Geochemical reconstruction of Pacific decadal variability from the eastern North Pacific during the HoloceneThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network.
Determining climate variations over the Holocene requires high-resolution records with well-developed age models. A 40 m long marine sediment core raised from Effingham Inlet, an anoxic fjord on the west coast of Vancouver Island, British Columbia, Canada, yields such a record. Forty six 14 C accele...
Published in: | Canadian Journal of Earth Sciences |
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crcansciencepubl:10.1139/e08-037 2024-09-09T18:56:48+00:00 Geochemical reconstruction of Pacific decadal variability from the eastern North Pacific during the HoloceneThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network. Ivanochko, Tara S. Calvert, Stephen E. Thomson, Richard E. Pedersen, Thomas F. Hollings, P. 2008 http://dx.doi.org/10.1139/e08-037 http://www.nrcresearchpress.com/doi/full-xml/10.1139/E08-037 http://www.nrcresearchpress.com/doi/pdf/10.1139/E08-037 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 45, issue 11, page 1317-1329 ISSN 0008-4077 1480-3313 journal-article 2008 crcansciencepubl https://doi.org/10.1139/e08-037 2024-07-25T04:10:03Z Determining climate variations over the Holocene requires high-resolution records with well-developed age models. A 40 m long marine sediment core raised from Effingham Inlet, an anoxic fjord on the west coast of Vancouver Island, British Columbia, Canada, yields such a record. Forty six 14 C accelerator mass spectrometry (AMS) dates determined from terrestrial plant material form the age model. Downcore sampling at both 5 cm (20 year) and 1.5 cm (7 year) resolution indicates that high-frequency oceanographic variability has prevailed at this site over the last 10 000 years. Spectral analysis of wt.% opal, a proxy for diatom productivity in the basin, reveals the bidecadal and pentadecadal periods of the Pacific decadal oscillation (PDO) – North Pacific index (NPI) that are related to changes in the strength of the Aleutian Low. Coherence analysis between the Effingham Inlet data and δ 18 O records from Jellybean Lake (a high elevation site in southwest Yukon) indicates regional coherence at periods of 45, 70, and 510 years between productivity in Effingham Inlet and changes in the Aleutian Low strength. Over the entire Holocene, the strength of decadal variability has changed. Both 20- and 50-year periods are present to some degree in the early Holocene, and only the 50 year period is evident in the late Holocene. These data imply that regime shifts would have been more frequent in the early Holocene relative to the last several thousand years. Article in Journal/Newspaper aleutian low Yukon Canadian Science Publishing Yukon Canada Pacific British Columbia ENVELOPE(-125.003,-125.003,54.000,54.000) Canadian Journal of Earth Sciences 45 11 1317 1329 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
Determining climate variations over the Holocene requires high-resolution records with well-developed age models. A 40 m long marine sediment core raised from Effingham Inlet, an anoxic fjord on the west coast of Vancouver Island, British Columbia, Canada, yields such a record. Forty six 14 C accelerator mass spectrometry (AMS) dates determined from terrestrial plant material form the age model. Downcore sampling at both 5 cm (20 year) and 1.5 cm (7 year) resolution indicates that high-frequency oceanographic variability has prevailed at this site over the last 10 000 years. Spectral analysis of wt.% opal, a proxy for diatom productivity in the basin, reveals the bidecadal and pentadecadal periods of the Pacific decadal oscillation (PDO) – North Pacific index (NPI) that are related to changes in the strength of the Aleutian Low. Coherence analysis between the Effingham Inlet data and δ 18 O records from Jellybean Lake (a high elevation site in southwest Yukon) indicates regional coherence at periods of 45, 70, and 510 years between productivity in Effingham Inlet and changes in the Aleutian Low strength. Over the entire Holocene, the strength of decadal variability has changed. Both 20- and 50-year periods are present to some degree in the early Holocene, and only the 50 year period is evident in the late Holocene. These data imply that regime shifts would have been more frequent in the early Holocene relative to the last several thousand years. |
author2 |
Hollings, P. |
format |
Article in Journal/Newspaper |
author |
Ivanochko, Tara S. Calvert, Stephen E. Thomson, Richard E. Pedersen, Thomas F. |
spellingShingle |
Ivanochko, Tara S. Calvert, Stephen E. Thomson, Richard E. Pedersen, Thomas F. Geochemical reconstruction of Pacific decadal variability from the eastern North Pacific during the HoloceneThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network. |
author_facet |
Ivanochko, Tara S. Calvert, Stephen E. Thomson, Richard E. Pedersen, Thomas F. |
author_sort |
Ivanochko, Tara S. |
title |
Geochemical reconstruction of Pacific decadal variability from the eastern North Pacific during the HoloceneThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network. |
title_short |
Geochemical reconstruction of Pacific decadal variability from the eastern North Pacific during the HoloceneThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network. |
title_full |
Geochemical reconstruction of Pacific decadal variability from the eastern North Pacific during the HoloceneThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network. |
title_fullStr |
Geochemical reconstruction of Pacific decadal variability from the eastern North Pacific during the HoloceneThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network. |
title_full_unstemmed |
Geochemical reconstruction of Pacific decadal variability from the eastern North Pacific during the HoloceneThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network. |
title_sort |
geochemical reconstruction of pacific decadal variability from the eastern north pacific during the holocenethis article is one of a series of papers published in this special issue on the theme polar climate stability network. |
publisher |
Canadian Science Publishing |
publishDate |
2008 |
url |
http://dx.doi.org/10.1139/e08-037 http://www.nrcresearchpress.com/doi/full-xml/10.1139/E08-037 http://www.nrcresearchpress.com/doi/pdf/10.1139/E08-037 |
long_lat |
ENVELOPE(-125.003,-125.003,54.000,54.000) |
geographic |
Yukon Canada Pacific British Columbia |
geographic_facet |
Yukon Canada Pacific British Columbia |
genre |
aleutian low Yukon |
genre_facet |
aleutian low Yukon |
op_source |
Canadian Journal of Earth Sciences volume 45, issue 11, page 1317-1329 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e08-037 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
45 |
container_issue |
11 |
container_start_page |
1317 |
op_container_end_page |
1329 |
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