Thursday, 15 July 2010
Image BBC http://www.bbc.co.uk/news/10333304
Thursday, 15 April 2010
Friday, 26 March 2010
Thursday, 17 December 2009
Tuesday, 3 November 2009
Image and content from: Thompson, L. G., Brechera, H. H., Mosley-Thompson, E., Hardyd, D. R. and Mark, B. G. (2009).
Glacier loss on Kilimanjaro continues unabated. Proceedings of the National Academy of Sciences of the United States of America (Early Edition), 1-6. Available online at http://tiny.cc/Miub0.
Friday, 23 October 2009
Thursday, 12 March 2009
Tuesday, 10 February 2009
Thursday, 22 January 2009
Wednesday, 31 December 2008
In the study, glaciologists determined the total volume of ice in Swiss glaciers at 74 cubic kilometres in 1999. This was determined partly by direct measurement and partly by modeling. This figure is thought to have been reduced by 13% between 1999 and the present day. There is less concern about the medium term fate of the larger glaciers such as the Aletsch (see photo) as these contain 80% of all the ice in the Swiss glaciers. Of greater concern is the short term fate of small glaciers - many of these are unlikely to survive more than a few years. Aside from the obvious impacts on landscape and tourism, many Swiss glaciers play an important role in water supply and the generation of hydro-electric power.
Tuesday, 17 June 2008
- Why and when does explosive cracking occur?
- Are hard intact rocks damaged only by frost?
- How can episodic rockfalls or rock avalanches associated with permafrost degradation be predicted?
- What are the rates of and controls on ice segregation and bedrock heave in permafrost regions?
- What was the role of frost weathering in the evolution of mid-latitude Quaternary periglacial lowlands?
- How and to what extent does frost weathering contribute to long-term erosion of cold mountains?
The authors suggest that answers will be found with the help of new techniques (eg rock sensors to detect fluid and ice presence, 3D microtopography scanning) as well as multi-technique approaches. They also recommend particular attention be paid to distinguishing both temporal and spatial scales. The image shows frost shattered bedrock in Norway, and the development of incipient ground.
Matsuoka, N. and Murton, J. (2008). Frost weathering: Recent adavnces and future directions. Permafrost and Periglacial Processes 19, 195-210.
Thursday, 22 May 2008
Tuesday, 20 May 2008
André, M-F., Hall, K., Bertran, P. and Arocena, J. (2008). Stone runs in the Falkland Islands: Periglacial or tropical? Geomorphology 95(3-4), 524-543.