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



 



Spatial variations in zooplankton community structure along the Japanese coastline in the Japan Sea: influence of the coastal current

Tue, 21 Nov 2017 12:59:11 +0100

Spatial variations in zooplankton community structure along the Japanese coastline in the Japan Sea: influence of the coastal current
Taketoshi Kodama, Taku Wagawa, Naoki Iguchi, Yoshitake Takada, Takashi Takahashi, Ken-Ichi Fukudome, Haruyuki Morimoto, and Tsuneo Goto
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-91,2017
Manuscript under review for OS (discussion: open, 0 comments)
We examined the zooplankton community structure along the Japanese coast of the Sea of Japan. Zooplankton samples were collected during 15 cruises in spring from 1999 to 2013 by a plankton net, and zooplankton species were identified under s microscope. The zooplankton community changed with water temperature, and the submarine canyon structure caused the difference of water temperature in space.



Forecast skill score assessment of a relocatable ocean prediction system, using a simplified objective analysis method

Mon, 20 Nov 2017 12:59:11 +0100

Forecast skill score assessment of a relocatable ocean prediction system, using a simplified objective analysis method
Reiner Onken
Ocean Sci., 13, 925-945, https://doi.org/10.5194/os-13-925-2017, 2017
An ocean prediction model was driven by observations via assimilation. The best forecast was obtained using a smoothing scale of 12.5 km and a time window of 24 h for data selection. Mostly, the forecasts were better than that of a run without assimilation, the skill score increased with increasing forecast range, and the score for temperature was higher than the score for salinity. It is shown that a vast number of data can be managed by the applied method without data reduction.



Characteristics of high monsoon wind-waves observed at multiple stations in the eastern Arabian Sea

Thu, 16 Nov 2017 12:59:11 +0100

Characteristics of high monsoon wind-waves observed at multiple stations in the eastern Arabian Sea
M. M. Amrutha and V. Sanil Kumar
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-84,2017
Manuscript under review for OS (discussion: open, 0 comments)
Surface wind-waves properties during Indian summer monsoon is investigated based on measured data at 9-15 m water depth at 4 sites in nearshore waters of the eastern Arabian Sea. Significant wave height varied from 0.7 to 5.5 m with average ratio of crest height of wave to height of the same wave as 0.58 to 0.67. Extreme crest height is 1.23 to 1.35 times significant wave height. Measured waves were predominantly swell. Numerical wave model could estimate the wave height well during wave growth.



Meanders and eddy formation by a buoyant coastal current flowing over a sloping topography

Tue, 14 Nov 2017 12:59:11 +0100

Meanders and eddy formation by a buoyant coastal current flowing over a sloping topography
Laura Cimoli, Alexandre Stegner, and Guillaume Roullet
Ocean Sci., 13, 905-923, https://doi.org/10.5194/os-13-905-2017, 2017
The dispersion of coastal waters offshore strongly depends on the dynamical regime of the current that characterizes the local coastal circulation. By using an idealized model configuration, we identify some key parameters – which can be calculated from observations – that describe when a coastal current flowing over a sloping topography acts as a source of meanders or eddies or as a dynamical barrier to the cross-shore transport.



Hydrography and circulation west of Sardinia in June 2014

Mon, 13 Nov 2017 12:59:11 +0100

Hydrography and circulation west of Sardinia in June 2014
Michaela Knoll, Ines Borrione, Heinz-Volker Fiekas, Andreas Funk, Michael P. Hemming, Jan Kaiser, Reiner Onken, Bastien Queste, and Aniello Russo
Ocean Sci., 13, 889-904, https://doi.org/10.5194/os-13-889-2017, 2017
The hydrography and circulation west of Sardinia, observed in June 2014 during REP14-MED by means of various measuring platforms, are presented and compared with previous knowledge. So far, the circulation of this area is not well-known and the hydrography is subject to long-term changes. The different water masses are characterized and temporal changes are emphasized. The observed eddies are specified and geostrophic transports in the upper ocean are presented.



Atlantic water flow through the Faroese Channels

Mon, 13 Nov 2017 12:59:11 +0100

Atlantic water flow through the Faroese Channels
Bogi Hansen, Turið Poulsen, Karin Margretha Húsgarð Larsen, Hjálmar Hátún, Svein Østerhus, Elin Darelius, Barbara Berx, Detlef Quadfasel, and Kerstin Jochumsen
Ocean Sci., 13, 873-888, https://doi.org/10.5194/os-13-873-2017, 2017
On its way towards the Arctic, an important branch of warm Atlantic water passes through the Faroese Channels, but, in spite of more than a century of investigations, the detailed flow pattern through this channel system has not been resolved. This has strong implications for estimates of oceanic heat transport towards the Arctic. Here, we combine observations from various sources, which together paint a coherent picture of the Atlantic water flow and heat transport through this channel system.



