Articles | Volume 20, issue 12
https://doi.org/10.5194/cp-20-2685-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-20-2685-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Variations in the biological pump throughout the Miocene: evidence from organic carbon burial in Pacific Ocean sediments
College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, 104 CEOAS Admin Bldg, Corvallis, Oregon 97333, USA
Annette Olivarez Lyle
College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, 104 CEOAS Admin Bldg, Corvallis, Oregon 97333, USA
Related authors
Mitchell Lyle and Annette Olivarez Lyle
EGUsphere, https://doi.org/10.5194/egusphere-2026-3515, https://doi.org/10.5194/egusphere-2026-3515, 2026
This preprint is open for discussion and under review for Climate of the Past (CP).
Short summary
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Data from NW Pacific sediments explain anomalous CaCO3 burial patterns during glacial-interglacial cycles, opposite those of the rest of the Pacific. High CaCO3 coincides with Bering Strait flooding, allowing Pacific waters into the Arctic, and eventually to the North Atlantic. The pattern of response is consistent over multiple deglaciation cycles. Transport of icy waters through the Bering Strait allowed higher CaCO3 production and sedimentation near the Kamchatka margin.
Anna Joy Drury, Diederik Liebrand, Thomas Westerhold, Helen M. Beddow, David A. Hodell, Nina Rohlfs, Roy H. Wilkens, Mitchell Lyle, David B. Bell, Dick Kroon, Heiko Pälike, and Lucas J. Lourens
Clim. Past, 17, 2091–2117, https://doi.org/10.5194/cp-17-2091-2021, https://doi.org/10.5194/cp-17-2091-2021, 2021
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We use the first high-resolution southeast Atlantic carbonate record to see how climate dynamics evolved since 30 million years ago (Ma). During ~ 30–13 Ma, eccentricity (orbital circularity) paced carbonate deposition. After the mid-Miocene Climate Transition (~ 14 Ma), precession (Earth's tilt direction) increasingly drove carbonate variability. In the latest Miocene (~ 8 Ma), obliquity (Earth's tilt) pacing appeared, signalling increasing high-latitude influence.
Mitchell Lyle and Annette Olivarez Lyle
EGUsphere, https://doi.org/10.5194/egusphere-2026-3515, https://doi.org/10.5194/egusphere-2026-3515, 2026
This preprint is open for discussion and under review for Climate of the Past (CP).
Short summary
Short summary
Data from NW Pacific sediments explain anomalous CaCO3 burial patterns during glacial-interglacial cycles, opposite those of the rest of the Pacific. High CaCO3 coincides with Bering Strait flooding, allowing Pacific waters into the Arctic, and eventually to the North Atlantic. The pattern of response is consistent over multiple deglaciation cycles. Transport of icy waters through the Bering Strait allowed higher CaCO3 production and sedimentation near the Kamchatka margin.
Anna Joy Drury, Diederik Liebrand, Thomas Westerhold, Helen M. Beddow, David A. Hodell, Nina Rohlfs, Roy H. Wilkens, Mitchell Lyle, David B. Bell, Dick Kroon, Heiko Pälike, and Lucas J. Lourens
Clim. Past, 17, 2091–2117, https://doi.org/10.5194/cp-17-2091-2021, https://doi.org/10.5194/cp-17-2091-2021, 2021
Short summary
Short summary
We use the first high-resolution southeast Atlantic carbonate record to see how climate dynamics evolved since 30 million years ago (Ma). During ~ 30–13 Ma, eccentricity (orbital circularity) paced carbonate deposition. After the mid-Miocene Climate Transition (~ 14 Ma), precession (Earth's tilt direction) increasingly drove carbonate variability. In the latest Miocene (~ 8 Ma), obliquity (Earth's tilt) pacing appeared, signalling increasing high-latitude influence.
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Short summary
Greenhouse gases were key in maintaining past warm intervals, but feedbacks are needed to sustain high atmospheric CO2 levels. We assess whether changes in the ocean degradation depth of plankton-produced organic matter (particulate organic carbon – POC) affect ocean carbon storage. Limited POC burial in sediments during the Miocene Climate Optimum (MCO) warm interval, relative to recent periods, suggests poorer POC transfer to the abyss, leading to the MCO's higher atmospheric CO2 levels.
Greenhouse gases were key in maintaining past warm intervals, but feedbacks are needed to...