Alps (The) ; Creep ; Glacier dynamics ; Mountain ; Research technique ; Rock glacier ; Switzerland
In this contribution, an approach to measure mass balance and transport within rock glacier fronts is presented. The technique is applied to Gruben and Suvretta rock glaciers, Swiss Alps. The results confirm a conveyor belt-like advance mechanism
Avancée du glacier ; Fluctuation du glacier ; Glacier ; Karakoram ; Montagne ; Pakistan ; Siècle 20
Variations that took place at the terminus of some Karakorum glaciers (particularly the Baltoro Glacier and the Liligo Glacier) during the 20th century have been reconstructed using several methodologies. The two glaciers studied have shown
different behaviour at the termini, at least regarding the rate of variations. The Baltoro is one of the longest glaciers on the Earth : though characterized by phases of expansion (1913-1929, 1954-1987, 1990-1997) and of contraction (1929-1954, 1987-1990
), the position of the terminus has moved over time with reduced variations compared to the dimensions of the overall glacier. The Liligo is a small and transversal glacier, already flowing into the Baltoro glacier, and it is characterised by phases of great
Atlantique Nord ; Avancée du glacier ; Bilan de masse ; Circulation atmosphérique ; Dynamique de l'atmosphère ; Europe ; Fluctuation du glacier ; Glacier ; Interaction océan-atmosphère ; Oscillation climatique ; Scandinavie ; Variation saisonnière
Mountain glaciers in Scandinavia are currently advancing while most of the monitored mountain glaciers of the world are retreating. The AA. examine how the mass balance of glaciers in Scandinavia are correlated with atmospheric variability
Fluctuations of outlet and valley glaciers in the Southern Andes (Argentina) during the past 13,000 years
Andes ; Argentina ; C 14 dating ; Climatic variation ; Glacial features ; Glacieradvance ; Holocene ; Lateglacial ; Palaeo-environment
Andes ; Argentine ; Avancée du glacier ; Datation C 14 ; Glaciaire ; Holocène ; Paléo-environnement ; Tardiglaciaire ; Variation climatique
In the southern Argentine Andes, ten advances of valleys glaciers were used to reconstruct the late-glacial and Holocene glacier history. The accumulation areas of these glaciers lie in the Precordillera and are thus independent of fluctuations
of the South Patagonian Icefield (SPI). This paper discusses the number, age, and extent of these valley glacieradvances during the late-glacial and postglacial intervals.
Cosmogenic radionuclide evidence for the limited extent of last glacial maximum glaciers in the Tanggula Shan of the central Tibetan Plateau
China ; Glaciation ; Glacier ; Glacieradvance ; Isotope dating ; Moraine ; Palaeoclimatology ; Quaternary ; Tibet
Avancée du glacier ; Chine ; Datation isotopique ; Glaciation ; Glacier ; Moraine ; Paléoclimatologie ; Quaternaire ; Tibet
Cosmogenic radionuclide (CRN) exposure ages provide evidence for the limited extent of last glacial maximum glaciers in the Tanggula Shan, central Tibetan Plateau. The most extensive advances occurred during or before marine oxygen isotope stage 6
(MIS-6) based on previous CRN exposure ages. The second most extensive advance occurred during or before MIS-4 based on previous ages and new ages.
