Causes and Timing of Recurring Subarctic Pacific Hypoxia
Several North Pacific studies of the last deglaciation show hypoxia throughout the ocean margins and attribute this phenomenon to the effects of abrupt warming and meltwater inputs. Yet, because of the lack of long records spanning multiple glacial cycles and deglaciation events, it is unclear wheth...
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ftstthomasuniv:oai:ir.stthomas.edu:cas_stats_pub-1015 2023-07-30T04:07:09+02:00 Causes and Timing of Recurring Subarctic Pacific Hypoxia Knudson, Karla Ravelo, Ana Aiello, Ivano Knudson, Christina Drake, Michelle Sakamoto, Tatsuhiko 2021-01-01T08:00:00Z https://ir.stthomas.edu/cas_stats_pub/16 https://doi.org/10.1126/sciadv.abg2906 unknown UST Research Online https://ir.stthomas.edu/cas_stats_pub/16 doi:10.1126/sciadv.abg2906 https://doi.org/10.1126/sciadv.abg2906 Statistics Faculty Publications text 2021 ftstthomasuniv https://doi.org/10.1126/sciadv.abg2906 2023-07-17T18:34:00Z Several North Pacific studies of the last deglaciation show hypoxia throughout the ocean margins and attribute this phenomenon to the effects of abrupt warming and meltwater inputs. Yet, because of the lack of long records spanning multiple glacial cycles and deglaciation events, it is unclear whether deoxygenation was a regular occurrence of warming events and whether deglaciation and/or other conditions promoted hypoxia throughout time. Here, subarctic Pacific laminated sediments from the past 1.2 million years demonstrate that hypoxic events recurred throughout the Pleistocene as episodes of highly productive phytoplankton growth and were generally associated with interglacial climates, high sea levels, and enhanced nitrate utilization—but not with deglaciations. We suggest that hypoxia was typically stimulated by high productivity from iron fertilization facilitated by redox- remobilized iron from flooded continental shelves. Text Subarctic University of St. Thomas: UST Research Online Pacific Science Advances 7 23 |
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University of St. Thomas: UST Research Online |
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Several North Pacific studies of the last deglaciation show hypoxia throughout the ocean margins and attribute this phenomenon to the effects of abrupt warming and meltwater inputs. Yet, because of the lack of long records spanning multiple glacial cycles and deglaciation events, it is unclear whether deoxygenation was a regular occurrence of warming events and whether deglaciation and/or other conditions promoted hypoxia throughout time. Here, subarctic Pacific laminated sediments from the past 1.2 million years demonstrate that hypoxic events recurred throughout the Pleistocene as episodes of highly productive phytoplankton growth and were generally associated with interglacial climates, high sea levels, and enhanced nitrate utilization—but not with deglaciations. We suggest that hypoxia was typically stimulated by high productivity from iron fertilization facilitated by redox- remobilized iron from flooded continental shelves. |
format |
Text |
author |
Knudson, Karla Ravelo, Ana Aiello, Ivano Knudson, Christina Drake, Michelle Sakamoto, Tatsuhiko |
spellingShingle |
Knudson, Karla Ravelo, Ana Aiello, Ivano Knudson, Christina Drake, Michelle Sakamoto, Tatsuhiko Causes and Timing of Recurring Subarctic Pacific Hypoxia |
author_facet |
Knudson, Karla Ravelo, Ana Aiello, Ivano Knudson, Christina Drake, Michelle Sakamoto, Tatsuhiko |
author_sort |
Knudson, Karla |
title |
Causes and Timing of Recurring Subarctic Pacific Hypoxia |
title_short |
Causes and Timing of Recurring Subarctic Pacific Hypoxia |
title_full |
Causes and Timing of Recurring Subarctic Pacific Hypoxia |
title_fullStr |
Causes and Timing of Recurring Subarctic Pacific Hypoxia |
title_full_unstemmed |
Causes and Timing of Recurring Subarctic Pacific Hypoxia |
title_sort |
causes and timing of recurring subarctic pacific hypoxia |
publisher |
UST Research Online |
publishDate |
2021 |
url |
https://ir.stthomas.edu/cas_stats_pub/16 https://doi.org/10.1126/sciadv.abg2906 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
Statistics Faculty Publications |
op_relation |
https://ir.stthomas.edu/cas_stats_pub/16 doi:10.1126/sciadv.abg2906 https://doi.org/10.1126/sciadv.abg2906 |
op_doi |
https://doi.org/10.1126/sciadv.abg2906 |
container_title |
Science Advances |
container_volume |
7 |
container_issue |
23 |
_version_ |
1772820278129197056 |