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| Titel |
A universal calibration function for determination of soil moisture with cosmic-ray neutrons |
| VerfasserIn |
T. E. Franz, M. Zreda, R. Rosolem, T. P. A. Ferre |
| 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. 2 ; Nr. 17, no. 2 (2013-02-01), S.453-460 |
| Datensatznummer |
250017702
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| Publikation (Nr.) |
 copernicus.org/hess-17-453-2013.pdf |
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| Zusammenfassung |
| A cosmic-ray soil moisture probe is usually calibrated locally using soil
samples collected within its support volume. But such calibration may be
difficult or impractical, for example when soil contains stones, in presence
of bedrock outcrops, in urban environments, or when the probe is used as a
rover. Here we use the neutron transport code MCNPx with observed soil
chemistries and pore water distribution to derive a universal calibration
function that can be used in such environments. Reasonable estimates of pore
water content can be made from neutron intensity measurements and by using
measurements of the other hydrogen pools (water vapor,
soil lattice water, soil organic carbon, and biomass). Comparisons with
independent soil moisture measurements at one cosmic-ray probe site and,
separately, at 35 sites, show that the universal calibration function
explains more than 79% of the total variability within each dataset,
permitting accurate isolation of the soil moisture signal from the measured
neutron intensity signal. In addition the framework allows for any of the
other hydrogen pools to be separated from the neutron intensity measurements,
which may be useful for estimating changes in biomass, biomass water, or
exchangeable water in complex environments. |
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