Ocean Circulation Modulating the Nutricline at Regional and Fine scales: A Case Study in The Northwestern Mediterranean Sea

2025 · doi:10.22541/au.176463275.55019718/v1
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This preprint investigated how ocean circulation influences vertical nutrient structure in the oligotrophic North Balearic Front during spring 2023, using SWOT satellite observations combined with targeted Lagrangian sampling across a 50 km domain and within a fine-scale anticyclonic eddy. High-resolution nutrient profiles showed a two-level pattern: at the regional scale, northern waters had shallower nutriclines and steeper vertical nutrient gradients, while at finer scales the anticyclonic eddy had deeper nutriclines and weaker gradients than surrounding waters. A local relationship between SWOT sea surface height and nutricline depth was reported, linking physical fine-scale structures to nutrient dynamics. The paper is a preprint and explicitly notes that it has not been peer reviewed, and data may be preliminary. The paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.

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Abstract

In oligotrophic regions like the Mediterranean Sea, vertical nutrient distribution plays a key role in controlling primary production via upward fluxes. In spring 2023, the BioSWOT-Med campaign explored how fine-scale ocean dynamics modulate nutrient availability in the North Balearic Front. Combining SWOT satellite observations with targeted Lagrangian sampling, the study focused on a 50 km domain encompassing contrasting water masses at and across the front, and a fine-scale anticyclonic eddy embedded within southern waters. High-resolution nutrient profiles revealed a clear two-level structure: at the regional scale, northern waters showed shallower nutriclines and steeper vertical nutrient gradients; at finer scale, the anticyclonic eddy exhibited even deeper clines and weaker gradients compared to its surroundings. A local relation between SWOT sea surface height and the nutricline highlighted the coupling between physical fine-scale structures and nutrient dynamics, with further implications for un- derstanding nutrient supply and biogeochemical functioning in oligotrophic marine sys- tems.
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Abstract

In oligotrophic regions like the Mediterranean Sea, vertical nutrient distribution plays a key role in controlling primary production via upward fluxes. In spring 2023, the BioSWOT-Med campaign explored how fine-scale ocean dynamics modulate nutrient availability in the North Balearic Front. Combining SWOT satellite observations with targeted Lagrangian sampling, the study focused on a 50 km domain encompassing contrasting water masses at and across the front, and a fine-scale anticyclonic eddy embedded within southern waters. High-resolution nutrient profiles revealed a clear two-level structure: at the regional scale, northern waters showed shallower nutriclines and steeper vertical nutrient gradients; at finer scale, the anticyclonic eddy exhibited even deeper clines and weaker gradients compared to its surroundings. A local relation between SWOT sea surface height and the nutricline highlighted the coupling between physical fine-scale structures and nutrient dynamics, with further implications for un- derstanding nutrient supply and biogeochemical functioning in oligotrophic marine sys- tems. Information & Authors Information Version history Copyright This work is licensed under a Non Exclusive No Reuse License.

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Authors Metrics & Citations Metrics Article Usage 338views 246downloads Citations Download citation Aude Joel, Andrea Doglioli, Anthony Bosse, et al. Ocean Circulation Modulating the Nutricline at Regional and Fine scales: A Case Study in The Northwestern Mediterranean Sea. Authorea. 01 December 2025. DOI: https://doi.org/10.22541/au.176463275.55019718/v1 DOI: https://doi.org/10.22541/au.176463275.55019718/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu. Cited by - The North Balearic Front as an ecological boundary: zooplankton fine-scale distribution patterns in late spring, Biogeosciences, 23, 1, (363-385), (2026).https://doi.org/10.5194/bg-23-363-2026 Loading...

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