Temperature and concentration affect particle size upon sublimation of saline ice: Implications for sea salt aerosol production in polar regions

Závacká, Kamila; Neděla, Vilém; Olbert, Martin; Tihlaříková, Eva; Vetráková, Ľubica; Yang, Xin ORCID: https://orcid.org/0000-0002-3838-9758; Heger, Dominik. 2022 Temperature and concentration affect particle size upon sublimation of saline ice: Implications for sea salt aerosol production in polar regions. Geophysical Research Letters, 49 (8), e2021GL097098. 10, pp. https://doi.org/10.1029/2021GL097098

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/10.102...

Abstract/Summary

Using an environmental scanning electron microscope, we quantified for the first time aerosol-sized salt particles formed during the sublimation of sea ice as a function of temperature and concentration. The sublimation temperature of the ice is a dominating physical factor to determine the size of the residua: Below −20°C, micron-sized pieces of salt emerge, whereas above the temperature large chunks of salt are detected. Another such aspect influencing the distribution of sizes in salt particles is the concentration: Micron-sized particles are observed exclusively at salinities below 3.5 psu, while below 0.085 psu particles with a median smaller than 6 μm arise from sea ices at any subzero temperature. Moreover, when a chunk of salt sublimes at less than −30°C to be dried and warmed later, a large number of sub-micron crystals will appear. We relate our findings to the production of the polar atmospheric sea salt aerosols.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1029/2021GL097098
ISSN:	0094-8276
Additional Keywords:	sea salt aerosols, ozone depletion, sublimation, microscopy, eutectic temperature, bromine explosion
Date made live:	25 Apr 2022 10:01 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/529876

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1029/2021GL097098

ISSN:

0094-8276

Additional Keywords:

sea salt aerosols, ozone depletion, sublimation, microscopy, eutectic temperature, bromine explosion

Date made live:

25 Apr 2022 10:01 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/529876