A gridded global data set of soil, intact regolith, and sedimentary deposit thicknesses for regional and global land surface modeling
| Autor: | David Gochis, Peter Troch, Xubin Zeng, Zachary C. Williams, Michael Brunke, Pieter Hazenberg, Patrick D. Broxton, Guo Yue Niu, Jon D. Pelletier |
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| Rok vydání: | 2016 |
| Předmět: |
Global and Planetary Change
geography Biogeochemical cycle geography.geographical_feature_category 010504 meteorology & atmospheric sciences Landform Bedrock 0208 environmental biotechnology Soil science 02 engineering and technology 01 natural sciences Regolith 020801 environmental engineering Data set Earth system science General Earth and Planetary Sciences Environmental Chemistry Sedimentary rock Geomorphology Geology Groundwater 0105 earth and related environmental sciences |
| Zdroj: | Journal of Advances in Modeling Earth Systems. 8:41-65 |
| ISSN: | 1942-2466 |
| DOI: | 10.1002/2015ms000526 |
| Popis: | Earth's terrestrial near-subsurface environment can be divided into relatively porous layers of soil, intact regolith, and sedimentary deposits above unweathered bedrock. Variations in the thicknesses of these layers control the hydrologic and biogeochemical responses of landscapes. Currently, Earth System Models approximate the thickness of these relatively permeable layers above bedrock as uniform globally, despite the fact that their thicknesses vary systematically with topography, climate, and geology. To meet the need for more realistic input data for models, we developed a high-resolution gridded global data set of the average thicknesses of soil, intact regolith, and sedimentary deposits within each 30 arcsec (∼1 km) pixel using the best available data for topography, climate, and geology as input. Our data set partitions the global land surface into upland hillslope, upland valley bottom, and lowland landscape components and uses models optimized for each landform type to estimate the thicknesses of each subsurface layer. On hillslopes, the data set is calibrated and validated using independent data sets of measured soil thicknesses from the U.S. and Europe and on lowlands using depth to bedrock observations from groundwater wells in the U.S. We anticipate that the data set will prove useful as an input to regional and global hydrological and ecosystems models. |
| Databáze: | OpenAIRE |
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