Ice nuclei in marine air: biogenic particles or dust? 1Max Planck Institute for Chemistry, Mainz, Germany
11 Jan 2013
2Institute for Meteorology and Climate Research – Atmospheric Aerosol Research, Karlsruhe Institute of Technology, Karlsruhe, Germany
*now at: Pacific Northwest National Laboratory, Richland, Washington, USA
**now at: Institute for Advanced Sustainability Studies e.V., Potsdam, Germany
Received: 11 January 2012 – Published in Atmos. Chem. Phys. Discuss.: 07 February 2012 Abstract. Ice nuclei impact clouds, but their sources and
distribution in the atmosphere are still not well known.
Particularly little attention has been paid to IN sources in marine
environments, although evidence from field studies suggests that IN
populations in remote marine regions may be dominated by primary
biogenic particles associated with sea spray. In this exploratory
model study, we aim to bring attention to this long-neglected topic
and identify promising target regions for future field campaigns.
We assess the likely global distribution of marine biogenic ice
nuclei using a combination of historical observations, satellite
data and model output. By comparing simulated marine biogenic
immersion IN distributions and dust immersion IN distributions, we
predict strong regional differences in the importance of marine
biogenic IN relative to dust IN. Our analysis suggests that marine
biogenic IN are most likely to play a dominant role in determining
IN concentrations in near-surface-air over the Southern Ocean, so
future field campaigns aimed at investigating marine biogenic IN
should target that region. Climate-related changes in the abundance
and emission of biogenic marine IN could affect marine cloud
properties, thereby introducing previously unconsidered feedbacks
that influence the hydrological cycle and the Earth's energy
balance. Furthermore, marine biogenic IN may be an important aspect
to consider in proposals for marine cloud brightening by artificial
sea spray production.
Revised: 21 November 2012 – Accepted: 27 December 2012 – Published: 11 January 2013
Citation: Burrows, S. M., Hoose, C., Pöschl, U., and Lawrence, M. G.: Ice nuclei in marine air: biogenic particles or dust?, Atmos. Chem. Phys., 13, 245-267, doi:10.5194/acp-13-245-2013, 2013.