Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 5.414
IF5.414
IF 5-year value: 5.958
IF 5-year
5.958
CiteScore value: 9.7
CiteScore
9.7
SNIP value: 1.517
SNIP1.517
IPP value: 5.61
IPP5.61
SJR value: 2.601
SJR2.601
Scimago H <br class='widget-line-break'>index value: 191
Scimago H
index
191
h5-index value: 89
h5-index89
Volume 11, issue 3
Atmos. Chem. Phys., 11, 1191–1201, 2011
https://doi.org/10.5194/acp-11-1191-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 11, 1191–1201, 2011
https://doi.org/10.5194/acp-11-1191-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 11 Feb 2011

Research article | 11 Feb 2011

The ice nucleation ability of one of the most abundant types of fungal spores found in the atmosphere

R. Iannone1, D. I. Chernoff1, A. Pringle2, S. T. Martin3, and A. K. Bertram1 R. Iannone et al.
  • 1Department of Chemistry, University of British Columbia, Vancouver, British Columbia, V6T 1Z1, Canada
  • 2Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts, USA
  • 3School of Engineering and Applied Sciences & Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts, USA

Abstract. Recent atmospheric measurements show that biological particles are a potentially important class of ice nuclei. Types of biological particles that may be good ice nuclei include bacteria, pollen and fungal spores. We studied the ice nucleation properties of water droplets containing fungal spores from the genus Cladosporium, one of the most abundant types of spores found in the atmosphere. For water droplets containing a Cladosporium spore surface area of ~217 μm2 (equivalent to ~5 spores with average diameters of 3.2 μm ), 1% of the droplets froze by −28.5 °C and 10% froze by –30.1 °C. However, there was a strong dependence on freezing temperature with the spore surface area of Cladosporium within a given droplet. Mean freezing temperatures for droplets containing 1–5 spores are expected to be approximately −35.1 ± 2.3 °C (1σ S. D.). Atmospheric ice nucleation on spores of Cladosporium sp., or other spores with similar surface properties, thus do not appear to explain recent atmospheric measurements showing that biological particles participate as atmospheric ice nuclei. The poor ice nucleation ability of Cladosporium sp. may be attributed to the surface which is coated with hydrophobins (a class of hydrophobic proteins that appear to be widespread in filamentous fungi). Given the ubiquity of hydrophobins on spore surfaces, the current study may be applicable to many fungal species of atmospheric importance.

Publications Copernicus
Download
Citation
Altmetrics
Final-revised paper
Preprint