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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ftdatacite:10.7892/boris.47748 2023-05-15T13:54:54+02:00 High-resolution mineral dust and sea ice proxy records from the Talos Dome ice core Kaufmann, Patrik Federer, Urs Schüpbach, Simon Barbante, C. Albani, S. Stocker, Thomas Fischer, Hubertus 2013 application/pdf https://dx.doi.org/10.7892/boris.47748 http://boris.unibe.ch/47748/ en eng Copernicus Publications info:eu-repo/semantics/openAccess 530 Physics Text article-journal ScholarlyArticle 2013 ftdatacite https://doi.org/10.7892/boris.47748 2021-11-05T12:55:41Z 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 Ocean sector of the Southern Ocean. In contrast, Holocene ssNa+ flux in Talos Dome is about the same as during the last interglacial, indicating that there was similar ice cover present in the Ross Sea area during MIS 5.5 as during the Holocene. Text Antarc* Antarctic Dronning Maud Land EPICA ice core Ross Sea Sea ice Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Antarctic Southern Ocean Ross Sea Dronning Maud Land Indian Talos Dome ENVELOPE(158.000,158.000,-73.000,-73.000) |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
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ftdatacite |
language |
English |
topic |
530 Physics |
spellingShingle |
530 Physics Kaufmann, Patrik Federer, Urs Schüpbach, Simon Barbante, C. Albani, S. 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 Ocean sector of the Southern Ocean. In contrast, Holocene ssNa+ flux in Talos Dome is about the same as during the last interglacial, indicating that there was similar ice cover present in the Ross Sea area during MIS 5.5 as during the Holocene. |
format |
Text |
author |
Kaufmann, Patrik Federer, Urs Schüpbach, Simon Barbante, C. Albani, S. Stocker, Thomas Fischer, Hubertus |
author_facet |
Kaufmann, Patrik Federer, Urs Schüpbach, Simon Barbante, C. Albani, S. Stocker, Thomas Fischer, Hubertus |
author_sort |
Kaufmann, Patrik |
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://dx.doi.org/10.7892/boris.47748 http://boris.unibe.ch/47748/ |
long_lat |
ENVELOPE(158.000,158.000,-73.000,-73.000) |
geographic |
Antarctic Southern Ocean Ross Sea Dronning Maud Land Indian Talos Dome |
geographic_facet |
Antarctic Southern Ocean Ross Sea Dronning Maud Land Indian 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_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.7892/boris.47748 |
_version_ |
1766261103421030400 |