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Geochemical Processes: Water and Sediment Environments
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TLDR
The approach of this book to geochemistry can be summarized in the question: What happens, and how fast does it happen, when waters, solids, and gases interact in the earth's surface environment? The environment of the earths surface is made of solids and fluids, and the interactions among them are responsible for much of what is taking place in the physical world around us as mentioned in this paper.Abstract:
The approach of this book to geochemistry can be summarized in the question: What happens, and how fast does it happen, when waters, solids, and gases interact in the earths surface environment? The environment of the earths surface is made of solids and fluids, and theinteractions among them are responsible for much of what is taking place in the physical world around us. The dissolved load of natural waters and the materials of which sediments are made are the products of reactions taking place practically everywhere on land, in the atmosphere, and in the hydrosphere. Thus the term water and sediment environments applies effectivelly to much of the surface environment of the earth, including the zone of up to a few kilometers above and below the land and ocean surface. Evolution present itself to us as a more or less complex variety of processes-geological, physical, chemical, and biological. To this end, the inclusive title Geochemical Processes was chosen for the book, to introduce a text that emphasizes processes and time-dependent phenomena.read more
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Journal ArticleDOI
Deposition and resuspension of fine particles in a riverine ‘dead zone’
E. Tipping,C. Woof,K. Clarke +2 more
TL;DR: A simple mechanistic model of particle dynamics in the dead zone accounts reasonably well for particle accumulation rates when run with parameter values based on measured particle and hydraulic properties as discussed by the authors, which suggests that most of the sedimentation flux to the river bed is due to particles with equivalent sphere diameters in the range 30-240 μm.
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Belowground in situ redox dynamics and methanogenesis recovery in a degraded fen during dry-wet cycles and flooding
Cristian Estop-Aragonés,Cristian Estop-Aragonés,Klaus-Holger Knorr,Christian Blodau,Christian Blodau +4 more
TL;DR: In this article, the response to climate change induced drying and flooding may alter the redox conditions of organic matter decomposition in fen peat soils, leading to CO 2 and CH 4 degassing and regeneration of dissolved electron acceptors.
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Early diagenesis of organic matter in sediments off the coast of Peru
TL;DR: In this paper, a contribution supported by CUEA (NSF) from the Division of Oceanographic Scineces att he Brookhave National Laboraty and the Ecosystems Center of the Marine Biological Laboratory, Woods Hole Oceanographic Institution.
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Episodic deposition and 137Cs immobility in Skan Bay sediments: A ten-year 210Pb and 137Cs time series
TL;DR: In this paper, the average 210 Pb sedimentation rate (corrected for episodic deposition) in cores that were collected over a ten-year period (0.241 ± 0.006 g cm −2 yr −1 ) is in excellent agreement with the average 137 Cs sedimentation rates ( 0.258 ± 0.008 g cm−2 yr−1 ) calculated from three stratigraphic markers [peak fallout (1963), first appearance in the sediment record (1952), and the Chernobyl accident (1986)].
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Hydraulic exchange between a coral reef and surface sea water
TL;DR: In this paper, the authors used radon and salinity tracers to calculate the exchange rate between surface sea water and reef interstitial waters and found that radon concentrations are substantially higher in interstitial water than is surface water.