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PORTAIL D'INFORMATION GÉOGRAPHIQUE

Résultats de la recherche (30 résultats)

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  • Capacité de charge ; Charge solide ; Déglaciation ; Eau de fonte ; Fluvioglaciaire ; Glaciologie ; Groenland ; Isotope ; Région polaire ; Sédimentologie ; Technique de recherche ; Traceur ; Zone froide
  • Carrying capacity ; Cold area ; Deglaciation ; Fluvioglacial features ; Glaciology ; Greenland ; Isotope ; Meltwater ; Polar region ; Research technique ; Sediment load ; Sedimentology ; Tracer
  • Etude du charriage de matières grossières dans une vallée glaciaire à Sermilik au sud-est du Groenland au moyen d'une technique de radio-traçage et de prélèvements manuels. Il semble que les sédiments grossiers qui se trouvent à la surface de la
  • zone deltaïque soient des vestiges d'anciennes phases de transport sédimentaire. Parallèlement aux résultats sédimentologiques, les AA. ont pu prouver le bon fonctionnement de la technique de radio-traçage PETSY dans des conditions arctiques.
  • 1996
  • Estimating rates of denudation using cosmogenic isotope abundances in sediment
  • Erosion rate ; Isotope analysis ; Methodology ; Model ; Sediment budget ; Soil erosion ; Watershed
  • This paper proposes, as a testable hypothesis, a basin-scale approach for interpreting the abundance of in situ produced cosmogenic isotopes, an approach which considers explicitly both the isotope and sediment flux through a drainage basin
  • . This model is designed for interpreting isotope abundance in sediment. The AA. suggest that measured isotope abundances may reflect spatially averaged rates of erosion if a basin is in isotopic steady state and if sampled sediments are well mixed.
  • 1996
  • Aquifer ; Atlantic Ocean ; Baltic Sea ; Bay ; Coastal environment ; Deuterium ; Drainage ; Groundwater ; Hydrochemistry ; Isotope analysis ; Oxygen 18 ; Poland ; Salinity ; Sea water
  • This article presents the results of a study carried out in the Puck Bay concerning the alterations of pore water chlorinity, pore water (O 18, D) isotope composition and near-bottom water salinity caused by groundwater seepage. The groundwater
  • seepage decreases the chlorinity of interstitial water and the salinity of near-bottom water. The comparison of the oxygen and hydrogen isotope composition of underground, interstitial and near-bottom waters indicated a reduction of the content of heavy
  • isotopes in the interstitial water and thus gave evidence of freshwater seepage through the sea floor.
  • 1996
  • Stable isotope and lithologic evidence of late-Glacial and Holocene oceanography of the Northwestern Pacific and its marginal seas
  • Carbonate ; Core sampling ; Deglaciation ; Foraminifera ; Geochemistry ; Holocene ; Isotope analysis ; Lateglacial ; Lithology ; Marine sediment ; Ocean ; Oxygen 18 ; Pacific Region ; Palaeogeography ; Sea level
  • Stable isotopes, geochemical, lithological, and micropaleontological results from cores from the far northwest (FNW) Pacific and the Okhotsk and Bering seas are used to reconstruct the regional environment for the last glaciation, the deglacial
  • 1996
  • Climatic reconstruction of glacial to interglacial episodes from oxygen isotopes in sediment cores from the Nordic seas is complicated by strong local meltwater contributions to the oxygen isotope changes. Combination of benthic and planktic
  • foraminiferal isotope data with foraminiferal abundances and ice-rafted debris (IRD) suggest that during the deglacial transition (Termination II) the climatic evolution in the Nordic seas was less affected by abrupt changes in ocean-atmosphere circulation than
  • 1996
  • Postglacial precipitation δ18O has been reconstructed for 2 regions of Canada and provides contrasting views of the isotopic signals of changing climate. Although the results emphasize the uncertainties involved in teasing paleoclimate information
  • out of isotopic archives , they also highlight the value of primary isotopic signals independent of their usefulness as proxies for parameters such as paleotemperature.
