An improved method for the determination of dissolved nitric oxide (NO) in seawater samples
Ocean Sci., 11, 937-946, doi:10.5194/os-11-937-2015, 2015
Evaluating the surface circulation in the Ebro delta (northeastern Spain) with quality-controlled high-frequency radar measurements
Summary: In this paper, we provide a detailed description of basic sea surface circulation features in the Ebro River delta (NW Mediterranean) as derived from reliable high-frequency radar surface current measurements. An integrated quality control approach has been applied to ensure the acquisition of accurate radar data, which remains a priority for the research community. This work should be of interest to readers in the areas of operational oceanography and also to a broad community of end-users.
Ocean Sci., 11, 921-935, doi:10.5194/os-11-921-2015, 2015
High-resolution satellite turbidity and sea surface temperature observations of river plume interactions during a significant flood event
Summary: Sea surface temperature and turbidity, derived from satellite imagery, were used to characterize river plumes in the northern Adriatic Sea during a significant flood event in November 2014. Circulation patterns and sea surface salinity, from an operational coupled ocean-wave model, supported the interpretation of the plumes' interaction with the receiving waters and among them.
Ocean Sci., 11, 909-920, doi:10.5194/os-11-909-2015, 2015
The RADMED monitoring programme as a tool for MSFD implementation: towards an ecosystem-based approach
Summary: The IEO-RADMED monitoring program is already conducting many of the evaluations required under the Marine Strategy Framework Directive (MFSD) along the Spanish Mediterranean coast. The different aspects of the ecosystem that are regularly sampled under this monitoring program are the physical environment and the chemical and biological variables of the water column, together with the planktonic communities, biomass and structure.
Ocean Sci., 11, 897-908, doi:10.5194/os-11-897-2015, 2015
Evaluation of numerical models by FerryBox and fixed platform in situ data in the southern North Sea
Summary: Automated measurement systems called FerryBox are installed on cargo ships in the North Sea. Operational model forecasts have been compared to FerryBox data of water temperature and salinity. We wanted to know how well the simulations agree with the observations. We found out that water temperature simulation gives satisfying results, while salinity simulation still could be improved. It turned out that assimilation of observational data into operational models gives strong benefits.
Ocean Sci., 11, 879-896, doi:10.5194/os-11-879-2015, 2015
Responses of atmospheric circulation to sea surface temperature anomalies in the South China Sea
Summary: The sea surface temperature (SST) anomalies in the South China Sea (SCS) and their influences on global atmospheric circulation were studied. The results of the simple atmospheric model suggested that the SCS SST anomalies can induce several barotropic wave trains from the SCS to other regions. The baroclinic stream function anomalies from the simple model showed an anticyclonic vortex pair and a cyclonic vortex pair.
Ocean Sci., 11, 873-878, doi:10.5194/os-11-873-2015, 2015
On the modulation of the periodicity of the Faroe Bank Channel overflow instabilities
Summary: Quasi-regular eddies are known to be generated in the outflow of dense water through the Faroe Bank Channel. One year long mooring records from the plume region show that (1) the energy associated with the eddies varies by a factor of 10 throughout the year and (2) the frequency of the eddies shifts between 3 and 6 days and is related to the strength of the outflow. Similar variability is shown by a high-resolution regional model and the observations agree with theory on baroclinic instability.
Ocean Sci., 11, 855-871, doi:10.5194/os-11-855-2015, 2015
On the observability of turbulent transport rates by Argo: supporting evidence from an inversion experiment
Summary: Results from the ECCO v4 ocean state estimate identify the constraint of fitting Argo profiles as an effective observational basis for inverse estimation of regional turbulent transport rates. The estimated parameters' geography is physically plausible and exhibits close connections with the observed upper-ocean stratification. They yield a clear reduction in the model drift away from observations over multi-century-long simulations, including for independent biochemistry variables.
Ocean Sci., 11, 839-853, doi:10.5194/os-11-839-2015, 2015
Impacts of mean dynamic topography on a regional ocean assimilation system
Summary: The altimetry data assimilation requires the addition of the mean dynamic topography to the altimetric sea level anomaly to match the model sea surface height. The mean dynamic topography is usually computed from the model long-term mean sea surface height. In this study, the impact of different mean dynamic topographies on the sea level anomaly assimilation is examined. Results show that impacts of the mean dynamic topography cannot be neglected.
Ocean Sci., 11, 829-837, doi:10.5194/os-11-829-2015, 2015
Distribution of intermediate water masses in the subtropical northeast Atlantic
Ocean Sci., 11, 803-827, doi:10.5194/os-11-803-2015, 2015
Sea level budget over 2005–2013: missing contributions and data errors
Ocean Sci., 11, 789-802, doi:10.5194/os-11-789-2015, 2015
Estimation of upward radiances and reflectances at the surface of the sea from above-surface measurements
Summary: A method which determines the radiance reflectance at the surface as well as the water-leaving and reflected radiances solely from the measurements of upward nadir radiance and downward irradiance in air is presented. A comparison between this method and in situ measurements shows that the average relative deviations between their results are less than or equal to 15% for the reflected radiance, at the studied wavelengths.
