Glacio-chemical study spanning the past 2 kyr on three ice cores from Dronning Maud Land, Antarctica: 2. Seasonally resolved chemical records
The ammonium, calcium, and sodium concentrations from three intermediate depth ice cores drilled in the area of Dronning Maud Land, East Antarctica, have been investigated. Since all measurements were performed by a high-resolution Continuous Flow Analysis system, for the first time seasonal signals...
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ftunivbern:oai:boris.unibe.ch:158735 2023-08-20T04:01:39+02:00 Glacio-chemical study spanning the past 2 kyr on three ice cores from Dronning Maud Land, Antarctica: 2. Seasonally resolved chemical records Sommer, S. Wagenbach, D. Mulvaney, R. Fischer, H. 2000 application/pdf https://boris.unibe.ch/158735/1/sommer00jgr_b.pdf https://boris.unibe.ch/158735/ eng eng American Geophysical Union https://boris.unibe.ch/158735/ info:eu-repo/semantics/openAccess Sommer, S.; Wagenbach, D.; Mulvaney, R.; Fischer, H. (2000). Glacio-chemical study spanning the past 2 kyr on three ice cores from Dronning Maud Land, Antarctica: 2. Seasonally resolved chemical records. Journal of Geophysical Research: Atmospheres, 105(D24), pp. 29423-29433. American Geophysical Union 10.1029/2000JD900450 <http://dx.doi.org/10.1029/2000JD900450> 530 Physics info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2000 ftunivbern https://doi.org/10.1029/2000JD900450 2023-07-31T22:08:19Z The ammonium, calcium, and sodium concentrations from three intermediate depth ice cores drilled in the area of Dronning Maud Land, East Antarctica, have been investigated. Since all measurements were performed by a high-resolution Continuous Flow Analysis system, for the first time seasonal signals of chemical trace species could be obtained from the interior of central Antarctica over a period of approximately 2 millennia. Although the elevation as well as the accumulation rate differ between the drilling sites, similar values were obtained by comparing mean concentrations spanning the last 900 years. However, a distinct lack of intersite correlation was found on decadal timescales. Despite a noticeable accumulation change, apparent in one core, no significant concentration change of all three species has occurred. All the measured ions show clear seasonal signals over the whole records. While the sea-salt-related component sodium peaks simultaneously with calcium, the maximum ammonium concentration occurs in the snow with a time lag of 2 months after the sea-salt peak. More than 60% of the calcium concentration can be attributed to an ocean source. Elevated sodium concentrations were found within this millennium compared to mean values of the whole records, but the spatially varying shape of the increase suggests that a possible climatic signal is biased by local deposition effects. Article in Journal/Newspaper Antarc* Antarctica Dronning Maud Land East Antarctica BORIS (Bern Open Repository and Information System, University of Bern) Dronning Maud Land East Antarctica Journal of Geophysical Research: Atmospheres 105 D24 29423 29433 |
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 Sommer, S. Wagenbach, D. Mulvaney, R. Fischer, H. Glacio-chemical study spanning the past 2 kyr on three ice cores from Dronning Maud Land, Antarctica: 2. Seasonally resolved chemical records |
topic_facet |
530 Physics |
description |
The ammonium, calcium, and sodium concentrations from three intermediate depth ice cores drilled in the area of Dronning Maud Land, East Antarctica, have been investigated. Since all measurements were performed by a high-resolution Continuous Flow Analysis system, for the first time seasonal signals of chemical trace species could be obtained from the interior of central Antarctica over a period of approximately 2 millennia. Although the elevation as well as the accumulation rate differ between the drilling sites, similar values were obtained by comparing mean concentrations spanning the last 900 years. However, a distinct lack of intersite correlation was found on decadal timescales. Despite a noticeable accumulation change, apparent in one core, no significant concentration change of all three species has occurred. All the measured ions show clear seasonal signals over the whole records. While the sea-salt-related component sodium peaks simultaneously with calcium, the maximum ammonium concentration occurs in the snow with a time lag of 2 months after the sea-salt peak. More than 60% of the calcium concentration can be attributed to an ocean source. Elevated sodium concentrations were found within this millennium compared to mean values of the whole records, but the spatially varying shape of the increase suggests that a possible climatic signal is biased by local deposition effects. |
format |
Article in Journal/Newspaper |
author |
Sommer, S. Wagenbach, D. Mulvaney, R. Fischer, H. |
author_facet |
Sommer, S. Wagenbach, D. Mulvaney, R. Fischer, H. |
author_sort |
Sommer, S. |
title |
Glacio-chemical study spanning the past 2 kyr on three ice cores from Dronning Maud Land, Antarctica: 2. Seasonally resolved chemical records |
title_short |
Glacio-chemical study spanning the past 2 kyr on three ice cores from Dronning Maud Land, Antarctica: 2. Seasonally resolved chemical records |
title_full |
Glacio-chemical study spanning the past 2 kyr on three ice cores from Dronning Maud Land, Antarctica: 2. Seasonally resolved chemical records |
title_fullStr |
Glacio-chemical study spanning the past 2 kyr on three ice cores from Dronning Maud Land, Antarctica: 2. Seasonally resolved chemical records |
title_full_unstemmed |
Glacio-chemical study spanning the past 2 kyr on three ice cores from Dronning Maud Land, Antarctica: 2. Seasonally resolved chemical records |
title_sort |
glacio-chemical study spanning the past 2 kyr on three ice cores from dronning maud land, antarctica: 2. seasonally resolved chemical records |
publisher |
American Geophysical Union |
publishDate |
2000 |
url |
https://boris.unibe.ch/158735/1/sommer00jgr_b.pdf https://boris.unibe.ch/158735/ |
geographic |
Dronning Maud Land East Antarctica |
geographic_facet |
Dronning Maud Land East Antarctica |
genre |
Antarc* Antarctica Dronning Maud Land East Antarctica |
genre_facet |
Antarc* Antarctica Dronning Maud Land East Antarctica |
op_source |
Sommer, S.; Wagenbach, D.; Mulvaney, R.; Fischer, H. (2000). Glacio-chemical study spanning the past 2 kyr on three ice cores from Dronning Maud Land, Antarctica: 2. Seasonally resolved chemical records. Journal of Geophysical Research: Atmospheres, 105(D24), pp. 29423-29433. American Geophysical Union 10.1029/2000JD900450 <http://dx.doi.org/10.1029/2000JD900450> |
op_relation |
https://boris.unibe.ch/158735/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2000JD900450 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
105 |
container_issue |
D24 |
container_start_page |
29423 |
op_container_end_page |
29433 |
_version_ |
1774724906146070528 |