An Analysis of Wangara Micrometeorology: Surface Stress, Sensible Heat, Evaporation, and Dewfall

摘要

Eddy fluxes and gradients reported for the Wangara experiment and earlier investigations of flux-gradient relations are used to derive values of the sensible heat flux and friction velocity appropriate to the general area of the Wangara experiment rather than to the considerably smoother central site. Friction velocities appear to be considerably greater than those developed in previous studies of the Wangara data set. Sensible heat fluxes are similar during daytime, but differ greatly from other estimates for night. Dewfall evaluations indicate a total of about 9 mm during the experiment; condensation occurred at rates that sometimes approached but rarely exceeded the theoretical maximum rate of about 0.07 mm/hr. Maximum dewfall occurred under clear skies (less than 40% cloud cover), and in moderate winds.