Atlantic meridional overturning circulation at 14.5° N and 24.5° N during 1989/1992 and 2013/2015: volume, heat and freshwater fluxes

Thu, 09 Nov 2017 12:59:11 +0100

Atlantic meridional overturning circulation at 14.5° N and 24.5° N during 1989/1992 and 2013/2015: volume, heat and freshwater fluxes
Yao Fu, Johannes Karstensen, and Peter Brandt
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-87,2017
Manuscript under review for OS (discussion: open, 0 comments)
Analysis of hydrographic data in the Atlantic along 14.5° N and along 24.5° N shows that between the periods of 1989/92 and 2013/15, the Antarctic Intermediate Water became warmer and saltier at 14.5° N, and that the Antarctic Bottom Water became lighter at both latitudes. By applying a box inverse model, the Atlantic Meridional Overturning Circulation (AMOC) was determined. The AMOC was weaker during 2013/15 than during 1989/92 in the inverse solution, but likely due to the AMOC variability.



Estimation of extreme wave heights return period from short-term interpolation of multi-mission satellite data: application to the South Atlantic

Wed, 08 Nov 2017 12:59:11 +0100

Estimation of extreme wave heights return period from short-term interpolation of multi-mission satellite data: application to the South Atlantic
Julio Salcedo-Castro, Natália Pillar da Silva, Ricardo de Camargo, Eduardo Marone, and Héctor H. Sepúlveda
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-81,2017
Manuscript under review for OS (discussion: open, 0 comments)
This paper is focused on a new treatment to along-track satellite data so as to improve the processing of information related to the occurrence of extreme values. The main objective is to preserve information concerning to the occurrence of short-term extreme events (2–5 days) like cyclones. In this way, the representativenes of these events is enhanced when applying extreme value return analyses. This method allows us to improve our estimation of return period for risk analyses.



On deep convection events and Antarctic Bottom Water formation in ocean reanalysis products

Tue, 07 Nov 2017 12:59:11 +0100

On deep convection events and Antarctic Bottom Water formation in ocean reanalysis products
Wilton Aguiar, Mauricio M. Mata, and Rodrigo Kerr
Ocean Sci., 13, 851-872, https://doi.org/10.5194/os-13-851-2017, 2017
In ocean models, Antarctic Bottom Water (AABW) formation is frequently misrepresented. Hence, assessing the causes of spurious formation is important to ensure accurate future simulations. Only one of the state-of-art reanalyses investigated showed AABW formation accurately. Spurious formation in the other two products resulted from opening of open ocean polynyas. The relatively accurate AABW formation in one of the products is an important advance in the simulation of deep ocean circulation.



Forecasting experiments of a dynamical-statistical model of the sea surface temperature anomaly field based on the improved self-memorization principle

Tue, 07 Nov 2017 12:59:11 +0100

Forecasting experiments of a dynamical-statistical model of the sea surface temperature anomaly field based on the improved self-memorization principle
Mei Hong, Xi Chen, Ren Zhang, Dong Wang, Shuanghe Shen, and Vijay P. Singh
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-78,2017
Manuscript under review for OS (discussion: open, 0 comments)
With the objective of tackling the problem of inaccurate long-term ENSO forecasts, a new forecasting model of the SSTA field was proposed based on a dynamic system reconstruction idea and the principle of self-memorization. The improved model was used to forecast the SSTA field. The forecasted SSTA fields of three types of events are accurate. The improved model also has good forecasting results of the ENSO index. So our model has an advantage in ENSO prediction precision and length.



Shelf sea tidal currents and mixing fronts determined from ocean glider observations

Thu, 02 Nov 2017 12:59:11 +0100

Shelf sea tidal currents and mixing fronts determined from ocean glider observations
Peter M. F. Sheehan, Sarah L. Hughes, Barbara Berx, Alejandro Gallego, Rob A. Hall, Karen J. Heywood, and Bastien Y. Queste
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-88,2017
Manuscript under review for OS (discussion: open, 0 comments)
We calculate tidal velocities using observations of ocean currents collected by an underwater glider. We use these velocities to investigate the location of sharp boundaries between water masses in shallow seas. Narrow currents along these boundaries are important transport pathways around shallow seas for e.g. pollutants and organisms. Tides are an important control on boundary location in summer, but seawater's salt concentration can also influence boundary location, especially in winter.



