Late-glacial and Holocene glacier fluctuations and environmental change on South Georgia, Southern Ocean
This paper combines a study of glacier fluctuations and palaeoecological changes to determine the environmental history of South Georgia since the last glacial maximum. The most extensive Holocene advance of South Georgia glaciers culminated just
before 2 200 yr B.P. The Holocene temperature changes of between 0.5 and 1.0o C are comparable in scale and timing to those identified from recent analyses of Vostok ice cores from the Antarctic ice sheet.
Evidence of climatic change in Antarctica over the last 30 000 years from the Dome C ice core in Sea level ice and climatic change.
Un forage de 906 m couvrant 30 000 ans a été effectué sur le site du Dome C. Les variations observées dans la composition isotopique de la glace, la taille des cristaux et autres paramètres sont expliqués par les changements climatiques.
The model is driven by sea-level change over the last 40,000 yr in association with assumed changes in the rate of melting beneath ice shelves. Ice growth and decay are characterized by thresholds which separate periods of steady state from periods
of rapid transition. Tests show that ice sheet behavior is most sensitive to sea-level change, basal marine melting and accumulation and is less sensitive to isostasy, spatial variation in accumulation, calving rates, and ice flow parameterization.
L'A. traite de la réaction de la couche de glace antarctique à l'effet de serre et présente une projection expérimentale des changements du niveau global de la mer dans les quelques prochains siècles, dus aux changements d'équilibre de sa masse
Analyse pétrologique de la glace des coins de glace afin de déterminer les changements d'orientation d'axes dans les coins, en fonction de la croissance de ceux-ci. Les changements sont liés à la recristallisation et à la croissance des grains
Originalité de langue et de culture des Esquimaux Polaires, mais l'immigration importante des Groenlandais occidentaux a entraîné des changements dans leur culture matérielle, leurs conditions sociales et leur religion.
The nature of sea-level changes and the circulation of water in the Arctic Ocean are briefly outlined. Seasonal changes in sea level are simulated with a two-dimensional nonlinear model for the water and a nonlinear model of the ice drift affected
Variations in valley glaciers activity in the Transantarctic Mountains as indicated by associated flow bands in the Ross Ice Shelf in Sea level ice and climatic change.
Climatic changes in Antarctica during the last 30,000 years in Evolution des atmosphères planétaires et climatologie de la terre=Evolution of planetary atmospheres and climatology of the earth.
The AA. describe here late Quaternary paleoclimate, ice-volume change, and dynamics of the Ross ice drainage system using data from a powerful combination of drift sheets and ice cores.
The AA. discuss the vegetation record obtained from fossil pollen and wood, a possible history of sediment deposition, and the sequence of environmental change that is implied. Finally, they consider the chronology of this site, and of others