1,721,432 research outputs found
Special Issue on geophysical processes in ABBaCo project (environmental restoration and bathing at SIN Bagnoli-Coroglio, Southern Tyrrhenian Sea)
No full textThis paper intends to provide the reader with an overview of the Special Issue (SI) on ABBaCo project, an extensive research project aimed to characterise the environmental quality and a possible remediation and restoration strategy of the marine area impacted by the Bagnoli industrial site. The main focus of this SI is to provide an up-to-date and comprehensive overview of the physical environment of the Bagnoli-Coroglio Bay (Gulf of Napoli, southern Tyrrhenian Sea) of the geophysical processes controlling the sediment dynamics and of the resulting pollutants distribution. Through eight contributions, an ensemble of interdisciplinary articles has been collected, emphasising the importance of tackling technical and scientific problems at different scales and from different points of view
The evolution of density currents and nepheloid bottom layers in the Ross Sea (Antarctica)
No full textIn this study we have analyzed the thermohaline, light transmission and particulate matter data, obtained in the western sector of the Ross Sea during the X Italian Expedition, for the purpose of investigating the evolution of the High Salinity Shelf Water in this area. In particular CTD data were used to estimate the baroclinic velocity field. Light transmission and total particulate matter data (from Niskin bottles mounted on a Carousel water sampler) were used to analyze the nepheloid layers and the evolution of the suspended sediments. This basin is characterized by a northward flow of very dense High Salinity Shelf Water (Ø = 1.95°C, S = 34.90), much colder than the incoming Circumpolar Deep Water (Ø = 1.20°C, S = 34.70). We obtained a scenario in which the High Salinity Shelf Water interacts with the Circumpolar Deep Water along the Antarctic Slope Front, and deviates from its geostrophic equilibrium. Interestingly, this cold dense water mixes with Circumpolar Deep Water at the shelf break and flows downward until it seems to disappear. Below this cold flow, a thin turbulent current has been observed, again moving northward with a high velocity 0.2–1.0 m s/1. This thin flow also contains high concentration of suspended matter produced by the interaction of the dense water and the bottom sediments. The various elementary mechanisms ruling the dynamics of such down-flows, namely the effects of topographic irregularities, bottom friction, Ekman benthic boundary layers or the effect of the variability of the Antarctic Circumpolar Current, which can push offshore the dense water, are discussed in this paper
- …
