RETRIEVAL OF PRECIPITATION FROM MICROWAVE AIRBORNE SENSORS DURING TOGA COARE

The aim of this paper is to report on the retrieval of the vertically averaged liquid cloud water content and vertically averaged precipitat ion rates (rain and ice) from microwave airborne radiometric observati ons in a two-plane parallel layer atmosphere. The approach is based on the inversion of a simple radiative transfer model in which a raindro p size distribution derived from microphysical measurements is introdu ced. The microwave data (18.7, 21, 37, and 92 GHz) used were acquired by the Airborne Multichannel Microwave Radiometer and Advanced Microwa ve Moisture Sounder on board NP,SA DC8 within a mesoscale convective s ystem on 6 February 1993 during the Tropical Oceans Global Atmosphere Coupled Ocean-Atmosphere Response Experiment. Before interpreting the results, the quality of the inversion is checked. The fit between the measured and the model-retrieved brightness temperatures is good when compared to the model and measurements uncertainties. Doppler radar da ta from three other aircraft help the result's interpretation, providi ng reflectivity and wind fields. The cloud liquid content seems to be difficult to retrieve. The ice and liquid rain rates are consistent wi th the other data sources: order of magnitude for convective and strat iform regions, presence of ice and liquid precipitation correlated wit h cell structure, and presence of cloud particles in the lighter preci pitating regions. A quantitative comparison is done between the radiom etric rainfall rates and those derived from the Airborne Rain Mapping Radar observations (also on board NASA DC8). There is a good agreement between the two from the statistical point of view (mean and standard deviation values). Moreover, the finescale rain structures that appea r in radar results are rather well reproduced in the radiometric resul ts. The importance of the new drop size distribution introduced in the radiative transfer model is emphasized by this last comparison.