The flux of materials to the deep sea is dominated by larger, organic-rich particles with sinking rates varying between a few meters and several hundred meters per day. Mineral ballast may regulate the transfer of organic matter and other components by determining the sinking rates, e.g. via particle density. We calculated particle sinking rates from mass flux patterns and alkenone measurements...

Dredged material dumping is one of the most important locally generated problems to be considered in harbors’ management. The present work was carried out assess physical and particle size characteristics seabed core sediments Damietta harbor basin offshore area, with main aim proposing a synergetic approach sediment In addition tosuggestinga new site that will solve problem redispersing dumped...

Bicarbonate and calcium set bounds on photosynthesis degradation processes in calcareous freshwaters. Charophytic algae use bicarbonate photosynthesis, direct variable proportions to assimilate organic carbon precipitate carbonate their surfaces. To evaluate pools of (Corg), (Ccarbonate), phosphorus (P) dense charophyte vegetation, we studied apical basal tissue surface precipitates, as well un...

Thick, late Quaternary sediment sections were recovered at several sites on the leeward slope of Great Bahama Bank during Leg 166 of the Ocean Drilling Program. These sections have paleoceanographic records with potentially high temporal resolution. To make an initial assessment of the records corresponding to the Holocene highstand of sea level, we have identified and dated the sediments from ...

Planet Earth is undergoing rapid environmental change at what is probably an unprecedented rate, even on geologic timescales of tens of millions of years. Coral reefs are at the forefront of these changes being extremely sensitive to the threats from both climate change and direct local human impacts on the marine environment. Locally, land-use changes in river catchments, wetlands, and estuari...

Diffuse reflectance spectra measured during shipboard core description with a hand-held Minolta spectrophotometer are reliable data for interpreting sediment composition. Factor analysis of these spectra indicates that only Glad Cling Wrap, a polyethylene food wrap, should be used to cover wet cores during measurement because it introduces substantially less noise into the spectra than other b...

Three sediment cores were collected in the Scheldt, Lys and Spiere canals, which drain a highly populated and industrialized area in Western Europe. The speciation and the distribution of trace metals in pore waters and sediment particles were assessed through a combination of computational and experimental techniques. The concentrations of dissolved major and trace elements and Zn) were used t...

Mercury (Hg) contamination in coastal sediments has been widely studied in clay deposits; however, equivalent results on carbonated sediments are scarce. This article aims to study Hg distribution in Lebanese carbonate coastal marine sediments (Eastern Mediterranean) in order to characterize their contamination level and to explore the postdepositional mobility of methylmercury (MeHg) in the de...

We investigated the annual changes in sediment fluxes at two depths in Lake Lugano, Switzerland, and the associated variations in carbon and nitrogen isotope composition of sedimenting organic matter. The organic carbon and nitrogen fluxes increased by 10 and 20% with depth, respectively, whereas particulate phosphorus fluxes showed an increase of 114% with depth. The 8°C and 615N of organic ma...