scholarly journals Results of the first Wave Glider experiment in the southern Tyrrhenian Sea

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Giuseppe Aulicino ◽  
Yuri Cotroneo ◽  
Teodosio Lacava ◽  
Giancanio Sileo ◽  
Giannetta Fusco ◽  
...  
Keyword(s):  
Optical Properties ◽  
Autonomous Vehicle ◽  
Sea Surface ◽  
Preliminary Evaluation ◽  
Tyrrhenian Sea ◽  
Surface Parameters ◽  
Spatial And Temporal Scales ◽  
Gulf Of Naples ◽  
Southern Tyrrhenian Sea ◽  
Wave Glider

<p>A wave-propelled autonomous vehicle (Wave Glider) instrumented with a variety of oceanographic and meteorological sensors was launched from Gulf of Naples on the 12<sup>th </sup>of September 2012 for a two-week mission in the Southern Tyrrhenian Sea. The main objective of the mission was a preliminary evaluation of the potential of commercial autonomous platforms to provide reliable measurements of sea surface parameters which can complement existing satellite based products moving from the local to the synoptic scale. To this aim Wave Glider measurements were compared to equivalent, or near-equivalent, satellite products achieved from MODIS (Moderate Resolution Imaging Spectroradiometer) sensors onboard the EOS (Earth Observing System) satellite platforms and from AVISO (Archiving Validation and Interpretation of Satellite Oceanographic Data). Level-3 near real time and Level-4 reprocessed sea surface foundation temperature products provided by the CMEMS (Copernicus Marine Environment Monitoring Service) were also included in this study as well as high resolution model output supplied by NEMO (Nucleus for European Modelling of the Ocean). The Wave Glider was equipped with sensors to measure temperature, salinity, currents, as well as Colored Dissolved Organic Matter (CDOM), turbidity and refined fuels fluorescence. The achieved results confirmed the emerging value of Wave Gliders in the framework of multiplatform monitoring systems of the ocean surface parameters. In particular, they showed that Wave Glider measurements captured the southern Tyrrhenian Sea major surface oceanographic features, including the coast to open sea haline gradient and the presence of a cyclone-anticyclone system in the southeastern sub-region. The Wave Glider also had the capability to monitor upper ocean currents at finer spatial and temporal scales than satellite altimetric observations and model outputs. Nonetheless, results stressed the existence of several limits in the combined use of satellite and Wave Glider observations and the necessity of further analyses concerning the monitoring of the ocean optical properties. In fact, Wave Glider and satellite-based products agree in terms of sea surface temperature and currents patterns, while bio-optical properties turned out to be less well correlated. No significant traces of refined fuels have been detected along the WG track.</p>

scholarly journals Syntopic Cystoseira taxa support different molluscan assemblages in the Gulf of Naples (southern Tyrrhenian Sea)

2019 ◽  
Vol 70 (11) ◽  
pp. 1561 ◽  
Author(s):  
Antonia Chiarore ◽  
Iacopo Bertocci ◽  
Sara Fioretti ◽  
Angela Meccariello ◽  
Giuseppe Saccone ◽  
...  
Keyword(s):  
Benthic Fauna ◽  
Shannon Index ◽  
Tyrrhenian Sea ◽  
Brown Macroalgae ◽  
Gulf Of Naples ◽  
Invertebrate Biodiversity ◽  
Southern Tyrrhenian Sea ◽  
Species Specific ◽  
June July ◽  
Shed Light

