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
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 exc...
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Copernicus Publications
2023
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Online Access: | https://doi.org/10.5194/cp-19-579-2023 https://doaj.org/article/51b9134e3ba344ee9899a487aecf1ada |
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ftdoajarticles:oai:doaj.org/article:51b9134e3ba344ee9899a487aecf1ada 2023-05-15T14:13:32+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 C. Buizert S. Shackleton J. P. Severinghaus W. H. G. Roberts A. Seltzer B. Bereiter K. Kawamura D. Baggenstos A. J. Orsi I. Oyabu B. Birner J. D. Morgan E. J. Brook D. M. Etheridge D. Thornton N. Bertler R. L. Pyne R. Mulvaney E. Mosley-Thompson P. D. Neff V. V. Petrenko 2023-03-01T00:00:00Z https://doi.org/10.5194/cp-19-579-2023 https://doaj.org/article/51b9134e3ba344ee9899a487aecf1ada EN eng Copernicus Publications https://cp.copernicus.org/articles/19/579/2023/cp-19-579-2023.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-19-579-2023 1814-9324 1814-9332 https://doaj.org/article/51b9134e3ba344ee9899a487aecf1ada Climate of the Past, Vol 19, Pp 579-606 (2023) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2023 ftdoajarticles https://doi.org/10.5194/cp-19-579-2023 2023-03-19T01:31:12Z 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 ( 86 Kr xs ). The 86 Kr xs 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 86 Kr xs 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 ( <math xmlns="http://www.w3.org/1998/Math/MathML" id="M4" display="inline" overflow="scroll" dspmath="mathml"><mrow><mi>r</mi><mo>=</mo><mo>-</mo><mn mathvariant="normal">0.94</mn></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="49pt" height="10pt" class="svg-formula" dspmath="mathimg" md5hash="a8c2ad7441ec31e0fe39305f24ca4288"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cp-19-579-2023-ie00001.svg" width="49pt" height="10pt" src="cp-19-579-2023-ie00001.png"/></svg:svg> , p <0.01 ) between site average 86 Kr xs 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 86 Kr xs require caution in interpreting this proxy at present. We show that Antarctic 86 Kr xs 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 86 Kr xs record covering the last 24 kyr from the ... Article in Journal/Newspaper Antarc* Antarctic Greenland Greenland ice core ice core Directory of Open Access Journals: DOAJ Articles Antarctic Greenland Climate of the Past 19 3 579 606 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 C. Buizert S. Shackleton J. P. Severinghaus W. H. G. Roberts A. Seltzer B. Bereiter K. Kawamura D. Baggenstos A. J. Orsi I. Oyabu B. Birner J. D. Morgan E. J. Brook D. M. Etheridge D. Thornton N. Bertler R. L. Pyne R. Mulvaney E. Mosley-Thompson P. D. Neff V. V. Petrenko 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 |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
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 ( 86 Kr xs ). The 86 Kr xs 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 86 Kr xs 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 ( <math xmlns="http://www.w3.org/1998/Math/MathML" id="M4" display="inline" overflow="scroll" dspmath="mathml"><mrow><mi>r</mi><mo>=</mo><mo>-</mo><mn mathvariant="normal">0.94</mn></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="49pt" height="10pt" class="svg-formula" dspmath="mathimg" md5hash="a8c2ad7441ec31e0fe39305f24ca4288"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cp-19-579-2023-ie00001.svg" width="49pt" height="10pt" src="cp-19-579-2023-ie00001.png"/></svg:svg> , p <0.01 ) between site average 86 Kr xs 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 86 Kr xs require caution in interpreting this proxy at present. We show that Antarctic 86 Kr xs 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 86 Kr xs record covering the last 24 kyr from the ... |
format |
Article in Journal/Newspaper |
author |
C. Buizert S. Shackleton J. P. Severinghaus W. H. G. Roberts A. Seltzer B. Bereiter K. Kawamura D. Baggenstos A. J. Orsi I. Oyabu B. Birner J. D. Morgan E. J. Brook D. M. Etheridge D. Thornton N. Bertler R. L. Pyne R. Mulvaney E. Mosley-Thompson P. D. Neff V. V. Petrenko |
author_facet |
C. Buizert S. Shackleton J. P. Severinghaus W. H. G. Roberts A. Seltzer B. Bereiter K. Kawamura D. Baggenstos A. J. Orsi I. Oyabu B. Birner J. D. Morgan E. J. Brook D. M. Etheridge D. Thornton N. Bertler R. L. Pyne R. Mulvaney E. Mosley-Thompson P. D. Neff V. V. Petrenko |
author_sort |
C. Buizert |
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 |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/cp-19-579-2023 https://doaj.org/article/51b9134e3ba344ee9899a487aecf1ada |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic Greenland Greenland ice core ice core |
genre_facet |
Antarc* Antarctic Greenland Greenland ice core ice core |
op_source |
Climate of the Past, Vol 19, Pp 579-606 (2023) |
op_relation |
https://cp.copernicus.org/articles/19/579/2023/cp-19-579-2023.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-19-579-2023 1814-9324 1814-9332 https://doaj.org/article/51b9134e3ba344ee9899a487aecf1ada |
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 |
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