Precessional pacing of tropical ocean carbon export during the Late Cretaceous
-
Published:2022-12-16
Issue:12
Volume:18
Page:2631-2641
-
ISSN:1814-9332
-
Container-title:Climate of the Past
-
language:en
-
Short-container-title:Clim. Past
Author:
Kim Ji-EunORCID, Westerhold ThomasORCID, Alegret Laia, Drury Anna JoyORCID, Röhl UrsulaORCID, Griffith Elizabeth M.ORCID
Abstract
Abstract. The marine biological carbon pump, which exports organic carbon out of the surface ocean, plays an essential role in sequestering carbon from the atmosphere, thus impacting climate and affecting marine ecosystems. Orbital variations in solar insolation modulate these processes, but their influence on the tropical Pacific during the Late Cretaceous is unknown. Here we present a high-resolution composite record of elemental barium from deep-sea sediments as a proxy for organic carbon export out of the surface oceans (i.e., export production) from Shatsky Rise in the tropical Pacific. Variations in export production in the Pacific during the Maastrichtian, from 71.5 to 66 million years ago, were dominated by precession and less so by eccentricity modulation or obliquity, confirming that tropical surface-ocean carbon dynamics were influenced by seasonal insolation in the tropics during this greenhouse period. We suggest that precession paced primary production in the tropical Pacific and recycling in the euphotic zone by changing water column stratification, upwelling intensity, and continental nutrient fluxes. Benthic foraminiferal accumulation rates covaried with export production, providing evidence for bentho-pelagic coupling of the marine biological carbon pump across these high-frequency changes in a cool greenhouse planet.
Funder
Deutsche Forschungsgemeinschaft Ministerio de Economía y Competitividad National Science Foundation
Publisher
Copernicus GmbH
Subject
Paleontology,Stratigraphy,Global and Planetary Change
Reference70 articles.
1. Alegret, L. and Thomas, E.: Food supply to the seafloor in the Pacific Ocean
after the Cretaceous/Paleogene boundary event, Mar. Micropaleontol., 73,
105–116, https://doi.org/10.1016/j.marmicro.2009.07.005, 2009. 2. Alegret, L., Thomas, E., and Lohmann, K. C.: End-Cretaceous marine mass
extinction not caused by productivity collapse, P. Natl. Acad. Sci. USA, 109,
728–732, https://doi.org/10.1073/pnas.1110601109, 2012. 3. Alegret, L., Arreguín-Rodríguez, G. J., Trasviña-Moreno, C.
A., and Thomas, E.: Turnover and stability in the deep sea: Benthic
foraminifera as tracers of Paleogene global change, Global Planet. Change, 196, 103372, https://doi.org/10.1016/j.gloplacha.2020.103372, 2020. 4. Barnet, J. S., Littler, K., Kroon, D., Leng, M. J., Westerhold, T.,
Röhl, U., and Zachos, J. C.: A new high-resolution chronology for the
Late Maastrichtian warming event: Establishing robust temporal links with
the onset of Deccan volcanism, Geology, 46, 147–150, 2018. 5. Barnet, J. S., Littler, K., Westerhold, T., Kroon, D., Leng, M. J., Bailey,
I., Röhl, U., and Zachos, J. C.: A high-fidelity benthic stable isotope
record of Late Cretaceous–Early Eocene climate change and carbon-cycling,
Paleoceanography and Paleoclimatology, 34, 672–691, 2019.
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|