The 5 Science goals of the CASES-99 Experiment

    1. to provide a time history of internal gravity waves, KH shear instabilities, and turbulence events in the nighttime stable boundary layer, and to evaluate the relative contributions to intermittent heat, moisture and momentum fluxes that can be associated with these phenomena. Sources of turbulence bursts include, but are not restricted to, surface and elevated shear layers and KH instability, internal gravity waves within the stable boundary layer, drainage currents, and surface vortex shedding.
    2. to measure heat and momentum fluxes and their divergences accompanying the events contributing to turbulence, transports, and mixing throughout the nocturnal boundary layer, and especially within the surface layer (~ 10 to 20 m), to assess the departures from similarity theory under weakly stable and very stable conditions.
    3. to define the relative importance of surface heterogeneity, particularly under very stable light wind conditions, on the initiation of shallow drainage currents (O [10m]), and the horizontal and vertical transports that accompany such boundary undulations.
      4. * This science goal may be dropped pending the involvement of certain scientists as of May, 1999) *
    4. to improve our current understanding of the diffusion, dispersion, meandering and concentration fluctuations of plumes that emanate from ground-based and, possibly, elevated sources, during both clear and cloud-topped nocturnal boundary layer conditions.
    5. to acquire data during the transition from a convective to a stable boundary layer regime and vice-versa to compare with existing models of this transition, and to assess the role of this transition period in the initiation of inertial oscillations and the enhancement of low-level jets ~ 100-300 m above the surface.