Variations of the Ice Margins in East Antarctica

摘要: Since THE last century, glaciers over most of the earth have been shrinking. A mass evidence his trend has collected by Ahlmann in comprehensive survey glacier variations,1 while other writers, too numerous to mention, brought forward proof recent recessions Europe, North and South America, Africa, Asia, New Zealand, Arctic regions. about 1940-50, however, there are signs that recession become less general Northern Hemisphere is some temperature rise culminated 1940.* Glacial widespread throughout Sub-arctic, examples reported from Alaska, Canada, Iceland, Jan Mayen, Spitsbergen, Franz Josef Land, Novaya Zemlya, Norway, outflow Greenland ice cap. It would seem reasonable, then, consider possibility corresponding process Antarctica and, indeed, reports 3 give im? pression was occurring west 1940. Further retreat at Heard Island made several members A.N.A.R.E. (Australian National Antarctic Research Expeditions). Against this, how? ever, Schytt4 able state no appreciable thinning had occurred Dronning Maud Land for many years prior 1950. In these circumstances writer, working Mawson with during International Geophysical Year, approached question margin variations east an open mind. The studies this field were divided into two broad categories: attempt show whether or not fluctuations margins past century so, a search changes on larger time scale, i.e. post-Pleistocene variations. These will be considered turn.