Open Access

Table 4

Average winter and summer isotopic composition of rainfall on the MBM and the CM at elevations comparable to the samples collected during our fieldwork (site waterisotopes.org). Isotopic composition of the meteoric waters collected on the MBM and the CM.

Composition isotopique moyenne des précipitations (site waterisotopes.org), en hiver et en été, sur le MBM et le CM à des altitudes comparables à celles des échantillons prélevés lors de notre campagne de terrain. Composition isotopique des eaux météoriques recueillies sur le MBM et le CM.

A Position (WGS 84)

sample Lat Long alt m δ2H‰ δ18O ‰ Sample type
EMB3 45°96’90.91’’ 6°87’03.02’’ 1200 -33 -4,9 Puddle (rain same day)
EMB1 45°89’35.76’’ 6°89’58.59’’ 2178 -121,2 -15,5 Snow pack water
EMB4 46°90'43.42’’ 6°86'10.8’’ 2270 -101,1 -13,1 Swamp water
EMB2 45°96′90.91’’ 6°87′03.02’’ 2300 -105,3 -13,3 Snow pack
EMB05 45°87'93.04’’ 7°12'33.55’’ 3804 -101,1 -12,9 Snow day of sampling
EM06 45°89'08.32’’ 6°88'98.55’’ 3759 -144,3 -18 Snow from glacier
Mean -115,4 -14,56
15,5 1,752

MBM Winter (October to March) Summer (April to September)


Alt [m] 2H Mean 18O Mean D Mean 18O Mean


1200 -88.2 -12.28 -40.85 -6.24
2178 -103.8 -14.42 -52,42 -7,91
2270 -105.6 -14.64 -53,42 -8,08
2300 -105.6 -14.64 -54 -8,14
3759 -129.2 -17.84 -71,14 -10,62
3804 -130.2 -17.94 -71,85 -10,68
Mean -110.44 -12.85 -57.28 -8.62

B Position (WGS 84)

Sample Lat Long alt m δ2H‰ δ18O ‰ sample type

Rocher Perdrix 44°51'15.95’’ 6°42'40.28’’ 2360 -118,4 -15,9 snow after snowfall
Rocher Aigle 44°54'24.03’’ 6°44'28.86’’ 2460 -93 -11,9 snow after snowfall
Soureou 44°54'17.03’’ 6°44'40.68’’ 2520 -108,1 -14,4 snow after snowfall
Gondran 44°54'37.00’’ 6°43'30.74’’ 2160 -97,7 -13,5 lake water
Col Vert 44°54’17.35’’ 6°45'05.73’’ 2270 -102.6 -14,1 snow
Col Vert 44°54’16.66’’ 6°45°04.25’’ 2520 -102,4 -12,8 snow
Lac Chausse 44°54’42.87’’ 6°44’14.30’’ 2287 -102 -13,7 lake water
Lac Saraille 44°54’17.35’’ 6°45°05.73’’ 2236 -99,7 -13,7 lake water
Sar. stream 44°54’17.35’’ 6°45'05.73’’ 2236 -106 -14,5 stream water
Chenaillet 44°54’08.47’’ 6°44'26.70’’ 2600 -101 -13,4 snow after snowfall
Chenaillet 44°54'08.50’’ 6°44'26.75’’ 2650 -83 -11,8 snow after snowfall
Mean -101,3 -13,6
5,8 0,84

CM Winter (October to March) Summer (April to September)


2H 18O 2H 18O

2160 -95,6 -13.38 -46,14 -7.14
2236 -96,6 -13,56 -47,14 -7,28
2270 -97,2 -13,62 -47,28 -7,31
2287 -97,4 -13,66 -47.42 -7,35
2360 -98,4 -13.82 -48,42 -7.47
2460 -100 -14,04 -49,71 -7,64
2520 -101 -14,14 -50,42 -7,74
2520 -101 -14,14 -50,42 -7,74
2600 -102,4 -14,34 -51,28 -7,87
2650 -103 -14,44 -52,14 -7,97
Mean -89.42 -13.81 -49.04 -7.55

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