Preprints
https://doi.org/10.5194/bg-2020-481
https://doi.org/10.5194/bg-2020-481

  25 Jan 2021

25 Jan 2021

Review status: a revised version of this preprint is currently under review for the journal BG.

Long distance particle transport to the central Ionian Sea

Léo Berline1, Andrea Michelangelo Doglioli1, Anne Petrenko1, Stéphanie Barrillon1, Boris Espinasse2, Frederic A. C. Le Moigne1, François Simon-Bot1, Melilotus Thyssen1, and François Carlotti1 Léo Berline et al.
  • 1Aix Marseille Université, Université de Toulon, CNRS, IRD, Mediterranean Institute of Oceanography (MIO), 13288, Marseille, France
  • 2Department of Arctic and Marine Biology, UiT The Arctic University of Norway, Tromsø, Norway

Abstract. In the upper layers of the Ionian Sea, young Mediterranean Atlantic Waters (MAW) flowing eastward from the Sicily channel meet old MAW. In May 2017, during the PEACETIME cruise, fluorescence and particle content sampled at high resolution revealed unexpected heterogeneity in the central Ionian. Surface salinity measurements, together with altimetry-derived and hull-mounted ADCP currents, describe a zonal pathway of AW entering the Ionian Sea, consistent with the so-called cyclonic mode in the North Ionian Gyre. The ION-Tr transect, located ~19–20° E–~36° N turned out to be at the crossroad of three water masses, mostly coming from the west, north and from an isolated anticyclonic eddy northeast of ION-Tr. Using Lagrangian numerical simulations, we suggest that the contrast in particle loads along ION-Tr originates from particles transported from these three different water masses. Waters from the west, identified as young AW carried by a strong southwestward jet, were intermediate in particle load, probably originating from the Sicily channel. Water mass originating from the north was carrying abundant particles, probably originating from northern Ionian, or further from the south Adriatic. Waters from the eddy, depleted in particles and Chl-a may originate from south of Peloponnese, where the Pelops eddy forms.

The central Ionian Sea hence appears as a mosaic area, where waters of contrasted biological history meet. This contrast is particularly clear in spring, when blooming and non-blooming areas co-occur. Particle abundance in situ measurements are useful to discriminate water masses and derive circulation, together with T-S properties.

Interpreting the complex dynamics of physical-biogeochemical coupling from discrete measurements made at isolated stations at sea is a big challenge. The combination of multi-parametric in situ measurements at high resolution with remote sensing and Lagrangian modeling appears as one proper way to address this challenge.

Léo Berline et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on bg-2020-481', