Suretta Sud Glacier - Servizio Glaciologico Lombardo
Suretta Sud Glacier - Servizio Glaciologico Lombardo
Suretta Sud Glacier - Servizio Glaciologico Lombardo
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Tab. 9: The front variations of the sample glaciers since 1990: the dynamic phase is expressed by the<br />
algebraic sign.<br />
Year<br />
Number<br />
of measured<br />
glaciers<br />
Withdrawing glaciers Stable glaciers Advancing glacier<br />
number % number % number %<br />
1990 40 35 87,5 2 5,0 3 7,5<br />
1991 26 23 88,5 2 7,7 1 3,8<br />
1992 35 33 94,4 1 2,8 1 2,8<br />
1993 36 32 88,8 2 5,6 2 5,6<br />
1994 47 39 83,0 5 10,6 3 6,4<br />
1995 44 38 86,4 4 9,1 2 4,5<br />
1996 52 48 92,3 1 1,9 3 5,8<br />
1997 55 37 67,3 1 1,8 17 30,9<br />
1998 61 53 86,9 2 3,3 6 9,8<br />
1999 57 47 82,5 6 10,5 4 7,0<br />
2000 57 53 93,0 2 3,5 2 3,5<br />
2001 24 14 58,3 2 8,4 8 33,3<br />
2002 53 42 79,2 0 0 11 20,8<br />
2003 62 56 90,4 3 4,8 3 4,8<br />
2004 49 42 85,7 1 2,1 6 12,2<br />
2005 57 53 93,0 3 5,3 1 1,7<br />
2006 33 32 97 1 3 0 0<br />
2007 30 29 96,7 0 0 1 3,3<br />
2008 28 27 96,4 1 3,6 0 0<br />
Tab. 10: The synthetic indexes used in order to define the annual dynamic phase of Lombardy glaciers.<br />
Dynamic index Description<br />
S (Stable) meaningful morphologic variation versus the previous survey. Extensive snow cover.<br />
IL (Slight increment) snow cover over most of the glacier: slight increment of firn versus the previous year.<br />
IM (Moderate increment) snow cover over the whole glacier; terminus shows some advancement.<br />
IF (Strong increment)<br />
snow cover over the whole glacier and surrounding areas; significant snout advancement.<br />
DL (Slight decrement) Scarce snow cover, slight terminus retreat; or stable front but slightly reduced thickness.<br />
DM (Moderate decrement)<br />
DF (Strong decrement)<br />
Very scarce or absent snow cover, verified terminus retreat; thickness and area reduction.<br />
No snow cover, strong terminus retreat, or stable front but reduction of both thickness<br />
and area.<br />
I (Uncertain) the dynamic phase is doubtful (uncertain data, debris cover and so on…)<br />
E (Extinct) / EC (Extinct<br />
confirmation)<br />
Extinct during the current year / already extinct in the previous years<br />
- 35 -<br />
2008 glaciological<br />
Survey