Very old firn air linked to strong density layering at Styx Glacier, coastal Victoria Land, East Antarctica
Firn air provides plenty of old air from the near past, and can therefore be useful for understanding human impact on the recent history of the atmospheric composition. Most of the existing firn air records cover only the last several decades (typically 40 to 55 years) and are insufficient to unders...
Published in: | The Cryosphere |
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2019
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00040356 2023-05-15T14:02:33+02:00 Very old firn air linked to strong density layering at Styx Glacier, coastal Victoria Land, East Antarctica Jang, Youngjoon Hong, Sang Bum Buizert, Christo Lee, Hun-Gyu Han, Sang-Young Yang, Ji-Woong Iizuka, Yoshinori Hori, Akira Han, Yeongcheol Jun, Seong Joon Tans, Pieter Choi, Taejin Kim, Seong-Joong Hur, Soon Do Ahn, Jinho 2019-09 electronic https://doi.org/10.5194/tc-13-2407-2019 https://noa.gwlb.de/receive/cop_mods_00040356 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00039980/tc-13-2407-2019.pdf https://tc.copernicus.org/articles/13/2407/2019/tc-13-2407-2019.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-13-2407-2019 https://noa.gwlb.de/receive/cop_mods_00040356 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00039980/tc-13-2407-2019.pdf https://tc.copernicus.org/articles/13/2407/2019/tc-13-2407-2019.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2019 ftnonlinearchiv https://doi.org/10.5194/tc-13-2407-2019 2022-02-08T22:42:10Z Firn air provides plenty of old air from the near past, and can therefore be useful for understanding human impact on the recent history of the atmospheric composition. Most of the existing firn air records cover only the last several decades (typically 40 to 55 years) and are insufficient to understand the early part of anthropogenic impacts on the atmosphere. In contrast, a few firn air records from inland sites, where temperatures and snow accumulation rates are very low, go back in time about a century. In this study, we report an unusually old firn air effective CO2 age of 93 years from Styx Glacier, near the Ross Sea coast in Antarctica. This is the first report of such an old firn air age (>55 years) from a warm coastal site. The lock-in zone thickness of 12.4 m is larger than at other sites where snow accumulation rates and air temperature are similar. High-resolution X-ray density measurements demonstrate a high variability of the vertical snow density at Styx Glacier. The CH4 mole fraction and total air content of the closed pores also indicate large variations in centimeter-scale depth intervals, indicative of layering. We hypothesize that the large density variations in the firn increase the thickness of the lock-in zone and, consequently, increase the firn air ages because the age of firn air increases more rapidly with depth in the lock-in zone than in the diffusive zone. Our study demonstrates that all else being equal, sites where weather conditions are favorable for the formation of large density variations at the lock-in zone preserve older air within their open porosity, making them ideal places for firn air sampling. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Ross Sea The Cryosphere Victoria Land Niedersächsisches Online-Archiv NOA East Antarctica Ross Sea Styx Glacier ENVELOPE(163.850,163.850,-74.033,-74.033) Victoria Land The Cryosphere 13 9 2407 2419 |
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Niedersächsisches Online-Archiv NOA |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Jang, Youngjoon Hong, Sang Bum Buizert, Christo Lee, Hun-Gyu Han, Sang-Young Yang, Ji-Woong Iizuka, Yoshinori Hori, Akira Han, Yeongcheol Jun, Seong Joon Tans, Pieter Choi, Taejin Kim, Seong-Joong Hur, Soon Do Ahn, Jinho Very old firn air linked to strong density layering at Styx Glacier, coastal Victoria Land, East Antarctica |
topic_facet |
article Verlagsveröffentlichung |
description |
Firn air provides plenty of old air from the near past, and can therefore be useful for understanding human impact on the recent history of the atmospheric composition. Most of the existing firn air records cover only the last several decades (typically 40 to 55 years) and are insufficient to understand the early part of anthropogenic impacts on the atmosphere. In contrast, a few firn air records from inland sites, where temperatures and snow accumulation rates are very low, go back in time about a century. In this study, we report an unusually old firn air effective CO2 age of 93 years from Styx Glacier, near the Ross Sea coast in Antarctica. This is the first report of such an old firn air age (>55 years) from a warm coastal site. The lock-in zone thickness of 12.4 m is larger than at other sites where snow accumulation rates and air temperature are similar. High-resolution X-ray density measurements demonstrate a high variability of the vertical snow density at Styx Glacier. The CH4 mole fraction and total air content of the closed pores also indicate large variations in centimeter-scale depth intervals, indicative of layering. We hypothesize that the large density variations in the firn increase the thickness of the lock-in zone and, consequently, increase the firn air ages because the age of firn air increases more rapidly with depth in the lock-in zone than in the diffusive zone. Our study demonstrates that all else being equal, sites where weather conditions are favorable for the formation of large density variations at the lock-in zone preserve older air within their open porosity, making them ideal places for firn air sampling. |
format |
Article in Journal/Newspaper |
author |
Jang, Youngjoon Hong, Sang Bum Buizert, Christo Lee, Hun-Gyu Han, Sang-Young Yang, Ji-Woong Iizuka, Yoshinori Hori, Akira Han, Yeongcheol Jun, Seong Joon Tans, Pieter Choi, Taejin Kim, Seong-Joong Hur, Soon Do Ahn, Jinho |
author_facet |
Jang, Youngjoon Hong, Sang Bum Buizert, Christo Lee, Hun-Gyu Han, Sang-Young Yang, Ji-Woong Iizuka, Yoshinori Hori, Akira Han, Yeongcheol Jun, Seong Joon Tans, Pieter Choi, Taejin Kim, Seong-Joong Hur, Soon Do Ahn, Jinho |
author_sort |
Jang, Youngjoon |
title |
Very old firn air linked to strong density layering at Styx Glacier, coastal Victoria Land, East Antarctica |
title_short |
Very old firn air linked to strong density layering at Styx Glacier, coastal Victoria Land, East Antarctica |
title_full |
Very old firn air linked to strong density layering at Styx Glacier, coastal Victoria Land, East Antarctica |
title_fullStr |
Very old firn air linked to strong density layering at Styx Glacier, coastal Victoria Land, East Antarctica |
title_full_unstemmed |
Very old firn air linked to strong density layering at Styx Glacier, coastal Victoria Land, East Antarctica |
title_sort |
very old firn air linked to strong density layering at styx glacier, coastal victoria land, east antarctica |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-13-2407-2019 https://noa.gwlb.de/receive/cop_mods_00040356 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00039980/tc-13-2407-2019.pdf https://tc.copernicus.org/articles/13/2407/2019/tc-13-2407-2019.pdf |
long_lat |
ENVELOPE(163.850,163.850,-74.033,-74.033) |
geographic |
East Antarctica Ross Sea Styx Glacier Victoria Land |
geographic_facet |
East Antarctica Ross Sea Styx Glacier Victoria Land |
genre |
Antarc* Antarctica East Antarctica Ross Sea The Cryosphere Victoria Land |
genre_facet |
Antarc* Antarctica East Antarctica Ross Sea The Cryosphere Victoria Land |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-13-2407-2019 https://noa.gwlb.de/receive/cop_mods_00040356 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00039980/tc-13-2407-2019.pdf https://tc.copernicus.org/articles/13/2407/2019/tc-13-2407-2019.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-13-2407-2019 |
container_title |
The Cryosphere |
container_volume |
13 |
container_issue |
9 |
container_start_page |
2407 |
op_container_end_page |
2419 |
_version_ |
1766272869399003136 |