Discussion of the results of the investigations of organic matter in the SW Atlantic, in the Polar Frontal Zone. The present goal was organic matter distribution at the period of its accumulation and bacterioplankton activization anomalously warm
Forms of unusual patterned ground: examples from the Falkland Islands, SouthAtlantic
Aeolian features ; AtlanticOcean ; Earth surface processes ; Island ; Lacustrine sediment ; Patterned ground ; Peat ; Sand ; Sediment transport ; SouthAtlanticOcean
This paper descibes the characteristics of, and outlines the most likely origins for, three forms of unusual patterned ground observed in the Falkland Islands, SouthAtlantic. The features here described are not products of frost-related processes
Plate kinematic implications of Atlantic Equatorial fracture zone trends
We present a plate kinematic evolution of the SouthAtlantic which is based largely on the determination of the equatorial fracture zone trends between the African and South American continental margins. Four main opening phases are dated by oceanic
magnetic anomalies, notably MO, A34 and A13, and are correlated with volcanism and tectonic events on land around the SouthAtlanticOcean. The Ceara and Sierra Leone rises are probably of oceanic origin and were created 80m.y. ago or later in their present
-day positions with respect to South America and Africa. (The AA.).
This paper presents new Sea Surface Temperature (SST) estimates from the east-equatorial SouthAtlanticOcean and compares them with existing data for this area and the nearby African continent. Ocean Drilling Program (ODP) core 1077A-1H
Africa ; AtlanticOcean ; Atmospheric dynamics ; Climatic warming ; Holocene ; Meltwater ; Monsoon ; North AtlanticOcean ; Ocean atmosphere interaction ; Palaeoclimate ; Precipitation ; SouthAtlanticOcean ; Surface temperature ; Surface water
Afrique ; Atlantique ; Atlantique Nord ; Atlantique Sud ; Dynamique de l'atmosphère ; Eau de fonte ; Eau de surface ; Gradient thermique ; Holocène ; Interaction océan-atmosphère ; Mousson ; Paléoclimat ; Précipitation ; Réchauffement climatique
The deglacial pattern of a high-resolution alkenone-derived temperature record from the southeastern tropical Atlantic was compared with one from the northeastern subtropical Atlantic. During Termination 1b, surface waters in the eastern tropical
Atlantic (6°S) reached modern temperatures, whereas those in the subtropical northeastern Atlantic (21°N) were still considerably colder than today. This asymmetrical warming may reflect meltwater-induced reductions in the northward heat transport and helps
Prostranstvenno-vremennaja izmencivost' meridional'nogo perenosa tepla v okeanah Variabilité spatio-temporelle du transfert thermique méridien dans les océans
and the rate of change in the ocean heat content. It is found that the period of heat transport from the SouthAtlantic to the North Atlantic is nearly twice as large than in the opposite direction. In the other oceans the periods of heat transport from
The results of calculating the space-time variability of the meridional heat transport (MHT) in the Atlantic, Pacific and Indian oceans are discussed. Initial information contains data on the resultant heat flux at the ocean-atmosphere interface
the Southern Hemisphere to the Northern Hemisphere and inversely are approximately equal. A semiannual MHT harmonic is revealed. It is especially pronounced in the Indian Ocean. - (L'Ed.).
