One outstanding puzzle in wind profiler data is the tendency for vertical motions to be negative over flat terrain, especially in the convective boundarylayer (CBL)(Angevine 1997). Erroneous velocities on the order of 20-40 cm s are reported during the daytime and they virtually disappear at night. After eliminating various sources of possible measurement error, Angevine (1997) concludes with t...

Results of recent experimental measurements of the effect of passive boundary layer flow control method using both singleand multiple-element Large-Eddy Break-Up devices (LEBU) on aero-optical distortions in turbulent subsonic boundary layers at a range of subsonic speeds are presented. Measurements at different locations downstream of LEBU devices were performed using a Malley probe to collect...

An improved understanding of the interaction of winds, waves, and currents in the upper ocean at scales of individual waves and wave groups is needed to further develop the next generation of climate, weather, and wave forecast models. For example, coupled wind-waveocean models (Chen et al., 2007; Black et al., 2007) are viewed as critical tools for accurate prediction of tropical cyclone inten...

After an extensive survey of mean-velocity profile measurements in various two-dimensional incompressible turbulent boundarylayer flows, it is proposed to represent the profile by a linear combination of two universal functions. One is the well-known law of the wall. The other, called the law of the wake, is characterized by the profile at a point of separation or reattachment. These functions ...

Many arid alluvial-fan terraces downwind from eolian sand sources exhibit an abrupt increase in Av-horizon thickness and sand content below a critical elevation which varies from fan to fan. Above this elevation, sand accumulates locally and is not transported across the fan. Below this elevation both coarse and fine eolian sand from nearby playa and channel sources is readily transported acros...

Microphysical and meteorological controls on the formation of open and closed cellular structures in the Southeast Pacific are explored using model simulations based on aircraft observations during the VAMOS Ocean-CloudAtmosphere-Land Study Regional Experiment (VOCALSREx). The effectiveness of factors such as boundary-layer moisture and temperature perturbations, surface heat and moisture fluxe...

A = area of the rough wall Aj = jth equal subarea of the rough region, A=NA B = empirical constant for the mean velocity profile on a rough wall; Eq. (29) CA = A-weighting factor CF = overall skin friction coefficient, 1 L R L 0 cf dx1 c = speed of sound in free field cf = local skin friction coefficient, w= 1 2 0U 2 cf0 = local skin friction coefficient at a distance xle from the leading edge ...

The dynamics of disturbances on a theoretically derived Intertropical Convergence Zone are studied. Radiative cooling over a hemisphere is parameterised by a Newtonian cooling law, relative to a radiative equilibrium temperature which decreases from equator to pole. Release of latent heat of condensation in the tropics is treated as a function of convergence in the planetary boundary layer. The...

Peroxy radical (HO2+6RO2) measurements, using the PEroxy Radical Chemical Amplification (PERCA) technique at the North Atlantic Marine Boundary Layer EXperiment (NAMBLEX) at Mace Head in summer 2002, are presented and put into the context of marine, boundarylayer chemistry. A suite of other chemical parameters (NO, NO2, NO3, CO, CH4, O3, VOCs, peroxides), photolysis frequencies and meteorologic...

Three rather different physical cases have been studied. All represent very practical geometries for which the modal behavior of vortex structures is not completely understood. The work on these problems is ongoing with the objective of obtaining physical confirmation, enhanced understanding and predictive capability for the vortex structures encountered in rotating machines. 1. Surface Flows o...