Australian Cosmic-Ray Soil Moisture Network Hourly Measurements

The CosmOz network provides hourly soil moisture estimates from 19 stations across Australia, using cosmic-ray sensors that measure fast neutrons over an area of approximately 30 hectares. The data includes parameters like neutron counts, rainfall, temperature, humidity, and atmospheric pressure, with measurements representing an effective soil depth of 10-30 cm. The network was established in 2010 and is maintained by CSIRO and TERN.

Use Cases

• Model the inverse correlation between neutron counts and soil moisture content to estimate water storage over 30-hectare footprints.
• Analyze hourly rainfall data alongside soil moisture estimates to study infiltration and drying dynamics at each station.
• Integrate temperature, humidity, and atmospheric pressure sensor readings with neutron data to correct for environmental effects on cosmic-ray measurements.
• Use the reported effective depth of measurements (10-30 cm) to validate satellite-derived surface soil moisture products.

Strengths

• Data is reported at an hourly interval, providing high temporal resolution for monitoring soil moisture dynamics.
• The network consists of 19 stations, offering spatially distributed observations across Australia.
• Each sensor provides estimates over a large spatial footprint of approximately 30 hectares, bridging point and satellite scales.
• The methodology is passive, non-contact, and largely insensitive to soil texture and bulk density, as described in the input.

Limitations

• The dataset's total size and row count are unknown, making it difficult to assess its volume for large-scale analysis.
• Soil moisture estimates require in-field calibration involving soil sampling, which may not be uniformly available for all stations or time periods.
• The measurement depth varies with soil moisture content, which could complicate comparisons with fixed-depth sensor data.

Provenance

Source

Terrestrial Ecosystem Research Network's Data Discovery

Collection Method

Data is collected by standard cosmic-ray sensor installations, each including a neutron tube, rain gauge, temperature, humidity, and pressure sensors, with calibration procedures described by Hawdon et al. 2014.

Time Range

The network was established in 2010, with data collection ongoing.

Freshness

The metadata indicates a last update in March 2026, suggesting ongoing maintenance.

Geography

Australia, from 19 station locations.