Analyse isotopique ; Antarctique océan ; Atlantique Sud ; Diatomée ; Foraminifère ; Glace de mer ; Holocène ; Néoglaciation ; Oxygène 18 ; Paléoclimatologie ; Paléogéographie ; Température de surface ; Variation climatique
The AA. studied a piston core (TTN057-13-PC4) from 53°S in the Atlantic sector of the Southern Ocean to reconstruct the Holocene history of Antarctic surface water in the SouthAtlantic. The core is suited for paleoclimatic studies because of its
high sedimentation rate in the Holocene and its position relative to strong hydrographic gradients in the subantarctic SouthAtlantic. The AA. measured multiple proxies including oxygen isotopes of diatoms and foraminifera, February sea surface
Winter Atlantic climate and snowfall in the south and central Appalachians
Appalachian Mountains ; Atmospheric circulation ; Climate oscillation ; Climatic variability ; Cyclone ; Mountain ; North AtlanticOcean ; Ocean atmosphere interaction ; Season ; Snow ; Surface temperature ; Teleconnection ; United States of America
Appalachian Mountains ; Atlantique Nord ; Circulation atmosphérique ; Cyclone ; Etats-Unis ; Etats-Unis de l'Est ; Hiver ; Interaction océan-atmosphère ; Montagne ; Neige ; Oscillation climatique ; Prévision météorologique ; Saison ; Température de
Winter snowfall over much of the south and central Appalachian region shows a significant inverse association with a winter index of the North Atlantic Oscillation (NAO) teleconnection pattern. The snowiest winters coincide with the negative phase
Disappearance of pink-pigmented Globigerinoides ruber at 120,000 yr BP in the Indian and Pacific Oceans
on the oxygen isotope stratigraphy in 11 Indo-Pacific deep-sea cores, but it continued to live on to the present in the North and SouthAtlanticOcean and the Mediterranean Sea. The disparate Atlantic and Indo-Pacific records reflect faunal provincialism
The planktonic foraminiferal species Globigerinoides ruber with pink-pigmented tests occupied a worldwide warm water belt during much of the Pleistocene. This variety was exterminated from the Indian and Pacific Oceans at about 120,000 yr BP, based
Etudes biologiques et géologiques du fond de l'océan dans l'Atlantique Sud
AtlanticOcean ; Bathymetry ; Geophysics ; Global tectonics ; Island arc ; Magnetic anomaly ; Oceanic ridge ; Plate tectonics ; Sea current ; Sea floor;Ocean floor ; SouthAtlanticOcean ; Submarine geomorphology ; Submarine valley
features of the Southern Ocean circulation―was arised. Investigation carried out during cruises of the r/v « Academic Kurchatov » (1985) and the r/v « Dmitry Mendeleev » (1989) permitted to reveal principal geomorphological properties of the South-Antillean
basin, its bordering ridges and Mid-Scotia Ridge. One more ridge of mid-oceanic type was created in eastern part of the Scotia Sea about 7 m.y. ago (Late Miocene). Some new transform faults were discovered. A new morphostructural map of South-West
AtlanticOcean and Scotia Sea was compiled. - (L'A.).
Morphostructural transformation and stages of the geological history of the Scotia Sea were studied in connection with spreading of the Mid-Scotia Ridge, which has undergone a series of evolutionary cycles during the movement of the ancient South
-American and Antarctic lithospheric plates and young Scotia plate. The opening of the Scotia Sea (South Antillean basin) had taken place at 30-31 m.y. ago; the Drake Strait―at 20-23 m.y. At the same time the Antarctic Circumpolar Current―the dominant
Plate boundary tectonics and oceanic island geomorphology in The geomorphology of plate boundaries and active continental margins.
axis (in the SouthAtlantic).
This paper illustrates how studies of the geomorphology of oceanic islands can contribute to the understanding of nearby plate boundaries. For this purpose, an oceanic island is defined as one within an ocean basin. Case studies are given of three
contrasting situations : a) islands behind a subduction zone (the Law islands behind the Tonga trench in the Pacific| b) an island oceanwards of a trench (Christmas island near the Sunda trench in the Indian Ocean| c) islands scattered each side of a spreading
Development of miniature sorted patterned ground following soil erosion in East Falkland, SouthAtlantic
and indicate that in cool oceanic climates the distribution of frost-sorted patterns is controlled by the presence of bare ground on suitable regolith rather than by altitude.
Variabilité de l'intensité et de la position du centre d'action cyclonique dans le secteur atlantique de l'Océan austral dans la seconde moitié du XXème siècle
Examen de la dynamique d'intensité et de la position du centre d'action atlantique sud de l'atmosphère. L'intensité du minimum de pression est déterminée par l'intensité du transfert zonal des masses d'air au-dessus de l'Océan austral.
. subdivide each major ocean basin, (the North Indian Ocean, the AtlanticOcean, the Northwest Pacific Ocean, the South Pacific Ocean, the South Indian Ocean, and the East-central Pacific Ocean), into several sub-basins to survey the heterogeneity of extreme
localized rainfall within the inner core region of intense TCs. Sub-basins with intense TCs that produce extreme rainfall rate maxima include the Bay of Bengal, the South Philippine Sea, the East China Sea, the north coast of Australia, southeast Melanesia
, and the Northwest Atlantic. Sub-basins with a higher proportion of category 5 (CAT5) observations than category 3 (CAT3) observations tend to have a greater P25 beyond 60 km from the storm center.
Terrigenous sediments from Ceara Rise in the western tropical AtlanticOcean record Pleistocene Amazon Basin climate variability. The AA. use the changing composition of oxides, goethite and hematite, in the terrigenous fraction of the marine record