  • 1996
  • Absence of glaciation in Illinois during marine isotope stages 3 through 5
  • C 14 dating ; Climatic variation ; Geochronology ; Grain size distribution ; Illinois ; Interglacial ; Isotope analysis ; Lithostratigraphy ; Palaeosol ; Quaternary ; Stratigraphic correlation ; United States of America
  • 1996
  • Australia ; Carrying capacity ; Drainage network ; Grain size distribution ; Isotope analysis ; New South Wales ; Sediment budget ; Soil erosion ; Tracer ; Watershed
  • This paper demonstrates the use of radium-isotope ratios to trace sediment in a catchment with a uniform granite lithology. Radionuclide concentrations in transported sediment are measured spatially and temporally, and the likely effects of particle
  • 1996
  • Charge en suspension ; Erosion des sols ; Expérimentation ; Géochimie ; Isotope ; Limon ; Pente de versant ; Porosité ; Propriétés du sol ; Ruissellement ; Simulation de pluie ; Sol
  • Experimentation ; Geochemistry ; Isotope ; Loam ; Porosity ; Rainfall simulation ; Rill wash ; Slope gradient ; Soil ; Soil erosion ; Soil properties ; Suspended load
  • 1996
  • Bassin-versant ; England ; Fluviatile ; Géochimie ; Isotope ; Plaine d'inondation ; Royaume-Uni ; Sédimentation ; Taux de sédimentation ; Traceur ; Utilisation agricole du sol ; Utilisation du sol
  • Agricultural land use ; England ; Floodplain ; Fluvial processes ; Geochemistry ; Isotope ; Land use ; Sedimentation ; Sedimentation rate ; Tracer ; United Kingdom ; Watershed
  • 1996
  • A middle Pleistocene (isotope stage 10) glacial sequence in the Stikine River valley, British Columbia
  • 1996
  • Absolute dating ; Aminostratigraphy ; Bibliography ; C 14 dating ; Dating ; Glacial features ; Isotope dating ; Palaeo-environment ; Palaeomagnetism ; Palaeosol ; Quaternary ; Thermoluminescence
  • 1996
  • Aerial photography ; Coastal environment ; Coral reef ; Dating ; Geomorphological mapping ; Isotope dating ; Marine terrace ; Sea level ; Somalia ; Uranium
  • 1996
  • Dating ; Devon ; Floodplain ; Great Britain ; Isotope analysis ; Model ; Sediment budget ; Suspended load ; United Kingdom ; Watershed
  • 1996
  • Bassin-versant ; Bilan sédimentaire ; Devon ; England ; Erosion des sols ; Géochimie ; Isotope ; Plaine d'inondation ; Royaume-Uni ; Traceur
  • Devon ; England ; Floodplain ; Geochemistry ; Isotope ; Sediment budget ; Soil erosion ; Tracer ; United Kingdom ; Watershed
  • 1996
  • Alaska ; Applied ecology ; Arctic Region ; Carbon dioxide ; Cold area ; Ecosystem ; Extractive industry ; Geochemistry ; Human impact ; Impact study ; Isotope analysis ; Landscape ; Model ; Quantitative ecology ; Tundra ; Vegetation ; Water cycle
  • 1996
  • Arid area ; Australia ; Erosion rate ; Geographical information system ; Grassland ; Isotope analysis ; Karst ; Plant cover ; Risk ; Scrub ; Sediment budget ; Soil erosion ; Western Australia ; Wind erosion
  • 1996
  • This study reconstructs climate variability on the Yucatan Peninsula during the late Holocene (last 3310 C 14 yr) by measuring oxygen isotopes of ostracod and gastropod shells from sediments of Lake Punta Laguna, Quintana Roo. The paleoclimate
  • 1996
  • to a change in the isotopic compositions of the oceans.
  • 1996
  • Deglaciation ; Geochronology ; Indian Ocean ; Isotope analysis ; Marine quaternary ; Meltwater ; Oxygen 18 ; Reef ; Sea level
  • 1996