Ablation glaciaire ; Avancée du glacier ; Dynamique glaciaire ; Eau de fonte ; Glacier ; Glaciologie ; Variabilité interannuelle
The aim of this article is to review the characteristics and causes of temporal variations in the horizontal and vertical motion of glaciers at less than annual time intervals. These variations have been identified from measurements made both
At Galena Creek, the ice/debris system has alternated between rock glacier and debris-covered glacier modes due to changes in the size of the accumulation area. These results have important implications for paleoclimatic studies of the ice
Climate cooling and glacieradvance during the late Holocene are discussed with case studies from the Causasus, Pamiro-Alai, Tien Shan, Altai, Sayan, Polar Urals, mountains of Yakutia, and Kamtchatka. Palynological and geomorphological data yield
Surface elevation change and high resolution surface velocities for advancing outlets of Jostedalsbreen
Aerial photography ; Digital elevation model ; Geographical information system ; Glacier ; Glacieradvance ; Glacier dynamics ; Norway ; Photogrammetry
Avancée du glacier ; Dynamique glaciaire ; Glacier ; Modèle numérique de terrain ; Norvège ; Photogrammétrie ; Photographie aérienne ; Système d'information géographique
Velocity fields for the 3 outlet glaciers Nigardsbreen, Bergsetbreen and Baklibreen of Jostedalsbreen, southern Norway, have been obtained from successive orthophotos by digital image processing. The orthophotos were generated with standard digital
The glacial extent and glacial advance/retreat asynchroncity in East Asia during Last Glaciation
Asia ; China ; Eastern Asia ; Glaciation ; Glacieradvance ; Glacier fluctuation ; Global change ; Monsoon ; Palaeogeography ; Pleistocene ; Quaternary
Asie ; Asie de l'Est ; Avancée du glacier ; Changement global ; Chine ; Fluctuation du glacier ; Glaciation ; Mousson ; Paléogéographie ; Pléistocène ; Quaternaire
exhibits regional differences. The study validates the reasonableness of the asynchronous advance theory, and ascertains that both the synchronous and asynchronous advance/retreat of glaciers existed from 30 ka BP to 10 ka BP.
Hemisphere ice sheets maximum and changes in oceanic circulation that predominately control global climate. In research areas, 3 seasonal precipitation patterns control the accumulation and ablation of glaciers. It can be concluded that glacier development
Owing to increased winter balances especially since 1988/89, almost all valley outlet glaciers of Jostedalsbreen in western Norway are experiencing the largest advance since that of the early 18th century, the regional Little Ice Age maximum
. Observations made along the glacier front suggest that the formation of these moraines can best be described as bulldozed moraines. Large boulders left in the proglacial areas are pushed forward, forming pressure ridges on the distal side. Some of the largest
boulders are overturned or rotated by the glacier.
Based on a review of observations on different types of calving glaciers, a simple calving model is proposed. Advance or retreat of the calving front is not driven by changes in the calving rate, but by flow-induced changes in the geometry
of the terminal region. This model is essentially different from prior suggestions in which some empirical relation - most commonly the water-depth model - is used to calculate calving rate and the rate of retreat or advance of the terminus.
A glacieradvance in Western Greenland - documentation of a prograding ice front near Søndre Strømfjord
Coastal environment ; Cold area ; Glacial erosion ; Glacial features ; Glacier ; Glacieradvance ; Glacier front ; Greenland ; Moraine ; Sedimentation
Avancée du glacier ; Erosion glaciaire ; Front glaciaire ; Glaciaire ; Glacier ; Groenland ; Littoral ; Moraine ; Sédimentation ; Zone froide
by the advancing Piedmont Glaciers of the Alpine Foreland. - (L'A.).
