Abstract

Abstract An instrument for measuring the condensed water content in supercooled clouds is described. The instrument operates by evaporating the water and then measuring the specific humidity by ultraviolet absorption. The inclusion of a temperature control in the evaporator permits operation at water contents as high as 40 g m−3. The intake aperture is 0.8 cm in diameter, and the response time approximately 1 s. It is shown that the variance of the total water content can be used to derive the radar reflectivity with no knowledge of the drop size spectrum. Examples of data obtained inside mature convective storms are shown.

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