The SP19 chronology for the South Pole Ice Core – Part 2: gas chronology, Δage, and smoothing of atmospheric records
A new ice core drilled at the South Pole provides a 54 000-year paleoenvironmental record including the composition of the past atmosphere. This paper describes the SP19 chronology for the South Pole atmospheric gas record and complements a previous paper (Winski et al., 2019) describing the SP19 ic...
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ftdoajarticles:oai:doaj.org/article:0c0612043472464eab5a0f65e13fb549 2023-05-15T13:39:48+02:00 The SP19 chronology for the South Pole Ice Core – Part 2: gas chronology, Δage, and smoothing of atmospheric records J. A. Epifanio E. J. Brook C. Buizert J. S. Edwards T. A. Sowers E. C. Kahle J. P. Severinghaus E. J. Steig D. A. Winski E. C. Osterberg T. J. Fudge M. Aydin E. Hood M. Kalk K. J. Kreutz D. G. Ferris J. A. Kennedy 2020-12-01T00:00:00Z https://doi.org/10.5194/cp-16-2431-2020 https://doaj.org/article/0c0612043472464eab5a0f65e13fb549 EN eng Copernicus Publications https://cp.copernicus.org/articles/16/2431/2020/cp-16-2431-2020.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-16-2431-2020 1814-9324 1814-9332 https://doaj.org/article/0c0612043472464eab5a0f65e13fb549 Climate of the Past, Vol 16, Pp 2431-2444 (2020) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2020 ftdoajarticles https://doi.org/10.5194/cp-16-2431-2020 2022-12-31T15:07:30Z A new ice core drilled at the South Pole provides a 54 000-year paleoenvironmental record including the composition of the past atmosphere. This paper describes the SP19 chronology for the South Pole atmospheric gas record and complements a previous paper (Winski et al., 2019) describing the SP19 ice chronology. The gas chronology is based on a discrete methane (CH 4 ) record with 20- to 190-year resolution. To construct the gas timescale, abrupt changes in atmospheric CH 4 during the glacial period and centennial CH 4 variability during the Holocene were used to synchronize the South Pole gas record with analogous data from the West Antarctic Ice Sheet Divide ice core. Stratigraphic matching based on visual optimization was verified using an automated matching algorithm. The South Pole ice core recovers all expected changes in CH 4 based on previous records. Gas transport in the firn results in smoothing of the atmospheric gas record with a smoothing function spectral width that ranges from 30 to 78 years, equal to 3 % of the gas-age–ice-age difference, or Δ age. The new gas chronology, in combination with the existing ice age scale from Winski et al. (2019), allows a model-independent reconstruction of the gas-age–ice-age difference through the whole record, which will be useful for testing firn densification models. Article in Journal/Newspaper Antarc* Antarctic ice core Ice Sheet South pole South pole Directory of Open Access Journals: DOAJ Articles Antarctic South Pole West Antarctic Ice Sheet Climate of the Past 16 6 2431 2444 |
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 J. A. Epifanio E. J. Brook C. Buizert J. S. Edwards T. A. Sowers E. C. Kahle J. P. Severinghaus E. J. Steig D. A. Winski E. C. Osterberg T. J. Fudge M. Aydin E. Hood M. Kalk K. J. Kreutz D. G. Ferris J. A. Kennedy The SP19 chronology for the South Pole Ice Core – Part 2: gas chronology, Δage, and smoothing of atmospheric records |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
A new ice core drilled at the South Pole provides a 54 000-year paleoenvironmental record including the composition of the past atmosphere. This paper describes the SP19 chronology for the South Pole atmospheric gas record and complements a previous paper (Winski et al., 2019) describing the SP19 ice chronology. The gas chronology is based on a discrete methane (CH 4 ) record with 20- to 190-year resolution. To construct the gas timescale, abrupt changes in atmospheric CH 4 during the glacial period and centennial CH 4 variability during the Holocene were used to synchronize the South Pole gas record with analogous data from the West Antarctic Ice Sheet Divide ice core. Stratigraphic matching based on visual optimization was verified using an automated matching algorithm. The South Pole ice core recovers all expected changes in CH 4 based on previous records. Gas transport in the firn results in smoothing of the atmospheric gas record with a smoothing function spectral width that ranges from 30 to 78 years, equal to 3 % of the gas-age–ice-age difference, or Δ age. The new gas chronology, in combination with the existing ice age scale from Winski et al. (2019), allows a model-independent reconstruction of the gas-age–ice-age difference through the whole record, which will be useful for testing firn densification models. |
format |
Article in Journal/Newspaper |
author |
J. A. Epifanio E. J. Brook C. Buizert J. S. Edwards T. A. Sowers E. C. Kahle J. P. Severinghaus E. J. Steig D. A. Winski E. C. Osterberg T. J. Fudge M. Aydin E. Hood M. Kalk K. J. Kreutz D. G. Ferris J. A. Kennedy |
author_facet |
J. A. Epifanio E. J. Brook C. Buizert J. S. Edwards T. A. Sowers E. C. Kahle J. P. Severinghaus E. J. Steig D. A. Winski E. C. Osterberg T. J. Fudge M. Aydin E. Hood M. Kalk K. J. Kreutz D. G. Ferris J. A. Kennedy |
author_sort |
J. A. Epifanio |
title |
The SP19 chronology for the South Pole Ice Core – Part 2: gas chronology, Δage, and smoothing of atmospheric records |
title_short |
The SP19 chronology for the South Pole Ice Core – Part 2: gas chronology, Δage, and smoothing of atmospheric records |
title_full |
The SP19 chronology for the South Pole Ice Core – Part 2: gas chronology, Δage, and smoothing of atmospheric records |
title_fullStr |
The SP19 chronology for the South Pole Ice Core – Part 2: gas chronology, Δage, and smoothing of atmospheric records |
title_full_unstemmed |
The SP19 chronology for the South Pole Ice Core – Part 2: gas chronology, Δage, and smoothing of atmospheric records |
title_sort |
sp19 chronology for the south pole ice core – part 2: gas chronology, δage, and smoothing of atmospheric records |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/cp-16-2431-2020 https://doaj.org/article/0c0612043472464eab5a0f65e13fb549 |
geographic |
Antarctic South Pole West Antarctic Ice Sheet |
geographic_facet |
Antarctic South Pole West Antarctic Ice Sheet |
genre |
Antarc* Antarctic ice core Ice Sheet South pole South pole |
genre_facet |
Antarc* Antarctic ice core Ice Sheet South pole South pole |
op_source |
Climate of the Past, Vol 16, Pp 2431-2444 (2020) |
op_relation |
https://cp.copernicus.org/articles/16/2431/2020/cp-16-2431-2020.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-16-2431-2020 1814-9324 1814-9332 https://doaj.org/article/0c0612043472464eab5a0f65e13fb549 |
op_doi |
https://doi.org/10.5194/cp-16-2431-2020 |
container_title |
Climate of the Past |
container_volume |
16 |
container_issue |
6 |
container_start_page |
2431 |
op_container_end_page |
2444 |
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1766124957789585408 |