Bølling‐Allerød Productivity in the Subarctic Pacific Driven by Seasonal Upwelling
Abstract The Bølling‐Allerød deglacial event is marked by high diatom productivity and opal deposition throughout the subarctic Pacific. This opal could either constitute a strengthened biological pump and thus carbon sequestration, or a weakened biological pump and release of marine‐sequestered CO2...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2025-04-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL109614 |
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| author | K. A. DeLong T. Blackburn B. Caissie J. Addison Z. Stroynowski M. R. Sipala F. Marcantonio A. C. Ravelo |
| author_facet | K. A. DeLong T. Blackburn B. Caissie J. Addison Z. Stroynowski M. R. Sipala F. Marcantonio A. C. Ravelo |
| author_sort | K. A. DeLong |
| collection | DOAJ |
| description | Abstract The Bølling‐Allerød deglacial event is marked by high diatom productivity and opal deposition throughout the subarctic Pacific. This opal could either constitute a strengthened biological pump and thus carbon sequestration, or a weakened biological pump and release of marine‐sequestered CO2 to the atmosphere. We quantify silicic acid supply at IODP Site U1340 in the Bering Sea using biogenic opal and δ30Si of Coscinodiscus, a diatom genus. These records, along with diatom environmental indicators, suggest the Bølling‐Allerød had high silicic acid availability related to a shift from stratification to seasonal upwelling dynamics. We thus propose the primary cause of the high productivity event was increased macronutrient supply from vertical exchange that injected old, nutrient‐rich, CO2‐rich waters into the surface. Enhanced CO2 release from the subarctic Pacific may help explain critical intervals of CO2 rise that occur at the onsets of the Bølling‐Allerød and PreBoreal. |
| format | Article |
| id | doaj-art-08956ece78d449ffa2637c43021c3621 |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-08956ece78d449ffa2637c43021c36212025-08-20T03:39:04ZengWileyGeophysical Research Letters0094-82761944-80072025-04-01528n/an/a10.1029/2024GL109614Bølling‐Allerød Productivity in the Subarctic Pacific Driven by Seasonal UpwellingK. A. DeLong0T. Blackburn1B. Caissie2J. Addison3Z. Stroynowski4M. R. Sipala5F. Marcantonio6A. C. Ravelo7Ocean Sciences Department University of California Santa Cruz Santa Cruz CA USAEarth and Planetary Sciences Department University of California Santa Cruz Santa Cruz CA USAOcean Sciences Department University of California Santa Cruz Santa Cruz CA USAU. S. Geological Survey Moffett Field CA USACCMAR Faro PortugalOcean Sciences Department University of California Santa Cruz Santa Cruz CA USADepartment of Geology and Geophysics Texas A&M University College Station TX USAOcean Sciences Department University of California Santa Cruz Santa Cruz CA USAAbstract The Bølling‐Allerød deglacial event is marked by high diatom productivity and opal deposition throughout the subarctic Pacific. This opal could either constitute a strengthened biological pump and thus carbon sequestration, or a weakened biological pump and release of marine‐sequestered CO2 to the atmosphere. We quantify silicic acid supply at IODP Site U1340 in the Bering Sea using biogenic opal and δ30Si of Coscinodiscus, a diatom genus. These records, along with diatom environmental indicators, suggest the Bølling‐Allerød had high silicic acid availability related to a shift from stratification to seasonal upwelling dynamics. We thus propose the primary cause of the high productivity event was increased macronutrient supply from vertical exchange that injected old, nutrient‐rich, CO2‐rich waters into the surface. Enhanced CO2 release from the subarctic Pacific may help explain critical intervals of CO2 rise that occur at the onsets of the Bølling‐Allerød and PreBoreal.https://doi.org/10.1029/2024GL109614productivityopalpaleoceanographydiatompaleoclimategeochemistry |
| spellingShingle | K. A. DeLong T. Blackburn B. Caissie J. Addison Z. Stroynowski M. R. Sipala F. Marcantonio A. C. Ravelo Bølling‐Allerød Productivity in the Subarctic Pacific Driven by Seasonal Upwelling Geophysical Research Letters productivity opal paleoceanography diatom paleoclimate geochemistry |
| title | Bølling‐Allerød Productivity in the Subarctic Pacific Driven by Seasonal Upwelling |
| title_full | Bølling‐Allerød Productivity in the Subarctic Pacific Driven by Seasonal Upwelling |
| title_fullStr | Bølling‐Allerød Productivity in the Subarctic Pacific Driven by Seasonal Upwelling |
| title_full_unstemmed | Bølling‐Allerød Productivity in the Subarctic Pacific Driven by Seasonal Upwelling |
| title_short | Bølling‐Allerød Productivity in the Subarctic Pacific Driven by Seasonal Upwelling |
| title_sort | bolling allerod productivity in the subarctic pacific driven by seasonal upwelling |
| topic | productivity opal paleoceanography diatom paleoclimate geochemistry |
| url | https://doi.org/10.1029/2024GL109614 |
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