The Experts below are selected from a list of 86349 Experts worldwide ranked by ideXlab platform
Zhigang Guo - One of the best experts on this subject based on the ideXlab platform.
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the role of shelf mud Depositional Process and large river inputs on the fate of organochlorine pesticides in sediments of the yellow and east china seas
Geophysical Research Letters, 2011Co-Authors: Tian Lin, Xuefa Shi, Zuosheng Yang, Houjie Wang, Gan Zhang, Zhigang GuoAbstract:[1] The distribution and fate of dichlorodiphenyltrichloroethanes (DDTs) and hexachlorocyclohexanes (HCHs) in sediments from the East China Sea (ECS) and the Yellow Sea (YS) were compared and studied in this work. The ECS has directly large river-dominated inputs of sediment-associated pollutants while the YS does not. The results indicated that these mud deposits of the YS and ECS were the sinks of land-originated DDTs and HCHs. The consistence of these OCP species and total organic carbon (TOC) and the sediment grain size in the YS indicated that the shelf mud Depositional Process was the dominant factor in controlling the distribution and fate of these organic compounds under the more homogeneous and hydrodynamic-based sedimentary conditions of the YS. The distribution of these chemicals in the coastal ECS, however, showed a much different pattern where the concentrations of DDTs and HCHs decreased with distance from the coast, and the correlations between DDTs and HCHs with TOC were very poor. This indicates that the continuous transferring of organochlorine pesticides (OCPs) into the coastal ECS by the direct riverine inputs and surface runoffs play a key role on the occurrence and fate of OCPs within this more heterogeneous environmental system.
Bradford E Prather - One of the best experts on this subject based on the ideXlab platform.
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calibration and visualization of Depositional Process models for above grade slopes a case study from the gulf of mexico
Marine and Petroleum Geology, 2000Co-Authors: Bradford E PratherAbstract:Abstract Mobile substrates with relatively large amounts of ponded-basin and healed-slope accommodation space across the mid-slope characterize above-grade slopes. There are many above-grade slopes around the world but the Gulf of Mexico (GOM) is arguably the best calibrated one. Because of the unique geologic Processes attributed to the GOM, however, such as high rates of intraslope basin subsidence (locally >10 km/Ma) and meltwater spikes, the transfer of Depositional Process concepts to other deep-water provinces may not seem intuitively obvious. Ponded-basin ‘fill-and-spill’ Processes dominate early phases of deposition on above-grade slopes and precede progradation of unconfined slopes. A stepped-equilibrium profile across a series of ponded basin forms a base for late unconfined slope progradation. Deposition in the unconfined slope occurs in both slope and healed-slope accommodation space. These spaces are filled as progradational delta fronts build beyond critical angles, and later collapsed. Sediments tend to be sand lean because the slope angles are too high to allow turbidite fan deposition. Sands are generally associated with channels with some localized sheet sands. This paper describes the use of a proprietary stratigraphic forward modeling application (STRATAGEM) to visualize and distill a GOM-based Depositional Process model potentially transferable to other slope and base-of-slope systems. Forward models show that the introduction of meltwater spikes do not radically change the Depositional architecture of the slope but they do force gravity flow deposition to continue into eustatic sea level rises. These models also show that rapid salt withdrawal beneath intraslopes basins controls the distribution of accommodation space across the slope and thus its stratigraphic architecture.
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calibration and visualization of Depositional Process models for above grade slopes a case study from the gulf of mexico
Marine and Petroleum Geology, 2000Co-Authors: Bradford E PratherAbstract:Abstract Mobile substrates with relatively large amounts of ponded-basin and healed-slope accommodation space across the mid-slope characterize above-grade slopes. There are many above-grade slopes around the world but the Gulf of Mexico (GOM) is arguably the best calibrated one. Because of the unique geologic Processes attributed to the GOM, however, such as high rates of intraslope basin subsidence (locally >10 km/Ma) and meltwater spikes, the transfer of Depositional Process concepts to other deep-water provinces may not seem intuitively obvious. Ponded-basin ‘fill-and-spill’ Processes dominate early phases of deposition on above-grade slopes and precede progradation of unconfined slopes. A stepped-equilibrium profile across a series of ponded basin forms a base for late unconfined slope progradation. Deposition in the unconfined slope occurs in both slope and healed-slope accommodation space. These spaces are filled as progradational delta fronts build beyond critical angles, and later collapsed. Sediments tend to be sand lean because the slope angles are too high to allow turbidite fan deposition. Sands are generally associated with channels with some localized sheet sands. This paper describes the use of a proprietary stratigraphic forward modeling application (STRATAGEM) to visualize and distill a GOM-based Depositional Process model potentially transferable to other slope and base-of-slope systems. Forward models show that the introduction of meltwater spikes do not radically change the Depositional architecture of the slope but they do force gravity flow deposition to continue into eustatic sea level rises. These models also show that rapid salt withdrawal beneath intraslopes basins controls the distribution of accommodation space across the slope and thus its stratigraphic architecture.
