![]() ![]() A gap remains, even though it is covered by several floating chronologies from France and Switzerland. Nevertheless the breakthrough to a continuous absolute chronology back to Boelling (GI-1e) has not yet been achieved. The regional chronologies of Central Europe may provide improved interconnection to other terrestrial or marine high-resolution archives. They agree well with the characteristics of Boelling/Alleroed (GI-1) and the transition into Younger Dryas (GS-1). High frequency signals and long-term fluctuations are revealed by the ring-width data sets of the newly constructed Swiss Late-glacial Master Chronology (SWILM) as well as the Central European Lateglacial Master Chronology (CELM) spanning 1606 years. Geographical expansion of cross-matched European Lateglacial chronologies, limits and prospects of teleconnection between remote sites and extension of the absolute tree-ring chronology are discussed. Here we present the entire range of Lateglacial tree-ring chronologies from Switzerland, Germany, France, covering the Lateglacial north and west of the Alps without interruption as well as finds from northern Italy, complemented by a 14C data set of the Swiss chronologies. Map of the different site areas and sites in Southern and Central Europe: In Switzerland we differ two areas: Winterthur with the Dättnau site, while Zurich area comprehends various find sites: Birmensdorf, Wiedikon, Landikon Dorf (Kaiser, 1993) as well as Gänziloh and Landikon of the construction sites of Uetliberg tunnel (Schaub, 2007, Schaub et al.,2008a).In Germany all sites of Danube and tributaries as well as the sites in Eastern Germany are pooled (Friedrich et al., 2001aFriedrich et al.,, 2004).In France: Only the main sites Drouzet and Barbiers are displayed, while scattered finds in the Durance River valley and tributaries are neglected ( Sivan and Miramont, 2008 Miramont et al., 2000a,b).In Northern Italy both areas as of Turin (Avigliana, Carmagnola, Palughetto) and Revine appear (Friedrich et al., 1999Friedrich et al.,, 2001aFriedrich et al., ,b, 2004). Kaiser (1993) had developed four floating chronologies including pines from theFig. The rich yield of trees resulted in another Swiss chronology dating into of early YD and chronology ZHLG1 covering 1420 yrs of entire Alleroed (GI-1c-a) and the transition into YD (GS-1). BP, a reduction in erosion rate that may have been favoured by a more extensively wooded landscape. BP, which is comparable to present rates measured on denudated marls in the Southern French Alps, under a probably climate-driven erosion regime, and (2) 17 to 20 t/ha/yr since 14,500 cal. Annual specific erosion rates on marly slopes are estimated at: (1) 98 to 111 t/ha/yr for the period 20,000–14,500 cal. 8 million m3 of sediments have thus been exported out of the Charanc catchment since 14,500 cal. At the present time, 46% of this volume (6 million m3) is still stored in the catchment. 73% of the material eroded over the last 14,500 years (14 million m3) was stored in fan-shaped deposits. BP, the overall morphogenetic regime has been one of vertical incision. BP, footslopes were buried by fan-shaped deposits at a rate of 6700 m3/yr. A change to a sedimentation regime commenced at around 14,500 cal. BP, sediment that was eroded (37 million m3) within the Charanc catchment was entirely exported. Estimations of specific hillslope erosion, sedimentation and export rates highlight the evolution of the catchment and its sensitivity to variations in the ratio of sediment load to stream discharge. We computed three palaeosurfaces by masking the Digital Elevation Model of the current topography, and calculated the sediment budget of the catchment. All datasets were integrated into a Geographic Information System. Ten 14C ages of sub-fossil trees and charcoal beds were compiled. Following field surveys, a high-resolution morphometric map was established. Abstract Changes in sediment budget and quantification of sediment fluxes of a small (5.3 km2) Mediterranean sub-Alpine river catchment (Charanc catchment, Southern French Alps, 44☃0′44N/5★1′55E) are estimated for the last 20,000 years using a GIS-based approach and 3D palaeotopographic reconstructions. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |