The Occurrence Frequency and Properties of Geometrically Thin Stratiform Clouds Associated with Precipitating Shallow Convection over the Southern Ocean

A long-standing bias in general circulation model (GCM) absorbed shortwave radiation has persisted in versions of the leading IPCCC models in the Southern Oceans poleward of about 45 degrees South latitude.  This bias has been linked to a disparity between model predicted cloud cover and the observed occurrence of spatially extended stratiform water clouds. Using a unique data set collected in Austral autumn of 2016 from the Australian Research Vessel Investigator, we evaluate the occurrence frequency of stratiform supercooled liquid and mixed phase water clouds and the occurrence frequency and properties of associated ice phase precipitation.

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