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 (nssCa2+, 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 nssCa2+ flux...
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ftunivbern:oai:boris.unibe.ch:47748 2023-08-20T04:02:00+02:00 High-resolution mineral dust and sea ice proxy records from the Talos Dome ice core Schüpbach, Simon Federer, Urs Kaufmann, Patrik Albani, S. Barbante, C. Stocker, Thomas Fischer, Hubertus 2013 application/pdf https://boris.unibe.ch/47748/1/cp-9-2789-2013.pdf https://boris.unibe.ch/47748/ eng eng Copernicus Publications https://boris.unibe.ch/47748/ info:eu-repo/semantics/openAccess Schüpbach, Simon; Federer, Urs; Kaufmann, Patrik; Albani, S.; Barbante, C.; Stocker, Thomas; Fischer, Hubertus (2013). High-resolution mineral dust and sea ice proxy records from the Talos Dome ice core. Climate of the past, 9(6), pp. 2789-2807. Copernicus Publications 10.5194/cp-9-2789-2013 <http://dx.doi.org/10.5194/cp-9-2789-2013> 530 Physics info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2013 ftunivbern https://doi.org/10.5194/cp-9-2789-2013 2023-07-31T21:06:02Z In this study we report on new non-sea salt calcium (nssCa2+, 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 nssCa2+ 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 nssCa2+ 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 nssCa2+ records also allows for a revision of a former estimate on the atmospheric CO2 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 CO2 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 the Indian ... Article in Journal/Newspaper Antarc* Antarctic Dronning Maud Land EPICA ice core Ross Sea Sea ice Southern Ocean BORIS (Bern Open Repository and Information System, University of Bern) Antarctic Dronning Maud Land Indian Ross Sea Southern Ocean Talos Dome ENVELOPE(158.000,158.000,-73.000,-73.000) Climate of the Past 9 6 2789 2807 |
institution |
Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
topic |
530 Physics |
spellingShingle |
530 Physics Schüpbach, Simon Federer, Urs Kaufmann, Patrik Albani, S. Barbante, C. Stocker, Thomas Fischer, Hubertus High-resolution mineral dust and sea ice proxy records from the Talos Dome ice core |
topic_facet |
530 Physics |
description |
In this study we report on new non-sea salt calcium (nssCa2+, 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 nssCa2+ 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 nssCa2+ 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 nssCa2+ records also allows for a revision of a former estimate on the atmospheric CO2 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 CO2 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 the Indian ... |
format |
Article in Journal/Newspaper |
author |
Schüpbach, Simon Federer, Urs Kaufmann, Patrik Albani, S. Barbante, C. Stocker, Thomas Fischer, Hubertus |
author_facet |
Schüpbach, Simon Federer, Urs Kaufmann, Patrik Albani, S. Barbante, C. Stocker, Thomas Fischer, Hubertus |
author_sort |
Schüpbach, Simon |
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://boris.unibe.ch/47748/1/cp-9-2789-2013.pdf https://boris.unibe.ch/47748/ |
long_lat |
ENVELOPE(158.000,158.000,-73.000,-73.000) |
geographic |
Antarctic Dronning Maud Land Indian Ross Sea Southern Ocean Talos Dome |
geographic_facet |
Antarctic Dronning Maud Land Indian Ross Sea Southern Ocean 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 |
Schüpbach, Simon; Federer, Urs; Kaufmann, Patrik; Albani, S.; Barbante, C.; Stocker, Thomas; Fischer, Hubertus (2013). High-resolution mineral dust and sea ice proxy records from the Talos Dome ice core. Climate of the past, 9(6), pp. 2789-2807. Copernicus Publications 10.5194/cp-9-2789-2013 <http://dx.doi.org/10.5194/cp-9-2789-2013> |
op_relation |
https://boris.unibe.ch/47748/ |
op_rights |
info:eu-repo/semantics/openAccess |
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_ |
1774712382686232576 |