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Southern Ocean cloud properties derived from CAPRICORN and MARCUS data

Citation

Mace, GG and Protat, A and Humphries, RS and Alexander, SP and McRobert, IM and Ward, J and Selleck, P and Keywood, M and McFarquhar, GM, Southern Ocean cloud properties derived from CAPRICORN and MARCUS data, Journal of Geophysical Research: Atmospheres, 126, (4) Article e2020JD033368. ISSN 2169-897X (2021) [Refereed Article]


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DOI: doi:10.1029/2020JD033368

Abstract

The properties of Southern Ocean (SO) liquid phase non precipitating clouds (hereafter clouds) are examined using shipborne data collected during the Measurements of Aerosols, Radiation and Clouds over the Southern Ocean and the Clouds Aerosols Precipitation Radiation and atmospheric Composition Over the SoutheRN ocean I and II campaigns that took place south of Australia during Autumn 2016 and Summer 20172018. Cloud properties are derived using data from W-band radars, lidars, and microwave radiometers using an optimal estimation algorithm. The SO clouds tended to have larger liquid water paths (LWP, 115  117 g m−2), smaller effective radii (re, 8.7  3 μm), and higher number concentrations (Nd, 90  107 cm−3) than typical values of eastern ocean basin stratocumulus. The clouds demonstrated a tendency for the LWP to increase with Nd presumably due to precipitation suppression up to Nd of approximately 100 cm−3 when mean LWP decreased with increasing Nd. Due to higher optical depth, cloud albedos were less susceptible to changes in Nd compared to subtropical stratocumulus. The highest latitude clouds of the datasets, observed along and near the Antarctic coast, presented a distinctly bimodal character. One mode had the properties of marine clouds further north. The other mode occurred in an aerosol environment characterized by high cloud condensation nuclei concentrations and elevated sulfate aerosol without obvious continental aerosol markers. These regions of higher cloud condensation nuclei tended to have higher Nd, smaller re and higher LWP suggesting sensitivity of cloud properties to seasonal biogenic aerosol production in the high latitude SO.

Item Details

Item Type:Refereed Article
Keywords:Southern Ocean, cloud properties
Research Division:Earth Sciences
Research Group:Atmospheric sciences
Research Field:Meteorology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the environmental sciences
UTAS Author:Protat, A (Dr Alain Protat)
UTAS Author:Alexander, SP (Dr Simon Alexander)
ID Code:150459
Year Published:2021
Web of Science® Times Cited:8
Deposited By:Australian Antarctic Program Partnership
Deposited On:2022-06-16
Last Modified:2022-06-16
Downloads:0

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