Sciences (CIRES), and NOAAIERL, Weather Modification Program Ofice, Boulder, Col orado 80303, U.S.A.Abstract. The influence of water vapor fluctuations on vertical turbulent fluxes is examined. It is shown that effects on density and, consequently, buoyancy are insignificant. However, because specific heat of air is a function of specific humidity, these fluctuations are found to influence sensible heat flux significantly. The critical parameter is the Bowen ratio, and a formulation relating the heat flux assuming dry air to the true value is given. The implications of this analysis to flux-gradient relationships in the surface layer are commented on.
It has been long known by Australian meteorologists that a nocturnal jet is a frequent feature of the low-level wind profile at Daly Waters in the Northern Territory of Australia. The Koorin Expedition during the southern winter of 1974 obtained data on wind and temperature profiles in the boundary layer which form an ideal base for the study of this phenomenon. In this paper, a simple mode1 of the jet is described and the results of the model are compared with observations. The mode1 is essentially a development of the pioneering work of Blackadar, who proposed that a low-level jet could develop as an inertia1 oscillation. The observations do show some of the features of the model.
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