Retrieval of surface-layer moisture fields using CSU radars
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The surface-layer refractivity, i.e., the refractive index of air near the earth’s surface, can be retrieved from radar by examining the phase of stationary ground targets. The index of refraction is a function of pressure, temperature, and humidity, and variations are dominated by humidity in warmer weather. Since the refractivity has a significant impact on the phase of propagating radar waves, it can be measured by observing the range integrated phase change between two stationary ground targets. This index, in turn, can be used to estimate the water vapor near the surface to explore convective ...