The SP19 chronology for the South Pole Ice Core – Part 2: gas chronology, Δage, and smoothing of atmospheric records
Abstract. 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 t...
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Online Access: | https://escholarship.org/uc/item/29q967cx https://escholarship.org/content/qt29q967cx/qt29q967cx.pdf https://doi.org/10.5194/cp-16-2431-2020 |
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ftcdlib:oai:escholarship.org:ark:/13030/qt29q967cx 2024-09-15T17:41:21+00:00 The SP19 chronology for the South Pole Ice Core – Part 2: gas chronology, Δage, and smoothing of atmospheric records Epifanio, Jenna A Brook, Edward J Buizert, Christo Edwards, Jon S Sowers, Todd A Kahle, Emma C Severinghaus, Jeffrey P Steig, Eric J Winski, Dominic A Osterberg, Erich C Fudge, Tyler J Aydin, Murat Hood, Ekaterina Kalk, Michael Kreutz, Karl J Ferris, David G Kennedy, Joshua A 2431 - 2444 2020-01-01 application/pdf https://escholarship.org/uc/item/29q967cx https://escholarship.org/content/qt29q967cx/qt29q967cx.pdf https://doi.org/10.5194/cp-16-2431-2020 unknown eScholarship, University of California qt29q967cx https://escholarship.org/uc/item/29q967cx https://escholarship.org/content/qt29q967cx/qt29q967cx.pdf doi:10.5194/cp-16-2431-2020 public Climate of the Past, vol 16, iss 6 Climate Action Physical Geography and Environmental Geoscience Paleontology article 2020 ftcdlib https://doi.org/10.5194/cp-16-2431-2020 2024-06-28T06:28:20Z Abstract. 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 (CH4) record with 20- to 190-year resolution. To construct the gas timescale, abrupt changes in atmospheric CH4 during the glacial period and centennial CH4 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 CH4 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 Δage. 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 University of California: eScholarship Climate of the Past 16 6 2431 2444 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Climate Action Physical Geography and Environmental Geoscience Paleontology |
spellingShingle |
Climate Action Physical Geography and Environmental Geoscience Paleontology Epifanio, Jenna A Brook, Edward J Buizert, Christo Edwards, Jon S Sowers, Todd A Kahle, Emma C Severinghaus, Jeffrey P Steig, Eric J Winski, Dominic A Osterberg, Erich C Fudge, Tyler J Aydin, Murat Hood, Ekaterina Kalk, Michael Kreutz, Karl J Ferris, David G Kennedy, Joshua A The SP19 chronology for the South Pole Ice Core – Part 2: gas chronology, Δage, and smoothing of atmospheric records |
topic_facet |
Climate Action Physical Geography and Environmental Geoscience Paleontology |
description |
Abstract. 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 (CH4) record with 20- to 190-year resolution. To construct the gas timescale, abrupt changes in atmospheric CH4 during the glacial period and centennial CH4 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 CH4 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 Δage. 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 |
Epifanio, Jenna A Brook, Edward J Buizert, Christo Edwards, Jon S Sowers, Todd A Kahle, Emma C Severinghaus, Jeffrey P Steig, Eric J Winski, Dominic A Osterberg, Erich C Fudge, Tyler J Aydin, Murat Hood, Ekaterina Kalk, Michael Kreutz, Karl J Ferris, David G Kennedy, Joshua A |
author_facet |
Epifanio, Jenna A Brook, Edward J Buizert, Christo Edwards, Jon S Sowers, Todd A Kahle, Emma C Severinghaus, Jeffrey P Steig, Eric J Winski, Dominic A Osterberg, Erich C Fudge, Tyler J Aydin, Murat Hood, Ekaterina Kalk, Michael Kreutz, Karl J Ferris, David G Kennedy, Joshua A |
author_sort |
Epifanio, Jenna A |
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 |
eScholarship, University of California |
publishDate |
2020 |
url |
https://escholarship.org/uc/item/29q967cx https://escholarship.org/content/qt29q967cx/qt29q967cx.pdf https://doi.org/10.5194/cp-16-2431-2020 |
op_coverage |
2431 - 2444 |
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, iss 6 |
op_relation |
qt29q967cx https://escholarship.org/uc/item/29q967cx https://escholarship.org/content/qt29q967cx/qt29q967cx.pdf doi:10.5194/cp-16-2431-2020 |
op_rights |
public |
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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1810487505055645696 |