Cited by 63Oceanographic and Atmospheric ProcessesMarine and coastal ecosystemsMarine and fisheries research

On the role of the mesoscale circulation on an idealized coastal upwelling ecosystem

Open access
Lathuilière, C., Echevin, V., Lévy, M., Madec, G.·2010·Journal of Geophysical Research: Oceans

Abstract

An idealized circulation model of coastal upwelling coupled to an ecosystem model has been built to address the impact of features such as eddies and filaments emerging from mesoscale dynamics on a marine ecosystem. The model mimics coastal upwelling along an infinite straight coast with north–south cyclic boundary conditions. Thanks to the parametrization of the geostrophic onshore flow in the thermocline, the circulation captures the typical characteristics of a coastal upwelling region: an equatorward coastal jet, a poleward undercurrent along the continental slope and mesoscale eddies and filaments. This eddying three‐dimensional simulation is compared to a two‐dimensional simulation using the averaged velocity field of the first simulation as velocity field. This approach allows us to compare simulations having similar upwelling and nutrient input but differing in the nature of the flow. An offshore spreading of the phytoplankton bloom is found in the eddying simulation. The width of the productive coastal band is increased from 80 km to 200 km by the mesoscale activity. A biogeochemical budget carried out in a 300 km‐wide coastal band provides evidence that mesoscale activity decreases the total phytoplankton content mainly by exporting a significant part of the surface phytoplankton below the euphotic layer. In presence of mesoscale activity, the downward and offshore export of phytoplankton, zooplankton and detritus significantly contributes to total export of organic matter out of the surface coastal ocean, whereas their contribution to export is weak in the two‐dimensional case.

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Registry

Crossref · 10.1029/2009jc005827

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  • (Sub)mesoscale turbulence modulates offshore transport and hence the net upwelling rate.

    “But (sub)mesoscale turbulence modulates offshore transport, hence the net upwelling rate.”

    From Competition between Baroclinic Instability and Ekman Transport under Varying Buoyancy Forcings in Upwelling Systems: An Idealized Analog to the Southern Ocean (2021) · cites this paper as Lathuilière et al. 2010

    The Summary (§5, paragraph 51; page unavailable) says mesoscale filaments export nitrate and phytoplankton offshore, supporting the transport part. But it also says the eddying and non-eddying simulations have the same upwelling mass flux, so the paper does not support the claimed change in net upwelling rate. (LLM, conf=0.91)

    Experimental — accuracy not yet measured
  • Quasi-balanced mesoscale and submesoscale turbulence is responsible for rectified eddy transport which also tends to counteract the Ekman upwelling cell.

    “quasi-balanced mesoscale and submesoscale turbulence is responsible for rectified eddy transport which also tends to counteract the Ekman upwelling cell.”

    From Competition between Baroclinic Instability and Ekman Transport under Varying Buoyancy Forcings in Upwelling Systems: An Idealized Analog to the Southern Ocean (2021) · cites this paper as Lathuilière et al. 2010

    The Summary (§5; page unavailable) reports that mesoscale circulation and filaments transport nitrate and phytoplankton offshore. But the Discussion (§4; page unavailable) explicitly says that rectification of the mean flow by mesoscale dynamics was not addressed. The paper does not establish that eddy transport counteracts the Ekman upwelling cell; its Physical Model (§2.1; page unavailable) attributes compensating onshore transport to an imposed alongshore pressure gradient. (LLM, conf=0.84)

    Experimental — accuracy not yet measured

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Cites

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Research works printed but not linked: 3

  1. Barton, E. D. (1998), Eastern boundary of the North Atlantic: Northwest Africa and Iberia, in The Sea, vol. 11, edited by A. R. Robinson and K. H. Brink, pp. 633-657, John Wiley, New York.
  2. Blanke, B., and P. Delecluse (1993), Variability of the tropical Atlantic Ocean simulated by a general circulation model with two different mixed-layer physics, J. Phys. Oceanogr., 23, 1363-1388, doi:10.1175/ 1520-0485. · DOI
  3. Pacanowski, R. C., and A. Gnanadesikan (1998), Transient response in a Z-level ocean model that resolves topography with partial cells, Mon. Weather Rev., 126(12), 3248-3270.

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Authors
Lathuilière, C., Echevin, V., Lévy, M., & Madec, G.
Affiliations
  • Centre National de la Recherche Scientifique (FR)
  • LOCEAN, Institut Pierre‐Simon Laplace Université Pierre et Marie Curie, CNRS, IRD, MNHN Paris France
Venue
Journal of Geophysical Research: Oceans
Published
2010-09
Volume
115
Issue
C9
Pages
09018
ISSN
0148-0227 (ISSN-L)
OpenAlex
W1969001328
Cited by
63
References
40
Citations by year
2026: 1 · 2025: 1 · 2024: 5 · 2023: 5 · 2022: 2 · 2021: 6 · 2020: 3 · 2019: 1 · 2018: 5 · 2017: 4 · 2016: 10 · 2015: 7 · 2014: 2 · 2013: 3 · 2012: 4
FWCI
2.58
Type
journal article
Language
en
Open access
Locations
  • Journal of Geophysical Research Atmospheres (publishedVersion)
  • HAL (submittedVersion, other-oa)
  • ePrints Soton (University of Southampton) (submittedVersion)
  • NERC Open Research Archive (Natural Environment Research Council) (submittedVersion)
Funders
Natural Environment Research Council (noc010010, noc010005)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Oceanographic and Atmospheric Processes
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
  • Physical Sciences › Environmental Science › Global and Planetary Change › Marine and fisheries research
Keywords
coastal upwelling, mesoscale eddies, filaments, phytoplankton blooms, thermocline, coastal jet, undercurrent, euphotic layer, ecosystem modeling

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