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Observations of ice nucleating particles over Southern Ocean waters

Citation

McCluskey, CS and Hill, TCJ and Humphries, RS and Rauker, AM and Moreau, S and Strutton, PG and Chambers, SD and Williams, AG and McRobert, I and Ward, J and Keywood, MD and Harnwell, J and Ponsonby, W and Loh, ZM and Krummel, PB and Protat, A and Kreidenweis, SM and DeMott, PJ, Observations of ice nucleating particles over Southern Ocean waters, Geophysical Research Letters, 45, (21) pp. 11,989-11,997. ISSN 0094-8276 (2018) [Refereed Article]


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Copyright Statement

2018. American Geophysical Union

DOI: doi:10.1029/2018GL079981

Abstract

A likely important feature of the poorly understood aerosol‐cloud interactions over the Southern Ocean (SO) is the dominant role of sea spray aerosol, versus terrestrial aerosol. Ice nucleating particles (INPs), or particles required for heterogeneous ice nucleation, present over the SO have not been studied in several decades. In this study, boundary layer aerosol properties and immersion freezing INP number concentrations (nINPs) were measured during a ship campaign that occurred south of Australia (down to 53 S) in March‐April 2016. Ocean surface chlorophyll‐a concentrations ranged from 0.11‐1.77 mg m‐3 and nINPs were a factor of 100 lower than historical surveys, ranging from 0.38 to 4.6 m‐3 at ‐20 C. The INP population included organic heat‐stable material, with contributions from heat‐labile material. Lower INP source potentials of SO seawater samples compared to Arctic seawater were consistent with lower ice nucleating site densities in this study compared to north Atlantic air masses.

Item Details

Item Type:Refereed Article
Keywords:ice nucleating particles, marine organic aerosol, Southern Ocean
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Oceanography not elsewhere classified
Objective Division:Environment
Objective Group:Other Environment
Objective Field:Marine Oceanic Processes (excl. climate related)
UTAS Author:Moreau, S (Dr Sebastien Moreau)
UTAS Author:Strutton, PG (Associate Professor Peter Strutton)
ID Code:128865
Year Published:2018
Web of Science® Times Cited:1
Deposited By:Oceans and Cryosphere
Deposited On:2018-10-18
Last Modified:2019-02-20
Downloads:2 View Download Statistics

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