Bølling-Allerød productivity in the subarctic Pacific driven by seasonal upwelling
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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.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Bølling-Allerød productivity in the subarctic Pacific driven by seasonal upwelling |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/2024GL109614 |
| Volume | 52 |
| Issue | 4 |
| Publication Date | April 26, 2025 |
| Year Published | 2025 |
| Language | English |
| Publisher | American Geophysical Union |
| Contributing office(s) | Geology, Minerals, Energy, and Geophysics Science Center |
| Description | e2024GL109614, 12 p. |
| Other Geospatial | subarctic Pacific |