GMD Geoscientific Model Development GMD Geosci. Model Dev. 1991-9603 Copernicus Publications Göttingen, Germany 10.5194/gmd-7-725-2014 Snow water equivalent modeling components in NewAge-JGrass Formetta G. https://orcid.org/0000-0002-0252-1462 1 Kampf S. K. 2 David O. 3 Rigon R. https://orcid.org/0000-0002-7668-5806 1 University of Trento, 77 Mesiano St., 38123 Trento, Italy Dept. of Ecosystem Science and Sustainability, Colorado State University, Fort Collins, CO, USA Dept. of Civil and Environmental Engineering, Colorado State University, Fort Collins, CO, USA 06 05 2014 7 3 725 736 Copyright: © 2014 G. Formetta et al. 2014 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://gmd.copernicus.org/articles/7/725/2014/gmd-7-725-2014.html The full text article is available as a PDF file from https://gmd.copernicus.org/articles/7/725/2014/gmd-7-725-2014.pdf

This paper presents a package of modified temperature-index-based snow water equivalent models as part of the hydrological modeling system NewAge-JGrass. Three temperature-based snow models are integrated into the NewAge-JGrass modeling system and use many of its components such as those for radiation balance (short wave radiation balance, SWRB), kriging (KRIGING), automatic calibration algorithms (particle swarm optimization) and tests of goodness of fit (NewAge-V), to build suitable modeling solutions (MS). Similarly to all the NewAge-JGrass components, the models can be executed both in raster and in vector mode. The simulation time step can be daily, hourly or sub-hourly, depending on user needs and availability of input data. The MS are applied on the Cache la Poudre River basin (CO, USA) using three test applications. First, daily snow water equivalent is simulated for three different measurement stations for two snow model formulations. Second, hourly snow water equivalent is simulated using all the three different snow model formulae. Finally, a raster mode application is performed to compute snow water equivalent maps for the whole Cache la Poudre Basin.

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