Radiocarbon, isotope, biogenic, and 230Th measurements for sediment core RC10-196
The subarctic North Pacific Ocean holds a large CO2 reservoir that is currently isolated from the atmosphere by a low-salinity layer. It has recently been hypothesized that the reorganization of these high-CO2 waters may have played a crucial role in the degassing of carbon dioxide to the atmosphere...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.772835 2023-05-15T17:32:34+02:00 Radiocarbon, isotope, biogenic, and 230Th measurements for sediment core RC10-196 Kohfeld, Karen E Chase, Zanna LATITUDE: 54.700000 * LONGITUDE: 177.080000 * DATE/TIME START: 1966-07-10T00:00:00 * DATE/TIME END: 1966-07-10T00:00:00 2011-12-15 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.772835 https://doi.org/10.1594/PANGAEA.772835 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.772835 https://doi.org/10.1594/PANGAEA.772835 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Kohfeld, Karen E; Chase, Zanna (2011): Controls on deglacial changes in biogenic fluxes in the North Pacific Ocean. Quaternary Science Reviews, 30(23-24), 3350-3363, https://doi.org/10.1016/j.quascirev.2011.08.007 PC Piston corer RC10 RC10-196 Robert Conrad Dataset 2011 ftpangaea https://doi.org/10.1594/PANGAEA.772835 https://doi.org/10.1016/j.quascirev.2011.08.007 2023-01-20T07:32:21Z The subarctic North Pacific Ocean holds a large CO2 reservoir that is currently isolated from the atmosphere by a low-salinity layer. It has recently been hypothesized that the reorganization of these high-CO2 waters may have played a crucial role in the degassing of carbon dioxide to the atmosphere during the last deglaciation. This reorganization would leave some imprint on paleo-productivity records. Here we present 230Th-normalized biogenic fluxes from an intermediate depth sediment core in the Northwest Pacific (RC10-196, 54.7°N, 177.1°E, 1007 m) and place them within the context of a synthesis of previously-published biogenic flux data from 49 deep-sea cores north of 20°N, ranging from 420 to 3968 m water depth. The 230Th-normalized opal, carbonate, and organic carbon fluxes from RC10-196 peak approximately 13,000 calendar years BP during the Bølling/Allerød (B/A) period. Our data synthesis suggests that biogenic fluxes were in general lowest during the last glacial period, increased somewhat in the Northwest Pacific during Heinrich Event 1, and reached a maximum across the entire North Pacific during the B/A period. We evaluate several mechanisms as possible drivers of deglacial change in biogenic fluxes in the North Pacific, including changes in preservation, sediment focusing, sea ice extent, iron inputs, stratification, and circulation shifts initiated in the North Atlantic and North Pacific. Our analysis suggests that while micronutrient sources likely contributed to some of the observed changes, the heterogeneity in timing of glaciogenic retreat and sea level make these mechanisms unlikely causes of region-wide contemporaneous peaks in export production. We argue that paleo-observations are most consistent with ventilation increases in both the North Pacific (during H1) and North Atlantic (during B/A) being the primary drivers of increases in biogenic flux during the deglaciation, as respectively they were likely to bring nutrients to the surface via increased vertical mixing and shoaling of the ... Dataset North Atlantic Sea ice Subarctic PANGAEA - Data Publisher for Earth & Environmental Science Pacific ENVELOPE(177.080000,177.080000,54.700000,54.700000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
PC Piston corer RC10 RC10-196 Robert Conrad |
spellingShingle |
PC Piston corer RC10 RC10-196 Robert Conrad Kohfeld, Karen E Chase, Zanna Radiocarbon, isotope, biogenic, and 230Th measurements for sediment core RC10-196 |
topic_facet |
PC Piston corer RC10 RC10-196 Robert Conrad |
description |
The subarctic North Pacific Ocean holds a large CO2 reservoir that is currently isolated from the atmosphere by a low-salinity layer. It has recently been hypothesized that the reorganization of these high-CO2 waters may have played a crucial role in the degassing of carbon dioxide to the atmosphere during the last deglaciation. This reorganization would leave some imprint on paleo-productivity records. Here we present 230Th-normalized biogenic fluxes from an intermediate depth sediment core in the Northwest Pacific (RC10-196, 54.7°N, 177.1°E, 1007 m) and place them within the context of a synthesis of previously-published biogenic flux data from 49 deep-sea cores north of 20°N, ranging from 420 to 3968 m water depth. The 230Th-normalized opal, carbonate, and organic carbon fluxes from RC10-196 peak approximately 13,000 calendar years BP during the Bølling/Allerød (B/A) period. Our data synthesis suggests that biogenic fluxes were in general lowest during the last glacial period, increased somewhat in the Northwest Pacific during Heinrich Event 1, and reached a maximum across the entire North Pacific during the B/A period. We evaluate several mechanisms as possible drivers of deglacial change in biogenic fluxes in the North Pacific, including changes in preservation, sediment focusing, sea ice extent, iron inputs, stratification, and circulation shifts initiated in the North Atlantic and North Pacific. Our analysis suggests that while micronutrient sources likely contributed to some of the observed changes, the heterogeneity in timing of glaciogenic retreat and sea level make these mechanisms unlikely causes of region-wide contemporaneous peaks in export production. We argue that paleo-observations are most consistent with ventilation increases in both the North Pacific (during H1) and North Atlantic (during B/A) being the primary drivers of increases in biogenic flux during the deglaciation, as respectively they were likely to bring nutrients to the surface via increased vertical mixing and shoaling of the ... |
format |
Dataset |
author |
Kohfeld, Karen E Chase, Zanna |
author_facet |
Kohfeld, Karen E Chase, Zanna |
author_sort |
Kohfeld, Karen E |
title |
Radiocarbon, isotope, biogenic, and 230Th measurements for sediment core RC10-196 |
title_short |
Radiocarbon, isotope, biogenic, and 230Th measurements for sediment core RC10-196 |
title_full |
Radiocarbon, isotope, biogenic, and 230Th measurements for sediment core RC10-196 |
title_fullStr |
Radiocarbon, isotope, biogenic, and 230Th measurements for sediment core RC10-196 |
title_full_unstemmed |
Radiocarbon, isotope, biogenic, and 230Th measurements for sediment core RC10-196 |
title_sort |
radiocarbon, isotope, biogenic, and 230th measurements for sediment core rc10-196 |
publisher |
PANGAEA |
publishDate |
2011 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.772835 https://doi.org/10.1594/PANGAEA.772835 |
op_coverage |
LATITUDE: 54.700000 * LONGITUDE: 177.080000 * DATE/TIME START: 1966-07-10T00:00:00 * DATE/TIME END: 1966-07-10T00:00:00 |
long_lat |
ENVELOPE(177.080000,177.080000,54.700000,54.700000) |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic Sea ice Subarctic |
genre_facet |
North Atlantic Sea ice Subarctic |
op_source |
Supplement to: Kohfeld, Karen E; Chase, Zanna (2011): Controls on deglacial changes in biogenic fluxes in the North Pacific Ocean. Quaternary Science Reviews, 30(23-24), 3350-3363, https://doi.org/10.1016/j.quascirev.2011.08.007 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.772835 https://doi.org/10.1594/PANGAEA.772835 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.772835 https://doi.org/10.1016/j.quascirev.2011.08.007 |
_version_ |
1766130748709928960 |