A laboratory investigation of the ice nucleation efficiency of three types of mineral and soil dust
<p>Surface-collected dust from three different locations around the world was examined with respect to its ice nucleation activity (INA) with the ETH Portable Ice Nucleation Chamber (PINC). Ice nucleation experiments were conducted with particles of 200 and 400 nm in diameter in...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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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/18/16515/2018/acp-18-16515-2018.pdf |
| _version_ | 1818082230036070400 |
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| author | M. Paramonov R. O. David R. Kretzschmar Z. A. Kanji |
| author_facet | M. Paramonov R. O. David R. Kretzschmar Z. A. Kanji |
| author_sort | M. Paramonov |
| collection | DOAJ |
| description | <p>Surface-collected dust from three different locations around the world was
examined with respect to its ice nucleation activity (INA) with the ETH
Portable Ice Nucleation Chamber (PINC). Ice nucleation experiments were conducted with particles of 200
and 400 nm in diameter in the temperature range of 233–243 K in both the
deposition nucleation and condensation freezing regimes. Several treatments
were performed in order to investigate the effect of mineralogical
composition, as well as the presence of biological and proteinaceous, organic
and soluble compounds on the INA of mineral and soil dust. The INA of
untreated dust particles correlated well with the total feldspar and
K-feldspar content, corroborating previously published results. The removal
of heat-sensitive proteinaceous and organic components from the particle
surface with heat decreased the INA of dusts. However, the decrease in the
INA was not proportional to the amount of these organic components,
indicating that different proteinaceous and organic species have different
ice nucleation activities, and the exact speciation is required in order to
determine why dusts respond differently to the heating process. The INA of
certain dusts increased after the removal of soluble material from the
particle surface, demonstrating the low INA of the soluble compounds and/or
the exposition of the underlying active sites. Similar to the proteinaceous
organic compounds, soluble compounds seem to have different effects on the
INA of surface-collected dusts, and a general conclusion about how the
presence of soluble material on the particle surface affects its INA is not
possible. The investigation of the heated and washed dusts revealed that
mineralogy alone is not able to fully explain the observed INA of
surface-collected dusts at the examined temperature and relative humidity
conditions. The results showed that it is not possible to predict the INA of
surface-collected soil dust based on the presence and amount of certain
minerals or any particular class of compounds, such as soluble or
proteinaceous/organic compounds. Instead, at temperatures of 238–243 K the
INA of the untreated, surface-collected soil dust in the condensation
freezing mode can be roughly approximated by one of the existing surrogates
for atmospheric mineral dust, such as illite NX. Uncertainties associated
with mechanical damage and possible changes to the mineralogy during
treatments, as well as with the BET surface area and its immediate impact on
the number of active sites (<i>n</i><sub>s, BET</sub>), are addressed.</p> |
| first_indexed | 2024-12-10T19:18:47Z |
| format | Article |
| id | doaj.art-905f2719c4924cb79addecf43555aa9d |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-10T19:18:47Z |
| publishDate | 2018-11-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-905f2719c4924cb79addecf43555aa9d2022-12-22T01:36:32ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242018-11-0118165151653610.5194/acp-18-16515-2018A laboratory investigation of the ice nucleation efficiency of three types of mineral and soil dustM. Paramonov0R. O. David1R. Kretzschmar2Z. A. Kanji3Institute for Atmospheric and Climate Science, ETH Zürich, Zürich, SwitzerlandInstitute for Atmospheric and Climate Science, ETH Zürich, Zürich, SwitzerlandInstitute of Biogeochemistry and Pollutant Dynamics, ETH Zürich, Zürich, SwitzerlandInstitute for Atmospheric and Climate Science, ETH Zürich, Zürich, Switzerland<p>Surface-collected dust from three different locations around the world was examined with respect to its ice nucleation activity (INA) with the ETH Portable Ice Nucleation Chamber (PINC). Ice nucleation experiments were conducted with particles of 200 and 400 nm in diameter in the temperature range of 233–243 K in both the deposition nucleation and condensation freezing regimes. Several treatments were performed in order to investigate the effect of mineralogical composition, as well as the presence of biological and proteinaceous, organic and soluble compounds on the INA of mineral and soil dust. The INA of untreated dust particles correlated well with the total feldspar and K-feldspar content, corroborating previously published results. The removal of heat-sensitive proteinaceous and organic components from the particle surface with heat decreased the INA of dusts. However, the decrease in the INA was not proportional to the amount of these organic components, indicating that different proteinaceous and organic species have different ice nucleation activities, and the exact speciation is required in order to determine why dusts respond differently to the heating process. The INA of certain dusts increased after the removal of soluble material from the particle surface, demonstrating the low INA of the soluble compounds and/or the exposition of the underlying active sites. Similar to the proteinaceous organic compounds, soluble compounds seem to have different effects on the INA of surface-collected dusts, and a general conclusion about how the presence of soluble material on the particle surface affects its INA is not possible. The investigation of the heated and washed dusts revealed that mineralogy alone is not able to fully explain the observed INA of surface-collected dusts at the examined temperature and relative humidity conditions. The results showed that it is not possible to predict the INA of surface-collected soil dust based on the presence and amount of certain minerals or any particular class of compounds, such as soluble or proteinaceous/organic compounds. Instead, at temperatures of 238–243 K the INA of the untreated, surface-collected soil dust in the condensation freezing mode can be roughly approximated by one of the existing surrogates for atmospheric mineral dust, such as illite NX. Uncertainties associated with mechanical damage and possible changes to the mineralogy during treatments, as well as with the BET surface area and its immediate impact on the number of active sites (<i>n</i><sub>s, BET</sub>), are addressed.</p>https://www.atmos-chem-phys.net/18/16515/2018/acp-18-16515-2018.pdf |
| spellingShingle | M. Paramonov R. O. David R. Kretzschmar Z. A. Kanji A laboratory investigation of the ice nucleation efficiency of three types of mineral and soil dust Atmospheric Chemistry and Physics |
| title | A laboratory investigation of the ice nucleation efficiency of three types of mineral and soil dust |
| title_full | A laboratory investigation of the ice nucleation efficiency of three types of mineral and soil dust |
| title_fullStr | A laboratory investigation of the ice nucleation efficiency of three types of mineral and soil dust |
| title_full_unstemmed | A laboratory investigation of the ice nucleation efficiency of three types of mineral and soil dust |
| title_short | A laboratory investigation of the ice nucleation efficiency of three types of mineral and soil dust |
| title_sort | laboratory investigation of the ice nucleation efficiency of three types of mineral and soil dust |
| url | https://www.atmos-chem-phys.net/18/16515/2018/acp-18-16515-2018.pdf |
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