Gas Flux & Turbulence - The importance of Spatial & Temporal Synchronicity
Having complete spatial and temporal synchronicity of your eddy covariance (EC) dataset is paramount to making the best possible EC measurement. Consider a situation where two sensors (e.g. a gas analyser and a 3-D sonic) have independent clocks and are each measured at a rate of x Hz – there could be up to 1/x seconds of synchronicity between the measurements. Delaying one of the samples relative to the other creates the possibility of maximizing the covariance and minimizing asynchronicity to ± 1/(2x) seconds. However, perfect synchronicity is not achievable with delays since the true peak in covariance occurs between discrete samples.
By using the same control electronics and clock for both sensors, the measurements are virtually simultaneous, ensuring you have the maximum covariance. Campbell Scientific’s patented IRGASON integrated CO2/H2O and 3-D sonic anemometer was designed with this in mind, and is the only system available which provides true temporal and spatial synchronicity of your EC dataset, giving you the best possible measurement. If you’re in the market for a new Open Path CO2/H2O EC system, think IRGASON!