Extracting the annual signal from Greenland ice-core chemistry and isotopic records
Udgivelsesdato: 1. january Stratigraphic dating of ice cores by identification and counting of annual cycles in, for example, chemical measurements requires skill and experience. The work presented here investigates a method of data enhancement which is a first step towards an automated and more obj...
Published in: | Annals of Glaciology |
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Online Access: | https://curis.ku.dk/portal/da/publications/extracting-the-annual-signal-from-greenland-icecore-chemistry-and-isotopic-records(2b5df9c0-74c5-11db-bee9-02004c4f4f50).html https://doi.org/10.3189/172756402781817310 |
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ftcopenhagenunip:oai:pure.atira.dk:publications/2b5df9c0-74c5-11db-bee9-02004c4f4f50 2023-06-18T03:36:04+02:00 Extracting the annual signal from Greenland ice-core chemistry and isotopic records Rasmussen, Sune Olander Andersen, Katrine K. Andersen, Marie Louise Siggaard Clausen, Henrik Brink 2002 https://curis.ku.dk/portal/da/publications/extracting-the-annual-signal-from-greenland-icecore-chemistry-and-isotopic-records(2b5df9c0-74c5-11db-bee9-02004c4f4f50).html https://doi.org/10.3189/172756402781817310 eng eng info:eu-repo/semantics/closedAccess Rasmussen , S O , Andersen , K K , Andersen , M L S & Clausen , H B 2002 , ' Extracting the annual signal from Greenland ice-core chemistry and isotopic records ' , Annals of Glaciology , vol. 35 , no. 1 , pp. 131-135 . https://doi.org/10.3189/172756402781817310 article 2002 ftcopenhagenunip https://doi.org/10.3189/172756402781817310 2023-06-07T23:07:52Z Udgivelsesdato: 1. january Stratigraphic dating of ice cores by identification and counting of annual cycles in, for example, chemical measurements requires skill and experience. The work presented here investigates a method of data enhancement which is a first step towards an automated and more objective method of annual-layer counting. The method of dynamical decorrelation is briefly introduced and is applied to data from Site D and NorthGRIP in central Greenland. With this method the measured data series are decomposed into a number of independent source series, one of which exhibits a more pronounced annual variation than the input data themselves. The annual variation is more regular in that (1) some double and triple peaks in the measured series are replaced by single peaks in the extracted signal, and (2) the resulting annual peaks have a much more uniform height. A simplemethod of determining the number of annualpeaks in a series is set up. Using this method, it is shown that it is easier to determine the number of annual peaks in the series produced by dynamical decorrelation than in the original data series. Dynamical decorrelation may thus be used to improve data series prior to dating. Article in Journal/Newspaper Annals of Glaciology Greenland Greenland ice core ice core University of Copenhagen: Research Greenland Annals of Glaciology 35 131 135 |
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Open Polar |
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University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
description |
Udgivelsesdato: 1. january Stratigraphic dating of ice cores by identification and counting of annual cycles in, for example, chemical measurements requires skill and experience. The work presented here investigates a method of data enhancement which is a first step towards an automated and more objective method of annual-layer counting. The method of dynamical decorrelation is briefly introduced and is applied to data from Site D and NorthGRIP in central Greenland. With this method the measured data series are decomposed into a number of independent source series, one of which exhibits a more pronounced annual variation than the input data themselves. The annual variation is more regular in that (1) some double and triple peaks in the measured series are replaced by single peaks in the extracted signal, and (2) the resulting annual peaks have a much more uniform height. A simplemethod of determining the number of annualpeaks in a series is set up. Using this method, it is shown that it is easier to determine the number of annual peaks in the series produced by dynamical decorrelation than in the original data series. Dynamical decorrelation may thus be used to improve data series prior to dating. |
format |
Article in Journal/Newspaper |
author |
Rasmussen, Sune Olander Andersen, Katrine K. Andersen, Marie Louise Siggaard Clausen, Henrik Brink |
spellingShingle |
Rasmussen, Sune Olander Andersen, Katrine K. Andersen, Marie Louise Siggaard Clausen, Henrik Brink Extracting the annual signal from Greenland ice-core chemistry and isotopic records |
author_facet |
Rasmussen, Sune Olander Andersen, Katrine K. Andersen, Marie Louise Siggaard Clausen, Henrik Brink |
author_sort |
Rasmussen, Sune Olander |
title |
Extracting the annual signal from Greenland ice-core chemistry and isotopic records |
title_short |
Extracting the annual signal from Greenland ice-core chemistry and isotopic records |
title_full |
Extracting the annual signal from Greenland ice-core chemistry and isotopic records |
title_fullStr |
Extracting the annual signal from Greenland ice-core chemistry and isotopic records |
title_full_unstemmed |
Extracting the annual signal from Greenland ice-core chemistry and isotopic records |
title_sort |
extracting the annual signal from greenland ice-core chemistry and isotopic records |
publishDate |
2002 |
url |
https://curis.ku.dk/portal/da/publications/extracting-the-annual-signal-from-greenland-icecore-chemistry-and-isotopic-records(2b5df9c0-74c5-11db-bee9-02004c4f4f50).html https://doi.org/10.3189/172756402781817310 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Annals of Glaciology Greenland Greenland ice core ice core |
genre_facet |
Annals of Glaciology Greenland Greenland ice core ice core |
op_source |
Rasmussen , S O , Andersen , K K , Andersen , M L S & Clausen , H B 2002 , ' Extracting the annual signal from Greenland ice-core chemistry and isotopic records ' , Annals of Glaciology , vol. 35 , no. 1 , pp. 131-135 . https://doi.org/10.3189/172756402781817310 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.3189/172756402781817310 |
container_title |
Annals of Glaciology |
container_volume |
35 |
container_start_page |
131 |
op_container_end_page |
135 |
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1769004679011762176 |