North Atlantic temperature control on deoxygenation in the northern tropical Pacific
Abstract Ocean oxygen content is decreasing with global change. A major challenge for modelling future declines in oxygen concentration is our lack of knowledge of the natural variability associated with marine oxygen inventory on interannual and multidecadal timescales. Here, we present 10 annually...
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ftdoajarticles:oai:doaj.org/article:a3ca02339d304ebe9827aebf81d71c9d 2024-09-30T14:39:13+00:00 North Atlantic temperature control on deoxygenation in the northern tropical Pacific Laetitia E. Pichevin Massimo Bollasina Alexandra J. Nederbragt Raja S. Ganeshram 2024-09-01T00:00:00Z https://doi.org/10.1038/s41467-024-52197-6 https://doaj.org/article/a3ca02339d304ebe9827aebf81d71c9d EN eng Nature Portfolio https://doi.org/10.1038/s41467-024-52197-6 https://doaj.org/toc/2041-1723 doi:10.1038/s41467-024-52197-6 2041-1723 https://doaj.org/article/a3ca02339d304ebe9827aebf81d71c9d Nature Communications, Vol 15, Iss 1, Pp 1-11 (2024) Science Q article 2024 ftdoajarticles https://doi.org/10.1038/s41467-024-52197-6 2024-09-17T16:00:43Z Abstract Ocean oxygen content is decreasing with global change. A major challenge for modelling future declines in oxygen concentration is our lack of knowledge of the natural variability associated with marine oxygen inventory on interannual and multidecadal timescales. Here, we present 10 annually resolved 200 year-long records of denitrification, a marker of deoxygenation, from a varved sedimentary archive in the North Pacific oxygen minimum zone covering key periods over the last glacial–interglacial cycle. Spectral analyses on these records reveal strong signals at periodicities typical of today’s Atlantic multidecadal oscillation. Modern subsurface circulation reanalyses regressed on the positive Atlantic and Pacific Climatic Oscillation indices further confirm that North Atlantic temperature patterns are the main control on the subsurface zonal circulation and therefore the most likely dominant driver of oxygen variability in the tropical Pacific. With currently increasing temperatures in the Northern Hemisphere high latitudes and North Atlantic, we suggest deoxygenation will intensify in the region. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Pacific Nature Communications 15 1 |
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Science Q Laetitia E. Pichevin Massimo Bollasina Alexandra J. Nederbragt Raja S. Ganeshram North Atlantic temperature control on deoxygenation in the northern tropical Pacific |
topic_facet |
Science Q |
description |
Abstract Ocean oxygen content is decreasing with global change. A major challenge for modelling future declines in oxygen concentration is our lack of knowledge of the natural variability associated with marine oxygen inventory on interannual and multidecadal timescales. Here, we present 10 annually resolved 200 year-long records of denitrification, a marker of deoxygenation, from a varved sedimentary archive in the North Pacific oxygen minimum zone covering key periods over the last glacial–interglacial cycle. Spectral analyses on these records reveal strong signals at periodicities typical of today’s Atlantic multidecadal oscillation. Modern subsurface circulation reanalyses regressed on the positive Atlantic and Pacific Climatic Oscillation indices further confirm that North Atlantic temperature patterns are the main control on the subsurface zonal circulation and therefore the most likely dominant driver of oxygen variability in the tropical Pacific. With currently increasing temperatures in the Northern Hemisphere high latitudes and North Atlantic, we suggest deoxygenation will intensify in the region. |
format |
Article in Journal/Newspaper |
author |
Laetitia E. Pichevin Massimo Bollasina Alexandra J. Nederbragt Raja S. Ganeshram |
author_facet |
Laetitia E. Pichevin Massimo Bollasina Alexandra J. Nederbragt Raja S. Ganeshram |
author_sort |
Laetitia E. Pichevin |
title |
North Atlantic temperature control on deoxygenation in the northern tropical Pacific |
title_short |
North Atlantic temperature control on deoxygenation in the northern tropical Pacific |
title_full |
North Atlantic temperature control on deoxygenation in the northern tropical Pacific |
title_fullStr |
North Atlantic temperature control on deoxygenation in the northern tropical Pacific |
title_full_unstemmed |
North Atlantic temperature control on deoxygenation in the northern tropical Pacific |
title_sort |
north atlantic temperature control on deoxygenation in the northern tropical pacific |
publisher |
Nature Portfolio |
publishDate |
2024 |
url |
https://doi.org/10.1038/s41467-024-52197-6 https://doaj.org/article/a3ca02339d304ebe9827aebf81d71c9d |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Nature Communications, Vol 15, Iss 1, Pp 1-11 (2024) |
op_relation |
https://doi.org/10.1038/s41467-024-52197-6 https://doaj.org/toc/2041-1723 doi:10.1038/s41467-024-52197-6 2041-1723 https://doaj.org/article/a3ca02339d304ebe9827aebf81d71c9d |
op_doi |
https://doi.org/10.1038/s41467-024-52197-6 |
container_title |
Nature Communications |
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15 |
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1 |
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1811641743077015552 |