Moored observations of mesoscale features in the Cape Basin: Characteristics and local impacts on water mass distributions

Wed, 01 Nov 2017 12:59:11 +0100

Moored observations of mesoscale features in the Cape Basin: Characteristics and local impacts on water mass distributions
Marion Kersalé, Tarron Lamont, Sabrina Speich, Thierry Terre, Remi Laxenaire, Mike J. Roberts, Marcel A. van den Berg, and Isabelle J. Ansorge
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-85,2017
Manuscript under review for OS (discussion: open, 0 comments)
The eastern side of the SAMBA array (South Atlantic Meridional overturning circulation Basin-wide Array) along the latitude 34.5° S is used to assess the nonlinear, mesoscale dynamics of the Cape Basin. This array presently consists of current meter moorings and CPIES (bottom mounted Inverted Echo Sounders with pressure sensor and current meter) deployed across the continental slope. These data, available from September 2014 to December 2015, combined with satellite altimetry allow us to investigate the characteristics and the impact of these mesoscale structures on local water masses distribution and cross-validate the different data sets. We demonstrate that the upper slope moorings are affected by cyclonic eddies generated at the South Benguela upwelling front, while the deeper slope moorings are affected by the more complex dynamics of the Cape Basin involving Agulhas Rings and cyclonic eddies. This complex dynamics induces strong intra-seasonal upper-ocean velocity variations and water masses exchanges across the shelf and the open ocean, but also across the subantarctic and subtropical waters. Under four case studies, the full-water column hydrographic properties of each mesoscale feature has been evaluated. Our analyses show that exchange of water masses happens through the advection of water by mesoscale eddies but also via wide water mass intrusions engendered by the existence of intense dipoles. The high spatial and temporal scales resolved by the moorings allows us to define the substantial role of these mesoscale features over the full-water column. Future investigations with longer time series at these existing sites will lead to a better understanding of the eastern boundary current variability, and ultimately improve our understanding of the strength and variability of the Meridional Overturning Circulation.



A modelling study of eddy-splitting by an island/seamount

Wed, 25 Oct 2017 12:59:11 +0200

A modelling study of eddy-splitting by an island/seamount
Shengmu Yang, Jiuxing Xing, Daoyi Chen, and Shengli Chen
Ocean Sci., 13, 837-849, https://doi.org/10.5194/os-13-837-2017, 2017
Motivated by eddy-splitting near Dongsha island, the eddy's trajectory and the effect of topography on eddy evolution were explored using the MITgcm. Warm eddies propagate to the southwest while cold eddies propagate to the northwest in open oceans. The results of the model indicate that the eddy would split in a qualitative range, and the location of the eddy split-off is related to the island size. In addition, eddy-splitting is an important way to transform energy between different scales.



Turbulence and hypoxia contribute to dense zooplankton scattering layers in Patagonian Fjord System

Tue, 24 Oct 2017 12:59:11 +0200

Turbulence and hypoxia contribute to dense zooplankton scattering layers in Patagonian Fjord System
Iván Pérez-Santos, Leonardo Castro, Nicolás Mayorga, Lauren Ross, Luis Cubillos, Mariano Gutierrez, Edwin Niklitschek, Eduardo Escalona, Nicolás Alegría, and Giovanni Daneri
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-89,2017
Manuscript under review for OS (discussion: open, 0 comments)
Fjord systems play an important role in primary production and carbon export. Acoustic, hydrographic and in-situ abundance measurements were used to study zooplankton assemblages at 44.7° S. Diel vertical migration of zooplankton stopped at the hypoxic boundary layer and apparently did not tolerate the hypoxia conditions. Turbulence appears to be the oceanographic process that contributes to the vertical mixing around sill, helping to the interchange of nutrient, feeding and carbon export.



Rising bubbles as mechanism for scavenging and aerosolization of diatoms

Tue, 24 Oct 2017 12:59:11 +0200

Rising bubbles as mechanism for scavenging and aerosolization of diatoms
Roman Marks, Ewa Górecka, Kevin Mc Cartney, and Wojciech Borkowski
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-82,2017
Manuscript under review for OS (discussion: open, 0 comments)
Experiments indicated that cation-mediated electrostriction plays a principal role in bubble vorticity and related attraction/scavenge of bacteria and diatoms by rising bubbles in saline water. The mechanism is important for global matter cycling and related process of matter accumulation near the ocean surface. Massive and long-term bubble-cationic-rotational processing of matter in the oceanic water and in droplets suspended in air may likely incepted the bio-matter evolution on the Earth.



