4.4 Article

Clouds over the Southern Ocean as Observed from the R/V Investigator during CAPRICORN. Part II: The Properties of Nonprecipitating Stratocumulus

期刊

JOURNAL OF APPLIED METEOROLOGY AND CLIMATOLOGY
卷 57, 期 8, 页码 1805-1823

出版社

AMER METEOROLOGICAL SOC
DOI: 10.1175/JAMC-D-17-0195.1

关键词

Cloud cover; Cloud microphysics; Cloud radiative effects; Cloud retrieval

资金

  1. CSIRO Marine National Facility (MNF)
  2. NASA Grant [NNX13AQ34G]
  3. NASA [NNX13AQ34G, 464871] Funding Source: Federal RePORTER

向作者/读者索取更多资源

The properties of clouds derived from measurements collected using a suite of remote sensors on board the Australian R/V Investigator during a 5-week voyage into the Southern Ocean during March and April 2016 are examined. Based on the findings presented in a companion paper (Part I), we focus our attention on a subset of marine boundary layer (MBL) clouds that form a substantial portion of the cloud-coverage fraction. We find that the MBL clouds that dominate the coverage fraction tend to occur in decoupled boundary layers near the base of marine inversions. The thermodynamic conditions under which these clouds are found are reminiscent of marine stratocumulus studied extensively in the subtropical eastern ocean basins except that here they are often supercooled with a rare presence of the ice phase, quite tenuous in terms of their physical properties, rarely drizzling, and tend to occur in migratory high pressure systems in cold-air advection. We develop a simple cloud property retrieval algorithm that uses as input the lidar-attenuated backscatter, the W-band radar reflectivity, and the 31-GHz brightness temperature. We find that the stratocumulus clouds examined have water paths in the 15-25 g m(-2) range, effective radii near 8 m, and number concentrations in the 20 cm(-3) range in the Southern Ocean with optical depths in the range of 3-4. We speculate that addressing the high bias in absorbed shortwave radiation in climate models will require understanding the processes that form and maintain these marine stratocumulus clouds in southern mid- and high latitudes.

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