Weak sensitivity of the terrestrial water budget to global soil texture maps in the ORCHIDEE land surface model
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Published:2020-07-24
Issue:7
Volume:24
Page:3753-3774
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ISSN:1607-7938
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Container-title:Hydrology and Earth System Sciences
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language:en
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Short-container-title:Hydrol. Earth Syst. Sci.
Author:
Tafasca Salma,Ducharne Agnès,Valentin Christian
Abstract
Abstract. Soil physical properties play an important role in estimating soil water and energy fluxes. Many hydrological and land surface models (LSMs) use soil texture maps to infer these properties. Here,
we investigate the impact of soil texture on soil water fluxes and storage at different scales
using the ORCHIDEE (ORganizing Carbon and Hydrology in Dynamic EcosystEms) LSM, forced by several complex or globally uniform soil texture maps. At the point scale, the model shows a realistic sensitivity of runoff processes and soil moisture to soil
texture and reveals that loamy textures give the highest evapotranspiration and lowest total runoff rates. The three tested complex soil texture maps result in similar water budgets at all
scales, compared to the uncertainties of observation-based products and meteorological forcing
datasets, although important differences can be found at the regional scale, particularly in areas
where the different maps disagree on the prevalence of clay soils. The three tested soil texture
maps are also found to be similar by construction, with a shared prevalence of loamy textures, and
have a spatial overlap over 40 % between each pair of maps, which explains the overall weak
impact of soil texture map change. A useful outcome is that the choice of the input soil texture
map is not crucial for large-scale modelling, but the added value of more detailed soil information (horizontal and vertical resolution, soil composition) deserves further studies.
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences,General Engineering,General Environmental Science
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