The Aerosol First Indirect Effect is a theoretical reduction in the radii of cloud droplets that occurs when the number of natural or anthropogenic cloud condensation nuclei is increased while the cloud liquid water content is held constant. This reduction in the droplet radii may substantially increase the solar reflectivity of the clouds and its occurrence on a global scale may, by some estimates, substantially offset the observed warming due to greenhouse gas accumulation. There is circumstantial evidence to support its manifestation in real clouds, most of which is heavily subsidized by proxy measurements, but a process-level understanding and its global radiative impacts are highly uncertain. In this seminar, I introduce a new technique based on in-situ and surface based remote sensors that uses no measurement proxies and enables a true assessment of the actual implementation of the Aerosol First Indirect Effect in real clouds. I apply the technique to coastal stratus clouds, where a wide range of aerosol loadings are observed, and demonstrate that the Aerosol First Indirect Effect is not implemented uniformly across all cloud liquid water contents. My results suggest that the "one-third power law," which is currently used in many Global Climate Models to simulate the radiative effects of clouds, must be modified to account for in-cloud mixing and drizzle, and that it must be selectively applied in coastal regions, and perhaps, beyond.