Fully and accurately reconstructing changes in oceanic productivity and carbon export and their controls is critical to determining the efficiency of the biological pump and its role in the global carbon cycle through time, particularly in modern CO2 source regions like the eastern equatorial Pacific (EEP). Here we present new high-resolution records of sedimentary 230Th-normalized opal and nannofossil carbonate fluxes and [231Pa/230Th]xs ratios from site MV1014-02-17JC in the Panama Basin. We find that, across the last deglaciation, phytoplankton community structure is driven by changing patterns of nutrient (nitrate, iron, and silica) availability which, in turn, are caused by variability in the position of the Intertropical Convergence Zone (ITCZ) and associated changes in biogeochemical cycling and circulation in the Southern Ocean. Our multi-proxy work suggests greater scrutiny is required in the interpretation of common geochemical proxies of productivity and carbon export in the EEP.
© The Author(s) 2022
This article is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
Article states: "Radiocarbon, [231Pa/230Th]xs, opal flux, and carbonate flux data will be archived at the National Oceanic and Atmospheric Administration National Centers for Environmental Information (NCEI) database upon publication and are also available as a supplement to this manuscript."
"The online version contains supplementary material available at https://doi.org/10.1038/s41598-022-26593-1."
Original Publication Citation
Schimmenti, D., Marcantonio, F., Hayes, C.T., Hertzberg, J., Schmidt, M., & Sarao, J. (2022) Insights into the deglacoal variability of phytoplankton community structure in the eastern equatorial Pacific Ocean using [231Pa/230Th]xs and opal-carbonate fluxes. Scientific Reports, 12(1), 1-12, Article 22258. https://doi.org/10.1038/s41598-022-26593-1
Schimmenti, Danielle; Marcantonio, Franco; Hayes, Christopher T.; Hertzberg, Jennifer; Schmidt, Matthew; and Sarao, John, "Insights Into the Deglacial Variability of Phytoplankton Community Structure in the Eastern Equatorial Pacific Ocean Using [231Pa/230Th]xs and Opal-Carbonate Fluxes" (2022). OES Faculty Publications. 472.