Cloud Aerosol Research in the Marine Atmosphere (CARMA)
• A multi-year project to look primarily at the interaction of aerosols and clouds in the marine atmosphere.
• A concurrent, ancillary task has been to characterize, both chemically and physically, the aerosols in the MBL
Proposed CARMA-IV Goals
• Hygroscopicity climatology for litoral region
• Assess the relative importance of super-inversion mixing and below cloud aerosol on cloud optical depth
• Assess the impact of precipitation scavenging on MBL aerosol concentration
Potential New Goals
• Assess the importance of EC particles as CCN
• Evaluate the impact of chemistry on aerosol hygroscopicity during vertical transport in the MBL
• Explore relationship between individual particle hygroscopicity and bulk scattering hygroscopicity
Instruments for Proposed Goals
Instruments for Potential Goals
Hygroscopicity Parameters
• For light scattering dependence:
• For particle size dependence:
DHGF’s (wet to dry diameter ratio)
Hygroscopicity data for Climatology
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