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@ARTICLE{Baatz:151431,
      author       = {Baatz, R. and Bogena, Heye and Hendricks Franssen, H.-J.
                      and Huisman, J. A. and Qu, W. and Montzka, C. and Vereecken,
                      H.},
      title        = {{C}alibration of a catchment scale cosmic-ray probe
                      network: {A} comparison of three parameterization methods},
      journal      = {Journal of hydrology},
      volume       = {516},
      issn         = {0022-1694},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2014-01379},
      pages        = {231–244},
      year         = {2014},
      abstract     = {The objective of this work was to assess the accuracy of
                      soil water content determination from neutron flux measured
                      by cosmic-ray probes under humid climate conditions. Ten
                      cosmic-ray probes were set up in the Rur catchment located
                      in western Germany, and calibrated by gravimetric soil
                      sampling campaigns. Aboveground biomass was estimated at the
                      sites to investigate the role of vegetation cover on the
                      neutron flux and the calibration procedure. Three
                      parameterization methods were used to generate site-specific
                      neutron flux - soil water content calibration curves: i) the
                      N0-method, ii) the hydrogen molar fraction method
                      (hmf-method), and iii) the COSMIC-method. At five locations,
                      calibration measurements were repeated to evaluate
                      site-specific calibration parameters obtained in two
                      different sampling campaigns. At two locations, soil water
                      content determined by cosmic-ray probes was evaluated with
                      horizontally and vertically weighted soil water content
                      measurements of two distributed in-situ soil water content
                      sensor networks. All three methods were successfully
                      calibrated to determine field scale soil water content
                      continuously at the ten sites. The hmf-method and the
                      COSMIC-method had more similar calibration curves than the
                      N0-method. The three methods performed similarly well in the
                      validation and errors were within the uncertainty of neutron
                      flux measurements despite observed differences in the
                      calibration curves and variable model complexity. In
                      addition, we found that the obtained calibration parameters
                      NCOSMIC, N0 and NS showed a strong correlation with
                      aboveground biomass.},
      cin          = {IBG-3},
      ddc          = {690},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {246 - Modelling and Monitoring Terrestrial Systems: Methods
                      and Technologies (POF2-246) / 255 - Terrestrial Systems:
                      From Observation to Prediction (POF3-255)},
      pid          = {G:(DE-HGF)POF2-246 / G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000339036100022},
      doi          = {10.1016/j.jhydrol.2014.02.026},
      url          = {https://juser.fz-juelich.de/record/151431},
}