In situ observations of infragravity wave directionality at nearshore coastal sites

Thu, 19 Oct 2017 12:59:11 +0200

In situ observations of infragravity wave directionality at nearshore coastal sites
Takehiko Nose, Alexander Babanin, and Kevin Ewans
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-77,2017
Manuscript under review for OS (discussion: open, 0 comments)
Using in situ measurements, we have obtained improved insights into infragravity (IG) wave heights' correlation with the wind waves, which are the forcing of IG waves. We have derived the qualitative directionality of IG wave field, also using in situ observations, and the qualitative physics were verified utilising an IG wave model. IG wave directionality has not had much attention in the past, but the results show that directional characteristics should be considered to study this wave.



A study on some basic features of inertial oscillations and near-inertial internal waves

Tue, 17 Oct 2017 12:59:11 +0200

A study on some basic features of inertial oscillations and near-inertial internal waves
Shengli Chen, Daoyi Chen, and Jiuxing Xing
Ocean Sci., 13, 829-836, https://doi.org/10.5194/os-13-829-2017, 2017
Simulations are used to examine the response of a shallow closed basin to a wind pulse. Features and differences of inertial oscillations and near-inertial internal waves are explored. The horizontal distribution of near-inertial energy is primarily controlled by the boundary effect on inertial oscillations, and the near-inertial internal wave makes a secondary effect. Near-inertial energy is reduced for cases with smaller water depths, due to energy transferred to seiches by barotropic waves.



The dynamics of İzmir Bay under the effects of wind and thermohaline forces

Mon, 16 Oct 2017 12:59:11 +0200

The dynamics of İzmir Bay under the effects of wind and thermohaline forces
Erdem Sayın and Canan Eronat
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-76,2017
Manuscript under review for OS (discussion: open, 1 comment)
The dominant circulation pattern of the İzmir Bay by the Aegean Sea coast of Turkey is studied under the influence of wind and thermohaline forces. İzmir Bay is discussed by subdividing the Bay into outer, middle and inner areas. Wind is the most important driven-force in İzmir coastal area. There are also thermohaline forces due to the existence of water types of different physical properties in the Bay. Instead of the two-layered current system prevailing during summer, a horizontally shared current system exists in winter. The free surface version of the Princeton model (Killworth's 3D general circulation model) is applied with the input data obtained through the measurements made by the research vessel K. Piri Reis. As a result of model experiments the basin-wide circulation in İzmir Bay is cyclonic. Although the stratification in the bay changes the behaviour of the circulation, the recirculation pattern does not change seasonally, but changes under the influence of wind forcing. Wind-driven circulation causes cyclonic or anti-cyclonic movements in the middle bay where the distinguished İzmir Bay Water (IBW) forms. Cyclonic movement takes place under the influence of southerly and westerly winds. On the other hand, northerly and easterly winds cause an anti-cyclonic movement in the Middle Bay. Outer and Inner Bay have also certain wind driven recirculation patterns.



Estimation of oceanic sub-surface mixing under a severe cyclonic storm using a coupled atmosphere-ocean-wave model

Tue, 10 Oct 2017 12:59:11 +0200

Estimation of oceanic sub-surface mixing under a severe cyclonic storm using a coupled atmosphere-ocean-wave model
Kumar Ravi Prakash, Tanuja Nigam, and Vimlesh Pant
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-83,2017
Manuscript under review for OS (discussion: open, 1 comment)
Parameters at the sea surface are determined by the air-sea fluxes of heat, salt, and momentum. Surface wind speed drives the oceanic surface circulation and mixing of temperature and salinity up to certain depth (mixed layer depth) from the sea surface. In this study, we examined oceanic mixing process using numerical models under strong cyclonic winds. Results highlight important role of inertial oscillations in sub-surface mixing.



Impact of intraseasonal wind bursts on SST variability in the far eastern Tropical Atlantic Ocean during boreal spring 2005 and 2006. Focus on the mid-May 2005 event

Wed, 04 Oct 2017 12:59:11 +0200

Impact of intraseasonal wind bursts on SST variability in the far eastern Tropical Atlantic Ocean during boreal spring 2005 and 2006. Focus on the mid-May 2005 event
Gaëlle Herbert and Bernard Bourlès
Ocean Sci. Discuss., https//doi.org/10.5194/os-2017-74,2017
Manuscript under review for OS (discussion: open, 1 comment)
The impact of boreal spring intraseasonal wind bursts on sea surface temperature variability in the eastern Tropical Atlantic in 2005 and 2006 is investigated. The cooling events induced by southerly wind bursts are modulated by local and remote forcing. A particularly strong wind event and a strong cooling occurred in mid-May 2005. It appears as a decisive event implied in the West African Monsoon onset. This study emphasizes the need to further document and monitor the South Atlantic region.