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A new model for global glacier change and sea-level rise
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Luft-, vatten och landskapslära. (Glaciologi)
ETH Zurich.
2015 (engelsk)Inngår i: frontiers in earth science, Vol. 3, s. 1-22, artikkel-id 54Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The anticipated retreat of glaciers around the globe will pose far-reaching challenges to the management of fresh water resources and significantly contribute to sea-level rise within the coming decades. Here, we present a new model for calculating the twenty-first century mass changes of all glaciers on Earth outside the ice sheets. The Global Glacier Evolution Model (GloGEM) includes mass loss due to frontal ablation at marine-terminating glacier fronts and accounts for glacier advance/retreat and surface elevation changes. Simulations are driven with monthly near-surface air temperature and precipitation from 14 Global Circulation Models forced by RCP2.6, RCP4.5, and RCP8.5 emission scenarios. Depending on the scenario, the model yields a global glacier volume loss of 25–48% between 2010 and 2100. For calculating glacier contribution to sea-level rise, we account for ice located below sea-level presently displacing ocean water. This effect reduces the glacier contribution by 11–14%, so that our model predicts a sea-level equivalent (multi-model mean ±1 standard deviation) of 79±24 mm (RCP2.6), 108±28 mm (RCP4.5), and 157±31 mm (RCP8.5). Mass losses by frontal ablation account for 10% of total ablation globally, and up to ∼30% regionally. Regional equilibrium line altitudes are projected to rise by ∼100–800 m until 2100, but the effect on ice wastage depends on initial glacier hypsometries.

sted, utgiver, år, opplag, sider
2015. Vol. 3, s. 1-22, artikkel-id 54
HSV kategori
Forskningsprogram
Geovetenskap med inriktning mot naturgeografi
Identifikatorer
URN: urn:nbn:se:uu:diva-270216DOI: doi.org/10.3389/feart.2015.00054OAI: oai:DiVA.org:uu-270216DiVA, id: diva2:888144
Tilgjengelig fra: 2015-12-22 Laget: 2015-12-22 Sist oppdatert: 2018-01-10

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