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@INPROCEEDINGS{Jakobi:867201,
      author       = {Jakobi, Jannis and Huisman, Johan Alexander and Schrön,
                      Martin and Zacharias, Stefffen and Bogena, Heye},
      title        = {{S}imultaneous measurement of soil moisture and biomass
                      pattern with a{CRNS} rover},
      reportid     = {FZJ-2019-06018},
      year         = {2019},
      abstract     = {While "classical" stationary cosmic-ray neutron sensors
                      (CRNS) measure the temporal variability of soil moistureat
                      the field scale, the mobile application of CRNS (CRNS
                      rover) enables to capture the spatial variability of
                      soilmoisture across larger areas or transects. The CRNS
                      rover consists of two components - a vehicle and a set
                      oflarge neutron counters. The detectors need to have higher
                      count rates in order to achieve sufficient sensitivity
                      forvery short recording periods (e.g. 1 min). To date, only
                      few experiments have been conducted with the CRNSrover over
                      a wide range of different land-use types. Such experiments
                      are needed as the neutron intensity is notonly sensitive to
                      soil moisture, but also to all other additional sources of
                      hydrogen (e.g. biomass), which needto be corrected for.
                      Interestingly, the ratio between thermal and fast neutron
                      intensity (Nr) seems to be a verygood indicator for
                      vegetation and can be used for the correction of aboveground
                      biomass effects on soil moisturemeasurements with cosmic-ray
                      neutrons. This enables the possibility for “on-the-fly”
                      correction of soil moisturemeasurements without the need for
                      laborious local biomass sampling during CRNS roving
                      campaigns. In addition,using the Nr-information from CRNS
                      roving would allow for the simultaneous measurements of soil
                      moisture andbiomass pattern at the regional scale.In this
                      contribution, we present results from a recent roving
                      campaign at the TERENO test site Selhausen(about 1 km2). We
                      used a new cosmic rover with 9 detectors and a total
                      sensitivity of approx. 1350 counts perminute, which enables
                      higher speed and larger coverage compared to other roving
                      systems. In addition, thedetectors can be modified to
                      measure either thermal or fast neutron intensity
                      measurements. During the two-weekcampaign a large set of
                      different field sites with various vegetation covers has
                      been repeatedly monitored. Thepreliminary results show that
                      CRNS rover was able to capture the general soil moisture
                      pattern and that theNr-information could be used to improve
                      the soil moisture estimation. In future we hope to enable
                      the simultaneousmeasurements of soil moisture and biomass
                      patterns at the regional scale with Nr-information from CRNS
                      roving.},
      month         = {Apr},
      date          = {2019-04-07},
      organization  = {EGU General Assembly 2019, Vienna
                       (Austria), 7 Apr 2019 - 12 Apr 2019},
      subtyp        = {After Call},
      cin          = {IBG-3},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255) / TERENO - Terrestrial Environmental
                      Observatories (TERENO-2008)},
      pid          = {G:(DE-HGF)POF3-255 / G:(DE-HGF)TERENO-2008},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/867201},
}