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000897239 0247_ $$2doi$$a10.1029/2021GL094281
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000897239 1001_ $$0P:(DE-Juel1)169718$$aJakobi, J.$$b0$$eCorresponding author
000897239 245__ $$aThe Footprint Characteristics of Cosmic Ray Thermal Neutrons
000897239 260__ $$aHoboken, NJ$$bWiley$$c2021
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000897239 520__ $$aThe advance of the cosmic ray neutron (CRN) sensing method for estimating field scale soil moisture relied largely on simulations of the footprint properties of epithermal neutrons (∼0.5 eV–100 keV). Commercially available CRN probes are usually additionally equipped with a thermal neutron (<0.5 eV) detector. The potential of these measurements is rarely explored because relevant features of thermal neutrons, such as the footprint and the sensitivity to soil moisture are unknown. Here, we used neutron transport modeling and a river crossing experiment to assess the thermal neutron footprint. We found that the horizontal thermal neutron footprint ranges between 43 and 48 m distance from the probe and that the vertical footprint extends to soil depths between 10 and 65 cm depending on soil moisture. Furthermore, we derived weighting functions that quantify the footprint characteristics of thermal neutrons. These results will enable new applications of thermal neutrons.
000897239 536__ $$0G:(DE-HGF)POF4-2173$$a2173 - Agro-biogeosystems: controls, feedbacks and impact (POF4-217)$$cPOF4-217$$fPOF IV$$x0
000897239 536__ $$0G:(GEPRIS)357874777$$aDFG project 357874777 - FOR 2694: Large-Scale and High-Resolution Mapping of Soil Moisture on Field and Catchment Scales - Boosted by Cosmic-Ray Neutrons $$c357874777$$x1
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000897239 7001_ $$0P:(DE-Juel1)129472$$aHuisman, J. A.$$b1
000897239 7001_ $$00000-0001-6098-3094$$aKöhli, M.$$b2
000897239 7001_ $$0P:(DE-HGF)0$$aRasche, D.$$b3
000897239 7001_ $$0P:(DE-Juel1)129549$$aVereecken, H.$$b4
000897239 7001_ $$0P:(DE-Juel1)129440$$aBogena, H. R.$$b5
000897239 773__ $$0PERI:(DE-600)2021599-X$$a10.1029/2021GL094281$$gVol. 48, no. 15$$n15$$pe2021GL094281$$tGeophysical research letters$$v48$$x1944-8007$$y2021
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