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00925njm 22002777a 4500 dc Robinson, Alexander James author Álvarez Solas, Jorge author Montoya Redondo, María Luisa author Goelzer, Heiko author Greve, Ralf author Ritz, Catherine author 2020-06-24 We describe the physics and features of the icesheet model Yelmo, an open-source project intended for collaborative development. Yelmo is a thermomechanical model, solving for the coupled velocity and temperature solutions of an ice sheet simultaneously. The ice dynamics are currently treated via a “hybrid” approach combining the shallow-ice and shallow-shelf/shelfy-stream approximations, which makes Yelmo an apt choice for studying a wide variety of problems. Yelmo’s main innovations lie in its flexible and user-friendly infrastructure, which promotes portability and facilitates long-term development. In particular, all physics subroutines have been designed to be self-contained, so that they can be easily ported from Yelmo to other models, or easily replaced by improved or alternate methods in the future. Furthermore, hard-coded model choices are eschewed, replaced instead with convenient parameter options that allow the model to be adapted easily to different contexts. We show results for different ice-sheet benchmark tests, and we illustrate Yelmo’s performance for the Antarctic ice sheet. 1991-959X 10.5194/gmd-13-2805-2020 https://hdl.handle.net/20.500.14352/6529 http://dx.doi.org/10.5194/gmd-13-2805-2020 https://gmd.copernicus.org/ Description and validation of the ice-sheet model Yelmo (version 1.0)