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Structure of an Atmospheric River Over Australia and the Southern Ocean: II. Microphysical Evolution
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2020
Source: Journal of Geophysical Research: Atmospheres, 125, e2020JD032514
[PDF-4.01 MB]
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Journal Title:Journal of Geophysical Research: Atmospheres
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NOAA Program & Office:
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Description:An atmospheric river affecting Australia and the Southern Ocean on 28–29 January 2018 during the Southern Ocean Clouds, Radiation, Aerosol Transport Experimental Study (SOCRATES) is analyzed using nadir-pointing W-band cloud radar measurements and in situ microphysical measurements from a Gulfstream-V aircraft. The AR had a two-band structure, with the westernmost band associated with a cold frontal boundary. The bands were primarily stratiform with distinct radar bright banding. The microphysical evolution of precipitation is described in the context of the tropical- and midlatitude-sourced moisture zones above and below the 0°C isotherm, respectively, identified in Part I. In the tropical-sourced moisture zone, ice particles at temperatures less than −8°C had concentrations on the order of 10 L−1, with habits characteristic of lower temperatures, while between −8°C and −4°C, an order of magnitude increase in ice particle concentrations was observed, with columnar habits consistent with Hallett-Mossop secondary ice formation. Ice particles falling though the 0°C level into the midlatitude-sourced moisture region and melting provided “seed” droplets from which subsequent growth by collision-coalescence occurred. In this region, raindrops grew to sizes of 3 mm and precipitation rates averaged 16 mm hr−1.
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Source:Journal of Geophysical Research: Atmospheres, 125, e2020JD032514
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Rights Information:Other
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Compliance:Submitted
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Main Document Checksum:urn:sha256:99d1d3046ff957245961cc087a25ae43c7a5aa93277dfba7bd1ca5663efa3913
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