Swiss glaciers 1850–2100

Glacier d'Otemma N

IceIce lost since 1850This glacier

Past extents come from the Swiss Glacier Inventories of 1850, 1931, 1973 and 2016. Future extents are illustrative: each glacier’s projected area (OGGM, median of CMIP6 climate models) is removed from its lowest ice upward. About the scenarios.

Inventory 0.278km² Area in 2016 · ±0% compared with 2016
Area 20160.28km²375th largest
Elevation2,869–3,769mmedian 3,348 m
Length1.9kmfaces east
1850 ice body16.4km²now 7 glaciers
Thinning 1983–2023−25maverage surface lowering
Ice left in 21000%of 2020 volume, SSP2-4.5

Glacier d'Otemma N is one of 1,400 glaciers in Switzerland, covering 0.28 km² in the canton of Valais. Its ice spans 2,869 to 3,769 m and faces east. Its meltwater drains to the Rhône and on to the Mediterranean. In 1850 it was part of a larger ice body of 16.4 km², which has since split into 7 glaciers covering 9.5 km² in 2016 (−42%). Between 1983 and 2023 its surface dropped by 25 m on average. With strong climate protection (SSP1-2.6), about 16% of its 2020 ice would remain in 2100. With very high emissions (SSP5-8.5) it would be gone around 2070. Its meltwater peaked around 2020.

Future

What remains in 2100

SSP1-2.6 · low emissions16%32% left in 2050
SSP2-4.5 · intermediate emissionsGoneIce gone around 2096
SSP3-7.0 · high emissionsGoneIce gone around 2081
SSP5-8.5 · very high emissionsGoneIce gone around 2070
SSP1-2.6SSP2-4.5SSP3-7.0SSP5-8.5
0%25%50%75%100%2020204020602080210016%0%0%0%
Ice volume as a share of 2020, median of 14 climate models; shaded: middle two-thirds of models. OGGM v1.6.

Meltwater

Million m³ of water per year, 11-year mean

00.20.40.60.81.020102030205020702090
Water leaving the glacier area each year: ice melt, snowmelt and rain. It rises while the glacier melts faster, then falls as the ice runs out: “peak water”.
Measured

The record

Thinning since 1983

Average change in surface height, from comparing elevation models made from maps, aerial images and laser scans.

−30 m−20 m−10 m0 m1990200020102020−25 m
GLAMOS Swiss Glacier Volume Change, release 2025.
Profile

Facts

Area over time

185016.392 km²19310.339 km²19730.314 km²20160.278 km²2050 · SSP2-4.50.100 km²2100 · SSP2-4.50.011 km²

Past areas are the ice body this glacier belonged to at the time. Projections: OGGM median, SSP2-4.5.

SGI id
B73-33
Canton
Valais
River
Rhône → Mediterranean
Basin
Hérens & Nendaz
Location
45.9880° N, 7.4710° E · swisstopo map
Elevation
2,869–3,769 m, median 3,348 m
Slope, aspect
26°, east
Debris cover
0.00 km² (0% of the area)
Inventory image
2016
Ice volume (model)
≈ 0.006 km³ in 2020 (OGGM)
RGI ids
RGI60-11.02802
In 1850 joined with
Glacier des Bouquetins zentral, Pointe Barnes, Haut Glacier d'Arolla, Bas Glacier d'Arolla, Glacier des Bouquetins N, Glacier des Bouquentins S
Nearby

More in the Hérens & Nendaz basin

All glaciers in this basin →

Sources

Sources

  1. Linsbauer et al. (2021). The new Swiss Glacier Inventory SGI2016. Frontiers in Earth Science 9. doi.org/10.3389/feart.2021.704189
  2. Mannerfelt et al. (2022). Halving of Swiss glacier volume since 1931 observed from terrestrial image photogrammetry. The Cryosphere 16. doi.org/10.5194/tc-16-3249-2022
  3. GLAMOS – Glacier Monitoring Switzerland. www.glamos.ch
  4. Zekollari et al. (2024). Twenty-first century global glacier evolution under CMIP6 scenarios and the role of glacier-specific observations. The Cryosphere 18 (OGGM v1.6 projections). tc.copernicus.org/articles/18/5045/2024/

Relief: swisstopo swissALTIRegio. 1850 and 1973 outlines: Maisch et al. (2000), Müller et al. (1976), Paul (2004). Length, mass balance and volume change: GLAMOS releases 2025. All sources and methods.

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