Dating of the GV7 East Antarctic ice core by high-resolution chemical records and focus on the accumulation rate variability in the last millennium
Ice core dating is the first step for a correct interpretation of climatic and environmental changes. In this work, we release the dating of the uppermost 197 m of the 250 m deep GV7(B) ice core (drill site, 70∘41′ S, 158∘52′ E; 1950 m a.s.l. in Oates Land, East Antarctica) with a sub-annual resolut...
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Online Access: | https://doi.org/10.5194/cp-17-2073-2021 https://cp.copernicus.org/articles/17/2073/2021/ |
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fttriple:oai:gotriple.eu:0GQDmzgXw5VN9gHk3NJvK 2023-05-15T13:50:25+02:00 Dating of the GV7 East Antarctic ice core by high-resolution chemical records and focus on the accumulation rate variability in the last millennium Nardin, Raffaello Severi, Mirko Amore, Alessandra Becagli, Silvia Burgay, Francois Caiazzo, Laura Ciardini, Virginia Dreossi, Giuliano Frezzotti, Massimo Hong, Sang-Bum Khan, Ishaq Narcisi, Bianca Maria Proposito, Marco Scarchilli, Claudio Selmo, Enricomaria Spolaor, Andrea Stenni, Barbara Traversi, Rita 2021-10-13 https://doi.org/10.5194/cp-17-2073-2021 https://cp.copernicus.org/articles/17/2073/2021/ en eng Copernicus Publications doi:10.5194/cp-17-2073-2021 10670/1.l50gvf 1814-9324 1814-9332 https://cp.copernicus.org/articles/17/2073/2021/ undefined Geographica Helvetica - geography eISSN: 1814-9332 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2021 fttriple https://doi.org/10.5194/cp-17-2073-2021 2023-01-22T17:39:37Z Ice core dating is the first step for a correct interpretation of climatic and environmental changes. In this work, we release the dating of the uppermost 197 m of the 250 m deep GV7(B) ice core (drill site, 70∘41′ S, 158∘52′ E; 1950 m a.s.l. in Oates Land, East Antarctica) with a sub-annual resolution. Chemical records of NO 3-, MSA (methanesulfonic acid), non-sea-salt SO 42- (nss SO42-), sea-salt ions and water stable isotopes (δ18O) were studied as candidates for dating due to their seasonal pattern. Different procedures were tested but the nss SO42- record proved to be the most reliable on the short- and long-term scales, so it was chosen for annual layer counting along the whole ice core. The dating was constrained by using volcanic signatures from historically known events as tie points, thus providing an accurate age–depth relationship for the period 1179–2009 CE. The achievement of the complete age scale allowed us to calculate the annual mean accumulation rate throughout the analyzed 197 m of the core, yielding an annually resolved history of the snow accumulation on site in the last millennium. A small yet consistent rise in accumulation rate (Tr = 1.6, p<0.001) was found for the last 830 years starting around mid-18th century. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica ice core Oates Land Unknown Antarctic East Antarctica Oates Land ENVELOPE(158.000,158.000,-70.000,-70.000) Climate of the Past 17 5 2073 2089 |
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language |
English |
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geo envir |
spellingShingle |
geo envir Nardin, Raffaello Severi, Mirko Amore, Alessandra Becagli, Silvia Burgay, Francois Caiazzo, Laura Ciardini, Virginia Dreossi, Giuliano Frezzotti, Massimo Hong, Sang-Bum Khan, Ishaq Narcisi, Bianca Maria Proposito, Marco Scarchilli, Claudio Selmo, Enricomaria Spolaor, Andrea Stenni, Barbara Traversi, Rita Dating of the GV7 East Antarctic ice core by high-resolution chemical records and focus on the accumulation rate variability in the last millennium |
topic_facet |
geo envir |
description |
Ice core dating is the first step for a correct interpretation of climatic and environmental changes. In this work, we release the dating of the uppermost 197 m of the 250 m deep GV7(B) ice core (drill site, 70∘41′ S, 158∘52′ E; 1950 m a.s.l. in Oates Land, East Antarctica) with a sub-annual resolution. Chemical records of NO 3-, MSA (methanesulfonic acid), non-sea-salt SO 42- (nss SO42-), sea-salt ions and water stable isotopes (δ18O) were studied as candidates for dating due to their seasonal pattern. Different procedures were tested but the nss SO42- record proved to be the most reliable on the short- and long-term scales, so it was chosen for annual layer counting along the whole ice core. The dating was constrained by using volcanic signatures from historically known events as tie points, thus providing an accurate age–depth relationship for the period 1179–2009 CE. The achievement of the complete age scale allowed us to calculate the annual mean accumulation rate throughout the analyzed 197 m of the core, yielding an annually resolved history of the snow accumulation on site in the last millennium. A small yet consistent rise in accumulation rate (Tr = 1.6, p<0.001) was found for the last 830 years starting around mid-18th century. |
format |
Article in Journal/Newspaper |
author |
Nardin, Raffaello Severi, Mirko Amore, Alessandra Becagli, Silvia Burgay, Francois Caiazzo, Laura Ciardini, Virginia Dreossi, Giuliano Frezzotti, Massimo Hong, Sang-Bum Khan, Ishaq Narcisi, Bianca Maria Proposito, Marco Scarchilli, Claudio Selmo, Enricomaria Spolaor, Andrea Stenni, Barbara Traversi, Rita |
author_facet |
Nardin, Raffaello Severi, Mirko Amore, Alessandra Becagli, Silvia Burgay, Francois Caiazzo, Laura Ciardini, Virginia Dreossi, Giuliano Frezzotti, Massimo Hong, Sang-Bum Khan, Ishaq Narcisi, Bianca Maria Proposito, Marco Scarchilli, Claudio Selmo, Enricomaria Spolaor, Andrea Stenni, Barbara Traversi, Rita |
author_sort |
Nardin, Raffaello |
title |
Dating of the GV7 East Antarctic ice core by high-resolution chemical records and focus on the accumulation rate variability in the last millennium |
title_short |
Dating of the GV7 East Antarctic ice core by high-resolution chemical records and focus on the accumulation rate variability in the last millennium |
title_full |
Dating of the GV7 East Antarctic ice core by high-resolution chemical records and focus on the accumulation rate variability in the last millennium |
title_fullStr |
Dating of the GV7 East Antarctic ice core by high-resolution chemical records and focus on the accumulation rate variability in the last millennium |
title_full_unstemmed |
Dating of the GV7 East Antarctic ice core by high-resolution chemical records and focus on the accumulation rate variability in the last millennium |
title_sort |
dating of the gv7 east antarctic ice core by high-resolution chemical records and focus on the accumulation rate variability in the last millennium |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/cp-17-2073-2021 https://cp.copernicus.org/articles/17/2073/2021/ |
long_lat |
ENVELOPE(158.000,158.000,-70.000,-70.000) |
geographic |
Antarctic East Antarctica Oates Land |
geographic_facet |
Antarctic East Antarctica Oates Land |
genre |
Antarc* Antarctic Antarctica East Antarctica ice core Oates Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica ice core Oates Land |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-17-2073-2021 10670/1.l50gvf 1814-9324 1814-9332 https://cp.copernicus.org/articles/17/2073/2021/ |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-17-2073-2021 |
container_title |
Climate of the Past |
container_volume |
17 |
container_issue |
5 |
container_start_page |
2073 |
op_container_end_page |
2089 |
_version_ |
1766253482757586944 |