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The retrieval of cloud microphysical properties from remote sensors  is challenging. In the past, ground-based radar-radiometer  measurements have been successfully used to retrieve the liquid  water content profile in nondrizzling clouds but offer little  constraint in retrieving other moments of the cloud particle size  distribution (PSD). Here, a microphysical condensational model under  steady-state supersaturation conditions is utilized to provide  additional constraints to the well-established radar-radiometer  retrieval techniques. The coupling of the model with the  observations allows the retrieval of the three parameters of  a lognormal PSD, with two of them being height dependent. Two  periods of stratocumulus from the Azores are used to evaluate the  novel technique. The results appear reasonable in two nondrizzling periods: continental-like  number concentrations are retrieved, in agreement with the  drizzle-free cloud conditions. The cloud optical depth derived from  the retrieved distributions compares well in magnitude and  variability with the one derived independently from a narrow field  of view zenith radiometer. Uncertainties coming from the  measurements are propagated to the retrieved quantities to estimate  their errors. In general, errors smaller than 20% should be  attainable for most parameters, demonstrating the added value of the  new technique

Radar-radiometer retrievals of cloud number concentration and dispersion parameter in nondrizzling marine stratocumulus