The study has estimated the reduction of the glaciers of Mt Antelao (Dolomites, Italy) from the LittleIceAge (LIA) to today using bibliographic and morphological data as well as modern techniques of data elaboration and processing. - (NF)
by 6 radiocarbon age estimates on woody fragments and peat. On the basis of this information a pattern of enhanced fan development and vegetation change coincident with the climatic deterioration of the LittleIceAge can be established.
This paper reports a preliminary investigation of the sedimentary succession in 2 alluvial fans in western Norway. Sedimentological information is supplemented by palaeoecological data from pollen analysis and the age of the sequence is constrained
Reconstruction of LittleIceAge events in the canadian Rocky Mountains
Canada ; Datation ; Dendrochronologie ; Glaciaire ; Géographie de l'Amérique ; Lichenométrie ; Montagne ; Moraine ; Petit Age Glaciaire ; Radiocarbone ; Rocky Mountains
Principales techniques utilisées pour la datation des moraines du Petit Age Glaciaire et reconstitution des phases d'avancée glaciaire sur 33 glaciers.
The extensive occurrence of glacier ice cores to landforms and deposits of the Neoglacial and LittleIceAge periods in the St Elias Mountains of the Southwest Yukon is described.
oscillations corresponding with climatic changes are found in this diagram. Three periods of a relatively rapid growth of prices can be distinguished which correspond with three cooling waves during LittleIceAge.
Elevational shifts of Coleogyne ramossissima in the Mojjave Desert during the LittleIceAge
California ; Climatic variation ; Desert ; Littleiceage ; Nevada ; Palaeo-ecology ; Palaeogeography ; Precipitation ; United States of America ; Vegetation
In this paper, the AA. add to the knowledge of vegetation changes in the Mojave desert during the LittleIceAge through study of fossil woodrat middens located in the eastern part of the desert where substantially greater amounts of precipitation
to other links sediment and historical records in Mesoamerica, they conclude that climate became drier on the Yucatan Peninsula near the start of the LittleIceAge, LIA.
The retreat of 293 glaciers in the Tien Shan Mountains from their maximum extent during the LittleIceAge (LIA) is estimated using aerial photographs from 1980 to 1985 and maps at a scale of 1:25 000, constructed during period 1956-1990. Two
indices of changes are used : the linear distance from the glacier terminus to its LittleIceAge moraine and the difference in absolute elevation of the terminus and the moraine. Historical information about the front positions of glaciers in the 1880s
to the 1930s was used as an indirect control of remote sensing data. The age of moraines in key regions was estimated by lichenometry.
Lichenometric dating of littleIceAge glacier activity in the central British Columbia Coast Mountains, Canada
British Columbia ; Canada ; Dating ; Glacial features ; Glacier fluctuation ; Lichenometry ; Littleiceage ; Mountain ; Palaeo-environment
The LittleIceAge behaviour of glaciers in the central British Columbia Coast Mountains was described by conducting lichenometric surveys of Rhizocarpon spp. found on recently deposited moraines in the Kitimat and Pacific ranges. The timing
of these moraine-building episodes corresponds closely to the intervals of glacier expansion recorded in complementary studies in the region. These findings indicate that most glaciers in the region reached their maximum downvalley LittleIceAge extent prior
Effects of the LittleIceAge on avalanche boulder tongues in the French Alps (Massif des Ecrins)
Alpes du Sud ; Avalanche ; France ; Glacial features ; Hautes-Alpes ; Lichenometry ; Littleiceage ; Palaeo-ecology ; Palaeo-environment
Lichens of the subspecies Rhizocarpon geographicum were measured on 25 avalanches boulder tongues in the Massif des Ecrins to elucidate the LittleIceAge history of avalanche activity. According to the results, the avalanche activity
was at a maximum before AD 1650 and between AD 1730 and 1830. The relatively good correspondence between avalanche boulder tongue and glacier behaviour in the Massif des Ecrins to climatic variation which occurred since the LittleIceAge confirms that avalanche
This review focuses on the development of the LittleIceAge as a glaciological and climatic concept, and evaluates its current usefulness in the light of new data on the glacier and climatic variations of the last millennium and of the Holocene
. It is concluded that the concept of a LittleIceAge will remain useful only by : continuing to incorporate the temporal and spatial complexities of glacier and climatic variations as they become better known; reflecting improved understanding of the Earth
Glacier behaviour and the influence of upper-air conditions during the LittleIceAge in Disko, central West Greenland
Circulation atmosphérique ; Glacier ; Glaciologie ; Groenland ; Géographie des régions polaires ; Petit Age Glaciaire ; Retrait glaciaire ; Vent
L'inventaire de 205 glaciers et névés au SW de Disko montre des différences importantes dans la récession glaciaire depuis la fin du Petit Age Glaciaire.
Enhanced rockfall activity during LittleIceAge : further lichenometric evidence from a Norvegian talus
Dating ; Holocene ; Lichenometry ; Littleiceage ; Model ; Norway ; Rockfall ; Slope
Dans cet article, les AA. testent l'hypothèse suivant laquelle, les conditions climatiques du Petit Age Glaciaire dans le sud de la Norvège, ont eu pour résultat une fréquence des chutes de roches beaucoup plus élevée. La méthode consiste à mesurer
The extent of some glaciers in Northern Iceland during the littleiceage and the nature of recent deglaciation
Datation ; Déglaciation actuelle ; Glacier ; Géographie de l'Europe ; Islande ; Lichénométrie ; Petit Age Glaciaire ; Siècles 19-20 ; Variation climatique ; Variation glaciaire ; Zone froide
Lichenometric studies from four glaciers in Northern Iceland are used to determine the dates of their LittleIceAge maxima. In all cases these date to the last half of the nineteenth century and probably marked the maximum Neoglacial extent
Re-dating the moraines at Skálafellsjökull and Heinabergsjökull using different lichenometric methods : implications for the timing of the Icelandic LittleIceAge maximum
During 2003, 12 000 lichens were measured on 40 moraine fragments of both glaciers to provide surface age proxies. The results reveal that the choice of lichen dating curve has a significant impact on the estimated timing of LittleIceAge (LIA
) maxima. An early to mid-19th century LIA maximum at both glaciers, as determined in this study, accords well with other emerging evidence (Icelandic geochronology reconstructions, sea-ice and NAO records). This indicates that the often-cited late 19th
Ice-core pollen record of climatic changes in the central Andes during the last 400 yr
Andes ; Bolivia ; Central America ; Climatic variation ; Littleiceage ; Mountain ; Palynology ; Peru ; Pollen diagram
and supports the scenario that the LittleIceAge (LIA) consisted of 2 distinct phases, a wet period and a dry period. The striking similarity between the Sajama and Quelccaya proxy records suggests that climatic changes during the LittleIceAge occurred
This paper presents a high-resolution ice-core pollen record from the Sajama Ice Cap, Bolivia, that spans the last 400 yr. The pollen record corroborates the oxygen isotopic and ice accumulation records from the Quelccaya Ice Cap in southern Peru
Sediment release and storage in early deglaciated areas : towards an application of the exhaustion model from the case of Massif des Ecrins (French Alps) since the LittleIceAge
Alps (The) ; Deglaciation ; France ; Glacier ; Littleiceage ; Paraglacial ; Sediment budget ; Sediment transfer