High-resolution mineral dust and sea ice proxy records from the Talos Dome ice core
In this study we report on new non-sea salt calcium (nssCa 2+ , mineral dust proxy) and sea salt sodium (ssNa + , sea ice proxy) records along the East Antarctic Talos Dome deep ice core in centennial resolution reaching back 150 thousand years (ka) before present. During glacial conditions nssCa 2+...
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ftdoajarticles:oai:doaj.org/article:0c8e1e6224814728b1f1aa48e5ec3314 2023-05-15T13:39:56+02:00 High-resolution mineral dust and sea ice proxy records from the Talos Dome ice core S. Schüpbach U. Federer P. R. Kaufmann S. Albani C. Barbante T. F. Stocker H. Fischer 2013-12-01T00:00:00Z https://doi.org/10.5194/cp-9-2789-2013 https://doaj.org/article/0c8e1e6224814728b1f1aa48e5ec3314 EN eng Copernicus Publications http://www.clim-past.net/9/2789/2013/cp-9-2789-2013.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-9-2789-2013 https://doaj.org/article/0c8e1e6224814728b1f1aa48e5ec3314 Climate of the Past, Vol 9, Iss 6, Pp 2789-2807 (2013) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2013 ftdoajarticles https://doi.org/10.5194/cp-9-2789-2013 2022-12-31T11:44:55Z In this study we report on new non-sea salt calcium (nssCa 2+ , mineral dust proxy) and sea salt sodium (ssNa + , sea ice proxy) records along the East Antarctic Talos Dome deep ice core in centennial resolution reaching back 150 thousand years (ka) before present. During glacial conditions nssCa 2+ fluxes in Talos Dome are strongly related to temperature as has been observed before in other deep Antarctic ice core records, and has been associated with synchronous changes in the main source region (southern South America) during climate variations in the last glacial. However, during warmer climate conditions Talos Dome mineral dust input is clearly elevated compared to other records mainly due to the contribution of additional local dust sources in the Ross Sea area. Based on a simple transport model, we compare nssCa 2+ fluxes of different East Antarctic ice cores. From this multi-site comparison we conclude that changes in transport efficiency or atmospheric lifetime of dust particles do have a minor effect compared to source strength changes on the large-scale concentration changes observed in Antarctic ice cores during climate variations of the past 150 ka. Our transport model applied on ice core data is further validated by climate model data. The availability of multiple East Antarctic nssCa 2+ records also allows for a revision of a former estimate on the atmospheric CO 2 sensitivity to reduced dust induced iron fertilisation in the Southern Ocean during the transition from the Last Glacial Maximum to the Holocene (T1). While a former estimate based on the EPICA Dome C (EDC) record only suggested 20 ppm, we find that reduced dust induced iron fertilisation in the Southern Ocean may be responsible for up to 40 ppm of the total atmospheric CO 2 increase during T1. During the last interglacial, ssNa + levels of EDC and EPICA Dronning Maud Land (EDML) are only half of the Holocene levels, in line with higher temperatures during that period, indicating much reduced sea ice extent in the Atlantic as well as ... Article in Journal/Newspaper Antarc* Antarctic Dronning Maud Land EPICA ice core Ross Sea Sea ice Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Southern Ocean Ross Sea Dronning Maud Land Talos Dome ENVELOPE(158.000,158.000,-73.000,-73.000) Climate of the Past 9 6 2789 2807 |
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 S. Schüpbach U. Federer P. R. Kaufmann S. Albani C. Barbante T. F. Stocker H. Fischer High-resolution mineral dust and sea ice proxy records from the Talos Dome ice core |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
In this study we report on new non-sea salt calcium (nssCa 2+ , mineral dust proxy) and sea salt sodium (ssNa + , sea ice proxy) records along the East Antarctic Talos Dome deep ice core in centennial resolution reaching back 150 thousand years (ka) before present. During glacial conditions nssCa 2+ fluxes in Talos Dome are strongly related to temperature as has been observed before in other deep Antarctic ice core records, and has been associated with synchronous changes in the main source region (southern South America) during climate variations in the last glacial. However, during warmer climate conditions Talos Dome mineral dust input is clearly elevated compared to other records mainly due to the contribution of additional local dust sources in the Ross Sea area. Based on a simple transport model, we compare nssCa 2+ fluxes of different East Antarctic ice cores. From this multi-site comparison we conclude that changes in transport efficiency or atmospheric lifetime of dust particles do have a minor effect compared to source strength changes on the large-scale concentration changes observed in Antarctic ice cores during climate variations of the past 150 ka. Our transport model applied on ice core data is further validated by climate model data. The availability of multiple East Antarctic nssCa 2+ records also allows for a revision of a former estimate on the atmospheric CO 2 sensitivity to reduced dust induced iron fertilisation in the Southern Ocean during the transition from the Last Glacial Maximum to the Holocene (T1). While a former estimate based on the EPICA Dome C (EDC) record only suggested 20 ppm, we find that reduced dust induced iron fertilisation in the Southern Ocean may be responsible for up to 40 ppm of the total atmospheric CO 2 increase during T1. During the last interglacial, ssNa + levels of EDC and EPICA Dronning Maud Land (EDML) are only half of the Holocene levels, in line with higher temperatures during that period, indicating much reduced sea ice extent in the Atlantic as well as ... |
format |
Article in Journal/Newspaper |
author |
S. Schüpbach U. Federer P. R. Kaufmann S. Albani C. Barbante T. F. Stocker H. Fischer |
author_facet |
S. Schüpbach U. Federer P. R. Kaufmann S. Albani C. Barbante T. F. Stocker H. Fischer |
author_sort |
S. Schüpbach |
title |
High-resolution mineral dust and sea ice proxy records from the Talos Dome ice core |
title_short |
High-resolution mineral dust and sea ice proxy records from the Talos Dome ice core |
title_full |
High-resolution mineral dust and sea ice proxy records from the Talos Dome ice core |
title_fullStr |
High-resolution mineral dust and sea ice proxy records from the Talos Dome ice core |
title_full_unstemmed |
High-resolution mineral dust and sea ice proxy records from the Talos Dome ice core |
title_sort |
high-resolution mineral dust and sea ice proxy records from the talos dome ice core |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/cp-9-2789-2013 https://doaj.org/article/0c8e1e6224814728b1f1aa48e5ec3314 |
long_lat |
ENVELOPE(158.000,158.000,-73.000,-73.000) |
geographic |
Antarctic Southern Ocean Ross Sea Dronning Maud Land Talos Dome |
geographic_facet |
Antarctic Southern Ocean Ross Sea Dronning Maud Land Talos Dome |
genre |
Antarc* Antarctic Dronning Maud Land EPICA ice core Ross Sea Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Dronning Maud Land EPICA ice core Ross Sea Sea ice Southern Ocean |
op_source |
Climate of the Past, Vol 9, Iss 6, Pp 2789-2807 (2013) |
op_relation |
http://www.clim-past.net/9/2789/2013/cp-9-2789-2013.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-9-2789-2013 https://doaj.org/article/0c8e1e6224814728b1f1aa48e5ec3314 |
op_doi |
https://doi.org/10.5194/cp-9-2789-2013 |
container_title |
Climate of the Past |
container_volume |
9 |
container_issue |
6 |
container_start_page |
2789 |
op_container_end_page |
2807 |
_version_ |
1766126314721378304 |