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, T
Prentice, IC
Stocker, BD
Thomas, RT
Whitley, 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, 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 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 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. Indices, such as the moisture index, the climatic water deficit, and the Priestley–Taylor coefficient, 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/10044/1/45592
DOI: https://dx.doi.org/10.5194/gmd-10-689-2017
ISSN: 1991-9603
Publisher: European Geosciences Union (EGU)
Start Page: 689
End Page: 708
Journal / Book Title: Geoscientific Model Development
Volume: 10
Issue: 2
Copyright Statement: © Author(s) 2017. This work is distributed under the Creative Commons Attribution 3.0 License (https://creativecommons.org/licenses/by/3.0/).
Sponsor/Funder: AXA Research Fund
Funder's Grant Number: AXA Chair Programme in Biosphere and Climate Impacts
Keywords: Science & Technology
Physical Sciences
Geosciences, Multidisciplinary
Geology
PHOTOSYNTHETICALLY ACTIVE RADIATION
GLOBAL VEGETATION MODELS
SOLAR IRRADIANCE TREND
CLIMATE-CHANGE
TERRESTRIAL BIOSPHERE
EQUILIBRIUM EVAPORATION
WATER
SOIL
CLASSIFICATION
TEMPERATURE
04 Earth Sciences
Publication Status: Published
Open Access location: http://www.geosci-model-dev.net/10/689/2017/
Appears in Collections:Centre for Environmental Policy



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