Additional sources of errors can be grouped in the following way:
* Errors introduced by instrumentation: e.g. intrinsic accuracy/ precision of the instruments, angle of attack bias of sonic anemometers, sensor drift, etc.
* Errors introduced by setup: e.g. surface heterogeneity, advection, single point of sampling, variations in footprint
* Errors introduced by processing: e.g. spectral correction, gap filling, length of averaging interval
Some of these errors can be avoided or minimized by careful and thorough experimental design and instrument maintenance, others are unavoidable and can only be controlled to some extend. Many of these errors are often ignored when reporting eddy covariance measurement results. Past studies have examined the effect of some of the listed sources of errors on eddy covariance measurements. However, most of these studies focused on a single source of error.
We will present a comprehensive analysis of the effect of various random and systematic errors on eddy covariance flux measurements of CO2, CH4, latent heat, and sensible heat. We will also analyse the relative contributions of these errors to the total uncertainty of half hourly, daily, monthly, and annual fluxes.