Late Quaternary paleoproductivity history on the Vancouver Island margin, western Canada: a multiproxy geochemical studyThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network .
Multiproxy analysis of a 38 m long sediment core recovered from the Vancouver Island margin (48.97°N, 127.04°W, water depth 1243 m) has yielded a millennial-scale history of upwelling and export production over the last ∼50 ka. Higher concentrations of marine organic carbon, opal, and trace Mo sugge...
Published in: | Canadian Journal of Earth Sciences |
---|---|
Main Authors: | , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
2008
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/e08-038 http://www.nrcresearchpress.com/doi/full-xml/10.1139/E08-038 http://www.nrcresearchpress.com/doi/pdf/10.1139/E08-038 |
id |
crcansciencepubl:10.1139/e08-038 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/e08-038 2023-12-17T10:31:04+01:00 Late Quaternary paleoproductivity history on the Vancouver Island margin, western Canada: a multiproxy geochemical studyThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network . Chang, Alice S. Pedersen, Thomas F. Hendy, Ingrid L. Hollings, Pete 2008 http://dx.doi.org/10.1139/e08-038 http://www.nrcresearchpress.com/doi/full-xml/10.1139/E08-038 http://www.nrcresearchpress.com/doi/pdf/10.1139/E08-038 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 45, issue 11, page 1283-1297 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2008 crcansciencepubl https://doi.org/10.1139/e08-038 2023-11-19T13:38:51Z Multiproxy analysis of a 38 m long sediment core recovered from the Vancouver Island margin (48.97°N, 127.04°W, water depth 1243 m) has yielded a millennial-scale history of upwelling and export production over the last ∼50 ka. Higher concentrations of marine organic carbon, opal, and trace Mo suggest that production was higher, and sedimentary pore waters more anoxic, during the warm Holocene, Bølling–Allerød, and interstadial events between 31 and 44 ka BP. Relatively lower production and higher inputs of terrigenous organic matter occurred during the last glacial (14.7–31 ka BP; Cordilleran ice sheet proximal to coring site at ∼19.5 ka BP) and from 44–50.4 ka BP. Enrichments in sedimentary δ 15 N during interstadial events are interpreted to reflect episodic delivery and upwelling of isotopically heavy nitrate to the surface waters and subsequent vectoring to the seafloor via settling planktonic detritus. Similar patterns are seen in southern California and other areas along the western margin of North America, implying that heavier nitrate generated by denitrification in the Eastern Tropical North Pacific has in the past been carried northward in the California Undercurrent at least as far as central Vancouver Island. This inference is consistent with modern hydrographic observations in the region. Comparison of the coherent Vancouver Island, Oregon, California, and northwest Mexico margin records with late Pleistocene climate history in Greenland reinforces the conclusion that a tight physical and biogeochemical coupling has existed for at least 50 ka between the North Atlantic and North American margin waters, including those off Vancouver Island. Article in Journal/Newspaper Greenland Ice Sheet North Atlantic Canadian Science Publishing (via Crossref) Canada Greenland Pacific Canadian Journal of Earth Sciences 45 11 1283 1297 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Chang, Alice S. Pedersen, Thomas F. Hendy, Ingrid L. Late Quaternary paleoproductivity history on the Vancouver Island margin, western Canada: a multiproxy geochemical studyThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network . |
topic_facet |
General Earth and Planetary Sciences |
description |
Multiproxy analysis of a 38 m long sediment core recovered from the Vancouver Island margin (48.97°N, 127.04°W, water depth 1243 m) has yielded a millennial-scale history of upwelling and export production over the last ∼50 ka. Higher concentrations of marine organic carbon, opal, and trace Mo suggest that production was higher, and sedimentary pore waters more anoxic, during the warm Holocene, Bølling–Allerød, and interstadial events between 31 and 44 ka BP. Relatively lower production and higher inputs of terrigenous organic matter occurred during the last glacial (14.7–31 ka BP; Cordilleran ice sheet proximal to coring site at ∼19.5 ka BP) and from 44–50.4 ka BP. Enrichments in sedimentary δ 15 N during interstadial events are interpreted to reflect episodic delivery and upwelling of isotopically heavy nitrate to the surface waters and subsequent vectoring to the seafloor via settling planktonic detritus. Similar patterns are seen in southern California and other areas along the western margin of North America, implying that heavier nitrate generated by denitrification in the Eastern Tropical North Pacific has in the past been carried northward in the California Undercurrent at least as far as central Vancouver Island. This inference is consistent with modern hydrographic observations in the region. Comparison of the coherent Vancouver Island, Oregon, California, and northwest Mexico margin records with late Pleistocene climate history in Greenland reinforces the conclusion that a tight physical and biogeochemical coupling has existed for at least 50 ka between the North Atlantic and North American margin waters, including those off Vancouver Island. |
author2 |
Hollings, Pete |
format |
Article in Journal/Newspaper |
author |
Chang, Alice S. Pedersen, Thomas F. Hendy, Ingrid L. |
author_facet |
Chang, Alice S. Pedersen, Thomas F. Hendy, Ingrid L. |
author_sort |
Chang, Alice S. |
title |
Late Quaternary paleoproductivity history on the Vancouver Island margin, western Canada: a multiproxy geochemical studyThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network . |
title_short |
Late Quaternary paleoproductivity history on the Vancouver Island margin, western Canada: a multiproxy geochemical studyThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network . |
title_full |
Late Quaternary paleoproductivity history on the Vancouver Island margin, western Canada: a multiproxy geochemical studyThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network . |
title_fullStr |
Late Quaternary paleoproductivity history on the Vancouver Island margin, western Canada: a multiproxy geochemical studyThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network . |
title_full_unstemmed |
Late Quaternary paleoproductivity history on the Vancouver Island margin, western Canada: a multiproxy geochemical studyThis article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network . |
title_sort |
late quaternary paleoproductivity history on the vancouver island margin, western canada: a multiproxy geochemical studythis 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/e08-038 http://www.nrcresearchpress.com/doi/full-xml/10.1139/E08-038 http://www.nrcresearchpress.com/doi/pdf/10.1139/E08-038 |
geographic |
Canada Greenland Pacific |
geographic_facet |
Canada Greenland Pacific |
genre |
Greenland Ice Sheet North Atlantic |
genre_facet |
Greenland Ice Sheet North Atlantic |
op_source |
Canadian Journal of Earth Sciences volume 45, issue 11, page 1283-1297 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e08-038 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
45 |
container_issue |
11 |
container_start_page |
1283 |
op_container_end_page |
1297 |
_version_ |
1785584222322294784 |