Ross ice shelf oxygen isotopes and West Antarctic climate history
Antarctique ; Barrière de Ross ; Carotte de glace ; Glace ; Géographie des régions polaires ; Isotopes de l'oxygène ; Paléoclimatologie ; Quaternaire supérieur ; Ross Ice Shelf
The Ross Ice Shelf oxygen isotopic profile at station J-9 covers at least the last 30,000 yr.
Rel'efoobrazujuscaja dejatel'nost'sel'fovyh lednikov Rossa i Mak-Merdo, Antarktida. (L'activité morphogénique des glaciers de shelf Ross et McMurdo dans l'Antarctique)
Clorophyll and nitrate fine structure in the southeastern Bering Sea shelf break front
Chlorophylle ; Front de bord de plate-forme ; Front océanique ; Géographie physique ; Hydrologie marine ; Mer de Bering ; Nitrate ; Pacifique, îles ; Shelf break front
The flooding of the Maltese shelf during the Holocene deposited transgressive sand and gravel directly over Tertiary carbonates. Post-transgressive carbonate sedimentation is controlled by the distal location of the shelf within non-tropical
and oligotrophic nutrient conditions that allow moderate to low carbonate production along most of the shelf area down to >50 m water depth. The geographical variations in the content of metastable carbonates within biogenic sand are related to shelf long profile
Late Wisconsinan age glacial Landforms and deposits indicate that an ice shelf of at least 60,000 km flowed northwestward into Viscount Melville Sound, probably from the M'Clintock Dome of the Laurentide Ice Sheet. The ice shelf overlapped coastal
areas and laid Winter Harbour Till up to 150 m above present sea level on the north coast of Victoria Island. The contemporary sea-level was 50 to 100 m higher than present. A maximum age of 10,340150 yr BP for the till, and thus for the ice shelf
Composition and flux of Holocene sediments on the eastern Laptev Sea shelf, Arctic Siberia
Arctic Ocean ; Asian part of Russia ; Bathymetric chart ; C 14 dating ; Climatic warming ; Continental shelf ; Holocene ; Marine sediment ; Micro-organism ; Palaeo-environment ; Sea floor ; Sedimentation rate ; Siberia
The aim of this paper is to investigate various Holocene sediment records from a high-resolution core on the inner eastern Laptev Sea Shelf. The AMS C 14 chronology of the core allows reliable calculation of shelf sediment budgets. Because
of the close land-shelf connection, the data not only provide a detailed history of depositional regime but also contain information of the general paleoenvironmental evolution in this region during the Holocene.
A computer model along a flow-line of an ice dome: captured ice shelf
The paper examines the captured ice shelf hypothesis through the construction of a numerical model. Based on ice surface elevation, ice thickness, and ground topography, the velocity is calculated. The thickness is adjusted, taking into account
Late Quaternary evolution of the northern Aegean shelf
Data used in this study consist of seismic reflection profiles and bathymetric profiles. They reveal the geological evolution of the Ierissos-Alexandroupolis shelf area of the northern Aegean during the latest sea-level rise. The islands of Thassos
Sequence stratigraphy, depositional history, and middle to late Quaternary sea levels of the Ventura shelf, California
Through analysis of high resolution seismic-reflection profiles, this paper addresses the middle to late Quaternary history of sedimentation of the Ventura shelf and associated glacioeustatic sea level fluctuations, and it constructs a chronology
The morphology, sediments and processes associated with the construction of a moraine along the western margin of the ice-shelf in George VI Sound, Antarctica, are discussed. A conceptual model of the moraine is developed and may help to explain
Buried late Quaternary fluvial channels on the Louisiana continental shelf, USA
On the subsiding shelf of Louisiana extensive systems of buried channels, corresponding to former fluvial systems, have been recognized at five different levels. Some channels are even larger than the modern Mississippi River.
Shelf sea fronts'adjustements revealed by satellite IR imagery
IR imagery from NOAA5 has been used to study the movement of shelf sea fronts. After the elimination of tidal advection, the fronts show remarkable consistency of position and do not adjust to the strong semi-monthly variation in tidal stirring
Glacial lowstand deposits on the outer continental shelf of southeastern Australia
Aminostratigraphy ; Australia ; C 14 dating ; Climatic variation ; Continental shelf ; Glaciation ; Mollusca ; New South Wales ; Quaternary ; Sea level
This paper presents new evidence for last-glacial low-stand sedimentation on the continental shelf, as determined from radiocarbon dating and amino acid racemization analyses. The results also indicate climate-induced changes in the nature