Oxidative Processing Lowers the Ice Nucleation Activity of Birch and Alder Pollen
Abstract Pollen carry water extractable compounds with ice nucleating (IN) activity. This study investigates whether the hydroxyl radical, as the major atmospheric oxidant, can affect the IN activity of silver birch and grey alder subpollen particles under in‐cloud conditions for deposition freezing...
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| Format: | Article |
| Language: | English |
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Wiley
2018-02-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2017GL076357 |
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| author | Ellen Gute Jonathan P. D. Abbatt |
| author_facet | Ellen Gute Jonathan P. D. Abbatt |
| author_sort | Ellen Gute |
| collection | DOAJ |
| description | Abstract Pollen carry water extractable compounds with ice nucleating (IN) activity. This study investigates whether the hydroxyl radical, as the major atmospheric oxidant, can affect the IN activity of silver birch and grey alder subpollen particles under in‐cloud conditions for deposition freezing mode conditions at 234 K. It is found that oxidation increases the supersaturation ratio with respect to ice necessary for the onset of ice nucleation and decreases the fraction of particles which initiate ice nucleation. This reduction of IN activity under equivalent oxidation conditions does not occur with a mineral dust sample (Arizona Test Dust). Chemical analysis of fresh and oxidized pollen material indicates a change of molecular structure with a loss of conjugation and an increase in oxidized functional groups, such as carbonyls. This is the first demonstration that in‐cloud oxidation may lower the IN abilities of biological particles such as pollen. |
| format | Article |
| id | doaj-art-bae5bbc092cb44f08cee91ebe404bf8f |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2018-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-bae5bbc092cb44f08cee91ebe404bf8f2025-08-20T03:49:46ZengWileyGeophysical Research Letters0094-82761944-80072018-02-014531647165310.1002/2017GL076357Oxidative Processing Lowers the Ice Nucleation Activity of Birch and Alder PollenEllen Gute0Jonathan P. D. Abbatt1Department of Chemistry University of Toronto Toronto Ontario CanadaDepartment of Chemistry University of Toronto Toronto Ontario CanadaAbstract Pollen carry water extractable compounds with ice nucleating (IN) activity. This study investigates whether the hydroxyl radical, as the major atmospheric oxidant, can affect the IN activity of silver birch and grey alder subpollen particles under in‐cloud conditions for deposition freezing mode conditions at 234 K. It is found that oxidation increases the supersaturation ratio with respect to ice necessary for the onset of ice nucleation and decreases the fraction of particles which initiate ice nucleation. This reduction of IN activity under equivalent oxidation conditions does not occur with a mineral dust sample (Arizona Test Dust). Chemical analysis of fresh and oxidized pollen material indicates a change of molecular structure with a loss of conjugation and an increase in oxidized functional groups, such as carbonyls. This is the first demonstration that in‐cloud oxidation may lower the IN abilities of biological particles such as pollen.https://doi.org/10.1002/2017GL076357ice nucleating particlepollenice cloudsoxidationin‐cloudhydroxyl radical |
| spellingShingle | Ellen Gute Jonathan P. D. Abbatt Oxidative Processing Lowers the Ice Nucleation Activity of Birch and Alder Pollen Geophysical Research Letters ice nucleating particle pollen ice clouds oxidation in‐cloud hydroxyl radical |
| title | Oxidative Processing Lowers the Ice Nucleation Activity of Birch and Alder Pollen |
| title_full | Oxidative Processing Lowers the Ice Nucleation Activity of Birch and Alder Pollen |
| title_fullStr | Oxidative Processing Lowers the Ice Nucleation Activity of Birch and Alder Pollen |
| title_full_unstemmed | Oxidative Processing Lowers the Ice Nucleation Activity of Birch and Alder Pollen |
| title_short | Oxidative Processing Lowers the Ice Nucleation Activity of Birch and Alder Pollen |
| title_sort | oxidative processing lowers the ice nucleation activity of birch and alder pollen |
| topic | ice nucleating particle pollen ice clouds oxidation in‐cloud hydroxyl radical |
| url | https://doi.org/10.1002/2017GL076357 |
| work_keys_str_mv | AT ellengute oxidativeprocessinglowerstheicenucleationactivityofbirchandalderpollen AT jonathanpdabbatt oxidativeprocessinglowerstheicenucleationactivityofbirchandalderpollen |