The FPDR – PDI provides unique cloud microphysical observations of individual cloud drop arrivals allowing for the computation of a variety of microphysical cloud properties including individual drop size, cloud drop number concentration, cloud drop size distributions, liquid water content, and cloud thickness. The FPDR – PDI measurement technique also provides droplet spacing and drop velocity information which is used to investigate turbulence and entrainment mixing processes.
We first investigate MSc properties as a function of altitude in cloud based on “sawtooth” flight patterns. This provides insight into the vertical structure of the MSc under a variety of conditions. With these “sawtooths” we can determine how drop sizes, drop size distributions, and liquid water content change with altitude in cloud. We can then consider cloud structure as a function of latitude and longitude to determine how distance from the coast, the source of biomass burning, and other factors such as SST are related to cloud properties. Secondly, we use aerosol information such as average background aerosol amount (low, mid, high) and location relative to cloud (above or mixing) to sort FPDR – PDI cloud properties. To control for meteorological co-variances we further sort the data within aerosol categories by lower tropospheric stability, vertical velocity, and surface wind direction. We then determine general marine stratocumulus cloud characteristics under each of the various aerosol categories to investigate ACI in the SEA.