Silicic acid cycling in the Bering Sea during the Mid‐Pleistocene Transition
This is the final version. Available from Wiley via the DOI in this record. Data Availability Statement: The data presented in this paper are stored in the Pangaea data repository (https://doi.pangaea.de/10.1594/ PANGAEA.933139) The rate of deep-ocean carbon burial is considered important for modula...
Published in: | Paleoceanography and Paleoclimatology |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley/American Geophysical Union
2022
|
Subjects: | |
Online Access: | http://hdl.handle.net/10871/128737 https://doi.org/10.1029/2021pa004284 |
id |
ftunivexeter:oai:ore.exeter.ac.uk:10871/128737 |
---|---|
record_format |
openpolar |
spelling |
ftunivexeter:oai:ore.exeter.ac.uk:10871/128737 2024-09-15T17:59:29+00:00 Silicic acid cycling in the Bering Sea during the Mid‐Pleistocene Transition Worne, S Swann, GEA Kender, S Lacey, JH Leng, MJ 2022 http://hdl.handle.net/10871/128737 https://doi.org/10.1029/2021pa004284 en eng Wiley/American Geophysical Union https://doi.pangaea.de/10.1594/ PANGAEA.933139 Paleoceanography and Paleoclimatology, 37(2) orcid:0000-0003-4216-3214 (Kender, Sev) Vol. 37, No. 2, article e2021PA004284 https://doi.org/10.1029/2021pa004284 ENV15362 GA/15S/003 IP-1740-0517 IP-1413-1113 http://hdl.handle.net/10871/128737 2572-4517 2572-4525 Paleoceanography and Paleoclimatology © 2022. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited https://creativecommons.org/licenses/by/4.0/ Article 2022 ftunivexeter https://doi.org/10.1029/2021pa004284 2024-07-29T03:24:14Z This is the final version. Available from Wiley via the DOI in this record. Data Availability Statement: The data presented in this paper are stored in the Pangaea data repository (https://doi.pangaea.de/10.1594/ PANGAEA.933139) The rate of deep-ocean carbon burial is considered important for modulating glacial-interglacial atmospheric CO2 concentrations and global climate during the Quaternary. It has been suggested that glacial iron fertilization and increased efficiency of the biological pump in the Southern Ocean since the Mid-Pleistocene Transition (MPT) was key in lowering atmospheric pCO2 and facilitating rapid land ice accumulation. There is growing evidence that a similar mechanism may have existed in the subarctic Pacific Ocean, although this has not yet been assessed. Here, the silicon isotope composition of diatoms (δ30Sidiatom) from the Bering Sea upwelling region is used to assess the role of nutrient cycling on the subarctic Pacific biological pump during the MPT. Results show that during and after the “900 kyr event,” the high productivity green belt zone was characterized by low silicic acid utilization but high supply, coincident with the dominance of diatom resting spores. We posit that as nutrient upwelling was suppressed following pack ice growth and expansion of glacial North Pacific Intermediate Water (GNPIW), primary productivity became nitrate-limited and enhanced opal remineralization caused a relative increase in silicic acid supply. However, preferential preservation and higher cellular carbon content of diatom resting spores, as well as increased supply of iron from expanded sea ice, likely sustained the net efficiency of the Bering Sea biological pump through the MPT. Remnant iron and silicic acid may also have propagated into the lower subarctic Pacific Ocean through GNPIW, aiding a regionally efficient biological pump at 900 kyr and during post-MPT glacials. Natural Environment Research Council British Geological Survey Natural Environment Research Council Natural ... Article in Journal/Newspaper Bering Sea Sea ice Southern Ocean Subarctic University of Exeter: Open Research Exeter (ORE) Paleoceanography and Paleoclimatology 37 2 |
institution |
Open Polar |
collection |
University of Exeter: Open Research Exeter (ORE) |
op_collection_id |
ftunivexeter |
language |
English |
description |
This is the final version. Available from Wiley via the DOI in this record. Data Availability Statement: The data presented in this paper are stored in the Pangaea data repository (https://doi.pangaea.de/10.1594/ PANGAEA.933139) The rate of deep-ocean carbon burial is considered important for modulating glacial-interglacial atmospheric CO2 concentrations and global climate during the Quaternary. It has been suggested that glacial iron fertilization and increased efficiency of the biological pump in the Southern Ocean since the Mid-Pleistocene Transition (MPT) was key in lowering atmospheric pCO2 and facilitating rapid land ice accumulation. There is growing evidence that a similar mechanism may have existed in the subarctic Pacific Ocean, although this has not yet been assessed. Here, the silicon isotope composition of diatoms (δ30Sidiatom) from the Bering Sea upwelling region is used to assess the role of nutrient cycling on the subarctic Pacific biological pump during the MPT. Results show that during and after the “900 kyr event,” the high productivity green belt zone was characterized by low silicic acid utilization but high supply, coincident with the dominance of diatom resting spores. We posit that as nutrient upwelling was suppressed following pack ice growth and expansion of glacial North Pacific Intermediate Water (GNPIW), primary productivity became nitrate-limited and enhanced opal remineralization caused a relative increase in silicic acid supply. However, preferential preservation and higher cellular carbon content of diatom resting spores, as well as increased supply of iron from expanded sea ice, likely sustained the net efficiency of the Bering Sea biological pump through the MPT. Remnant iron and silicic acid may also have propagated into the lower subarctic Pacific Ocean through GNPIW, aiding a regionally efficient biological pump at 900 kyr and during post-MPT glacials. Natural Environment Research Council British Geological Survey Natural Environment Research Council Natural ... |
format |
Article in Journal/Newspaper |
author |
Worne, S Swann, GEA Kender, S Lacey, JH Leng, MJ |
spellingShingle |
Worne, S Swann, GEA Kender, S Lacey, JH Leng, MJ Silicic acid cycling in the Bering Sea during the Mid‐Pleistocene Transition |
author_facet |
Worne, S Swann, GEA Kender, S Lacey, JH Leng, MJ |
author_sort |
Worne, S |
title |
Silicic acid cycling in the Bering Sea during the Mid‐Pleistocene Transition |
title_short |
Silicic acid cycling in the Bering Sea during the Mid‐Pleistocene Transition |
title_full |
Silicic acid cycling in the Bering Sea during the Mid‐Pleistocene Transition |
title_fullStr |
Silicic acid cycling in the Bering Sea during the Mid‐Pleistocene Transition |
title_full_unstemmed |
Silicic acid cycling in the Bering Sea during the Mid‐Pleistocene Transition |
title_sort |
silicic acid cycling in the bering sea during the mid‐pleistocene transition |
publisher |
Wiley/American Geophysical Union |
publishDate |
2022 |
url |
http://hdl.handle.net/10871/128737 https://doi.org/10.1029/2021pa004284 |
genre |
Bering Sea Sea ice Southern Ocean Subarctic |
genre_facet |
Bering Sea Sea ice Southern Ocean Subarctic |
op_relation |
https://doi.pangaea.de/10.1594/ PANGAEA.933139 Paleoceanography and Paleoclimatology, 37(2) orcid:0000-0003-4216-3214 (Kender, Sev) Vol. 37, No. 2, article e2021PA004284 https://doi.org/10.1029/2021pa004284 ENV15362 GA/15S/003 IP-1740-0517 IP-1413-1113 http://hdl.handle.net/10871/128737 2572-4517 2572-4525 Paleoceanography and Paleoclimatology |
op_rights |
© 2022. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1029/2021pa004284 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
37 |
container_issue |
2 |
_version_ |
1810436586076110848 |