After attaining a maximum extension at the turn of the century, the Inland Ice has retreated continuously in Middle West Greenland within the last decades. Since a couple of years, however, there are strong indications of a new advance
... The prograding glaciers in West Greenland may be comparable with the ice margins of Europe in early phases of the maximum glaciation of the last Ice Age. Some of the actuogeological observations are of interest concerning sediments (Vorstoschotter) generated
Recent glacieradvances in Norway and New Zealand : a comparison of their glaciological and meteorological causes
Atmospheric circulation ; El Niño ; Glacier ; Glacieradvance ; Glacier mass balance ; Holocene ; New Zealand ; Norway ; Ocean atmosphere interaction
Avancée du glacier ; Bilan de masse ; Circulation atmosphérique ; El Niño ; Glacier ; Holocène ; Interaction océan-atmosphère ; Norvège ; Nouvelle-Zélande
Norway and New Zealand both experienced recent glacial advances, commencing in the early 1980s and ceasing around 2000, which were more exensive than any other since the end of the Little Ice Age. Common to both countries, the positive glacier
Alaska ; Avancée du glacier ; Datation C 14 ; Dendrochronologie ; Fluctuation du glacier ; Glacier ; Géochronologie ; Géographie historique ; Holocène ; Moraine
This paper examines the very recent rapid changes, surges, and presents a summary of Bering Glacier's activity during the Holocene. A perspective on the Holocene history of the Bering Glacier is presented as a backdrop for understanding
The intent of this work is to : 1) present surface velocities on 15 rock glaciers averaged over 12 years (1983-1995) in the Selwyn Mountains; 2) calculate long-term velocities using rock glacier length and lichen age; 3) compare the velocities
Variations of italian glaciers between 1980 and 1999 inferred by the data supplied by the Italian Glaciological Committee
Années 1980 ; Années 1990 ; Fluctuation du glacier ; Glacier ; Italie ; Mesure de terrain ; Recul du glacier
Glacier ; Glacier fluctuation ; Glacier retreat ; Ground survey ; Italy ; Years 1980-89 ; Years 1990-99
century were characterized by a phase of general retreat of the glaciers, that followed an advancement phase that took place in the 70s and in the early 80s. The data matrix, which is largely incomplete, includes 335 glaciers. - (NF)
The study synthesises the analysis of those data relevant to the variation registred in the Italian glaciers during glaciological surveys carried out by the Italian Glaciological Committee between 1980 and 1999. The last twenty years of the 20th
Tephrochronology of Late Wisconsin deglaciation and Holocene glacier fluctuations near Glacier Peak, North Cascade Range, Washington
Déglaciation ; Etats-Unis ; Fluctuation glaciaire ; Glaciation ; Glacier Peak ; Glacier alpin ; Gphy ; Géographie de l'Amérique ; Holocène ; Montagne ; North Cascade Range ; Pléistocène supérieur ; Quaternaire zones moyennes ; Téphrochronologie
Tephra layers near Glacier Peak in the North Cascade Range provide limiting dates for four periods of alpine glacieradvance. Field relations suggest that late Wisconsin alpine glaciers last advanced prior to the eruption of tephra layers from
Glacier Peak about 11.250 yr B.P. Late Wisconsin deglaciation in the central North Cascades was complete prior to the Glacier Peak tephra eruptions. Glaciers again expanded in the early Holocene about 8400-8300 yr B.P. Soil formed in alpine meadows during
an episode of mild climate in the middle Holocene prior to at least two intervals of glacier expansion: an older episode between 5100 and 3400 yr B.P., and a younger episode within the last 1000 yr.
behavior of the Taku and Le Conte glaciers locates in southeast Alaska. The AA. propose that these asynchronous advances and retreats reflect changes in iceberg calving rates with time.
Observations of fjord glaciers along the coast of Alaska indicate that their detailed fluctuations may have little or no direct relation to climate. In this paper the AA. further examine this question by focusing on the asynchronous Late-Holocene
Dendroglaciological dating of a little ice age glacial advance at moving glacier, Vancouver Island, British Columbia
British Columbia ; Canada ; Dating ; Dendrochronology ; Glacier ; Glacieradvance ; Island ; Little ice age ; Palaeo-environment ; Vancouver
Avancée du glacier ; British Columbia ; Canada ; Datation ; Dendrochronologie ; Glacier ; Ile ; Paléo-environnement ; Petit âge glaciaire ; Vancouver
Datation dendrochronologique de l'avancée du glacier Moving au Petit Âge glaciaire, dans l'île de Vancouver. Après la période d'expansion, qui a permis au glacier d'atteindre sa limite maximale après 1818 ap. J.-C., le glacier a connu un recul