Low-cost distributed greenhouse gas flux measurement system for agricultural fields

Overview

This solution offers an affordable, distributed approach to measuring greenhouse gas (GHG) fluxes in agricultural settings. Conventional methods for quantifying CO2, CH4, and N2O fluxes typically rely on expensive equipment and specialized expertise, limiting measurements to either small-scale soil chambers or large-scale flux towers. This system bridges that gap by deploying networks of low-cost, Arduino-compatible sensors across farm fields, capturing spatial and temporal variability that single-point measurements miss.

The platform builds on a previously validated system called SMAAC, which demonstrated that a ~$150 setup can produce CO2 flux estimates comparable to commercial instruments. A subsequent ~$180 configuration successfully measured near-surface CO2 concentrations over weeks to months on solar power, revealing meaningful diurnal patterns and lower CO2 levels in fields planted with cover crops. The technology is designed for stakeholders in agriculture, environmental monitoring, carbon markets, and sustainability programs who need scalable, cost-effective flux data.

Technical specifications

• Sensor platform: Arduino-based data logger compatible with low-cost infrared GHG sensors
• Gases measured: CO2 (validated), with CH4 and N2O sensor integration in development
• Sampling frequency: Every 1–2 minutes per node
• Power: Solar-powered for extended autonomous field deployment
• Deployment configuration: Distributed grids with sensors at multiple heights per sampling location
• Cost per node: Approximately $150–$180, a fraction of conventional flux-tower systems
• Housing: Configurable enclosures with waterproofing designs under testing to minimize heat flux artifacts
• Validation reference: Field-portable FTIR greenhouse gas analyzer used to verify sensor performance

Technology readiness level

The CO2 measurement component has been validated against commercial systems and demonstrated in preliminary field tests lasting weeks to months. Current development focuses on three thrusts: integrating infrared CH4 and N2O sensors, optimizing housing and waterproofing for diverse field conditions, and conducting a distributed grid field test with multi-height sensor placement. The project is at an early-to-mid stage of development, with active prototype refinement and field validation underway.