ABSTRACT
Except within the first few millimeters of the surface, turbulence in the atmospheric boundary layer greatly dominates molecular diffusion with respect to the mixing of the variety of materials that are exchanged with the underlying surface. To a large extent, and using appropriate instrumentation, these turbulent ‘‘eddy flux’’ motions are measurable with a high level of precision and with a high degree of spatial and temporal resolution. If the property being transported is also measured with equivalent precision and spatial and temporal resolution, it is possible to monitor the flux density of the property continuously across any plane of interest.
