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Observations of low level stratiform clouds made over the Bay of Fundy from 15 August to 26 September 1995, as part of the Radiation, Aerosol, and Cloud Experiment (RACE) are used in this study. Aircraft, LAND Resources SATellite System (LANDSAT), and the Center for Atmospheric Research Experiment (CARE) lidar observations were used to obtain effective radius (rett), droplet number concentration (Nd). and cloud optical thickness (t). Radiation observations with a 28.5 m resolution at six solar reflectance channels from 0.45 μm up to 2.35 μm of the Thematic Mapper (TM) on LANDSAT were used. The 10.4-12.5 μm infrared channel has a field of view of 114 m. The visible extinction coefficient ( crex1) obtained from an aircraft mounted extinction meter was related to both liquid water content (L WC) and Nd. Optical thickness (t) were obtained from LANDSAT observations. Then, Nd, LWC, and reffalong lines of longitude are averaged at about 10 km intervals. The results showed that the relationships obtained between reff and t for stratiform clouds can be used to estimate reff values from satellite derived 't. Key words: Optical thickness, effective radius, extinction coefficient, aircraft and LANDSAT observations
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