Results 261 to 270 of about 198,315 (312)
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Geochronology of lake sediments
Earth and Planetary Science Letters, 1971Abstract This paper describes partially successful attempts to measure rates of sedimentation in lakes using radiometric techniques. We show that 210 Pb activity precipitated from the atmosphere is ideal for dating lake sediments of ⩽ 100 yr age. In fresh waters, lead is quickly removed from solution on to particulate matter so that unsupported 210
S. Krishnaswamy +3 more
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Lake Sediments: Algal Availability of Lake Burley Griffin Sediment Phosphorus
1980This paper reports an experiment to estimate the amounts of phosphorus in lake sediment that may be available to phytoplankton. It is known that sediment can continue to maintain a polluted lake in an eutrophic condition (Bjork et al., 1972; Bengtsson et al., 1975).
Ronald S. Rosich, Peter Cullen
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Journal of Radioanalytical and Nuclear Chemistry Articles, 1992
Bottom and sestonic sediments of Ypacarai Lake were invesetigated with XRF and Mossbauer techniques. The 120 km2 lake, depth averages 1.8 m. In addition to the lakes use for recreation, its basin has economic significance. Sediments play an important role in the distribution of trace elements in the aquatic system and as a sink for metals.
R. Velazquez, R. Alviso, J. Facetti
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Bottom and sestonic sediments of Ypacarai Lake were invesetigated with XRF and Mossbauer techniques. The 120 km2 lake, depth averages 1.8 m. In addition to the lakes use for recreation, its basin has economic significance. Sediments play an important role in the distribution of trace elements in the aquatic system and as a sink for metals.
R. Velazquez, R. Alviso, J. Facetti
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Glacial lake sedimentation, Austerdalsisen, Norway
Sedimentology, 1976ABSTRACTSediments deposited in a lake at the front of a glacier in the Svartisen area, Norway, have been studied between 1957 and 1974. Until 1959, they were almost completely covered by an outwash plain (sandur), but subsequent erosion has exposed glacial lake sediments more than 70 m deep within a rock basin about 2·5 km long and 1 km wide. The basin
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2007
Varved or annually laminated lake sediments offer an incremental dating technique that also provides high-resolution climatic and environmental data and information about related forcing mechanisms. The first definition of varves by De Geer (1912)was restricted to rhythmically deposited proglacial clays.
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Varved or annually laminated lake sediments offer an incremental dating technique that also provides high-resolution climatic and environmental data and information about related forcing mechanisms. The first definition of varves by De Geer (1912)was restricted to rhythmically deposited proglacial clays.
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Ebullition from lake sediments
2023Methane ebullition (bubbling) from lake sediments is an important source of atmospheric methane. Rising bubbles can also negatively impact water quality. However, most ebullition surveys measure ebullition at intervals that are much greater than the duration of ebullition events (typically 2-4 days), introducing uncertainties in our understanding of ...
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Journal of Radioanalytical and Nuclear Chemistry, 1997
For a better understanding of the behaviour of90Sr in aquatic systems, this β-emitter has been determined in the different layers of a lake sediment core which has been previously dated using the well established210Pb dating method. For this, a radiochemical technique has been developed for the isolation of strontium from the sediment samples and for ...
G. Manjón +2 more
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For a better understanding of the behaviour of90Sr in aquatic systems, this β-emitter has been determined in the different layers of a lake sediment core which has been previously dated using the well established210Pb dating method. For this, a radiochemical technique has been developed for the isolation of strontium from the sediment samples and for ...
G. Manjón +2 more
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Journal of Great Lakes Research, 1978
Abstract 406 samples were taken of the surficial 3 cms of sediment from Lake Superior in 1973. A description of these samples together with the interpretation of continuous echo-sounding records resulted in a description of the surface sediment distribution which is interpreted in the light of the glacial and postglacial evolution of the lake basin ...
R.L. Thomas, C.I. Dell
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Abstract 406 samples were taken of the surficial 3 cms of sediment from Lake Superior in 1973. A description of these samples together with the interpretation of continuous echo-sounding records resulted in a description of the surface sediment distribution which is interpreted in the light of the glacial and postglacial evolution of the lake basin ...
R.L. Thomas, C.I. Dell
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Denitrification in Lake Sediments
Environmental Letters, 1973Abstract The capacity of selected calcareous and non-calcareous lake sediments from Wisconsin to reduce NO3-N gas to N2 gas under anaerobic conditions was examined. Although the individual rates of denitrification varied, all lake sediments examined were able to convert approximately 70% of added NO3-N to N2. In one case, approximately 65% of added NO2-
A. N. Macgregor, D. R. Keeney
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1996
Many of the methods described in Chap. 1 for analysis would be applicable without modification to lake and pond sediments. The methods described in this chapter have been specifically applied to lake and pond sediments, and are grouped together here for convenience.
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Many of the methods described in Chap. 1 for analysis would be applicable without modification to lake and pond sediments. The methods described in this chapter have been specifically applied to lake and pond sediments, and are grouped together here for convenience.
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