Brown macroalgae belonging to the genus Cystoseira (Fucales: Sargassaceae) are canopy-forming organisms the recent decline of which at a basin and local scale has been widely documented, which urgently calls for research to fill knowledge gaps and support new and effective measures for protection. We, hereby, characterised the molluscan assemblages associated with three Cystoseira taxa (C. amentacea, C. compressa and C. crinita) from Ischia Island (Italy, Tyrrhenian Sea), and tested whether different congeneric taxa may syntopically support a different biota. In particular, these assemblages were compared among three Cystoseira species, between two times of sampling (June–July 2015 and June–July 2016), and among six sites in terms of multivariate structure (identity and relative abundances of constituting taxa combined, and presence–absence composition), as well as for synthetic measures of diversity, including the total richness of taxa, the exponential Shannon index and the reciprocal Simpson index. In total, 24736 molluscan individuals were collected, overall belonging to 52 taxa. The majority of the identified species included micrograzers and filter feeders, which is in agreement with similar previous studies. The composition of associated molluscan assemblages, which was mainly represented by juvenile individuals, differed among the three Cystoseira species, suggesting that even congeneric taxa do not support an analogous benthic fauna. The present findings have shed light on the molluscan biota associated with Cystoseira taxa in the Gulf of Naples and strengthened the importance of such habitat-forming macroalgae in structuring the local infralittoral invertebrate biodiversity and as a nursery for species-specific associated molluscs.

Multiplatform observation of the surface circulation in the Gulf of Naples (Southern Tyrrhenian Sea)

2011 ◽  
Vol 61 (6) ◽  
pp. 779-796 ◽  
Author(s):  
Marco Uttieri ◽  
Daniela Cianelli ◽  
Bruno Buongiorno Nardelli ◽  
Berardino Buonocore ◽  
Pierpaolo Falco ◽  
...  
Keyword(s):  
Tyrrhenian Sea ◽  
Gulf Of Naples ◽  
Surface Circulation ◽  
Southern Tyrrhenian Sea

Polychlorinated Biphenyls and Organochlorine Pesticides in Seafood from the Gulf of Naples (Italy)

2007 ◽  
Vol 70 (3) ◽  
pp. 706-715 ◽  
Author(s):  
MARIA CARMELA FERRANTE ◽  
TERESA CIRILLO ◽  
BARBARA NASO ◽  
MARIA TERESA CLAUSI ◽  
ANTONIA LUCISANO ◽  
...  
Keyword(s):  
Polychlorinated Biphenyls ◽  
Organochlorine Pesticides ◽  
Health Hazard ◽  
Marine Species ◽  
Tyrrhenian Sea ◽  
The European Union ◽  
Atlantic Mackerel ◽  
Gulf Of Naples ◽  
Mediterranean Mussel ◽  
Southern Tyrrhenian Sea

Seven target polychlorinated biphenyls (PCBs; IUPAC nos. 28, 52, 101, 118, 138, 153, and 180) and the organochlorine pesticides (OCPs) hexachlorobenzene (HCB) and dichlorodiphenyltrichloroethane (DDT) and its related metabolites (p,p′-DDT, p,p′-DDE, and p,p′-DDD) were quantified in edible tissues from seven marine species (European hake, red mullet, blue whiting, Atlantic mackerel, blue and red shrimp, European flying squid, and Mediterranean mussel) from the Gulf of Naples in the southern Tyrrhenian Sea (Italy). PCBs 118, 138, and 153 were the dominant congeners in all the species examined. The concentrations of all PCBs (from not detectable to 15,427 ng g−1 fat weight) exceeded those of all the DDTs (from not detectable to 1,769 ng g−1 fat weight) and HCB (not detectable to 150.60 ng g−1 fat weight) in the samples analyzed. The OCP concentrations were below the maximum residue limits established for fish and aquatic products by the Decreto Minis-terale 13 May 2005 in all the samples analyzed; therefore the OCPs in the southern Tyrrhenian Sea species are unlikely to be a significant health hazard. Conversely, the mean concentrations of PCBs exceeded (greatly in some cases) the current limits (200 ng−1 fat weight) set by the European Union for terrestrial foods. Although the manufacture and use of PCBs are banned or highly restricted, these compounds still are important persistent chemical contaminants in the Gulf of Naples.

scholarly journals Bioclastic Deposits in the NW Gulf of Naples (Southern Tyrrhenian Sea, Italy): A Focus on New Sedimentological and Stratigraphic Data around the Island of Ischia

