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Toposub: a Tool for Efficient Large Area Numerical Modelling in Complex Topography at Sub-grid Scales : Volume 5, Issue 2 (02/05/2012)

By Fiddes, J.

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Book Id: WPLBN0004009339
Format Type: PDF Article :
File Size: Pages 36
Reproduction Date: 2015

Title: Toposub: a Tool for Efficient Large Area Numerical Modelling in Complex Topography at Sub-grid Scales : Volume 5, Issue 2 (02/05/2012)  
Author: Fiddes, J.
Volume: Vol. 5, Issue 2
Language: English
Subject: Science, Geoscientific, Model
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Gruber, S., & Fiddes, J. (2012). Toposub: a Tool for Efficient Large Area Numerical Modelling in Complex Topography at Sub-grid Scales : Volume 5, Issue 2 (02/05/2012). Retrieved from

Description: Glaciology, Geomorphodynamics & Geochronology, Department of Geography, University of Zurich, Switzerland. Mountain regions are highly sensitive to global climate change. However, large scale assessments of mountain environments remain problematic due to the high resolution required of model grids to capture strong lateral variability. To alleviate this, tools are required to bridge the scale gap between gridded climate datasets (climate models and re-analyses) and unresolved (by coarse grids) sub-grid mountain topography. We address this problem with a sub-grid method. It relies on sampling the most important aspects of land surface heterogeneity through a lumped scheme, allowing for the application of numerical land surface models (LSM) over large areas in mountain regions. This is achieved by including the effect of mountain topography on these processes at the sub-grid scale using a multidimensional informed sampling procedure together with a 1-D lumped model that can be driven by gridded climate datasets. This paper provides a description of this sub-grid scheme, TopoSUB, as well as assessing its performance against a distributed model. We demonstrate the ability of TopoSUB to approximate results simulated by a distributed numerical LSM at around 104 less computations. These significant gains in computing resources allow for: (1) numerical modelling of processes at fine grid resolutions over large areas; (2) extremely efficient statistical descriptions of sub-grid behaviour; (3) a sub-grid aware aggregation of simulated variables to course grids; and (4) freeing of resources for treatment of uncertainty in the modelling process.

TopoSUB: a tool for efficient large area numerical modelling in complex topography at sub-grid scales

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