Long‐Term Variability in Pliocene North Pacific Ocean Export Production and Its Implications for Ocean Circulation in a Warmer World
Abstract Unlike in the high‐latitude North Atlantic, no deep water is formed in the modern subarctic North Pacific. It has previously been suggested that during climate states different from today, this dichotomy did not endure, and the formation of North Pacific Deepwater (NPDW) occurred in the sub...
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ftdoajarticles:oai:doaj.org/article:5a4ab41464464641bdd1a5f344f7cb2b 2023-10-01T03:58:02+02:00 Long‐Term Variability in Pliocene North Pacific Ocean Export Production and Its Implications for Ocean Circulation in a Warmer World Jordan T. Abell Gisela Winckler 2023-08-01T00:00:00Z https://doi.org/10.1029/2022AV000853 https://doaj.org/article/5a4ab41464464641bdd1a5f344f7cb2b EN eng Wiley https://doi.org/10.1029/2022AV000853 https://doaj.org/toc/2576-604X 2576-604X doi:10.1029/2022AV000853 https://doaj.org/article/5a4ab41464464641bdd1a5f344f7cb2b AGU Advances, Vol 4, Iss 4, Pp n/a-n/a (2023) subarctic North Pacific Pliocene North Pacific Deep Water constant flux proxy Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 article 2023 ftdoajarticles https://doi.org/10.1029/2022AV000853 2023-09-03T00:54:18Z Abstract Unlike in the high‐latitude North Atlantic, no deep water is formed in the modern subarctic North Pacific. It has previously been suggested that during climate states different from today, this dichotomy did not endure, and the formation of North Pacific Deepwater (NPDW) occurred in the subarctic North Pacific, which supported an active Pacific meridional overturning circulation (PMOC). Here we provide new records of productivity and sedimentary redox conditions from the central subarctic North Pacific spanning the late Miocene to early Pleistocene. These reconstructions indicate greater‐than‐modern and temporally varying North Pacific export production across the interval of ∼2.7–6 Ma. Our time series, combined with previously published data sets and model output for Pliocene North Pacific Ocean dynamics, support the presence of an active PMOC during the Pliocene, and suggest that the characteristics of NPDW formation varied during this warmer interval of Earth's history. This finding of elevated export production at a time of deep water formation presents a conundrum when considering Quaternary North Pacific Ocean dynamics, where subarctic North Pacific productivity declines during intervals when enhanced overturning is posited to occur. We evaluate our data considering the caveats of both (i.e., Pliocene and Quaternary North Pacific circulation) hypotheses, as well as additional mechanisms unrelated to ocean circulation. Because the Pliocene is a possible analogue for near‐future climate, our results and analyses have important ramifications for our understanding of regional and global climate in the coming decades as the planet continues to warm. Article in Journal/Newspaper North Atlantic Subarctic Directory of Open Access Journals: DOAJ Articles Pacific AGU Advances 4 4 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
subarctic North Pacific Pliocene North Pacific Deep Water constant flux proxy Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
subarctic North Pacific Pliocene North Pacific Deep Water constant flux proxy Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 Jordan T. Abell Gisela Winckler Long‐Term Variability in Pliocene North Pacific Ocean Export Production and Its Implications for Ocean Circulation in a Warmer World |
topic_facet |
subarctic North Pacific Pliocene North Pacific Deep Water constant flux proxy Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 |
description |
Abstract Unlike in the high‐latitude North Atlantic, no deep water is formed in the modern subarctic North Pacific. It has previously been suggested that during climate states different from today, this dichotomy did not endure, and the formation of North Pacific Deepwater (NPDW) occurred in the subarctic North Pacific, which supported an active Pacific meridional overturning circulation (PMOC). Here we provide new records of productivity and sedimentary redox conditions from the central subarctic North Pacific spanning the late Miocene to early Pleistocene. These reconstructions indicate greater‐than‐modern and temporally varying North Pacific export production across the interval of ∼2.7–6 Ma. Our time series, combined with previously published data sets and model output for Pliocene North Pacific Ocean dynamics, support the presence of an active PMOC during the Pliocene, and suggest that the characteristics of NPDW formation varied during this warmer interval of Earth's history. This finding of elevated export production at a time of deep water formation presents a conundrum when considering Quaternary North Pacific Ocean dynamics, where subarctic North Pacific productivity declines during intervals when enhanced overturning is posited to occur. We evaluate our data considering the caveats of both (i.e., Pliocene and Quaternary North Pacific circulation) hypotheses, as well as additional mechanisms unrelated to ocean circulation. Because the Pliocene is a possible analogue for near‐future climate, our results and analyses have important ramifications for our understanding of regional and global climate in the coming decades as the planet continues to warm. |
format |
Article in Journal/Newspaper |
author |
Jordan T. Abell Gisela Winckler |
author_facet |
Jordan T. Abell Gisela Winckler |
author_sort |
Jordan T. Abell |
title |
Long‐Term Variability in Pliocene North Pacific Ocean Export Production and Its Implications for Ocean Circulation in a Warmer World |
title_short |
Long‐Term Variability in Pliocene North Pacific Ocean Export Production and Its Implications for Ocean Circulation in a Warmer World |
title_full |
Long‐Term Variability in Pliocene North Pacific Ocean Export Production and Its Implications for Ocean Circulation in a Warmer World |
title_fullStr |
Long‐Term Variability in Pliocene North Pacific Ocean Export Production and Its Implications for Ocean Circulation in a Warmer World |
title_full_unstemmed |
Long‐Term Variability in Pliocene North Pacific Ocean Export Production and Its Implications for Ocean Circulation in a Warmer World |
title_sort |
long‐term variability in pliocene north pacific ocean export production and its implications for ocean circulation in a warmer world |
publisher |
Wiley |
publishDate |
2023 |
url |
https://doi.org/10.1029/2022AV000853 https://doaj.org/article/5a4ab41464464641bdd1a5f344f7cb2b |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic Subarctic |
genre_facet |
North Atlantic Subarctic |
op_source |
AGU Advances, Vol 4, Iss 4, Pp n/a-n/a (2023) |
op_relation |
https://doi.org/10.1029/2022AV000853 https://doaj.org/toc/2576-604X 2576-604X doi:10.1029/2022AV000853 https://doaj.org/article/5a4ab41464464641bdd1a5f344f7cb2b |
op_doi |
https://doi.org/10.1029/2022AV000853 |
container_title |
AGU Advances |
container_volume |
4 |
container_issue |
4 |
_version_ |
1778530419510083584 |