Glaciochemistry and environmental interpretation of a snow core from West Antarctica
Abstract This study investigated the chemical content of a shallow snow core (4.95 m) named TT 6, collected during a Brazilian traverse of the West Antarctic Ice Sheet in the 2014/2015 Austral summer. Stable isotope ratios (δD and δ18O) and ionic content, determined at the Centro Polar e Climático o...
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Academia Brasileira de Ciências
2024-12-01
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| author | REGINA S. FERREIRA JEFFERSON C. SIMÕES ISAÍAS U. THOEN RONALDO T. BERNARDO |
| author_facet | REGINA S. FERREIRA JEFFERSON C. SIMÕES ISAÍAS U. THOEN RONALDO T. BERNARDO |
| author_sort | REGINA S. FERREIRA |
| collection | DOAJ |
| description | Abstract This study investigated the chemical content of a shallow snow core (4.95 m) named TT 6, collected during a Brazilian traverse of the West Antarctic Ice Sheet in the 2014/2015 Austral summer. Stable isotope ratios (δD and δ18O) and ionic content, determined at the Centro Polar e Climático of the Federal University of Rio Grande do Sul (CPC/UFRGS), were used to date the core and reconstruct the climatic conditions at the site. The core represents approximately 11 years ± 6 months of precipitation, i.e., a mean net snow accumulation rate of 0.19 ± 0.02 m a-1 in water equivalent. Using the non-sea-salt sulfate values, we identified the 2011 Puyhue-Cordón (Chile) volcanic eruption signal, providing a reference horizon for dating. Anions represent 53.73% of the ionic content. We identified that 96.86% of calcium and 84.50% of sulfate are non-sea origin, while the acidic contribution is 25.62% H+. We observed high peaks in marine aerosols containing Na+, Cl-, and Mg2+ during winter, and results from the ERA5 global model (NOAA) indicated that El Niño events could influence Antarctic temperatures, facilitating the transport of marine aerosols to the continent. |
| format | Article |
| id | doaj-art-bfe168b6fcf645c99faa64f888f2d67b |
| institution | OA Journals |
| issn | 1678-2690 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Academia Brasileira de Ciências |
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| series | Anais da Academia Brasileira de Ciências |
| spelling | doaj-art-bfe168b6fcf645c99faa64f888f2d67b2025-08-20T01:57:49ZengAcademia Brasileira de CiênciasAnais da Academia Brasileira de Ciências1678-26902024-12-0196suppl 210.1590/0001-3765202420240243Glaciochemistry and environmental interpretation of a snow core from West AntarcticaREGINA S. FERREIRAhttps://orcid.org/0000-0001-9918-6340JEFFERSON C. SIMÕEShttps://orcid.org/0000-0001-5555-3401ISAÍAS U. THOENhttps://orcid.org/0000-0002-2419-8838RONALDO T. BERNARDOhttps://orcid.org/0000-0002-1143-7916Abstract This study investigated the chemical content of a shallow snow core (4.95 m) named TT 6, collected during a Brazilian traverse of the West Antarctic Ice Sheet in the 2014/2015 Austral summer. Stable isotope ratios (δD and δ18O) and ionic content, determined at the Centro Polar e Climático of the Federal University of Rio Grande do Sul (CPC/UFRGS), were used to date the core and reconstruct the climatic conditions at the site. The core represents approximately 11 years ± 6 months of precipitation, i.e., a mean net snow accumulation rate of 0.19 ± 0.02 m a-1 in water equivalent. Using the non-sea-salt sulfate values, we identified the 2011 Puyhue-Cordón (Chile) volcanic eruption signal, providing a reference horizon for dating. Anions represent 53.73% of the ionic content. We identified that 96.86% of calcium and 84.50% of sulfate are non-sea origin, while the acidic contribution is 25.62% H+. We observed high peaks in marine aerosols containing Na+, Cl-, and Mg2+ during winter, and results from the ERA5 global model (NOAA) indicated that El Niño events could influence Antarctic temperatures, facilitating the transport of marine aerosols to the continent.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652024000401112&lng=en&tlng=enice coreWest Antarcticamajor ionsmarine aerosolGlaciochemistry |
| spellingShingle | REGINA S. FERREIRA JEFFERSON C. SIMÕES ISAÍAS U. THOEN RONALDO T. BERNARDO Glaciochemistry and environmental interpretation of a snow core from West Antarctica Anais da Academia Brasileira de Ciências ice core West Antarctica major ions marine aerosol Glaciochemistry |
| title | Glaciochemistry and environmental interpretation of a snow core from West Antarctica |
| title_full | Glaciochemistry and environmental interpretation of a snow core from West Antarctica |
| title_fullStr | Glaciochemistry and environmental interpretation of a snow core from West Antarctica |
| title_full_unstemmed | Glaciochemistry and environmental interpretation of a snow core from West Antarctica |
| title_short | Glaciochemistry and environmental interpretation of a snow core from West Antarctica |
| title_sort | glaciochemistry and environmental interpretation of a snow core from west antarctica |
| topic | ice core West Antarctica major ions marine aerosol Glaciochemistry |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652024000401112&lng=en&tlng=en |
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