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 r...
Published in: | Climate of the Past |
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Main Authors: | , , , , , , , , , , , , , , , , , |
Format: | Text |
Language: | English |
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2021
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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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Copernicus Publications: E-Journals |
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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 <math xmlns="http://www.w3.org/1998/Math/MathML" id="M5" display="inline" overflow="scroll" dspmath="mathml"><mrow><msubsup><mi/><mn mathvariant="normal">3</mn><mo>-</mo></msubsup></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="9pt" height="16pt" class="svg-formula" dspmath="mathimg" md5hash="8c72af1edd6d67ed562efcaf5163d22b"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cp-17-2073-2021-ie00001.svg" width="9pt" height="16pt" src="cp-17-2073-2021-ie00001.png"/></svg:svg> , MSA (methanesulfonic acid), non-sea-salt SO <math xmlns="http://www.w3.org/1998/Math/MathML" id="M6" display="inline" overflow="scroll" dspmath="mathml"><mrow><msubsup><mi/><mn mathvariant="normal">4</mn><mrow><mn mathvariant="normal">2</mn><mo>-</mo></mrow></msubsup></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="13pt" height="17pt" class="svg-formula" dspmath="mathimg" md5hash="4a53e7d1f00f4334c934356877052515"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cp-17-2073-2021-ie00002.svg" width="13pt" height="17pt" src="cp-17-2073-2021-ie00002.png"/></svg:svg> (nss <math xmlns="http://www.w3.org/1998/Math/MathML" id="M7" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msubsup><mi mathvariant="normal">SO</mi><mn mathvariant="normal">4</mn><mrow><mn mathvariant="normal">2</mn><mo>-</mo></mrow></msubsup></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="29pt" height="17pt" class="svg-formula" dspmath="mathimg" md5hash="70c2dca1cdebf0791ac6d03f5c421763"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cp-17-2073-2021-ie00003.svg" width="29pt" height="17pt" src="cp-17-2073-2021-ie00003.png"/></svg:svg> ), sea-salt ions and water stable isotopes ( δ 18 O) were studied as candidates for dating due to their seasonal pattern. Different procedures were tested but the nss <math xmlns="http://www.w3.org/1998/Math/MathML" id="M9" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msubsup><mi mathvariant="normal">SO</mi><mn mathvariant="normal">4</mn><mrow><mn mathvariant="normal">2</mn><mo>-</mo></mrow></msubsup></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="29pt" height="17pt" class="svg-formula" dspmath="mathimg" md5hash="06a1e144313624090049b6627390d3e8"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cp-17-2073-2021-ie00004.svg" width="29pt" height="17pt" src="cp-17-2073-2021-ie00004.png"/></svg:svg> 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 |
Text |
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 |
spellingShingle |
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 |
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 |
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 |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-17-2073-2021 https://cp.copernicus.org/articles/17/2073/2021/ |
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_ |
1766272467227115520 |
spelling |
ftcopernicus:oai:publications.copernicus.org:cp94218 2023-05-15T14:02:17+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 application/pdf https://doi.org/10.5194/cp-17-2073-2021 https://cp.copernicus.org/articles/17/2073/2021/ eng eng doi:10.5194/cp-17-2073-2021 https://cp.copernicus.org/articles/17/2073/2021/ eISSN: 1814-9332 Text 2021 ftcopernicus https://doi.org/10.5194/cp-17-2073-2021 2021-10-18T16:22:31Z 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 <math xmlns="http://www.w3.org/1998/Math/MathML" id="M5" display="inline" overflow="scroll" dspmath="mathml"><mrow><msubsup><mi/><mn mathvariant="normal">3</mn><mo>-</mo></msubsup></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="9pt" height="16pt" class="svg-formula" dspmath="mathimg" md5hash="8c72af1edd6d67ed562efcaf5163d22b"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cp-17-2073-2021-ie00001.svg" width="9pt" height="16pt" src="cp-17-2073-2021-ie00001.png"/></svg:svg> , MSA (methanesulfonic acid), non-sea-salt SO <math xmlns="http://www.w3.org/1998/Math/MathML" id="M6" display="inline" overflow="scroll" dspmath="mathml"><mrow><msubsup><mi/><mn mathvariant="normal">4</mn><mrow><mn mathvariant="normal">2</mn><mo>-</mo></mrow></msubsup></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="13pt" height="17pt" class="svg-formula" dspmath="mathimg" md5hash="4a53e7d1f00f4334c934356877052515"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cp-17-2073-2021-ie00002.svg" width="13pt" height="17pt" src="cp-17-2073-2021-ie00002.png"/></svg:svg> (nss <math xmlns="http://www.w3.org/1998/Math/MathML" id="M7" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msubsup><mi mathvariant="normal">SO</mi><mn mathvariant="normal">4</mn><mrow><mn mathvariant="normal">2</mn><mo>-</mo></mrow></msubsup></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="29pt" height="17pt" class="svg-formula" dspmath="mathimg" md5hash="70c2dca1cdebf0791ac6d03f5c421763"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cp-17-2073-2021-ie00003.svg" width="29pt" height="17pt" src="cp-17-2073-2021-ie00003.png"/></svg:svg> ), sea-salt ions and water stable isotopes ( δ 18 O) were studied as candidates for dating due to their seasonal pattern. Different procedures were tested but the nss <math xmlns="http://www.w3.org/1998/Math/MathML" id="M9" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msubsup><mi mathvariant="normal">SO</mi><mn mathvariant="normal">4</mn><mrow><mn mathvariant="normal">2</mn><mo>-</mo></mrow></msubsup></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="29pt" height="17pt" class="svg-formula" dspmath="mathimg" md5hash="06a1e144313624090049b6627390d3e8"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cp-17-2073-2021-ie00004.svg" width="29pt" height="17pt" src="cp-17-2073-2021-ie00004.png"/></svg:svg> 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. Text Antarc* Antarctic Antarctica East Antarctica ice core Oates Land Copernicus Publications: E-Journals Antarctic East Antarctica Oates Land ENVELOPE(158.000,158.000,-70.000,-70.000) Climate of the Past 17 5 2073 2089 |