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Mark R. Jury, Roseanne D. Diab, and Mark Schormann

Abstract

Aircraft surveys have been conducted to assess the mesoscale pattern of wind and weather over Cape Saint Francis, South Africa, on the southern tip of the African continent. Ten surveys were flown at a level of 100 m above ground during November 1991, and wind velocity, turbulence, and temperature were monitored. Results were stratified into composites according to the mean direction and speed of the wind. Under the prevailing westerly wind, three areas of high speed were found that may constitute optimal sites for wind energy turbines. These areas of high velocities lie along the tops of low rolling hills in the vicinity of the Krom River at Cape Saint Francis. The usefulness of aircraft surveys in developing an understanding of the mesoscale pattern of winds and associated meteorological fields is emphasized.

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Griffith Morgan, Mark Schormann, Erika Botha, and Graeme K. Mather

Abstract

A technique has been developed for deriving estimates of condensed water mixing ratio in cumulus clouds from measurements of potential temperature in the air in the compressor of a jet engine. Condensate that enters the engine at low temperatures (near −10°C) is evaporated in the compressor, causing a cooling of the air that is proportional to the amount of condensate evaporated. An important element of the technique is a correction for the time response of the temperature measurement system mounted in the compressed air. This new technique is simpler and more robust than an earlier technique based on measurement of the vapor concentration in the compressed air by an optical extinction (at Lyman-alpha wavelength) method. The values of condensed water mixing ratio derived from the new system are shown to be similar to those from the optical extinction system, previously reported in the literature.

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