S Schouten - One of the best experts on this subject based on the ideXlab platform.
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transport and Depositional Process of soil organic matter during wet and dry storms on the tet inner shelf nw mediterranean
Palaeogeography Palaeoclimatology Palaeoecology, 2009Co-Authors: J H Kim, Rosalyne Buscail, Francois Bourrin, Albert Palanques, J Sinninghe S Damste, Jerome Bonnin, S SchoutenAbstract:ARTICLE I NFO River floods and storm waves are major Processes for the dispersal and deposition of terrestrial organic matter (OM) in river-dominated coastal areas. A "wet storm" is connected to a flood with a high river discharge, while a "dry storm" is not associated with a flood. To better understand the sedimentation dynamics of terrestrial OM, especially soil OM, at the land-ocean interface during wet and dry storms, we studied sediment trap and core material collected on the Tet inner shelf (NW Mediterranean) using multiple organic proxies in combination with hydrodynamic parameters. The proportion of soil OM to the total OM in the trap material calculated based on the BIT (Branched and Isoprenoid Tetraether) index was higher during both wet (~40%) and dry (~30%) storms than during non-storm periods (~10%). However, only surface sediments (1-cm thick layers) recovered after December wet and moderate storms in 2003 showed enhanced soil OM percentages compared to the deeper sediments deposited during the last century. Given that the wet storm eroded 4-cm of seabed at the study site, flood-induced fresh soil OM was not deposited on the Tet inner shelf during the wet storm. However, the following moderate storm caused resuspension of flood- associated soil OM which was previously trapped nearshore. Accordingly soil OM was transported to the Tet inner shelf and stored there until the dry storm occurred.
Jerome Bonnin - One of the best experts on this subject based on the ideXlab platform.
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transport and Depositional Process of soil organic matter during wet and dry storms on the tet inner shelf nw mediterranean
Palaeogeography Palaeoclimatology Palaeoecology, 2009Co-Authors: J H Kim, Rosalyne Buscail, Francois Bourrin, Albert Palanques, J Sinninghe S Damste, Jerome Bonnin, S SchoutenAbstract:ARTICLE I NFO River floods and storm waves are major Processes for the dispersal and deposition of terrestrial organic matter (OM) in river-dominated coastal areas. A "wet storm" is connected to a flood with a high river discharge, while a "dry storm" is not associated with a flood. To better understand the sedimentation dynamics of terrestrial OM, especially soil OM, at the land-ocean interface during wet and dry storms, we studied sediment trap and core material collected on the Tet inner shelf (NW Mediterranean) using multiple organic proxies in combination with hydrodynamic parameters. The proportion of soil OM to the total OM in the trap material calculated based on the BIT (Branched and Isoprenoid Tetraether) index was higher during both wet (~40%) and dry (~30%) storms than during non-storm periods (~10%). However, only surface sediments (1-cm thick layers) recovered after December wet and moderate storms in 2003 showed enhanced soil OM percentages compared to the deeper sediments deposited during the last century. Given that the wet storm eroded 4-cm of seabed at the study site, flood-induced fresh soil OM was not deposited on the Tet inner shelf during the wet storm. However, the following moderate storm caused resuspension of flood- associated soil OM which was previously trapped nearshore. Accordingly soil OM was transported to the Tet inner shelf and stored there until the dry storm occurred.
Francois Bourrin - One of the best experts on this subject based on the ideXlab platform.
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transport and Depositional Process of soil organic matter during wet and dry storms on the tet inner shelf nw mediterranean
Palaeogeography Palaeoclimatology Palaeoecology, 2009Co-Authors: J H Kim, Rosalyne Buscail, Francois Bourrin, Albert Palanques, J Sinninghe S Damste, Jerome Bonnin, S SchoutenAbstract:ARTICLE I NFO River floods and storm waves are major Processes for the dispersal and deposition of terrestrial organic matter (OM) in river-dominated coastal areas. A "wet storm" is connected to a flood with a high river discharge, while a "dry storm" is not associated with a flood. To better understand the sedimentation dynamics of terrestrial OM, especially soil OM, at the land-ocean interface during wet and dry storms, we studied sediment trap and core material collected on the Tet inner shelf (NW Mediterranean) using multiple organic proxies in combination with hydrodynamic parameters. The proportion of soil OM to the total OM in the trap material calculated based on the BIT (Branched and Isoprenoid Tetraether) index was higher during both wet (~40%) and dry (~30%) storms than during non-storm periods (~10%). However, only surface sediments (1-cm thick layers) recovered after December wet and moderate storms in 2003 showed enhanced soil OM percentages compared to the deeper sediments deposited during the last century. Given that the wet storm eroded 4-cm of seabed at the study site, flood-induced fresh soil OM was not deposited on the Tet inner shelf during the wet storm. However, the following moderate storm caused resuspension of flood- associated soil OM which was previously trapped nearshore. Accordingly soil OM was transported to the Tet inner shelf and stored there until the dry storm occurred.