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    Thermodynamic and Aerosol Controls in Southeast Pacific Stratocumulus

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    MechemD_JAS_69(4)1250.pdf (3.118Mb)
    Issue Date
    2012-04-01
    Author
    Mechem, David B.
    Yuter, Sandra E.
    de Szoeke, Simon P.
    Publisher
    American Meteorological Society
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
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    Abstract
    A near-large-eddy simulation approach with size-revolving (bin) microphysics is employed to evaluate the relative sensitivity of southeast Pacific marine boundary layer cloud properties to thermodynamic and aerosol parameters. Simulations are based on a heavily drizzling cloud system observed by the NOAA ship Ronald H. Brown during the Variability of the American Monsoon Systems (VAMOS) Ocean–Cloud–Atmosphere–Land Study—Regional Experiment (VOCALS-Rex) field campaign. A suite of numerical experiments examines the sensitivity of drizzle to variations in boundary layer depth and cloud condensation nuclei (CCN) concentration in a manner consistent with the variability of those parameters observed during VOCALS-Rex. All four simulations produce cellular structures and turbulence characteristics of a circulation driven predominantly in a bottom-up fashion. The cloud and subcloud layers are coupled by strong convective updrafts that provide moisture to the cloud layer. Distributions of reflectivity calculated from model droplet spectra agree well with reflectivity distributions from the 5-cm-wavelength scanning radar aboard the ship, and the statistical behavior of cells over the course of the simulation is similar to that documented in previous studies of southeast Pacific stratocumulus. The simulations suggest that increased aerosol concentration delays the onset of drizzle, whereas changes in the boundary layer height are more important in modulating drizzle intensity.
    Description
    This is the publisher's version, also available electronically from http://journals.ametsoc.org/doi/abs/10.1175/JAS-D-11-0165.1.
    URI
    http://hdl.handle.net/1808/15866
    DOI
    https://doi.org/10.1175/JAS-D-11-0165.1
    ISSN
    0022-4928
    Collections
    • Geography & Atmospheric Science Scholarly Works [199]
    Citation
    Mechem, David B.; Yuter, Sandra E.; de Szoeke, Simon P. (2012). "Thermodynamic and Aerosol Controls in Southeast Pacific Stratocumulus." J. Atmos. Sci., 69(4):1250-1266. http://dx.doi.org/10.1175/JAS-D-11-0165.1.

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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