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Cosmic-Ray Soil Moisture Measurements for Improved Land Management

Learn about the CosmOz network and its impact on soil moisture monitoring. Discover probe corrections, calibration methods, and useful data processing approaches. Explore how this technology aids in better understanding and managing land resources.

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Cosmic-Ray Soil Moisture Measurements for Improved Land Management

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  1. Probe use while upside down David McJannet & Aaron Hawdon CSIRO Land and Water / Water for a healthy country CosmOz Australian cosmic-ray soil moisture observing network

  2. CosmOz - Australian cosmic-ray soil moisture observing network http://www.marsdaily.com CosmOz - funded in 2010 through internal CSIRO budget 11 probes were purchased– last one installed June 2011 Developed collaborative network with Uni Tas, Uni NSW, Monash Uni, Charles Darwin Uni Co-located with other measurements e.g. flux towers, water balance, CalVal, crop growth Current funding: 0.75 full time person Cosmic-ray soil moisture measurements | David McJannet

  3. CosmOz monitoring locations Cosmic-ray soil moisture measurements | David McJannet

  4. Bit of geography... 80% live within 50 km (30 miles) of coast Cosmic-ray soil moisture measurements | David McJannet

  5. CosmOz setup Rain gauge Satellite link Solar panel Pressure sensor (temperature & humidity soon) Data logger Small concrete pad Neutron tube (moderated) Cosmic-ray soil moisture measurements | David McJannet

  6. Cosmic-ray soil moisture measurements | David McJannet

  7. The CosmOz network: Data delivery http://cosmoz.csiro.au/cosmoz/ Cosmic-ray soil moisture measurements | David McJannet

  8. Where are we up to? • All probes installed • Longest record – 2 yrs • Shortest record – 1.25 yrs • Very reliable - one cable failure and one probe replaced • Calibrations – Aiming for a wet and a dry calibration per site (at least) • 4 sites have 2+ calibrations • 6 sites have dry calibrations • Lattice water sampling currently underway • Data processing approaches defined and being implemented Cosmic-ray soil moisture measurements | David McJannet

  9. Observations and discussion points • Corrections • Pressure • Vapour • Dosage • Calibrations • Surface runoff • Probe corrections and data smoothing Cosmic-ray soil moisture measurements | David McJannet

  10. Corrections – Vapour pressure Weany Creek 2011 – Vapour Correction 10% Standard COSMOS correction applied Where possible we use local site data Plan to add Hydroinnova T & RH to each site Cosmic-ray soil moisture measurements | David McJannet

  11. Corrections – Atmospheric Pressure Weany Creek Probe Inspired by Marek’s Hurricane Sandy slide - Cyclone Yasi Category 5 cyclone - 285 km/h (180 m/h) Cosmic-ray soil moisture measurements | David McJannet

  12. Dealing with the aftermath... Cosmic-ray soil moisture measurements | David McJannet

  13. Corrections – Atmospheric Pressure Weany Creek Probe Corrections range by 20% Cosmic-ray soil moisture measurements | David McJannet

  14. Corrections – Cosmic-ray dose (discussion) CosmOz cut-off rigidity varies from 2 – 13 Originally extracted site specific dosage (kspc22.unibe.ch) but stopped in early 2012 Moved to data from NMDB.eu using Swiss station but found some issues after discussions with Marek... Cosmic-ray soil moisture measurements | David McJannet

  15. Corrections – Cosmic-ray dose Solar Flare Cosmic-ray soil moisture measurements | David McJannet

  16. Corrections – Cosmic-ray dose Up to 10% difference Solar Flare It does make some difference – which is more correct? For now CosmOz sticking with nearest Rigidity NMDB.eu site Keep in mind this could be important when the world ends on 21st Dec! Cosmic-ray soil moisture measurements | David McJannet

  17. Calibration of CosmOz probes 24 sampling points – 8 points in each of 3 concentric rings 3 depths at each point = 72 samples (0-5, 10-15, 25-30cm) Collect wet and dry soil calibration points Standard calibration function tuned to measurements using one free parameter Cosmic-ray soil moisture measurements | David McJannet

  18. Calibration – Weany Creek Cosmic-ray soil moisture measurements | David McJannet

  19. Cosmic-ray probe and lattice water Lattice water samples being prepared for ACTLABS For now using relationship between lattice water and clay content for Australian soils Cosmic-ray soil moisture measurements | David McJannet

  20. Calibration – Weany Creek Add in lattice water estimate Cosmic-ray soil moisture measurements | David McJannet

  21. Calibration – Tullochgorum Add in lattice water estimate Cosmic-ray soil moisture measurements | David McJannet

  22. Calibration – Robson Creek Add in lattice water ??? Is this a soil carbon effect? Cosmic-ray soil moisture measurements | David McJannet

  23. Calibration - Gnangara Soil almost pure silica sand Collected one wet calibration point (assume no lattice water) Applied calibration to whole time-series Cosmic-ray soil moisture measurements | David McJannet

  24. Calibration - Gnangara -ve! Standard curve fit not applicable (<2%!) Empirical fit and more data points required Cosmic-ray soil moisture measurements | David McJannet

  25. Weany Creek -case study Weany Creek Cosmic-ray soil moisture measurements | David McJannet

  26. Weany Cr - measurement depth and fluxes Infiltration Drainage and evaporation Water flux (mm) Cosmic-ray soil moisture measurements | David McJannet

  27. Discussion points – Probe corrections & Filtering At least 4 four probe types – is there a need for comparison of ‘standardised count’? i.e. San Pedro Cosmic-ray soil moisture measurements | David McJannet

  28. CosmOz future directions Cosmic-ray soil moisture measurements | David McJannet

  29. Future – South East Esk Sensor Web Smart irrigation project Balancing farmer, hydro-power and environment needs Measurements coupled with flow/rain prediction (1km grid, 6 hr) Near real-time decision making 3 cosmic-ray probes Cosmic-ray soil moisture measurements | David McJannet

  30. Future – Potential adopters • Apart from CSIRO and uni researchers the Bureau of Meteorology is a potential adopter • Bureau of Meteorology has interests in weather prediction and water balance accounting • Recent seminars given to demonstrate potential uses of cosmic-ray probes • Used combination of CosmOz and COSMOS progress • Lots of interest in applications from various groups...no commitments as yet...watch this space! • Hopefully you will hear more about CosmOz at future meetings Cosmic-ray soil moisture measurements | David McJannet

  31. David McJannet • Email David.McJannet@csiro.au CSIRO Land and Water / Water for a Healthy Country

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