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Ice-nucleating efficiency of aerosol particles and possible sources at three coastal marine sites
| Content Provider | Scilit |
|---|---|
| Author | Si, Meng Irish, Victoria E. Mason, Ryan H. Vergara-Temprado, Jesús Hanna, Sarah Ladino, Luis A. Yakobi-Hancock, Jacqueline D. Schiller, Corinne L. Wentzell, Jeremy J. B. Abbatt, Jonathan P. D. Carslaw, Ken S. Murray, Benjamin J. Bertram, Allan K. |
| Copyright Year | 2018 |
| Description | Despite the importance of ice-nucleating particles (INPs) for climate and precipitation, our understanding of these particles is far from complete. Here, we investigated INPs at three coastal marine sites in Canada, two at mid-latitude (Amphitrite Point and Labrador Sea), and one in the Arctic (Lancaster Sound). At all three sites, the ice-nucleating efficiency on a per number basis (expressed as the fraction of aerosol particles acting as an INP) was strongly dependent on the size. For example, at diameters of around 0.2 µm, approximately 1 in 106 particles acted as an INP at −25 ºC, while at diameters of around 8 µm, approximately 1 in 10 particles acted as an INP at −25 ºC. The ice-nucleating efficiency on a per surface area basis (expressed as the surface active site density, ns) was also dependent on the size, with larger particles being more efficient at nucleating ice. The ns values of supermicron particles at Amphitrite Point and Labrador Sea were larger than previously measured ns values of sea spray aerosol, suggesting that sea spray aerosol was not a major contributor to the supermicron INP population at these two sites. Consistent with this observation, a global model of INP concentrations under-predicted the INP concentrations when assuming only marine organics as INPs. On the other hand, assuming only K-feldspar as INPs, the same model was able to reproduce the measurements at a freezing temperature of −25 ºC, but under-predicted INP concentrations at −15 ºC, suggesting that the model is missing a source of INPs active at a freezing temperature of −15 ºC. |
| DOI | 10.5194/acp-2018-81 |
| Volume Number | 2018 |
| Language | English |
| Publisher | Copernicus GmbH |
| Publisher Date | 2018-03-05 |
| Access Restriction | Open |
| Subject Keyword | Atmospheric Sciences Ice Nucleating |
| Content Type | Text |
| Resource Type | Article |
