<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Footprint characteristics revised for field-scale soil moisture monitoring with cosmic-ray neutrons"^^ . "Cosmic-ray neutron probes are widely used to monitor environmental water content near the surface. The method averages over tens of hectares and is unrivaled in serving representative data for agriculture and hydrological models at the hectometer scale. Recent experiments, however, indicate that the sensor response to environmental heterogeneity is not fully understood. Knowledge of the support volume is a prerequisite for the proper interpretation and validation of hydrogeophysical data. In a previous study, several physical simplifications have been introduced into a neutron transport model in order to derive the characteristics of the cosmic-ray probe's footprint. We utilize a refined source and energy spectrum for cosmic-ray neutrons and simulate their response to a variety of environmental conditions. Results indicate that the method is particularly sensitive to soil moisture in the first tens of meters around the probe, whereas the radial weights are changing dynamically with ambient water. The footprint radius ranges from 130 to 240 m depending on air humidity, soil moisture, and vegetation. The moisture-dependent penetration depth of 15 to 83 cm decreases exponentially with distance to the sensor. However, the footprint circle remains almost isotropic in complex terrain with nearby rivers, roads or hill slopes. Our findings suggest that a dynamically weighted average of point measurements is essential for accurate calibration and validation. The new insights will have important impact on signal interpretation, sensor installation, data interpolation from mobile surveys, and the choice of appropriate resolutions for data assimilation into hydrological models."^^ . "2015" . . . "51" . "7" . . "Wiley"^^ . . . "Water Resources Research"^^ . . . "19447973" . . . . . . . . . . . . . . . . . . . . "Markus"^^ . "Köhli"^^ . "Markus Köhli"^^ . . "Martin"^^ . "Schrön"^^ . "Martin Schrön"^^ . . "Steffen"^^ . "Zacharias"^^ . "Steffen Zacharias"^^ . . "Marek"^^ . "Zreda"^^ . "Marek Zreda"^^ . . "Peter"^^ . "Dietrich"^^ . "Peter Dietrich"^^ . . "Ulrich"^^ . "Schmidt"^^ . "Ulrich Schmidt"^^ . . . . . . "Footprint characteristics revised for field-scale soil moisture monitoring with cosmic-ray neutrons (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Footprint characteristics revised for field-scale soil moisture monitoring with cosmic-ray neutrons (PDF)"^^ . . . "Footprint_characteristics _revised_2015.pdf"^^ . . . "Footprint characteristics revised for field-scale soil moisture monitoring with cosmic-ray neutrons (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Footprint characteristics revised for field-scale soil moisture monitoring with cosmic-ray neutrons (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Footprint characteristics revised for field-scale soil moisture monitoring with cosmic-ray neutrons (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Footprint characteristics revised for field-scale soil moisture monitoring with cosmic-ray neutrons (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #34407 \n\nFootprint characteristics revised for field-scale soil moisture monitoring with cosmic-ray neutrons\n\n" . "text/html" . . . "530 Physik"@de . "530 Physics"@en . .