Little Ice Age and contemporary glacier extent in the Western and South-Western Piedmont Alps (North-Western Italy)

摘要

Glaciers are widely recognized as the best terrestrial indicators of climate change. Nevertheless, changes that have occurred since the end of the Little Ice Age (LIA) are often poorly understood. In Italy, glacier front variations in the last 100 years have been well documented, thanks to the efforts of the Italian Glaciological Committee (Comitato Glaciologico Italiano, CGI), which coordinates annual surveys on all glaciers, since 1927, in order to measure their front positions. However, although front variations are the easiest measurements to take in the field, they only partially describe changes that occur on the entire glacial mass. Moreover, the last national glacier inventory dates back to 1957–1958, which was promoted by the CGI on the occasion of the International Geophysical Year. Authors of the present work herein provide an updated inventory of present-day (2006) glaciers in the Western and South-Western Piedmont Alps (situated in the provinces of Turin and Cuneo). Along with the present-day glacial outlines, the map also includes a reconstruction of the extent of the glaciers during the Little Ice Age, inferred from morphological features such as LIA and post-LIA moraine ridges as well as the aid of historical archive data. Some basic glacier morphometric parameters (surface, length, width, mean slope, highest and lowest altitude, exposure) were computed for the two specified time periods (LIA and 2006). This study was carried out under the framework of the project ‘GlaRiskAlp – Glacial Risks in Western Alps’, project n.° 56 under the 2007–2013 ALCoTra programs.