A multi-platform analysis of the precipitation susceptibility of warm clouds

It is generally thought that an increase in aerosol particles suppresses precipitation in warm clouds. The nature and magnitude of this effect are highly uncertain owing to numerous microphysical and macrophysical processes that influence clouds over a wide range of spatial and temporal scales. This study addresses the need to improve the evidence for, and quantification of aerosol effects on precipitation using observational data. Previous work introduced the concept of precipitation susceptibility as a metric for changes in precipitation resulting from aerosol perturbations. Motivated by the difficulty in obtaining statistically significant aerosol measurements in the vicinity of clouds, this study explores breaking up the precipitation susceptibility construct into separate components, an aerosol-cloud interaction component and a cloud-precipitation component. These are used to quantify precipitation susceptibility, while accounting for meteorological factors that could obfuscate the response of clouds to aerosol perturbations. The utility of this technique is demonstrated using a diverse set of tools, including data from NASA's A-Train constellation of satellites, aircraft measurements (MASE I/II field campaigns), and models of varying complexity. Employing this method results in increased confidence in causal relationships between aerosol perturbations and precipitation.