Some thoughts on in-situ flux measurement in the atmospheric surface layer
Due to its complexity, the state of a turbulent atmosphere can only be described using statistical quantities such as means, variances, and covariances. Computation of these statistical quantities, particularly those of higher order, must be done with considerable care. This is particularly true if the statistics are used to depict heat and momentum fluxes. This note contains considerations that could help the experimentalist to obtain high quality eddy covariance measurements needed to characterize these fluxes using sonic anemometer/ thermometer (sonic) measurements from a fixed platform mounted within the atmospheric surface layer (ASL).