Characterization of Aerosol Hygroscopicity Over the Northeast Pacific Ocean: Impacts on Prediction of CCN and Stratocumulus Cloud Droplet Number Concentrations.

ABSTRACT: During the Marine Aerosol Cloud and Wildfire Study (MACAWS) in June and July of 2018, aerosol composition and cloud condensation nuclei (CCN) properties were measured over the N.E. Pacific to characterize the influence of aerosol hygroscopicity on predictions of ambient CCN and stratocumulus cloud droplet number concentrations (CDNC). Three vertical regions were characterized, corresponding to the marine boundary layer (MBL), an above-cloud organic aerosol layer (AC-OAL), and the free troposphere (FT) above the AC-OAL. The aerosol hygroscopicity parameter (κ) was calculated from CCN measurements (κ _CCN) and bulk aerosol mass spectrometer (AMS) measurements (κ _AMS). Within the MBL, measured hygroscopicities varied between values typical of both con

SUBMITTER: Schulze BC 

PROVIDER: S-EPMC7676499 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature