variations of surface circulation, coastal upwelling, and paleoproductivity in the northern Benguela Current System for the last 150,000 yr.
Three sediment cores on a transect across the continental slope off Namibia at about 23°S were investigated for alkenone-derived past sea-surface temperature (SST) and total organic carbon (TOC) content. These records are used to reconstruct
An offshore eddy in the California current system Part II: Surface manifestation in An offshore eddy in the California current system.
Les AA. analysent les relations entre les processus tourbillonnaires sous-marins et la signature infrarouge de surface observables sur les images de satellite. Cette manifestation de surface résulte apparemment du réajustement géostrophique de la
This study presents results on sedimentation fluxes obtained during deployments of a tripod equipped with sediment traps and instruments for measuring wave and current parameters in each of two environments (Løgstør Broad and Amstrup Bay), dominated
On the surface circulation in some channels of the Canadian Arctic Archipelago
Arctique ; Canada ; Canadian archipelago ; Courant de surface ; Courant marin ; Géographie physique
This paper advances an explanation for the presence of surfacecurrents in opposite directions on facing sides of some of the main channels of the Canadian Arctic Archipelago. It is found that geostrophic dynamics coupled with geometrical
constraints and the general direction of surface drift through the archipelago can readily account for the existence, if not all the properties, of the observed flow patterns.
Long-term and current tendencies in land-use : case study of the Prague's environs and the Czech Sudetenland
Forêt ; Praha ; Sudety ; Surface cultivée ; Tchèque, république ; Terre arable ; Utilisation agricole du sol ; Utilisation du sol ; Čechý
Agricultural land use ; Arable land ; Bohemia ; Cultivated surface ; Czech Republic ; Forest ; Land use ; Prague ; Sudety
The main results of long-term analysis of land-use, of environmental and recreation potential of Prague's environs. In the same way were investigated the regions of Rachov, Domažlice and other parts of the western Bohemia borderland. For the current
Coastal current ; Coastal environment ; European part of Russia ; Kaliningrad ; Marine sedimentation ; Sediment transport
within convergence zones of the energetic currents, and by longshore gradient currents resulting from the water surface denivelations due to wave transformations over the sea floor elevations. - (L'Ed.).
place in heads of bights. Several stable lithodynamic cells have been identified; exchange of energy and sediments between them is hampered. The sediment transport within each cell is effected by longshore energetic currents, rip currents developing
Action anthropique ; Bibliographie ; Changement global ; Effet de serre ; Impact ; Modèle ; Niveau marin ; Réchauffement climatique ; Température de surface ; Variation climatique
Bibliography ; Climatic variation ; Climatic warming ; Global change ; Greenhouse effect ; Human impact ; Impact ; Model ; Sea level ; Surface temperature
This progress report on global warming will focus on : the outcome of the Kyoto conference and its significance for future global climate change, and the current state of the global climate system, in particular the surface air temperature record
and its interpretation. The A. will also consider recent work that has a bearing on just how significant current and future global climate warming may be for the planet and for the life which inhabits it.
A geochemical and paleontological reconstruction of paleoproductivity, upwelling intensity and sea surface temperature (SST) off central Chile at 35°S reveals marked changes from the Last Glacial Maximum (LGM) through the Early Holocene. The AA
. discuss their observations in the context of the Southern Westerlies and the subtropical high-pressure belt, the main forcing for paleoproductivity changes in the southern part of the Peru-Chile Current.
at eroding bedrock. The AA. examine this issue further by compiling extreme tidal streams around the UK and from them estimate shear stresses, representing a macro-tidal environment where peak surfacecurrents reach 9-7 knots. Those data are compared
The AA. examine multibeam sonar datasets from areas of extreme tidal currents to see if there is any evidence for erosion of bedrock. A dataset of shear stresses beneath typically strong tidal currents is developed and compared with a dataset
for bedrock-eroding rivers. In the Minas Passage (Bay of Fundy), Canada, the Bristol Channel off Nash point, UK, and in the Straits of Messina, Italy, sonar data are collected and discussed. Holocene tidal currents have apparently been generally ineffective
Eroded soils : current state and predicted changes
Bilan d'érosion ; Erosion des sols ; Ex-URSS ; Prévision ; Surface cultivée ; URSS d'Europe
Cultivated land;Cultivated surface ; Erosion balance;Erosion budget ; European part of USSR ; Ex-USSR ; Forecast;Prediction ; Soil erosion
prochaines années la surface occupée par les sols érodés augmentera de 5-6 %, cependant que la production des sols moyennement érodés augmentera de 1,5 à 2 fois. Dans une perspective plus éloignée, les rythmes de l'accroissement de la surface occupée par les
La mesure des courants de surface repose généralement sur des techniques lagrangiennes utilisant des dériveurs de surface. Une variation de cette approche consiste à estimer le déplacemented traceurs visibles sur des images satellitaires AVHRR de
NOAA consécutives. Dans cet article, on présente le développement d'une méthode opérationnelle servant à estimer le courant de surface à l'aide de séries d'images de température de surface de lamer et d'une combinaison des techniques de transformée de
Arizona ; Canyon ; Coastal dynamics ; Current ; Erosion ; Fluvial processes ; Hydraulic works ; Hydrodynamics ; Model ; Sediment transport ; United States
The purpose of this paper is to evaluate the relative importance of surface-gravity waves on sandbar stability in Grand Canyon, in contrast to unidirectional currents that are the primary focus of most fluvial studies. A second objective
A study of the nature and incidence of density currents in a shallow glacial lake
, température de l'eau, bilan sédimentaire. Les courants de densité et de turbidité. Existence de courants subsuperficiels comme de courants de surface.
On the response of ocean currents to atmospheric cooling
En pénétrant dans une région plus fraîche, un courant océanique voit sa trajectoire déviée, parfois d'une centaine de kilomètres, sur sa droite (pour les eaux de surface) et sur sa gauche (pour les eaux plus profondes). Application au Gulf Stream au
Correlated millennial-scale changes in surface hydrography and terrigenous sediment yield inferred from Last-Glacial marine deposits off northeastern Brazil
To explore the paleoclimatic role of the NBC, (North Brazil Current), the AA. studied a sediment core from the upper continental slope off northeastern Brazil. They used radiocarbon dating and oxygen isotope data for age control. Variations