The new Kr-86 excess ice core proxy for synoptic activity: West Antarctic storminess possibly linked to Intertropical Convergence Zone (ITCZ) movement through the last deglaciation
Abstract. Here we present a newly developed ice core gas-phase proxy that directly samples a component of the large-scale atmospheric circulation: synoptic-scale pressure variability. Surface pressure changes weakly disrupt gravitational isotopic settling in the firn layer, which is recorded in kryp...
Published in: | Climate of the Past |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , |
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2023
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Subjects: | |
Online Access: | https://hal.science/hal-04042989 https://hal.science/hal-04042989/document https://hal.science/hal-04042989/file/cp-19-579-2023.pdf https://doi.org/10.5194/cp-19-579-2023 |
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Archives ouvertes de Paris-Saclay |
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ftuniparissaclay |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Buizert, Christo Shackleton, Sarah Severinghaus, Jeffrey Roberts, William Seltzer, Alan Bereiter, Bernhard Kawamura, Kenji Baggenstos, Daniel Orsi, Anaïs Oyabu, Ikumi Birner, Benjamin Morgan, Jacob Brook, Edward Etheridge, David Thornton, David Bertler, Nancy Pyne, Rebecca Mulvaney, Robert Mosley-Thompson, Ellen Neff, Peter Petrenko, Vasilii The new Kr-86 excess ice core proxy for synoptic activity: West Antarctic storminess possibly linked to Intertropical Convergence Zone (ITCZ) movement through the last deglaciation |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
Abstract. Here we present a newly developed ice core gas-phase proxy that directly samples a component of the large-scale atmospheric circulation: synoptic-scale pressure variability. Surface pressure changes weakly disrupt gravitational isotopic settling in the firn layer, which is recorded in krypton-86 excess (86Krxs). The 86Krxs may therefore reflect the time-averaged synoptic pressure variability over several years (site “storminess”), but it likely cannot record individual synoptic events as ice core gas samples typically average over several years. We validate 86Krxs using late Holocene ice samples from 11 Antarctic ice cores and 1 Greenland ice core that collectively represent a wide range of surface pressure variability in the modern climate. We find a strong spatial correlation (r=-0.94, p<0.01) between site average 86Krxs and time-averaged synoptic variability from reanalysis data. The main uncertainties in the analysis are the corrections for gas loss and thermal fractionation and the relatively large scatter in the data. Limited scientific understanding of the firn physics and potential biases of 86Krxs require caution in interpreting this proxy at present. We show that Antarctic 86Krxs appears to be linked to the position of the Southern Hemisphere eddy-driven subpolar jet (SPJ), with a southern position enhancing pressure variability. We present a 86Krxs record covering the last 24 kyr from the West Antarctic Ice Sheet (WAIS) Divide ice core. Based on the empirical spatial correlation of synoptic activity and 86Krxs at various Antarctic sites, we interpret this record to show that West Antarctic synoptic activity is slightly below modern levels during the Last Glacial Maximum (LGM), increases during the Heinrich Stadial 1 and Younger Dryas North Atlantic cold periods, weakens abruptly at the Holocene onset, remains low during the early and mid-Holocene, and gradually increases to its modern value. The WAIS Divide 86Krxs record resembles records of monsoon intensity thought to reflect changes in ... |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Glaces et Continents, Climats et Isotopes Stables (GLACCIOS) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Buizert, Christo Shackleton, Sarah Severinghaus, Jeffrey Roberts, William Seltzer, Alan Bereiter, Bernhard Kawamura, Kenji Baggenstos, Daniel Orsi, Anaïs Oyabu, Ikumi Birner, Benjamin Morgan, Jacob Brook, Edward Etheridge, David Thornton, David Bertler, Nancy Pyne, Rebecca Mulvaney, Robert Mosley-Thompson, Ellen Neff, Peter Petrenko, Vasilii |
author_facet |
Buizert, Christo Shackleton, Sarah Severinghaus, Jeffrey Roberts, William Seltzer, Alan Bereiter, Bernhard Kawamura, Kenji Baggenstos, Daniel Orsi, Anaïs Oyabu, Ikumi Birner, Benjamin Morgan, Jacob Brook, Edward Etheridge, David Thornton, David Bertler, Nancy Pyne, Rebecca Mulvaney, Robert Mosley-Thompson, Ellen Neff, Peter Petrenko, Vasilii |
author_sort |
Buizert, Christo |
title |
The new Kr-86 excess ice core proxy for synoptic activity: West Antarctic storminess possibly linked to Intertropical Convergence Zone (ITCZ) movement through the last deglaciation |
title_short |
The new Kr-86 excess ice core proxy for synoptic activity: West Antarctic storminess possibly linked to Intertropical Convergence Zone (ITCZ) movement through the last deglaciation |
title_full |
The new Kr-86 excess ice core proxy for synoptic activity: West Antarctic storminess possibly linked to Intertropical Convergence Zone (ITCZ) movement through the last deglaciation |
title_fullStr |
The new Kr-86 excess ice core proxy for synoptic activity: West Antarctic storminess possibly linked to Intertropical Convergence Zone (ITCZ) movement through the last deglaciation |
