The Interaction of Water and Aerosols in the Marine Boundary Layer: A Study of Selected Processes Impacting Radiative Transfer and Cloudiness
WASHINGTON UNIV SEATTLE DEPT OF ATMOSPHERIC SCIENCES
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The overarching, long-term goal of the study is to explore the profound effect of aerosol-water interaction both on radiation propagation in, and the thermodynamic structure of, the marine boundary layer. Specific goals are 1 compile a climatology of aerosol hygroscopicity for use in the NAAPS and COAMPS models, and, further, to develop a model parameterization of hygroscopicity based on aerosol size and composition for such models, 2 explore the relative impacts of cross-inversion mixing and sub-cloud aerosol on cloud thickness and cloud base height, 3 quantify and parameterize the impact of precipitation scavenging on below cloud radiative transfer and cloud liquid water path. The sampling platform utilized is the CIRPAS Twin Otter research aircraft and the venue is the littoral environment off the California coast, representative of areas with high shipping densities. For the current reporting period, our efforts have centered on completing several different analyses utilizing data both from the various CARMA studies, the VOCALS study and additional studies such as SAFARI and DYCOMS, the precise suite of data bases being dependent on the specific analysis. Our objectives for these analyses have changed from those in our original proposal several times, guided by our ongoing analysis.