Influence of natural surfactants on short wind waves in the coastal Peruvian waters
Ocean Sci. Discuss., 12, 1291-1325, doi:10.5194/osd-12-1291-2015, 2015
Multi-objective entropy evolutionary algorithm for marine oil spill detection using cosmo-skymed satellite data
Summary: This study has demonstrated work to optimize the oil spill footprint detection in synthetic aperture radar (SAR) data. Therefore, Entropy-based Multi-objective Evolutionary Algorithm (E-MMGA) has implemented with COSMO-SkyMed data during the oil spill event along the coastal water of along Koh Samet island, Thailand. Besides, Pareto optimal solution is implemented with E-MMGA to minimize the difficulties of oil spill footprint boundary detection because of the existence of look-alike in SAR.
Ocean Sci. Discuss., 12, 1263-1289, doi:10.5194/osd-12-1263-2015, 2015
Factors favouring large organic production in the northern Adriatic: towards the northern Adriatic empirical ecological model
Summary: Seasonal and interannual production changes in the northern Adriatic (NA) reflect on the total Adriatic bioproduction of certain species (i.e., anchovy). Long-term (1990-2004) phyto-abundance and geostrophic currents analysis relieves basic mechanism of NA biomass production changes. The results present a first step in building an empirical ecological model of the region, aiming to predict the amount of organic production in NA, which is to be used in the environmental management of the region.
Ocean Sci. Discuss., 12, 1219-1262, doi:10.5194/osd-12-1219-2015, 2015
Ocean modelling for aquaculture and fisheries in Irish waters
Ocean Sci. Discuss., 12, 1187-1217, doi:10.5194/osd-12-1187-2015, 2015
How essential are Argo observations to constrain a global ocean data assimilation system?
Summary: Argo profiling floats are continuously sampling the world ocean, given temperature and salinity profiles up to 2000 meter depth. This article addresses the impact of the current Argo array on real time ocean analysis and forecasts. 1-year Observing System Experiments were carried out with the ¼° global Mercator Ocean monitoring and forecasting system. The improvement due to the assimilation of the Argo profiles is estimated globally and regionally, showing a significant positive impact.
Ocean Sci. Discuss., 12, 1145-1186, doi:10.5194/osd-12-1145-2015, 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 ocean stratification. They yield a clear reduction in the model drift away from observations over multi-century long simulations including for independent bio-chemistry variables.
Ocean Sci. Discuss., 12, 1107-1143, doi:10.5194/osd-12-1107-2015, 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, different mean dynamic topographies are used to examine their impacts on the sea level anomaly assimilation. Results show that impacts of the mean dynamic topography cannot be neglected.
Ocean Sci. Discuss., 12, 1083-1105, doi:10.5194/osd-12-1083-2015, 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. Discuss., 12, 1051-1082, doi:10.5194/osd-12-1051-2015, 2015
Increasing transports of volume, heat, and salt towards the Arctic in the Faroe Current 1993–2013
Ocean Sci. Discuss., 12, 1013-1050, doi:10.5194/osd-12-1013-2015, 2015
Regime changes in global sea surface salinity trend
Summary: We estimate global surface salinity means and trends using historical (1950-2014) monthly fields and recent SMOS satellite data. We separate the regimes by fitting a Gaussian Mixture Model with a non-subjective method. There are three separate regimes: A (1950-1990) with small trends; B (1990-2009) with enhanced trends; and C (2009-2014) with significantly larger trends. The trend acceleration could be related to an enhanced hydrological cycle or to changes in sampling methodology.
Ocean Sci. Discuss., 12, 983-1011, doi:10.5194/osd-12-983-2015, 2015
An improved method for the determination of dissolved nitric oxide (NO) in seawater samples
Ocean Sci. Discuss., 12, 959-981, doi:10.5194/osd-12-959-2015, 2015
The open boundary equation
Ocean Sci. Discuss., 12, 925-958, doi:10.5194/osd-12-925-2015, 2015
Shifting momentum balance and frictional adjustment observed over the inner-shelf during a storm
Ocean Sci. Discuss., 12, 897-924, doi:10.5194/osd-12-897-2015, 2015
Sunda Shelf Seas: flushing rates and residence times
Summary: The Indonesian Sunda Shelf (average depth 48 m) is subject to many physical and biogeochemical processes with a strong impact from human activities. For investigation of marine environmental water properties, it is important to know characteristic water exchange rates. With realistic computer model results, analytical flushing rates and tracer residence times were compared for different shelf regions. Only the latter give detailed 3D pictures with times of less than 30 days to more than 2 years.
Ocean Sci. Discuss., 12, 863-895, doi:10.5194/osd-12-863-2015, 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 vary with a factor of ten throughout the year and (2) the frequency of the eddies shifts between 3-6 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. Discuss., 12, 823-861, doi:10.5194/osd-12-823-2015, 2015
Distribution of intermediate water masses in the subtropical northeast Atlantic
Ocean Sci. Discuss., 12, 769-822, doi:10.5194/osd-12-769-2015, 2015
Interactions between the Somali Current eddies during the summer monsoon: insights from a numerical study
Ocean Sci. Discuss., 12, 735-767, doi:10.5194/osd-12-735-2015, 2015
Sea level budget over 2005–2013: missing contributions and data errors
Ocean Sci. Discuss., 12, 701-734, doi:10.5194/osd-12-701-2015, 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. Discuss., 12, 673-699, doi:10.5194/osd-12-673-2015, 2015
Carbon-based phytoplankton size classes retrieved via ocean color estimates of the particle size distribution
Summary: Recent advances in ocean color remote sensing have allowed the quantification of the particle size distribution (and thus volume) of suspended particles in surface waters, using their backscattering signature. Here we leverage these developments and use volume-to-carbon allometric relationships to quantify phytoplankton carbon globally using SeaWiFS ocean color data. Phytoplankton carbon concentrations are partitioned among three size classes - picoplankton, nanoplankton, microplankton.
Ocean Sci. Discuss., 12, 573-644, doi:10.5194/osd-12-573-2015, 2015