title_full_unstemmed |
The new Kr-86 excess ice core proxy for synoptic activity: West Antarctic storminess possibly linked to Intertropical Convergence Zone (ITCZ) movement through the last deglaciation |
title_sort |
new kr-86 excess ice core proxy for synoptic activity: west antarctic storminess possibly linked to intertropical convergence zone (itcz) movement through the last deglaciation |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04042989 https://hal.science/hal-04042989/document https://hal.science/hal-04042989/file/cp-19-579-2023.pdf https://doi.org/10.5194/cp-19-579-2023 |
geographic |
Antarctic Greenland West Antarctic Ice Sheet |
geographic_facet |
Antarctic Greenland West Antarctic Ice Sheet |
genre |
Antarc* Antarctic Greenland Greenland ice core ice core Ice Sheet North Atlantic |
genre_facet |
Antarc* Antarctic Greenland Greenland ice core ice core Ice Sheet North Atlantic |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-04042989 Climate of the Past, 2023, 19 (3), pp.579-606. ⟨10.5194/cp-19-579-2023⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-19-579-2023 hal-04042989 https://hal.science/hal-04042989 https://hal.science/hal-04042989/document https://hal.science/hal-04042989/file/cp-19-579-2023.pdf doi:10.5194/cp-19-579-2023 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/cp-19-579-2023 |
container_title |
Climate of the Past |
container_volume |
19 |
container_issue |
3 |
container_start_page |
579 |
op_container_end_page |
606 |
_version_ |
1766286252539117568 |
spelling |
ftuniparissaclay:oai:HAL:hal-04042989v1 2023-05-15T14:13:45+02:00 The new Kr-86 excess ice core proxy for synoptic activity: West Antarctic storminess possibly linked to Intertropical Convergence Zone (ITCZ) movement through the last deglaciation Buizert, Christo Shackleton, Sarah Severinghaus, Jeffrey Roberts, William Seltzer, Alan Bereiter, Bernhard Kawamura, Kenji Baggenstos, Daniel Orsi, Anaïs Oyabu, Ikumi Birner, Benjamin Morgan, Jacob Brook, Edward Etheridge, David Thornton, David Bertler, Nancy Pyne, Rebecca Mulvaney, Robert Mosley-Thompson, Ellen Neff, Peter Petrenko, Vasilii Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Glaces et Continents, Climats et Isotopes Stables (GLACCIOS) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) 2023 https://hal.science/hal-04042989 https://hal.science/hal-04042989/document https://hal.science/hal-04042989/file/cp-19-579-2023.pdf https://doi.org/10.5194/cp-19-579-2023 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-19-579-2023 hal-04042989 https://hal.science/hal-04042989 https://hal.science/hal-04042989/document https://hal.science/hal-04042989/file/cp-19-579-2023.pdf doi:10.5194/cp-19-579-2023 info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-04042989 Climate of the Past, 2023, 19 (3), pp.579-606. ⟨10.5194/cp-19-579-2023⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2023 ftuniparissaclay https://doi.org/10.5194/cp-19-579-2023 2023-04-03T07:47:08Z Abstract. Here we present a newly developed ice core gas-phase proxy that directly samples a component of the large-scale atmospheric circulation: synoptic-scale pressure variability. Surface pressure changes weakly disrupt gravitational isotopic settling in the firn layer, which is recorded in krypton-86 excess (86Krxs). The 86Krxs may therefore reflect the time-averaged synoptic pressure variability over several years (site “storminess”), but it likely cannot record individual synoptic events as ice core gas samples typically average over several years. We validate 86Krxs using late Holocene ice samples from 11 Antarctic ice cores and 1 Greenland ice core that collectively represent a wide range of surface pressure variability in the modern climate. We find a strong spatial correlation (r=-0.94, p<0.01) between site average 86Krxs and time-averaged synoptic variability from reanalysis data. The main uncertainties in the analysis are the corrections for gas loss and thermal fractionation and the relatively large scatter in the data. Limited scientific understanding of the firn physics and potential biases of 86Krxs require caution in interpreting this proxy at present. We show that Antarctic 86Krxs appears to be linked to the position of the Southern Hemisphere eddy-driven subpolar jet (SPJ), with a southern position enhancing pressure variability. We present a 86Krxs record covering the last 24 kyr from the West Antarctic Ice Sheet (WAIS) Divide ice core. Based on the empirical spatial correlation of synoptic activity and 86Krxs at various Antarctic sites, we interpret this record to show that West Antarctic synoptic activity is slightly below modern levels during the Last Glacial Maximum (LGM), increases during the Heinrich Stadial 1 and Younger Dryas North Atlantic cold periods, weakens abruptly at the Holocene onset, remains low during the early and mid-Holocene, and gradually increases to its modern value. The WAIS Divide 86Krxs record resembles records of monsoon intensity thought to reflect changes in ... Article in Journal/Newspaper Antarc* Antarctic Greenland Greenland ice core ice core Ice Sheet North Atlantic Archives ouvertes de Paris-Saclay Antarctic Greenland West Antarctic Ice Sheet Climate of the Past 19 3 579 606 |