Characteristics of the cold-air outbreak cloud regime over the Southern Ocean, as observed in MARCUS
Authors
Yazhe Hu — university of wyoming
Yonggang Wang — State University of New York, Oswego
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Bart Geerts — Department of Atmospheric Science, University of Wyoming
Category
High-latitude clouds and aerosols
Description
The cold-air outbreak (CAO) cloud regime has been documented mainly in the northern hemisphere. This poster will document the CAO cloud regime over the Southern Ocean with data collected by the ARM Mobile Facility (AMF2) in the MARCUS (Measurements of Aerosols, Radiation, and Clouds over the Southern Ocean) campaign, which operated from early November, 2017 to late March, 2018. The AMF2 was installed on the vessel Aurora Australis (AA) as it traveled between Hobart, Australia, and the Antarctic coast. We use data from radiosondes, micropulse lidar, microwave radiometer, Ka-band and W-band (95 GHz) scanning and profiling cloud radar, ceilometer, downwelling radiometers, as well as ERA-5 and satellite imagery. Other than primary datasets, we also examine value-added products, such as LWP, IWP, effective droplet size, and effective ice particle size. We are interested in the vertical structure of stability and wind shear, vertical velocity, clouds, and precipitation, in the context of satellite-observed cloud macrostructure. We start with a case study, and expand this to a composite study for all CAOs during MARCUS. We use this to explore the linkages between surface temperature, wind speed, MBL vertical structure, MBL mesoscale organization, and cloud/precipitation characteristics such as liquid/ice partitioning and surface precipitation rate. In follow-up work, these linkages (correlations) will be compared against those obtained from well-constrained numerical simulations.
