Results 1 - 10 of 2083
Results 1 - 10 of 2083. Search took: 0.026 seconds
|Sort by: date | relevance|
[en] We present in this study the distribution of phenolic compounds in Syrian coastal waters. This study was carried out between May 1993 and March 1994 covering 23 oceanographic stations. The preliminary results indicate that the concentration of phenolic compounds in the rang between undetected (Considered as zero concentration and 28 μg/1). 76.1% of the total studied samples (Total number was 113 samples) contain less than 5 μg/1. These results demonstrate that the distribution of phenols in the Syrian coastal waters is under the influence of different factors such as the existence of industrial polluting sources and the dominant water currents in the studied areas. (author). 13 refs., 1 tab., 11 figs
[en] Measurements are evaluated which were obtained in autumn 1972 in the Flensburger Foerde. The currents are mainly caused by the local wind. Winds from the west set up a vertical circulation consistering of outflow in the surface layer, inflow in the lower layer and upwelling in the inner region. Lateral countercurrents at the entrance of the Foerde are not explained by the influence of the Coriolis force alone. The exchange of water depends on meteorological events and has typical scales of several days. Advection of water from the Kiel Bight is more important for water renewal than mixing. In a model the set-up of a wind-driven circulation and its influence on a originally horizontal homogeneous stratification is described. It turns out that the influence of internal density differences on velocity is negligible during most of the transition from the state of rest to the stationary state. (orig.)
[de]Es werden Messungen ausgewertet, die im Herbst 1972 in der Flensburger Foerde durchgefuehrt wurden. Die Stroemungen sind stark vom lokalen Wind abhaengig; weht er aus westlichen Richtungen, so hat er primaere Bedeutung fuer die Anregung einer Vertikalzirkulation, die oben Ausstrom, unten Einstrom und im Foerdeinneren Auftrieb bedeutet. Laterale Gegenlaeufigkeit in den Stroemungen am Foerdeeingang sind nicht nur durch Corioliseinwirkung zu erklaeren. Der Wasseraustausch der Foerde ist von besonderen meteorologischen Ereignissen abhaengig und benoetigt dann einen Zeitraum von mehreren Tagen. Dabei ist weniger Durchmischung als vielmehr Advektion von Wasser aus der Kieler Bucht fuer die Erneuerung verantwortlich. In einem Modell wird der Aufbau einer windgetriebenen Zirkulation beschrieben und deren Auswirkung auf eine anfangs horizontal homogene Schichtung berechnet. Es zeigt sich, dass in einem grossen Teil der Uebergangsphase vom Ruhestand zum stationaeren Zustand die Wirkung der internen Dichteunterschiede auf die Geschwindigkeit klein ist. (orig.)
[en] The survey of sea current with a flow direction and speed meter is generally performed to have knowledge and information on the state of flow in a sea area concerned. Such survey has been carried out for long in the sea off Tokai-mura, thereby the flow tendency up to several km offshore has been obtained. In the series of survey by PNC (Power Reactor and Nuclear Fuel Development Corporation) from 1974 to 1975, multi-point simultaneous flow survey was carried out. These results are described together with two- and three-dimensional flow characteristics. (Mori, K.)
[en] Microplastic has been confirmed as an emerging pollutant in marine environments. One of the primary environmental risks of microplastics is their bioavailability for aquatic organisms. Bivalves are of particular interest because their extensive filter-feeding activity exposes them directly to microplastics present in the water column. In the present study, we investigated microplastic pollution in mussels (Mytilus edulis) from 22 sites along 12,400 mile coastlines of China in 2015. The number of total microplastics varied from 0.9 to 4.6 items/g and from 1.5 to 7.6 items/individual. M. edulis contained more microplastics (2.7 items/g) in wild groups than that (1.6 items/g) in farmed groups. The abundance of microplastics was 3.3 items/g in mussels from the areas with intensive human activities and significantly higher than that (1.6 items/g) with less human activities. The most common microplastics were fibers, followed by fragments. The proportion of microplastics less than 250 μm in size arranged from 17% to 79% of the total microplastics. Diatom was distinguished from microplastics in mussels for the first time using Scanning Electron Microscope. Our results suggested that the numbers of microplastic kept within a relatively narrow range in mussels and were closely related to the contamination of the environments. We proposed that mussels could be used as a potential bioindicator of microplastic pollution of the coastal environment. - Highlights: • Microplastics varied from 0.9 to 4.6 items/g in Mytilus edulis. • M. edulis contained more microplastics in wild groups than farmed groups. • The most common microplastics were fibers. • Diatom was distinguished from microplastics in mussels. • Mussels could be used as a potential bioindicator of microplastic. - Microplastics varied from 0.9 to 4.6 items/g in wild and farmed Mytilus edulis from 22 sites along the coastal waters of China.