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| Titel |
High-resolution hydraulic parameter maps for surface soils in tropical South America |
| VerfasserIn |
T. R. Marthews, C. A. Quesada, D. R. Galbraith, Y. Malhi, C. E. Mullins, M. G. Hodnett, I. Dharssi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 7, no. 3 ; Nr. 7, no. 3 (2014-05-06), S.711-723 |
| Datensatznummer |
250115611
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| Publikation (Nr.) |
 copernicus.org/gmd-7-711-2014.pdf |
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| Zusammenfassung |
| Modern land surface model simulations capture soil profile water movement
through the use of soil hydraulics sub-models, but good hydraulic
parameterisations are often lacking, especially in the tropics. We present
much-improved gridded data sets of hydraulic parameters for surface soil for
the critical area of tropical South America, describing soil profile water
movement across the region to 30 cm depth. Optimal hydraulic parameter
values are given for the Brooks and Corey, Campbell, van Genuchten–Mualem
and van Genuchten–Burdine soil hydraulic models, which are widely used
hydraulic sub-models in land surface models. This has been possible through
interpolating soil measurements from several sources through the SOTERLAC soil and
terrain data base and using the most recent pedotransfer functions (PTFs)
derived for South American soils. All soil parameter data layers are
provided at 15 arcsec resolution and available for download, this being 20x
higher resolution than the best comparable parameter maps available to date.
Specific examples are given of the use of PTFs and the importance
highlighted of using PTFs that have been locally parameterised and that are
not just based on soil texture. We discuss current developments in soil
hydraulic modelling and how high-resolution parameter maps such as these can
improve the simulation of vegetation development and productivity in land
surface models. |
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