A comparison of South Pacific Antarctic sea ice and atmospheric circulation reconstructions since 1900
The recent changes and record lows in Antarctic sea ice extent illustrate the need for longer estimates beyond the short satellite observation period commencing around 1979. However, Antarctic sea ice extent reconstructions since 1900 based on paleo-records and those generated based on instrumental...
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ftdoajarticles:oai:doaj.org/article:66ce0c3900aa4a11b8cab6760a25cace 2024-02-04T09:54:55+01:00 A comparison of South Pacific Antarctic sea ice and atmospheric circulation reconstructions since 1900 R. L. Fogt Q. Dalaiden G. K. O'Connor 2024-01-01T00:00:00Z https://doi.org/10.5194/cp-20-53-2024 https://doaj.org/article/66ce0c3900aa4a11b8cab6760a25cace EN eng Copernicus Publications https://cp.copernicus.org/articles/20/53/2024/cp-20-53-2024.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-20-53-2024 1814-9324 1814-9332 https://doaj.org/article/66ce0c3900aa4a11b8cab6760a25cace Climate of the Past, Vol 20, Pp 53-76 (2024) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2024 ftdoajarticles https://doi.org/10.5194/cp-20-53-2024 2024-01-07T01:35:35Z The recent changes and record lows in Antarctic sea ice extent illustrate the need for longer estimates beyond the short satellite observation period commencing around 1979. However, Antarctic sea ice extent reconstructions since 1900 based on paleo-records and those generated based on instrumental observations from the Southern Hemisphere midlatitudes are markedly different, especially prior to 1979. Here, these reconstructions are examined with the goal of understanding the relative strengths and limitations of each reconstruction better so that researchers using the various datasets can interpret them appropriately. Overall, it is found that the different spatial and temporal resolutions of each dataset play a secondary role to the inherent connections each reconstruction has with its implied atmospheric circulation. Five Southern Hemisphere pressure reconstructions spanning the 20th century are thus examined further. There are different variabilities and trends poleward of 60 ∘ S between proxy-based and station-based 20th century pressure reconstructions, which are connected to the disagreement between the Antarctic sea ice extent reconstructions examined here. Importantly, reconstructions based on only coral records provide the best agreement between the early pressure reconstructions, suggesting that a contributing role of tropical variability is present in the station-based pressure (and therefore sea ice) reconstructions. In contrast, ice-core-only reconstructions provide a local, high-latitude constraint that creates differences between the proxy-based and station-based reconstructions near Antarctica. Our results reveal the greatest consistencies and inconsistencies in available datasets and highlight the need to better understand the relative roles of the tropics versus high latitudes in historical sea ice variability around Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica ice core Sea ice Directory of Open Access Journals: DOAJ Articles Antarctic Pacific The Antarctic Climate of the Past 20 1 53 76 |
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 R. L. Fogt Q. Dalaiden G. K. O'Connor A comparison of South Pacific Antarctic sea ice and atmospheric circulation reconstructions since 1900 |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
The recent changes and record lows in Antarctic sea ice extent illustrate the need for longer estimates beyond the short satellite observation period commencing around 1979. However, Antarctic sea ice extent reconstructions since 1900 based on paleo-records and those generated based on instrumental observations from the Southern Hemisphere midlatitudes are markedly different, especially prior to 1979. Here, these reconstructions are examined with the goal of understanding the relative strengths and limitations of each reconstruction better so that researchers using the various datasets can interpret them appropriately. Overall, it is found that the different spatial and temporal resolutions of each dataset play a secondary role to the inherent connections each reconstruction has with its implied atmospheric circulation. Five Southern Hemisphere pressure reconstructions spanning the 20th century are thus examined further. There are different variabilities and trends poleward of 60 ∘ S between proxy-based and station-based 20th century pressure reconstructions, which are connected to the disagreement between the Antarctic sea ice extent reconstructions examined here. Importantly, reconstructions based on only coral records provide the best agreement between the early pressure reconstructions, suggesting that a contributing role of tropical variability is present in the station-based pressure (and therefore sea ice) reconstructions. In contrast, ice-core-only reconstructions provide a local, high-latitude constraint that creates differences between the proxy-based and station-based reconstructions near Antarctica. Our results reveal the greatest consistencies and inconsistencies in available datasets and highlight the need to better understand the relative roles of the tropics versus high latitudes in historical sea ice variability around Antarctica. |
format |
Article in Journal/Newspaper |
author |
R. L. Fogt Q. Dalaiden G. K. O'Connor |
author_facet |
R. L. Fogt Q. Dalaiden G. K. O'Connor |
author_sort |
R. L. Fogt |
title |
A comparison of South Pacific Antarctic sea ice and atmospheric circulation reconstructions since 1900 |
title_short |
A comparison of South Pacific Antarctic sea ice and atmospheric circulation reconstructions since 1900 |
title_full |
A comparison of South Pacific Antarctic sea ice and atmospheric circulation reconstructions since 1900 |
title_fullStr |
A comparison of South Pacific Antarctic sea ice and atmospheric circulation reconstructions since 1900 |
title_full_unstemmed |
A comparison of South Pacific Antarctic sea ice and atmospheric circulation reconstructions since 1900 |
title_sort |
comparison of south pacific antarctic sea ice and atmospheric circulation reconstructions since 1900 |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/cp-20-53-2024 https://doaj.org/article/66ce0c3900aa4a11b8cab6760a25cace |
geographic |
Antarctic Pacific The Antarctic |
geographic_facet |
Antarctic Pacific The Antarctic |
genre |
Antarc* Antarctic Antarctica ice core Sea ice |
genre_facet |
Antarc* Antarctic Antarctica ice core Sea ice |
op_source |
Climate of the Past, Vol 20, Pp 53-76 (2024) |
op_relation |
https://cp.copernicus.org/articles/20/53/2024/cp-20-53-2024.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-20-53-2024 1814-9324 1814-9332 https://doaj.org/article/66ce0c3900aa4a11b8cab6760a25cace |
op_doi |
https://doi.org/10.5194/cp-20-53-2024 |
container_title |
Climate of the Past |
container_volume |
20 |
container_issue |
1 |
container_start_page |
53 |
op_container_end_page |
76 |
_version_ |
1789958738907496448 |