LONG-TERM GOALS The long-term goal of this work is to understand the sources and nature of marine aerosol particles and how they influence visibility, cloud properties, the thermodynamic structure of the marine boundary layer, and the transmission of radiation. OBJECTIVES The objectives of this project extend across three areas: (i) advancing aerosol measurement techniques via the development of new instrumentation to quantify aerosol-water interactions and drop residual particle properties;

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... ) improving knowledge and model predictions related to the physicochemical nature of aerosol particles and ocean-aerosol-cloud-precipitation-radiation interactions; and (iii) strengthening a research methodology leveraging multiple complementary tools of analysis to guide future studies of this nature in the marine atmosphere. APPROACH The main technical approach is to use a combination of in-situ aircraft measurements, cloud models, and satellite remote sensing data to study the nature and character of aerosols and their effects in the marine atmosphere over a broad range of spatial and temporal scales. The work during the last year included the following tasks: • Characterize and conduct airborne measurements with a state-of-the-art instrument to quantify aerosol-water interactions, termed the differential aerosol sizing and hygroscopicity spectrometer probe (DASH-SP). • Develop, characterize, and conduct airborne measurements with a new aircraft inlet, called the counterflow virtual impactor (CVI), to preferentially sample only drop residual particles when flying in clouds. This work was possible because of an ONR DURIP award (N00014-11-1-0783). This new inlet directly complements the research objectives associated with the ONR YIP award (N00014-10-1-0811). • Use satellite remote sensing observations to study aerosol-cloud-precipitation-radiation interactions in the marine atmosphere.