnal mixing in numerical ocean models with neutral rotated diffusion tensors

Mon, 28 Aug 2017 00:41:34 +0200

Isoneutral control of effective diapycnal mixing in numerical ocean models with neutral rotated diffusion tensors
Antoine Hochet, Rémi Tailleux, David Ferreira, and Till Kuhlbrodt
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-62,2017
Manuscript under review for OS (discussion: open, 1 comment)
The current view about the mixing of heat and salt in the ocean is that it should be parameterised by means of a rotated diffusion tensor based on mixing directions parallel and perpendicular to the local neutral vector. However, the impossibility to construct a density variable in the ocean that is exactly neutral because of the coupling between thermobaricity and density-compensated temperature/salinity anomalies implies that the effective diapycnal diffusivity experienced by any possible density variable is partly controlled by isoneutral diffusion when using neutral rotated diffusion. Here, this effect is quantified by evaluating the effective diapycnal diffusion coefficient for five widely used density variables: Jackett and McDougall (1997) γn, Lorenz reference state density ρref of Winters and D’Asaro (1996); Saenz et al. (2015), and three potential density variables σ0, σ2 and σ4. Computations use the World Ocean Circulation Experiment climatology, assuming either a uniform value for isoneutral mixing or spatially varying values inferred from an inverse calculation. Isopycnal mixing contributions to the effective diapycnal mixing yields values systematically larger than 10−3 m2/s in the deep ocean for all density variables, with γn suffering the least from the isoneutral control of effective diapycnal mixing, and σ0 the most. These high values are due to spatially localised large values of non-neutrality, mostly in the deep Southern Ocean. Removing only 5 % of these high values on each density surface reduces the effective diapycnal diffusivities to less than 10−4 m2/s. This work highlights the potential pitfalls of estimating diapycnal diffusivities by means of Walin-like water masses analysis or in using Lorenz reference state for diagnosing spurious numerical diapycnal mixing.



Response of O2 and pH to ENSO in the California Current System in a high resolution global climate model

Thu, 17 Aug 2017 00:41:34 +0200

Response of O2 and pH to ENSO in the California Current System in a high resolution global climate model
Giuliana Turi, Michael Alexander, Nicole S. Lovenduski, Antonietta Capotondi, James Scott, Charles Stock, John Dunne, Jasmin John, and Michael Jacox
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-66,2017
Manuscript under review for OS (discussion: open, 1 comment)
A high-resolution global model was used to study the influence of El Niño/La Niña events on the California Current System (CalCS). The mean surface oxygen (O2) response extends well offshore, where the pH response occurs within ~100 km of the coast. The surface O2 (pH) is primarily driven by temperature (upwelling) changes. Below 100 m, anomalously low O2 and low pH occurred during La Niña events near the coast, potentially stressing the ecosystem, but there are large variations between events.