Eddy Covariance for CO2 and H2O (e.g., Campbell Scientific IRGASON) Quantity 1: CO2/H2O Open-Path Gas Analyzer Quantity 1: 3-D Sonic Anemometer o IP Rating: IP65 or better o Bandwidth: 20Hz logging capable o Operating Range: -20°C to 50°C o Accuracy: H2O and CO2: ±2% o Power Use: 8 Watts or less o Sonic Anemometer Measurement Range: 0-45 m/s o Sonic Anemometer Precision/Accuracy: <1.5% RMS @12m/s for ux, uy, and uz Sonic Anemometers Quantity 1: 3D sonic o capable of logging 20Hz (eg CSAT3B) Quantity 2: 2D sonic o capable of logging to 10Hz (eg Gill WindObserver 65) IP Rating: IP65 or better Air Temperature and Relative Humidity Probes Quantity 4: combination Air temperature / relative humidity probes o Field-replaceable chip to avoid the need for laboratory calibration o Operating Range: Relative Humidity: 0 to 100% RH Air Temperature: -40°C to +70°C o Accuracy: Relative Humidity: ±1.5% (at 25°C, over 0-80% RH) ±2% (at 25°C, over 80-100% RH)
