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Maussion, Fabien; Butenko, Anton; Champollion, Nicolas; Dusch, Matthias; Eis, Julia; Fourteau, Kévin; Gregor, Philipp; Jarosch, Alexander H.; Landmann, Johannes; Oesterle, Felix; Recinos, Beatriz; Rothenpieler, Timo; Vlug, Anouk; Wild, Christian T.; Marzeion, Ben

The Open Global Glacier Model (OGGM) v1.1

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  • Medientyp: E-Artikel
  • Titel: The Open Global Glacier Model (OGGM) v1.1
  • Beteiligte: Maussion, Fabien; Butenko, Anton; Champollion, Nicolas; Dusch, Matthias; Eis, Julia; Fourteau, Kévin; Gregor, Philipp; Jarosch, Alexander H.; Landmann, Johannes; Oesterle, Felix; Recinos, Beatriz; Rothenpieler, Timo; Vlug, Anouk; Wild, Christian T.; Marzeion, Ben
  • Erschienen: Copernicus GmbH, 2019
  • Erschienen in: Geoscientific Model Development, 12 (2019) 3, Seite 909-931
  • Sprache: Englisch
  • DOI: 10.5194/gmd-12-909-2019
  • ISSN: 1991-9603
  • Entstehung:
  • Anmerkungen:
  • Beschreibung: Abstract. Despite their importance for sea-level rise, seasonal water availability, andas a source of geohazards, mountain glaciers are one of the few remainingsubsystems of the global climate system for which no globally applicable,open source, community-driven model exists. Here we present the Open GlobalGlacier Model (OGGM), developed to provide a modular and open-sourcenumerical model framework for simulating past and future change of anyglacier in the world. The modeling chain comprises data downloading tools(glacier outlines, topography, climate, validation data), a preprocessingmodule, a mass-balance model, a distributed ice thickness estimation model,and an ice-flow model. The monthly mass balance is obtained from griddedclimate data and a temperature index melt model. To our knowledge, OGGM isthe first global model to explicitly simulate glacier dynamics: the modelrelies on the shallow-ice approximation to compute the depth-integrated fluxof ice along multiple connected flow lines. In this paper, we describe andillustrate each processing step by applying the model to a selection ofglaciers before running global simulations under idealized climate forcings.Even without an in-depth calibration, the model shows very realisticbehavior. We are able to reproduce earlier estimates of global glacier volumeby varying the ice dynamical parameters within a range of plausible values.At the same time, the increased complexity of OGGM compared to otherprevalent global glacier models comes at a reasonable computational cost:several dozen glaciers can be simulated on a personal computer, whereasglobal simulations realized in a supercomputing environment take up to a fewhours per century. Thanks to the modular framework, modules of variouscomplexity can be added to the code base, which allows for new kinds of modelintercomparison studies in a controlled environment. Future developments willadd new physical processes to the model as well as automated calibrationtools. Extensions or alternative parameterizations can be easily added by thecommunity thanks to comprehensive documentation. OGGM spans a wide range ofapplications, from ice–climate interaction studies at millennial timescalesto estimates of the contribution of glaciers to past and future sea-levelchange. It has the potential to become a self-sustained community-drivenmodel for global and regional glacier evolution.
  • Zugangsstatus: Freier Zugang