Modelling the effect of topography on ice sheet erosion, Scotland
Glacial erosion ; Ice ; Inland ice ; Model ; Quaternary ; Scotland ; Temperature ; Topography ; United Kingdom
The aim of this paper is to use the spatial variation in ice sheet erosion under former Scottish ice sheets to test the hypothesis that basal thermal regime is the crucial factor determining the ability of an ice sheet to erode its bed. The study
The object of this study is a 3029 m long deep ice core drilled in 1990-1992 by the European Greenland Ice-Core Project (GRIP). This core reaches nearly to bedrock and reaches back to 250,000 yr B.P., according to dating based partly
on stratigraphic methods and partly on ice-flow modeling. Discussion of the climatic fluctuations suggested by the Eemian deposits in the GRIP core.
Hypertemporal analysis of remotely sensed sea-ice data for climate change studies
Air temperature ; Arctic Region ; Climatic variation ; Remote sensing ; Research technique ; Satellite imagery ; Sea ice ; Temperature
Climatologists have speculated that a spatially coherent pattern of high-latitude temperature trends could be an early indicator of climatic change. The sensitivity of sea ice to the temperature of the overlying air suggests the possibility
that trends in Artic ice conditions may be useful proxy indicators of general climatic changes. In particular, analyses of passive microwave imagery can provide us with daily information on sea-ice extent, type, concentration, dynamics and melt onset.
Based on records from both Antarctic Ice Free Areas and Ice Cores, a brief discussion concerning the assumed disaster in the coming 50-100 years is given in this paper.
Durant l'été austral 1994-95, un programme extensif de mesures glaciologiques, géophysiques et géodétiques a été mené le long d'une ligne d'écoulement du Foundation Ice Stream. Les données collectives servent de base à la détermination du flux de
masse dans la zone d'influence du courant glaciaire dans le Ronne Ice Shelf. Les AA. présentent les données et les premiers résultats. - (DR)
Glacial-geological/geomorphological research in West Greenland used to test an ice-sheet model
C 14 dating ; Deglaciation ; Geochronology ; Glacial features ; Greenland ; Ice sheet ; Model ; Moraine ; Sea level ; Topography
Ice sheet modeling is an essential tool for estimating the effect of climate change on the Greenland ice sheet. A geological scenario of ice margin positions since the last glacial maximum is based on a review of existing literature and new datings
An oxygen-isotope paleothermometer from ice in siberian permafrost
Air temperature ; Cold area ; Geochemistry ; Ground ice ; Methodology ; Oxygen 18 ; Palaeoclimatology ; Palaeogeography ; Palaeotemperature ; Permafrost ; Precipitation ; Russia ; Siberia ; Snow
The AA. propose to use oxygen isotope composition (δ18O) of ground ice (ice cement, as well as segregated ice) for reconstruction of cold-season paleotemperature (Tc) in permafrost areas. The term cold season refers to the period when precipitation
Ice flow vectors on the debris-mantled Tasman Glacier, 1957-1986
This paper examines the debris-mantled zone of Tasman Glacier for evidence of debris mantle formation. Particularly, the velocity distribution and surface morphology are studied to understand the extent and rate of ice stagnation and the process
Do Greenland ice cores reflect NW European interglacial climate variations?
Air temperature ; Climatic variation ; Europe ; Greenland ; Ice core ; Interglacial ; Oxygen 18 ; Palaeotemperature ; Quaternary ; Surface water
The climatic evolution during the Eemian and the Holocene in western Europe is compared with the sea-surface conditions in the Norwegian Sea and with the oxygen-isotope-derived paleotemperature signal in the GRIP and Renland ice cores from Greenland
Numerical modeling of the late Weichselian Svalbard-Barents Sea ice sheet
Arctic Region ; Barents Sea ; Climatic variation ; Geochronology ; Glaciology ; Ice sheet ; Isostasy ; Model ; Numerical model ; Quaternary ; Svalbard
This paper uses a time-dependent glaciological model to produce numerical reconstructions of the late Weichselian Svalbard-Barents Sea Ice Sheet, taking account of recent geological, biological, and chronostratigraphic evidence of climatic change
The geochemical paradox of ice-complex sediments in North Siberia
Asian part of Russia ; Cold area ; Freeze-thaw cycle ; Freezing ; Frost action ; Geochemistry ; Ice ; Palaeo-environment ; Salt ; Siberia ; Weathering
Des dépôts limoneux avec de la glace, présents en Sibérie septentrionale, sont appelés ici complexe de sédiments et de glace (ICS). Ils ont une teneur en sels plus élevée que les autres dépôts continentaux d'âge Néogène-Pléistocène. Ces différences
résultent sans doute de changements de phase dans les inclusions formées de gaz et de liquides présentes dans les cristaux et les roches. Les AA. concluent que ces dépôts ICS se seraient formés sous des conditions moins humides et plus froides que celles qui
The AA. use loess grain-size records derived from the Chinese Loess Plateau as a proxy indicator of the East Asian winter monsoon, and compare the winter monsoon record with global ice volume changes at both time and frequency domains. The possible
dynamic linkage between the variations in the winter monsoon circulation and global ice volume is addressed.
Reflection of Scandinavian Ice Sheet fluctuations in Norwegian Sea sediments during the past 150,000 years
Arctic Region ; C 14 dating ; Geochronology ; Glacier fluctuation ; Ice sheet ; Marine sediment ; Norwegian Sea ; Oxygen 18 ; Palaeomagnetism ; Quaternary ; Stratigraphic correlation
This paper correlates the continental record of glacier fluctuations in western Scandinavia with marine sediment records from the Vøring Plateau area in the Norwegian Sea, which was adjacent to the western flank of the Scandinavian Ice Sheet
. The input of ice-rafted detritus (IRD) into the ocean is used as a monitor of glacier fluctuations and, thus, for the calibration of a glaciation curve. There is a close similarity between the glaciation curve constructed from continental records and the IRD
Ice-wedge formation in Northern Asia during the Holocene
Asian part of Russia ; Baikal ; C 14 dating ; Holocene ; Ice wedge ; Isotope analysis ; Oxygen 18 ; Palaeotemperature ; Periglacial features ; Quaternary ; Sakha ; Siberia ; Stratigraphy
Imja glacier dead-ice melt rates and changes in a supra-glacial lake, 1989-1994, Khumbu Himal, Nepal: danger of lake drainage
Imja glacier lake has rapidly expanded in area as glacial ice on the east side has melted. If this melt rate continues, collapse of a terminal moraine could cause a devastating outburst flood. AA recommend immediate action to lower the lake level
The margin of the last Barents-Kara ice sheet at Markhida, northern Russia
Arctic Region ; C 14 dating ; European part of Russia ; Glacial features ; Ice sheet ; Lacustrine sediment ; Meltwater ; Moraine ; Periglacial features ; Permafrost ; Quaternary
Hypsometric forcing of stagnant ice margins: Pleistocene valley glaciers, San Juan Mountains, Colorado
The A. uses the location of stagnant ice deposits in many San Juan valleys, Colorado, to test how valley hypsometry and topographic obstructions influence the type of margin present during valley glacier retreat.