Simple Process-Led Algorithms for Simulating Habitats (SPLASH v.1.0): Robust Indices of Radiation, Evapotranspiration and Plant-Available Moisture

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Title: Simple Process-Led Algorithms for Simulating Habitats (SPLASH v.1.0): Robust Indices of Radiation, Evapotranspiration and Plant-Available Moisture
Author(s): Davis, TW
Prentice, IC
Stocker, BD
Whitely, RJ
Wang, H
Evans, BJ
Gallego-Sala, AV
Sykes, MT
Cramer, W
Item Type: Journal Article
Abstract: Bioclimatic indices for use in studies of ecosystem function, species distribution, and vegetation dynamics under changing climate scenarios depend on estimates of surface fluxes and other quantities, such as radiation, evapotranspi- ration and soil moisture, for which direct observations are sparse. These quantities can be derived indirectly from me- teorological variables, such as near-surface air temperature, precipitation and cloudiness. Here we present a consolidated set of simple process-led algorithms for simulating habitats (SPLASH) allowing robust approximations of key quantities at ecologically relevant timescales. We specify equations, derivations, simplifications, and assumptions for the estima- tion of daily and monthly quantities of top-of-the-atmosphere solar radiation, net surface radiation, photosynthetic photon flux density, evapotranspiration (potential, equilibrium, and actual), condensation, soil moisture, and runoff, based on analysis of their relationship to fundamental climatic drivers. The climatic drivers include a minimum of three meteoro- logical inputs: precipitation, air temperature, and fraction of bright sunshine hours. Indices, such as the moisture index, the climatic water deficit, and the Priestley–Taylor coeffi- cient, are also defined. The SPLASH code is transcribed in C++, FORTRAN, Python, and R. A total of 1 year of results are presented at the local and global scales to exemplify the spatiotemporal patterns of daily and monthly model outputs along with comparisons to other model results.
Publication Date: 14-Feb-2017
Date of Acceptance: 16-Jan-2017
URI: http://hdl.handle.net/10044/1/56737
DOI: https://dx.doi.org/10.5194/gmd-2016-49
ISSN: 1991-959X
Publisher: Copernicus Publications
Start Page: 689
End Page: 708
Journal / Book Title: Geoscientific Model Development
Volume: 10
Issue: 2
Copyright Statement: © 2017 Author(s). This work is distributed under the Creative Commons Attribution 3.0 License (https://creativecommons.org/licenses/by/3.0/).
Publication Status: Published
Appears in Collections:Centre for Environmental Policy
Faculty of Natural Sciences



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