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The Cryosphere An interactive open-access journal of the European Geosciences Union
© Author(s) 2015. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
12 Jan 2015
Review status
This discussion paper has been under review for the journal The Cryosphere (TC). The revised manuscript was not accepted.
A sensitivity study of fast outlet glaciers to short timescale cyclical perturbations
E. Aykutlug and T. K. Dupont Department of Earth System Science, University of California Irvine, 3200 Croul Hall, Irvine, CA 92697-3100, USA
Abstract. The dynamic response of outlet glaciers on short (annual to decadal) timescales is affected by various external forcings, such as basal or oceanic conditions. Understanding the sensitivity of the dynamic response to such forcings can help assess more accurate ice volume projections. In this work, we investigate the spatiotemporal sensitivity of outlet glaciers to fast cyclical forcings using a one-dimensional depth and width-averaged heuristic model. Our results indicate that even on such short timescales, nonlinearities in ice dynamics may lead to an asymmetric response, despite the forcing functions being symmetric around each reference value. Results also show that such short-timescale effects become more pronounced as glaciers become closer to flotation. While being qualitatively similar for both downsloping and upsloping bed geometries, the results indicate higher sensitivity for upsloping ("West Antarctica-like") beds. The range in asymmetric response for different configurations motivate parameterizing or including short-timescale effects in models while investigating the dynamic behavior of outlet glaciers.

Citation: Aykutlug, E. and K. Dupont, T.: A sensitivity study of fast outlet glaciers to short timescale cyclical perturbations, The Cryosphere Discuss., 9, 223-250, doi:10.5194/tcd-9-223-2015, 2015.
E. Aykutlug and T. K. Dupont
E. Aykutlug and T. K. Dupont


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