Eichinger et al. (1993) discuss the use of a Raman lidar for measureme
nts of water vapor fluxes and suggest that the method is superior to t
he use of standard micrometeorological point sensor measurements. Alth
ough the lidar shows considerable promise for some purposes, we believ
e that their criticisms of point sensors are not warranted; that there
are difficulties with their application of dissipation techniques to
extract fluxes; and that they misinterpret the existence of plume stru
ctures as statistically significant spatial variations of turbulent fl
uxes.