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| Titel |
Quantifying mesoscale soil moisture with the cosmic-ray rover |
| VerfasserIn |
B. Chrisman, M. Zreda |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 17, no. 12 ; Nr. 17, no. 12 (2013-12-17), S.5097-5108 |
| Datensatznummer |
250086032
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| Publikation (Nr.) |
 copernicus.org/hess-17-5097-2013.pdf |
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| Zusammenfassung |
| Soil moisture governs the surface fluxes of mass and energy and is a major
influence on floods and drought. Existing techniques measure soil moisture
either at a point or over a large area many kilometers across. To bridge
these two scales we used the cosmic-ray rover, an instrument similar to the
recently developed COSMOS probe, but bigger and mobile. This paper explores
the challenges and opportunities for mapping soil moisture over large areas
using the cosmic-ray rover. In 2012, soil moisture was mapped 22 times in a
25 km × 40 km survey area of the Tucson Basin at an average of
1.7 km2 resolution, i.e., a survey area extent comparable to that of a pixel for the
Soil Moisture and Ocean Salinity (SMOS) satellite mission. The soil moisture
distribution is dominated by climatic variations, notably by the North
American monsoon, that results in a systematic increase in the standard
deviation, observed up to 0.022 m3 m−3, as a function of the
mean, between 0.06 m3 m−3 and 0.14 m3 m−3. Two
techniques are explored to use the cosmic-ray rover data for hydrologic
applications: (1) interpolation of the 22 surveys into a daily soil moisture
product by defining an approach to utilize and quantify the observed
temporal stability producing an average correlation coefficient of 0.82 for
the soil moisture distributions that were surveyed, and (2) estimation of
soil moisture profiles by combining surface moisture from satellite
microwave sensors (SMOS) with deeper measurements from the cosmic-ray rover.
The interpolated soil moisture and soil moisture profiles allow for
basin-wide mass balance calculation of evapotranspiration, which amounted to
241 mm in 2012. Generating soil moisture maps with a cosmic-ray rover at this
intermediate scale may help in the calibration and validation of satellite
soil moisture data products and may also aid in various large-scale
hydrologic studies. |
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