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Earth System Science Data The Data Publishing Journal
https://doi.org/10.5194/essd-2017-122
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
 
03 Jan 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Earth System Science Data (ESSD).
Analysis of Soil Hydraulic and Thermal Properties for Land Surface Modelling over the Tibetan Plateau
Hong Zhao, Yijian Zeng, Shaoning Lv, and Zhongbo Su Department of Water Resources, Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, Hengelosestraat 99, Enschede 7514AE, the Netherlands
Abstract. Soil information (e.g. soil texture and porosity) from existing soil datasets over the Tibetan Plateau (TP) is claimed to be inadequate and even inaccurate for determining soil hydraulic properties(SHP) and soil thermal properties (STP), hampering the understanding of the land surface process. As the soil varies across three dominant climate zones (i.e. arid, semi-arid, and semi-humid) over the TP, the associated SHP/STP is expected to vary correspondingly. To obtain an explicit insight into the soil hydro-thermal consistency for land surface modelling over the TP, in situ and laboratory measurements of over 40 soil property profiles were obtained across the climate zones. Results show that porosity and SHP/STP differ across the climate zones and strongly depend on soil texture. In particular, it is proposed that gravel impact on porosity and SHP/STP are both considered in the arid zone and in deep layers of the semi-arid zone. Parameterization schemes for porosity, SHP and STP are investigated and compared with measurements taken. This reveals that the porosity determined by the bulk density scheme is the most applicable for the TP. To determine the SHP, including soil water retention curves and hydraulic conductivities, the pedotransfer functions (PTFs) developed by Cosby et al. (1984) (for the Clapp-Hornberger model) and the continuous Wösten et al. (1999) (for the van Genuchten-Mualem model) are recommended. The STP parameterization scheme proposed by Farouki (1981) based on the mode of De Vries (1963) performed better across the TP than other schemes. Using the parameterization schemes mentioned above, the uncertainties of five existing regional and global soil datasets and their derived SHP/STP over the TP are quantified through comparison with in situ and laboratory measurements. The measured soil property dataset is available at http://doi.org/10.4121/uuid:61db65b1-b2aa-4ada-b41e-61ef70e57e4a.

Citation: Zhao, H., Zeng, Y., Lv, S., and Su, Z.: Analysis of Soil Hydraulic and Thermal Properties for Land Surface Modelling over the Tibetan Plateau, Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2017-122, in review, 2018.
Hong Zhao et al.
Hong Zhao et al.

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Soil Hydraulic and Thermal Properties for Land Surface Modelling over the Tibetan Plateau H. (Hong) Zhao, Y. (Yijian) Zeng, Z. (Bob) Su, and S. (Shaoning) Lv https://doi.org/10.4121/uuid:61db65b1-b2aa-4ada-b41e-61ef70e57e4a
Hong Zhao et al.

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Short summary
An in situ measurement dataset of soil physical properties was set up across the arid, semi-arid and semi-humid climate zones across the Tibetan Plateau, the Third Pole of the Earth. The applicable schemes used for porosity and soil hydraulic and thermal properties estimation were suggested for land surface modelling. Uncertainties of existing soil property datasets were quantified. This study contributes to researches from soils, hydrology, environmental science, remote sensing communities.
An in situ measurement dataset of soil physical properties was set up across the arid, semi-arid...
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