2020 ◽  
Author(s):  
Gemma Aiello
Keyword(s):  
Posidonia Oceanica ◽  
Coarse Grained ◽  
Tyrrhenian Sea ◽  
Gulf Of Naples ◽  
Sea Bottom ◽  
Southern Tyrrhenian Sea ◽  
Marine Areas ◽  
Rearrangement Processes ◽  
Water Depths

Bioclastic deposits in the Gulf of Naples have been studied and compared based on new sedimentological and stratigraphic data, particularly referring to the rhodolith layers. They represent detrital facies deriving mainly from in situ rearrangement processes of organogenic material on rocky sea bottoms. These deposits are composed of medium-coarse-grained sands and bioclastic gravels in a scarce pelitic matrix and crop out at the sea bottom in a portion of the inner shelf located at water depths between −20 m and −50 m. Below water depths of −30 m the bioclastic deposits are rhodolith, characterized by gravels and lithoclastic sands. Rhodolith deposits are often found near the Posidonia oceanica meadows and/or in protected areas near the rocky outcrops. The Ischia Bank represents an excellent natural laboratory for studying the rhodolith layers. On the Ischia Bank, below the Posidonia oceanica meadow, both bioclastic sands immersed in a muddy matrix and volcaniclastic gravels were sampled. Both the Mollusk shells and the volcaniclastic fragments, where the contribution of the silty and sandy fractions is lower than 20%, were colonized by some species of red algae, while in the marine areas with a low gradient a maërl facies was deposited.

scholarly journals Neural Network Approach to Retrieving Ocean Subsurface Temperatures from Surface Parameters Observed by Satellites

Water ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 388
Author(s):  
Hao Cheng ◽  
Liang Sun ◽  
Jiagen Li
Keyword(s):  
Neural Network ◽  
Pacific Ocean ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Sea Surface ◽  
Satellite Measurements ◽  
Surface Parameters ◽  
The North ◽  
The North Pacific ◽  
Bpnn Model

The extraction of physical information about the subsurface ocean from surface information obtained from satellite measurements is both important and challenging. We introduce a back-propagation neural network (BPNN) method to determine the subsurface temperature of the North Pacific Ocean by selecting the optimum input combination of sea surface parameters obtained from satellite measurements. In addition to sea surface height (SSH), sea surface temperature (SST), sea surface salinity (SSS) and sea surface wind (SSW), we also included the sea surface velocity (SSV) as a new component in our study. This allowed us to partially resolve the non-linear subsurface dynamics associated with advection, which improved the estimated results, especially in regions with strong currents. The accuracy of the estimated results was verified with reprocessed observational datasets. Our results show that the BPNN model can accurately estimate the subsurface (upper 1000 m) temperature of the North Pacific Ocean. The corresponding mean square errors were 0.868 and 0.802 using four (SSH, SST, SSS and SSW) and five (SSH, SST, SSS, SSW and SSV) input parameters and the average coefficients of determination were 0.952 and 0.967, respectively. The input of the SSV in addition to the SSH, SST, SSS and SSW therefore has a positive impact on the BPNN model and helps to improve the accuracy of the estimation. This study provides important technical support for retrieving thermal information about the ocean interior from surface satellite remote sensing observations, which will help to expand the scope of satellite measurements of the ocean.

Distribution patterns and population structure of Illex coindetii (Cephalopoda: Ommastrephidae) in the Southern Tyrrhenian Sea: Historical series of 14 years trawl survey

2011 ◽  
Vol 109 (2-3) ◽  
pp. 342-350 ◽  
Author(s):  
Anna Perdichizzi ◽  
Laura Pirrera ◽  
Daniela Giordano ◽  
Francesco Perdichizzi ◽  
Barbara Busalacchi ◽  
...  
Keyword(s):  
Population Structure ◽  
Distribution Patterns ◽  
Trawl Survey ◽  
Tyrrhenian Sea ◽  
Historical Series ◽  
Southern Tyrrhenian Sea
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