Global ETD Search

1	Glacier sensitivity along the Andes: implication for paleoclimatic reconstructions of the Little Ice Age Sagredo, Esteban A. 16 October 2012 (has links) No description available. Geology Andes Andean glaciers climate change glacier sensitivity equilibrium line altitude Little Ice Age`
2	Dendroclimatological Investigations Of Sea Buckthorn (Hippophae Rhamnoides) And Reconstruction Of The Equilibrium Line Altitude Of The July First Glacier In The Western Qilian Mountains, Northwestern China Xiao, Shengchun, Xiao, Honglang, Kobayashi, Osamu, Liu, Puxing 06 1900 (has links) Radial growth characteristics of a high-elevation shrub species, sea buckthorn (Hippophae rhamnoides), were investigated at four sites in a river valley at altitudes ranging from 3,333 to 3,820 m a.s.l. close to the terminus of the July First Glacier in the western Qilian Mountains of northwestern China. Radial growth of the sea buckthorn was significantly and positively correlated with the mean monthly temperature in June of the current growing season. Based on the fact that fluctuations in the shrub’s radial growth and the glacier’s equilibrium-line altitude (ELA) are affected by climatic variables, a tree-ring width chronology of the four sites was used to reconstruct the ELA from 1950 to 2003. The resulting ELA model explained more than 55.3% of the variance in the ELA of the July First Glacier series. On a decadal time scale, the cumulative-departure curve of the reconstructed ELA series showed an increasing trend from the 1950s to the mid-1960s, followed by a descending trend from the mid-1960s to the mid-1970s. The ELA appears to have remained stable from the mid-1970s to the mid-1990s, but has displayed dramatic variations during the past decade. Dendrochronology Tree Rings Dendroglaciology July First Glacier Equilibrium Line Altitude (ELA) Hippophae Rhamnoides Shrub Growth Tree-Ring Analysis
3	Late glacial (Younger Dryas) glaciers and ice-sheet deglaciation in the Cairngorm Mountains, Scotland : glacier reconstructions and their palaeoclimatic implications Standell, Matthew R. January 2014 (has links) The Cairngorm Mountains contain an outstanding assemblage of glacial landforms from both the deglaciation of the last British Irish Ice Sheet and the Younger Dryas readvance. Glaciers are recognised as sensitive indicators of past and present climate change and, thus, these landforms provide information about past climate and glacier-climate interaction that can be used to contextualise the present climate change. Previous interpretations have left doubt over the extent and style of the Younger Dryas readvance. In addition, the pattern and timing of deglaciation in the southern Cairngorms and, particularly, how local and external ice masses interacted is unclear. New geomorphological mapping from aerial images and fieldwork has been compiled in a GIS for a 600km2 area of the Cairngorm Mountains. This has allowed a complex pattern of ice-dammed lakes and local and regionally sourced ice margins to be reconstructed during the retreat of the last British Irish Ice Sheet. The mapping has been combined with new cosmogenic surface exposure ages taken from areas of hummocky moraine previously subject to differing age interpretations. The effect of moraine denudation on apparent 10Be ages has been checked by inverse modelling of the 10Be concentration vs. boulder height. The results indicate more extensive Younger Dryas glaciation, with glacier reconstructions and equilibrium-line altitudes (ELAs) comparable with the surrounding areas. Reconstruction of both valley and plateau-fed glaciers are presented, with modelling of local topoclimatic factors, such as radiation, avalanche and snow drifting, combined with precipitation gradients, explaining most of the variation within the glacier ELAs. The geomorphological evidence and palaeoclimatic inferences are important, alongside a growing number of palaeoglaciological studies, in acting as evaluation areas for current numerical models of ice-sheet growth and decay. 551.31
4	Zur pedologischen Relativdatierung glazialgeomorphologischer Befunde aus dem Dhaulagiri- und Annapurna-Himalaja im Einzugsgebiet des Kali Gandaki (Zentral-Nepal) / Pedological relative dating of glaciogeomorphological features from the Dhaulagiri and Annapurna Himalaya along the catchment of the Kali Gandaki (central Nepal) Wagner, Markus 07 February 2007 (has links) No description available. 550 Geowissenschaften Mathematics and Computer Science Nepal Himalaja Kali Gandaki Annapurna Dhaulagiri Quartär Klimawandel relative Datierung Geomorphologie Schneegrenze Gletscher Vergletscherung Boden Pedochronologie Bodenverwitterung Himalaya quaternary climate change relative dating geomorphology equilibrium line glacier glaciation soil pedochronology soil weathering 38.09 QGM 113: Nepal {Geographie}

1

Page generated in 0.0764 seconds