Ice-nucleating ability of aerosol particles and possible sources at three coastal marine sites
<p>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 A...
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Copernicus Publications
2018-11-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/18/15669/2018/acp-18-15669-2018.pdf |
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doaj-ea58c391b1d74b4798fd6a07a822d26f2020-11-24T21:07:39ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242018-11-0118156691568510.5194/acp-18-15669-2018Ice-nucleating ability of aerosol particles and possible sources at three coastal marine sitesM. Si0V. E. Irish1R. H. Mason2J. Vergara-Temprado3J. Vergara-Temprado4S. J. Hanna5L. A. Ladino6L. A. Ladino7J. D. Yakobi-Hancock8C. L. Schiller9J. J. B. Wentzell10J. P. D. Abbatt11K. S. Carslaw12B. J. Murray13A. K. Bertram14Department of Chemistry, University of British Columbia, Vancouver, V6T1Z1, CanadaDepartment of Chemistry, University of British Columbia, Vancouver, V6T1Z1, CanadaDepartment of Chemistry, University of British Columbia, Vancouver, V6T1Z1, CanadaInstitute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UKnow at: Institute for Atmospheric and Climate Science, ETH Zürich, Zürich, SwitzerlandDepartment of Chemistry, University of British Columbia, Vancouver, V6T1Z1, CanadaDepartment of Chemistry, University of Toronto, Toronto, M5S3H6, Canadanow at: Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, Ciudad Universitaria, Mexico City, MexicoDepartment of Chemistry, University of Toronto, Toronto, M5S3H6, CanadaAir Quality Science Unit, Environment and Climate Change Canada, Vancouver, V6C3S5, CanadaAir Quality Research Division, Environment and Climate Change Canada, Toronto, M3H5T4, CanadaDepartment of Chemistry, University of Toronto, Toronto, M5S3H6, CanadaInstitute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UKInstitute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UKDepartment of Chemistry, University of British Columbia, Vancouver, V6T1Z1, Canada<p>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). For Amphitrite Point, 23 sets of samples were analyzed, and for Labrador Sea and Lancaster Sound, one set of samples was analyzed for each location. At all three sites, the ice-nucleating ability on a per number basis (expressed as the fraction of aerosol particles acting as an INP) was strongly dependent on the particle size. For example, at diameters of around 0.2 µm, approximately 1 in 10<sup>6</sup> particles acted as an INP at −25 °C, while at diameters of around 8 µm, approximately 1 in 10 particles acted as an INP at −25 °C. The ice-nucleating ability on a per surface-area basis (expressed as the surface active site density, <i>n</i><sub>s</sub>) was also dependent on the particle size, with larger particles being more efficient at nucleating ice. The <i>n</i><sub>s</sub> values of supermicron particles at Amphitrite Point and Labrador Sea were larger than previously measured <i>n</i><sub>s</sub> values of sea spray aerosols, suggesting that sea spray aerosols were 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 °C, but under-predicted INP concentrations at −15 °C, suggesting that the model is missing a source of INPs active at a freezing temperature of −15 °C.</p>https://www.atmos-chem-phys.net/18/15669/2018/acp-18-15669-2018.pdf |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
M. Si V. E. Irish R. H. Mason J. Vergara-Temprado J. Vergara-Temprado S. J. Hanna L. A. Ladino L. A. Ladino J. D. Yakobi-Hancock C. L. Schiller J. J. B. Wentzell J. P. D. Abbatt K. S. Carslaw B. J. Murray A. K. Bertram |
| spellingShingle |
M. Si V. E. Irish R. H. Mason J. Vergara-Temprado J. Vergara-Temprado S. J. Hanna L. A. Ladino L. A. Ladino J. D. Yakobi-Hancock C. L. Schiller J. J. B. Wentzell J. P. D. Abbatt K. S. Carslaw B. J. Murray A. K. Bertram Ice-nucleating ability of aerosol particles and possible sources at three coastal marine sites Atmospheric Chemistry and Physics |
| author_facet |
M. Si V. E. Irish R. H. Mason J. Vergara-Temprado J. Vergara-Temprado S. J. Hanna L. A. Ladino L. A. Ladino J. D. Yakobi-Hancock C. L. Schiller J. J. B. Wentzell J. P. D. Abbatt K. S. Carslaw B. J. Murray A. K. Bertram |
| author_sort |
M. Si |
| title |
Ice-nucleating ability of aerosol particles and possible sources at three coastal marine sites |
| title_short |
Ice-nucleating ability of aerosol particles and possible sources at three coastal marine sites |
| title_full |
Ice-nucleating ability of aerosol particles and possible sources at three coastal marine sites |
| title_fullStr |
Ice-nucleating ability of aerosol particles and possible sources at three coastal marine sites |
| title_full_unstemmed |
Ice-nucleating ability of aerosol particles and possible sources at three coastal marine sites |
| title_sort |
ice-nucleating ability of aerosol particles and possible sources at three coastal marine sites |
| publisher |
Copernicus Publications |
| series |
Atmospheric Chemistry and Physics |
| issn |
1680-7316 1680-7324 |
| publishDate |
2018-11-01 |
| description |
<p>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). For Amphitrite Point, 23 sets of samples were analyzed,
and for Labrador Sea and Lancaster Sound, one set of samples was analyzed for
each location. At all three sites, the ice-nucleating ability on a per number
basis (expressed as the fraction of aerosol particles acting as an INP) was
strongly dependent on the particle size. For example, at diameters of around
0.2 µm, approximately 1 in 10<sup>6</sup> particles acted as an INP
at −25 °C, while at diameters of around 8 µm, approximately
1 in 10 particles acted as an INP at −25 °C. The
ice-nucleating ability on a per surface-area basis (expressed as the surface
active site density, <i>n</i><sub>s</sub>) was also dependent on the particle size,
with larger particles being more efficient at nucleating ice. The <i>n</i><sub>s</sub>
values of supermicron particles at Amphitrite Point and Labrador Sea were
larger than previously measured <i>n</i><sub>s</sub> values of sea spray aerosols,
suggesting that sea spray aerosols were 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 °C, but
under-predicted INP concentrations at −15 °C, suggesting
that the model is missing a source of INPs active at a freezing temperature
of −15 °C.</p> |
| url |
https://www.atmos-chem-phys.net/18/15669/2018/acp-18-15669-2018.pdf |
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