Roland Baatz Process-based modelling of regional water and energy fluxes taking into account measured neutron intensities by cosmic-ray probes

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Inhaltsangabe zu „Process-based modelling of regional water and energy fluxes taking into account measured neutron intensities by cosmic-ray probes“ von Roland Baatz

At the land surface, the hydrologic cycle is strongly linked to soil water content (SWC). Land surface models describe the mass and energy fluxes at the land surface and to the atmosphere with a spatial resolution of a few km2 at the catchment scale. The calibration and evaluation of land surface models requests observation data, ideally at the same spatial resolution. SWC characterization by model prediction and observation remains a challenge in land surface hydrology. Recently, cosmic-ray probes (CRPs) were developed for continuous passive SWC estimation from neutron flux measurements at a scale relevant for land surface models. One objective of this work was to set up a network of ten CRPs and to evaluate SWC estimates by CRPs. For evaluation, the footprint average SWC of the CRPs was compared to the horizontally and vertically weighted signal of two distributed networks of in-situ SWC sensors. Three different parameterization methods to estimate SWC from neutron flux were compared. Numerical complexity and potential applications distinguish the three parameterization methods. The three parameterization methods resulted in close SWC estimates at the ten study sites although the neutron flux – SWC relationships were slightly different amongst the parameterization methods. SWC estimated by the calibrated CRPs was very close to SWC measured by alternative SWC measurements. Root mean square errors (RMSEs) of the SWC were 0.031 cm3/cm3 at the distributed in-situ SWC sensor networks. ...

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