Environmental & Climate Sciences Department Seminar
"Polar Stratiform Mixed-phase Clouds Observed with Remote Sensing Measurements"
Presented by Damao Zhang, Environmental and Climate Sciences Department, Brookhaven National Laboratory
Thursday, February 21, 2019, 11:00 am — Conference Room Bldg 815E
Stratiform mixed-phase clouds are prevalent at high latitudes and greatly impact regional radiative fluxes. Satellite and ground-based remote sensing measurements enable statistical analyses of mixed-phase cloud properties and their underlying processes. A comprehensive database is constructed of retrieved mixed-phase cloud microphysical properties using ground-based remote sensing measurements from the Atmospheric Radiation Measurement Program (ARM) West Antarctic Radiation Experiment (AWARE) campaign at the McMurdo station, and multiple years of measurements at the ARM North Slope of Alaska (NSA) Utqiagvik Facility. The database includes ice and liquid components of water content, average particle size and concentration, and dynamics including vertical air velocity and turbulence. With the database, polar stratiform mixed-phase cloud macro- and microphysical properties are analyzed and compared for the dramatically different environments. In addition, lidar backscattering and polarization measurements are used to study polar aerosol profiles that may impact stratiform mixed-phase cloud microphysical properties through aerosol-cloud interactions. Such long-term remote sensing observations of polar stratiform mixed-phase cloud properties may be used to evaluate and improve model simulations.
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