Title How important is biological ice nucleation in clouds on a global scale?
Author Hoose, C.; Kristjansson, J.E.; Burrows, S.M.
Author Affil Hoose, C., University of Oslo, Department of Geosciences, Oslo, Norway. Other: Karlsruhe Institute of Technology, Germany; Max Planck Institute for Chemistry, Germany
Source Environmental Research Letters, 5(2), Citation 024009. Publisher: Institute of Physics and IOP Publishing, Bristol, United Kingdom. ISSN: 1748-9326
Publication Date 2010
Notes In English. 43 refs. GeoRef Acc. No: 310054
Index Terms aerosols; precipitation (meteorology); bacteria; climate; clouds (meteorology); ecology; fungi; ice; meteorology; models; nucleation; nucleation rate; pollen; simulation; environment simulation; snow; air; atmospheric precipitation; biogenic processes; clouds; global; heterogeneous materials; laboratory studies; miospores; palynomorphs; rates; spores
Abstract The high ice nucleating ability of some biological particles has led to speculations about living and dead organisms being involved in cloud ice and precipitation formation, exerting a possibly significant influence on weather and climate. In the present study, the role of primary biological aerosol particles (PBAPs) as heterogeneous ice nuclei is investigated with a global model. Emission parametrizations for bacteria, fungal spores and pollen based on recent literature are introduced, as well as an immersion freezing parametrization based on classical nucleation theory and laboratory measurements. The simulated contribution of PBAPs to the global average ice nucleation rate is only 10-5%, with an uppermost estimate of 0.6%. At the same time, observed PBAP concentrations in air and biological ice nucleus concentrations in snow are reasonably well captured by the model. This implies that 'bioprecipitation' processes (snow and rain initiated by PBAPs) are of minor importance on the global scale. Copyright IOP Publishing Ltd
URL http://hdl.handle.net/10.1088/1748-9326/5/2/024009
Publication Type journal article
Record ID 65006798