We measured accumulation rates of organic carbon (OC) and total nitrogen (TN) and stable carbon (dCorg) and nitrogen isotopes (d15N) in the sediments of two mountain lakes (Lake Ledvica and Lake Planina, northwest Slovenia). Marked variations of these parameters were observed in both sediments. OC accumulation rates ranged from 4 to 23 g m22 yr21 in Lake Ledvica, whereas in Lake Planina they we...

different types of sediment trap have been introduced so far to be used in erosion measuring stations, each with its own advantages and disadvantages in trapping aeolian particles. these traps have different collection and retention efficiency due to aerodynamic conditions. some characteristics such as isokinetic feature of the trap, collection efficiency, time needed to download sediment, capa...

To evaluate the impact of hazardous chemicals in solid wastes on man and other organisms, it is necessary to have information about amounts of chemical present, extent of exposure, and chemical toxicity. This paper addresses the question of organism exposure by considering the major physical and biological transport pathways and the physicochemical and biochemical transformations that may occur...

Mapping the abundance of C in leaf-wax components in surface sediments recovered from the seafloor off northwest Africa (0–35°N) reveals a clear pattern of dC distribution, indicating systematic changes in the proportions of terrestrial C3 and C4 plant input. At 20°N latitude, we find that isotopically enriched products characteristic of C4 plants account for more than 50% of the terrigenous in...

Each inner continental shelf region has an interesting combination of current, wave and sediment regimes. White et al. (1983) characterize the surface sediments off Corpus Christi, Texas, as dominantly very fine sand in the nearshore zone, from the shoreface out 6-8 km, transitioning to mud (silt-clay) farther offshore. The pattern does not vary substantially alongshore. They indicate that the ...

In order to better understand the source of minerals on the dark-colored ice, located in the Greenland ice sheet ablation zone, we analyzed the Sr and Nd isotopic ratios of minerals in cryoconite, which were collected from glaciers in northwest and southwest Greenland. We focused on the following: (i) comparison of the isotopes of minerals in cyroconite with those in sediments from local and di...

Lake sediment characterization, a prerequisite for the vulnerability assessment of lake ecosystems, demands reliable in situ methods for the characterization of the sediment layer composition. A unified characterization of lake sediments within lake ecotopes (open water, open water patches within the reed, and the reed) is still a challenge. Each ecotope is covered by different classical scient...

Numerous articles have recently reported on gas seepage offshore Svalbard, because the gas emission from these Arctic sediments was thought to result from gas hydrate dissociation, possibly triggered by anthropogenic ocean warming. We report on findings of a much broader seepage area, extending from 74° to 79°, where more than a thousand gas discharge sites were imaged as acoustic flares. The g...

introduction iran kaluts (yardang) which are considered as special models in terms of magnitude and extension have been shaped in the west part of the central lut desert. although these kaluts now are influenced by the selective windy erosion, they can be shaped through the process of wind and water erosion. the suitable environment for formation of these kaluts are the arid region together wit...

A series of controlled photolysis experiments using simulated sunlight was conducted in the presence and absence of estuarine bottom sediments to address the role of sediment resuspension on dissolved organic carbon (DOC) cycling in estuarine and coastal waters. In 0.2-mm-filtered estuarine water samples with no added sediment, DOC concentrations decreased from 0.4 to 3 mmol L21 h21 as a result...