Decadal to interdecadal variability of the North Atlantic Oscillation : a paleoclimatic index reconstruction
The study aims to extend the wintertime index of the North Atlantic Oscillation (NAO) using paleoclimatic data. The primary interest lies in the decadal and interdecadal variability. Isotopic concentrations and accumulation rates measured in ice cores, and tree-ring widths chronologies form the prox...
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ftoceanrep:oai:oceanrep.geomar.de:1244 2024-09-15T18:09:54+00:00 Decadal to interdecadal variability of the North Atlantic Oscillation : a paleoclimatic index reconstruction Timm, Oliver 2003 text https://oceanrep.geomar.de/id/eprint/1244/ https://oceanrep.geomar.de/id/eprint/1244/1/d932.pdf https://macau.uni-kiel.de/receive/diss_mods_00000932 en eng https://oceanrep.geomar.de/id/eprint/1244/1/d932.pdf Timm, O. (2003) Decadal to interdecadal variability of the North Atlantic Oscillation : a paleoclimatic index reconstruction. Open Access (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, Germany, 111 pp. cc_by_3.0 info:eu-repo/semantics/openAccess Thesis NonPeerReviewed 2003 ftoceanrep 2024-06-25T20:59:50Z The study aims to extend the wintertime index of the North Atlantic Oscillation (NAO) using paleoclimatic data. The primary interest lies in the decadal and interdecadal variability. Isotopic concentrations and accumulation rates measured in ice cores, and tree-ring widths chronologies form the proxy basis for the NAO index reconstruction. This multiproxy data set includes proxies from Greenland, Europe, North Africa and North America. The statistical treatment of the reconstruction problem is discussed in detail. Two different reconstruction strategies are presented for the decadal to interdecadal time scales: the pre- and post-filtering concepts. The decadal (interdecadal) variability is reconstructed over the period 1700-1978 (1623-1966). The comparison with two independent reconstructions of other research groups hint at an anomalous pattern of atmospheric variability in the North Atlantic sector in the early 18th century. The magnitude of the variance was probably increased by solar or volcanic forcing during this period. On interdecadal time scales (32-64 years), an increased variability was reconstructed over the 17th and early 18th century. If further indicators supported these findings, then the recent trend in the NAO index, from negative values in the 1960-70s to prolonged positive values since the 1980s, would be in the range of natural variability. Thesis Greenland North Atlantic North Atlantic oscillation OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
The study aims to extend the wintertime index of the North Atlantic Oscillation (NAO) using paleoclimatic data. The primary interest lies in the decadal and interdecadal variability. Isotopic concentrations and accumulation rates measured in ice cores, and tree-ring widths chronologies form the proxy basis for the NAO index reconstruction. This multiproxy data set includes proxies from Greenland, Europe, North Africa and North America. The statistical treatment of the reconstruction problem is discussed in detail. Two different reconstruction strategies are presented for the decadal to interdecadal time scales: the pre- and post-filtering concepts. The decadal (interdecadal) variability is reconstructed over the period 1700-1978 (1623-1966). The comparison with two independent reconstructions of other research groups hint at an anomalous pattern of atmospheric variability in the North Atlantic sector in the early 18th century. The magnitude of the variance was probably increased by solar or volcanic forcing during this period. On interdecadal time scales (32-64 years), an increased variability was reconstructed over the 17th and early 18th century. If further indicators supported these findings, then the recent trend in the NAO index, from negative values in the 1960-70s to prolonged positive values since the 1980s, would be in the range of natural variability. |
format |
Thesis |
author |
Timm, Oliver |
spellingShingle |
Timm, Oliver Decadal to interdecadal variability of the North Atlantic Oscillation : a paleoclimatic index reconstruction |
author_facet |
Timm, Oliver |
author_sort |
Timm, Oliver |
title |
Decadal to interdecadal variability of the North Atlantic Oscillation : a paleoclimatic index reconstruction |
title_short |
Decadal to interdecadal variability of the North Atlantic Oscillation : a paleoclimatic index reconstruction |
title_full |
Decadal to interdecadal variability of the North Atlantic Oscillation : a paleoclimatic index reconstruction |
title_fullStr |
Decadal to interdecadal variability of the North Atlantic Oscillation : a paleoclimatic index reconstruction |
title_full_unstemmed |
Decadal to interdecadal variability of the North Atlantic Oscillation : a paleoclimatic index reconstruction |
title_sort |
decadal to interdecadal variability of the north atlantic oscillation : a paleoclimatic index reconstruction |
publishDate |
2003 |
url |
https://oceanrep.geomar.de/id/eprint/1244/ https://oceanrep.geomar.de/id/eprint/1244/1/d932.pdf https://macau.uni-kiel.de/receive/diss_mods_00000932 |
genre |
Greenland North Atlantic North Atlantic oscillation |
genre_facet |
Greenland North Atlantic North Atlantic oscillation |
op_relation |
https://oceanrep.geomar.de/id/eprint/1244/1/d932.pdf Timm, O. (2003) Decadal to interdecadal variability of the North Atlantic Oscillation : a paleoclimatic index reconstruction. Open Access (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, Germany, 111 pp. |
op_rights |
cc_by_3.0 info:eu-repo/semantics/openAccess |
_version_ |
1810447507923140608 |