Adamello seen from Orobica bivuoac at Presanella (close-up, October 1st 1989)
November 1, 2007
Fabrezza-Saviore-BS, Italy
Permafrost and Periglacial Processes
Volume 15, Issue 3 , Pages 243 - 259
Special Issue: The Nature and Dynamics of Mountain Permafrost: Papers from the PACE21 Contribution to the International Permafrost Association, July 2003 . Issue Edited by C. Harris.
Published Online: 2 Sep 2004
Copyright © 2004 John Wiley & Sons, Ltd.
Research Article
Distribution and behaviour of rock glaciers in the Adamello-Presanella Massif (Italian Alps)
Carlo Baroni 1 *, Alberto Carton 2, Roberto Seppi 2
1Dipartimento di Scienze della Terra, Università di Pisa and CNR, Istituto di Geoscienze e Georisorse, Via S. Maria, 53, I-56126 Pisa, Italy2Dipartimento di Scienze della Terra, Università di Pavia, Via Ferrata, 1, I-27100 Pavia, Italy
email: Carlo Baroni (baroni@dst.unipi.it)
*Correspondence to Carlo Baroni, Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, I-56126, Pisa, Italy.
Keywords
rock glacier inventory • GIS • Holocene • Little Ice Age • Central Alps
Abstract
An inventory of rock glaciers in the Adamello-Presanella Group is presented. The distribution, behaviour and morphological characteristics of rock glaciers are described and organized in a GIS. Furthermore, we analyse the relationship between rock glaciers and vegetation and tentatively discuss that between rock glacier distribution and climatic parameters. A total of 216 rock glaciers have been identified: 41% (n = 88) are active/inactive (sensu Barsch) and the rest are relict. There is a difference of about 430 m in elevation between the fronts of active/inactive forms and those of relict forms. In the group of active/inactive rock glaciers, 59 are considered active and some of these are certainly in motion, as confirmed by two topographic surveys. At least 30 rock glaciers have developed since the Little Ice Age. The mean elevation of the fronts of active rock glaciers (2527 m) lies well below the estimated altitude of isotherms -1°C (2740 m) and -2°C (2910 m), suggesting that the reconstructed MAAT of -1/-2°C does not coincide with local MAAT in the entire group or that the studied rock glaciers are in disequilibrium with respect to current climatic conditions in the area. In conclusion, we must be cautious in using the regional MAAT for identifying active forms and in utilizing the position of rock glacier fronts for reconstructing the regional MAAT. Copyright © 2004 John Wiley & Sons, Ltd.
Received: 6 January 2004; Revised: 7 May 2004; Accepted: 29 June 2004
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