Simple process-led algorithms for simulating habitats (SPLASH v.1.0): robust indices of radiation, evapotranspiration and plant-available moisture
- 1. Dept. Life Sciences, Imperial College London
- 2. Dept. Life Sciences, Imperial College London; Dept. Biological Sciences, Macquarie University; State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, College of Forestry; Terrestrial Ecosystem Research Network (TERN) Ecosystem Modelling and Scaling Infrastructure (eMAST), Sydney
- 3. Dept. Biological Sciences, Macquarie University; Terrestrial Ecosystem Research Network (TERN) Ecosystem Modelling and Scaling Infrastructure (eMAST), Sydney
- 4. Dept. Biological Sciences, Macquarie University; State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, College of Forestry
- 5. Terrestrial Ecosystem Research Network (TERN) Ecosystem Modelling and Scaling Infrastructure (eMAST), Sydney; Dept. Environmental Sciences, The University of Sydney
- 6. Dept. Geography, University of Exeter
- 7. Dept. Physical Geography and Ecosystem Science, Lund University
- 8. Mediterranean Institute of marine and terrestrial Biodiversity and Ecology, Aix Marseille University, CNRS, IRD, Avignon University
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, evapotranspiration and soil moisture, for which direct observations are sparse. These quantities can be derived indirectly from meteorological variables, such as near-surface air temperature, precipitation and cloudiness. Here we present the first version of the consolidated Simple Process-Led Algorithms for Simulating Habitats (SPLASH) allowing robust approximations of key quantities at ecologically relevant time scales. We specify equations, derivations, simplifications and assumptions for the estimation 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 meteorological inputs: precipitation, air temperature, and fraction of bright sunshine hours. The SPLASH code is transcribed in C++, FORTRAN, Python, and R. We present SPLASH in a modular framework to be readable, understandable, and reproducible. One year of example data is also provided.
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