Sea Ice Acidity and the Formation of Aerosolizable Particles through Sea Ice Sublimation ...
<!--!introduction!--> The acidity of sea ice and sea ice aerosols plays a key role in the reactivity of the cryosphere, leading to or mediating processes such as the oxidation of bromine, which results in tropospheric ozone depletion events. We performed laboratory experiments to assess the ac...
| Main Authors: | , , , , , , |
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| Format: | Conference Object |
| Language: | English |
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GFZ German Research Centre for Geosciences
2023
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.57757/iugg23-3345 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019641 |
| Summary: | <!--!introduction!--> The acidity of sea ice and sea ice aerosols plays a key role in the reactivity of the cryosphere, leading to or mediating processes such as the oxidation of bromine, which results in tropospheric ozone depletion events. We performed laboratory experiments to assess the acidity and subsequently used an environmental scanning electron microscope to observe the particles that emanate from the sublimating sea ices. For the acidity assessment, we propose a spectrophotometric method based on sulfonephthalein indicators employed in the frozen state. The diffuse reflectance UV-Vis approach thus allows estimating the local acidity at the level of molecular interactions and at environmentally relevant temperatures. Our results show a strong freezing-induced acidity increase in sea water, especially as regards solutions of low salinity. Importantly, the microscopic observation of sea ice sublimation revealed a major dependence of the temperature and concentration on the emanating ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ... |
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