Efficient biological carbon export to the mesopelagic ocean induced by submesoscale fronts

Mingxian Guo, Xiaogang Xing, Peng Xiu (), Giorgio Dall’Olmo, Weifang Chen and Fei Chai
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Mingxian Guo: Chinese Academy of Sciences
Xiaogang Xing: Ministry of Natural Resources
Peng Xiu: Xiamen University
Giorgio Dall’Olmo: Istituto Nazionale di Oceanografia e di Geofisica Sperimentale—OGS
Weifang Chen: Xiamen University
Fei Chai: Xiamen University

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Oceanic submesoscale processes are ubiquitous in the North Pacific Subtropical Gyre (NPSG), where the biological carbon pump is generally ineffective. Due to difficulties in collecting continuous observations, however, it remains uncertain whether episodic submesoscale processes can drive significant changes in particulate organic carbon (POC) export into the mesopelagic ocean. Here we present observations from high-frequency Biogeochemical-Argo floats in the NPSG, which captured the enhanced POC export fluxes during the intensifying stages of a submesoscale front and a cyclonic eddy compared to their other life stages. A higher percentage of POC export flux was found to be transferred to the base of mesopelagic layer at the front compared to that at the intensifying eddy and the mean of previous studies (37% vs. ~10%), suggesting that the POC export efficiency was significantly strengthened by submesoscale dynamics. Such findings highlight the importance of submesoscale fronts for carbon export and sequestration in subtropical gyres.

Date: 2024
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DOI: 10.1038/s41467-024-44846-7

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