Stable-isotope ratios (δ18O and δD) in a firn core from West Antarctica
Abstract A 22.48 m long ice core (BR-IC-4) was collected in the West Antarctic Ice Sheet (at 83°58’59.4” S, 80°07’01.4” W, 1,295 m above the sea level) during the Austral summer of 2004–2005, as a contribution to the International Trans-Antarctic Expedition program. The isotopic composition (δD and...
Published in: | Anais da Academia Brasileira de Ciências |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Academia Brasileira de Ciências
2023
|
Subjects: | |
Online Access: | https://doi.org/10.1590/0001-3765202320230132 https://doaj.org/article/e5871c23d6b243199f7c84838e8df983 |
id |
ftdoajarticles:oai:doaj.org/article:e5871c23d6b243199f7c84838e8df983 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:e5871c23d6b243199f7c84838e8df983 2024-01-21T10:01:44+01:00 Stable-isotope ratios (δ18O and δD) in a firn core from West Antarctica MANOELA B.P. PORTELLA JEFFERSON C. SIMÕES RONALDO T. BERNARDO JOÃO G. ILHA GINO CASASSA 2023-12-01T00:00:00Z https://doi.org/10.1590/0001-3765202320230132 https://doaj.org/article/e5871c23d6b243199f7c84838e8df983 EN eng Academia Brasileira de Ciências http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652023000601115&lng=en&tlng=en http://www.scielo.br/pdf/aabc/v95s3/0001-3765-aabc-95-s3-e20230132.pdf https://doaj.org/toc/1678-2690 1678-2690 doi:10.1590/0001-3765202320230132 https://doaj.org/article/e5871c23d6b243199f7c84838e8df983 Anais da Academia Brasileira de Ciências, Vol 95, Iss suppl 3 (2023) Antarctica firn core glaciology stable isotopes Science Q article 2023 ftdoajarticles https://doi.org/10.1590/0001-3765202320230132 2023-12-24T01:45:06Z Abstract A 22.48 m long ice core (BR-IC-4) was collected in the West Antarctic Ice Sheet (at 83°58’59.4” S, 80°07’01.4” W, 1,295 m above the sea level) during the Austral summer of 2004–2005, as a contribution to the International Trans-Antarctic Expedition program. The isotopic composition (δD and δ18O) of 599 samples, corresponding to the upper 12.98 m of the ice core, was determined by gas source mass spectrometry and cavity ring-down spectroscopy. Relative dating was based on the isotopic ratios and major ions (MS-, Na+, nssSO4 2-) and trace elements (Na, S, Sr) concentrations. The record covers approximately 13 years – from 1990 to 2003. The mean accumulation rate of 0.48 ± 0.09 m water equivalent per year (m eq H2O a1) is relatively high for the geographical area and possibly results from snowdrifting from near areas, as attested by ice glaze surfaces in other sites in the region. The stable isotope δD content varies between -367.90‰ and 256.30‰ (mean -314.42 ± 19.01‰); and δ18O ranges from -44.96‰ to 35.08‰ (mean -39.95 ± 2.05‰). Deuterium excess values (mean 3.70 ± 1.54‰) indicate episodic intense oceanic evaporation and high relative humidity in the moisture sources. Article in Journal/Newspaper Antarc* Antarctic Antarctica ice core Ice Sheet West Antarctica Directory of Open Access Journals: DOAJ Articles Antarctic Austral West Antarctic Ice Sheet West Antarctica Anais da Academia Brasileira de Ciências 95 suppl 3 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctica firn core glaciology stable isotopes Science Q |
spellingShingle |
Antarctica firn core glaciology stable isotopes Science Q MANOELA B.P. PORTELLA JEFFERSON C. SIMÕES RONALDO T. BERNARDO JOÃO G. ILHA GINO CASASSA Stable-isotope ratios (δ18O and δD) in a firn core from West Antarctica |
topic_facet |
Antarctica firn core glaciology stable isotopes Science Q |
description |
Abstract A 22.48 m long ice core (BR-IC-4) was collected in the West Antarctic Ice Sheet (at 83°58’59.4” S, 80°07’01.4” W, 1,295 m above the sea level) during the Austral summer of 2004–2005, as a contribution to the International Trans-Antarctic Expedition program. The isotopic composition (δD and δ18O) of 599 samples, corresponding to the upper 12.98 m of the ice core, was determined by gas source mass spectrometry and cavity ring-down spectroscopy. Relative dating was based on the isotopic ratios and major ions (MS-, Na+, nssSO4 2-) and trace elements (Na, S, Sr) concentrations. The record covers approximately 13 years – from 1990 to 2003. The mean accumulation rate of 0.48 ± 0.09 m water equivalent per year (m eq H2O a1) is relatively high for the geographical area and possibly results from snowdrifting from near areas, as attested by ice glaze surfaces in other sites in the region. The stable isotope δD content varies between -367.90‰ and 256.30‰ (mean -314.42 ± 19.01‰); and δ18O ranges from -44.96‰ to 35.08‰ (mean -39.95 ± 2.05‰). Deuterium excess values (mean 3.70 ± 1.54‰) indicate episodic intense oceanic evaporation and high relative humidity in the moisture sources. |
format |
Article in Journal/Newspaper |
author |
MANOELA B.P. PORTELLA JEFFERSON C. SIMÕES RONALDO T. BERNARDO JOÃO G. ILHA GINO CASASSA |
author_facet |
MANOELA B.P. PORTELLA JEFFERSON C. SIMÕES RONALDO T. BERNARDO JOÃO G. ILHA GINO CASASSA |
author_sort |
MANOELA B.P. PORTELLA |
title |
Stable-isotope ratios (δ18O and δD) in a firn core from West Antarctica |
title_short |
Stable-isotope ratios (δ18O and δD) in a firn core from West Antarctica |
title_full |
Stable-isotope ratios (δ18O and δD) in a firn core from West Antarctica |
title_fullStr |
Stable-isotope ratios (δ18O and δD) in a firn core from West Antarctica |
title_full_unstemmed |
Stable-isotope ratios (δ18O and δD) in a firn core from West Antarctica |
title_sort |
stable-isotope ratios (δ18o and δd) in a firn core from west antarctica |
publisher |
Academia Brasileira de Ciências |
publishDate |
2023 |
url |
https://doi.org/10.1590/0001-3765202320230132 https://doaj.org/article/e5871c23d6b243199f7c84838e8df983 |
geographic |
Antarctic Austral West Antarctic Ice Sheet West Antarctica |
geographic_facet |
Antarctic Austral West Antarctic Ice Sheet West Antarctica |
genre |
Antarc* Antarctic Antarctica ice core Ice Sheet West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica ice core Ice Sheet West Antarctica |
op_source |
Anais da Academia Brasileira de Ciências, Vol 95, Iss suppl 3 (2023) |
op_relation |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652023000601115&lng=en&tlng=en http://www.scielo.br/pdf/aabc/v95s3/0001-3765-aabc-95-s3-e20230132.pdf https://doaj.org/toc/1678-2690 1678-2690 doi:10.1590/0001-3765202320230132 https://doaj.org/article/e5871c23d6b243199f7c84838e8df983 |
op_doi |
https://doi.org/10.1590/0001-3765202320230132 |
container_title |
Anais da Academia Brasileira de Ciências |
container_volume |
95 |
container_issue |
suppl 3 |
_version_ |
1788691788388630528 |