Ice surface near melting point: Effects on the tropospheric ice
Atmospheric gases and chemical impurities can be stored and chemically transformed in the tropospheric ice. Impurities are rejected during freezing of the ice to the grain boundaries, free ice surfaces or inclusions. Surface snow and tropospheric ice, however, may be exposed to high temperatures and...
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ftconicet:oai:ri.conicet.gov.ar:11336/184489 2023-10-09T21:55:28+02:00 Ice surface near melting point: Effects on the tropospheric ice Aguirre Varela, Guillermo Gabriel Di Prinzio, Carlos Leonardo Stoler Flores, Damian application/pdf http://hdl.handle.net/11336/184489 eng eng Polish Academy of Sciences. Committee on Polar Research info:eu-repo/semantics/altIdentifier/url/https://journals.pan.pl/dlibra/publication/137144/edition/120127/content info:eu-repo/semantics/altIdentifier/doi/10.24425/ppr.2021.137144 http://hdl.handle.net/11336/184489 Aguirre Varela, Guillermo Gabriel; Di Prinzio, Carlos Leonardo; Stoler Flores, Damian; Ice surface near melting point: Effects on the tropospheric ice; Polish Academy of Sciences. Committee on Polar Research; Polish Polar Research; 42; 4; 10-2021; 237-248 0138-0338 2081-8262 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ AIR-ICE INTERACTION ICE SELF-DIFFUSION COEFFICIENT QUASI-LIQUID LAYER SURFACE TRANSPORT MECHANISMS https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.24425/ppr.2021.137144 2023-09-24T20:22:51Z Atmospheric gases and chemical impurities can be stored and chemically transformed in the tropospheric ice. Impurities are rejected during freezing of the ice to the grain boundaries, free ice surfaces or inclusions. Surface snow and tropospheric ice, however, may be exposed to high temperatures and, eventually, the gases and chemical impurities can be released into the environment. It is important to study the surface structure and transport mechanisms at temperatures near the melting point because the location of impurities and their interactions with water molecules in the ice are not yet sufficiently explained. In this work, the evolution of a scratch on the bicrystalline ice surface was studied at –5℃. The surface transport mechanisms near the melting point were studied and, as a consequence, the surface structure could be determined. An ice sample was kept immersed in ultra-pure silicone oil to prevent evaporation and, thus, isolate the effect of surface diffusion. The ice sample was made with water with chemical conditions similar to the water of polar ice sheets. Photographs of the scratch were taken periodically, for approximately 50 hours, using a photographic camera coupled to an optical microscope. From these images, the evolution of the width of the scratch was studied and the surface diffusion was the dominant transport mechanism in the experiment. Finally, the ice surface self-diffusion coefficient at –5℃ was determined and it was very similar to the super-cooled water diffusion coefficient. A liquid-like behavior of ice surfaces near the melting point was found and it could have a strong influence on the reaction rates with atmospheric gases. Fil: Aguirre Varela, Guillermo Gabriel. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomia y Física. Sección Física. Grupo de Física de la Atmosfera; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Física Enrique Gaviola. Universidad Nacional de Córdoba. ... Article in Journal/Newspaper Polar Research CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Aguirre ENVELOPE(-57.933,-57.933,-63.317,-63.317) Argentina Varela ENVELOPE(-60.583,-60.583,-62.933,-62.933) |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
AIR-ICE INTERACTION ICE SELF-DIFFUSION COEFFICIENT QUASI-LIQUID LAYER SURFACE TRANSPORT MECHANISMS https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
spellingShingle |
AIR-ICE INTERACTION ICE SELF-DIFFUSION COEFFICIENT QUASI-LIQUID LAYER SURFACE TRANSPORT MECHANISMS https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 Aguirre Varela, Guillermo Gabriel Di Prinzio, Carlos Leonardo Stoler Flores, Damian Ice surface near melting point: Effects on the tropospheric ice |
topic_facet |
AIR-ICE INTERACTION ICE SELF-DIFFUSION COEFFICIENT QUASI-LIQUID LAYER SURFACE TRANSPORT MECHANISMS https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
description |
Atmospheric gases and chemical impurities can be stored and chemically transformed in the tropospheric ice. Impurities are rejected during freezing of the ice to the grain boundaries, free ice surfaces or inclusions. Surface snow and tropospheric ice, however, may be exposed to high temperatures and, eventually, the gases and chemical impurities can be released into the environment. It is important to study the surface structure and transport mechanisms at temperatures near the melting point because the location of impurities and their interactions with water molecules in the ice are not yet sufficiently explained. In this work, the evolution of a scratch on the bicrystalline ice surface was studied at –5℃. The surface transport mechanisms near the melting point were studied and, as a consequence, the surface structure could be determined. An ice sample was kept immersed in ultra-pure silicone oil to prevent evaporation and, thus, isolate the effect of surface diffusion. The ice sample was made with water with chemical conditions similar to the water of polar ice sheets. Photographs of the scratch were taken periodically, for approximately 50 hours, using a photographic camera coupled to an optical microscope. From these images, the evolution of the width of the scratch was studied and the surface diffusion was the dominant transport mechanism in the experiment. Finally, the ice surface self-diffusion coefficient at –5℃ was determined and it was very similar to the super-cooled water diffusion coefficient. A liquid-like behavior of ice surfaces near the melting point was found and it could have a strong influence on the reaction rates with atmospheric gases. Fil: Aguirre Varela, Guillermo Gabriel. Universidad Nacional de Córdoba. Facultad de Matemática, Astronomia y Física. Sección Física. Grupo de Física de la Atmosfera; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Física Enrique Gaviola. Universidad Nacional de Córdoba. ... |
format |
Article in Journal/Newspaper |
author |
Aguirre Varela, Guillermo Gabriel Di Prinzio, Carlos Leonardo Stoler Flores, Damian |
author_facet |
Aguirre Varela, Guillermo Gabriel Di Prinzio, Carlos Leonardo Stoler Flores, Damian |
author_sort |
Aguirre Varela, Guillermo Gabriel |
title |
Ice surface near melting point: Effects on the tropospheric ice |
title_short |
Ice surface near melting point: Effects on the tropospheric ice |
title_full |
Ice surface near melting point: Effects on the tropospheric ice |
title_fullStr |
Ice surface near melting point: Effects on the tropospheric ice |
title_full_unstemmed |
Ice surface near melting point: Effects on the tropospheric ice |
title_sort |
ice surface near melting point: effects on the tropospheric ice |
publisher |
Polish Academy of Sciences. Committee on Polar Research |
url |
http://hdl.handle.net/11336/184489 |
long_lat |
ENVELOPE(-57.933,-57.933,-63.317,-63.317) ENVELOPE(-60.583,-60.583,-62.933,-62.933) |
geographic |
Aguirre Argentina Varela |
geographic_facet |
Aguirre Argentina Varela |
genre |
Polar Research |
genre_facet |
Polar Research |
op_relation |
info:eu-repo/semantics/altIdentifier/url/https://journals.pan.pl/dlibra/publication/137144/edition/120127/content info:eu-repo/semantics/altIdentifier/doi/10.24425/ppr.2021.137144 http://hdl.handle.net/11336/184489 Aguirre Varela, Guillermo Gabriel; Di Prinzio, Carlos Leonardo; Stoler Flores, Damian; Ice surface near melting point: Effects on the tropospheric ice; Polish Academy of Sciences. Committee on Polar Research; Polish Polar Research; 42; 4; 10-2021; 237-248 0138-0338 2081-8262 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.24425/ppr.2021.137144 |
_version_ |
1779319383548493824 |