HR: 1340h
AN: GC13A-0936 [Abstracts]
TI: Glacier fluctuations during the last 400 years at Mount San Lorenzo and Santa Ines Island, southern Chile
AU: * Aravena, J
EM: jaravena@uwo.ca
AF: Centro de Estudios del Cuaternario de Fuego Patagonia y Antartica (CEQUA), Avenida
Bulnes 01890, Punta Arenas, 113-D, Chile
AU: * Aravena, J
EM: jaravena@uwo.ca
AF: Department of Geography,University of Western Ontario, 1151 Richmmond Street, London,
ON N6A 5C2, Canada
AU: Luckman, B H
EM: luckman@uwo.ca
AF: Department of Geography,University of Western Ontario, 1151 Richmmond Street, London,
ON N6A 5C2, Canada
AB:
We examine the local glacier fluctuations for the last 400 years in two mountain areas of the western coast of
southernmost South America, Mount San Lorenzo and Santa Ines Island, using dendroglaciologic,
geomorphologic and historical evidence. Mount San Lorenzo moraines span between 1636 and 1927 with
periods of more frequent occurrence of glacial advances for the years 1670, 1770, 1870 and 1910. Santa Ines
glacial advances are less numerous than in Mount San Lorenzo with well defined, clearly separated frontal
moraines. The moraines were colonized by Nothofagus betuloides and Nothofagus antarctica two species with
clear and well-preserved tree rings and the total age of the sampled trees was more precisely estimated. Dated
moraines cover the last 300 years with evidence for advances during late 1600s, around 1800, 1860, 1910, 1930
and 1960. Further work is needed in dendroglaciological dating, geomorphologic surveying, and better
understanding of local glacial dynamics for several glaciers to obtain a regional history of the glacier fluctuations
of the southern Andes.
DE: 1600 GLOBAL CHANGE
DE: 1637 Regional climate change
DE: 1699 General or miscellaneous
SC: Global Environmental Change [GC]
MN: 2007 Fall Meeting