Ocean Sci., 11, 779-788, doi:10.5194/os-11-779-2015, 2015
Spatio-temporal variability of micro-, nano- and pico-phytoplankton in the Mediterranean Sea from satellite ocean colour data of SeaWiFS
Summary: We describe the seasonal and year-to-year variability of the spatial distribution of the phytoplankton size classes (PSCs) in the Mediterranean Sea using the time series of Sea-viewing Wide Field-of-view Sensor (SeaWiFS) observations (1998 to 2010). We used a chlorophyll-a-based model to estimate the phytoplankton composition. Our results, based on ocean colour data, confirm the seasonal and inter-annual pattern of the phytoplankton community observed from in situ data and in previous studies.
Ocean Sci., 11, 759-778, doi:10.5194/os-11-759-2015, 2015
Transport of volume, heat, and salt towards the Arctic in the Faroe Current 1993–2013
Summary: The Faroe Current is the main ocean current transporting warm Atlantic water into the Arctic region and an important transporter of heat towards the Arctic. This study documents observed transport variations over two decades, from 1993 to 2013. It shows that the volume transport of Atlantic water in this current increased by 9% over the period, whereas the heat transport increased by 18%. This increase will have contributed to the observed warming and sea ice decline in the Arctic.
Ocean Sci., 11, 743-757, doi:10.5194/os-11-743-2015, 2015
Global representation of tropical cyclone-induced short-term ocean thermal changes using Argo data
Summary: 1. Argo floats were used to examine tropical cyclone (TC) induced ocean thermal changes on the global scale by comparing temperature profiles before and after TC passage. 2. Global average of the vertical structure of the average ocean thermal response for two different categories: tropical storms/depressions (TS/TD) and hurricanes were presented. 3. Significant differences between weak storm (TS/TD) and strong storm (hurricane) were found.
Ocean Sci., 11, 719-741, doi:10.5194/os-11-719-2015, 2015
Perspectives of transient tracer applications and limiting cases
Summary: We use a suite of transient tracer measurements from a Southern Ocean sector southeast of Africa collected from 1998 and 2012 to quantify ventilation and change in ventilation. We found that the ventilation can be constrained by an inverse Gaussian transit time distribution north of the Subantarctic Front. We do not find any significant changes in upper ocean ventilation during this time period.
Ocean Sci., 11, 699-718, doi:10.5194/os-11-699-2015, 2015
Technical Note: Remote sensing of sea surface salinity using the propagation of low-frequency navigation signals
Summary: This paper introduces a potential method for determining the salinity of the ocean surface from long-wave radio signals used for navigation (and potentially other AM radio transmissions). Here we seek to retrieve ocean surface salinity averaged along a path across the North Sea between Denmark and the UK and compare our results with satellite-derived salinity.
Ocean Sci., 11, 695-698, doi:10.5194/os-11-695-2015, 2015
Mesoscale variability in the Arabian Sea from HYCOM model results and observations: impact on the Persian Gulf Water path
Summary: The Arabian Sea and Sea of Oman have a complex oceanic circulation, strongly influenced by the monsoons. The aim of this article is to describe the mesoscale processes that dominate the region, large eddies with a strong vertical influence, with their seasonal and interannual variability, from their formations, evolutions and interactions. Thus, an emphasis is placed on the highly saline Persian Gulf outflow in the Sea of Oman, and its interaction with the mesoscale circulation.
Ocean Sci., 11, 667-693, doi:10.5194/os-11-667-2015, 2015
Impact of currents on surface flux computations and their feedback on dynamics at regional scales
Summary: The paper studies the impact of the use of relative winds (i.e., winds minus ocean currents) to compute heat and momentum fluxes at sea surface. This was done in an area interested by mesoscale eddies and a local boundary current. Impact is relevant both for heat and momentum fluxes. Major differences can be observed in areas with large mesoscale activity. Results suggest that surface currents component in fluxes computation should not be neglected even at such scales and latitudes.
Ocean Sci., 11, 657-666, doi:10.5194/os-11-657-2015, 2015
Simulation of tsunami generation, propagation and coastal inundation in the Eastern Mediterranean
Summary: An advanced tsunami generation, propagation and coastal inundation model is applied to simulate representative earthquake-induced tsunami scenarios in the Eastern Mediterranean. Two areas of interest were selected after evaluating tsunamigenic zones and possible sources in the region: one at the SE of Crete (Greece) and one at the E of Sicily (Italy). Results are indicative of the model’s capabilities, as well of how areas in the Eastern Mediterranean would be affected by eventual larger events.
Ocean Sci., 11, 643-655, doi:10.5194/os-11-643-2015, 2015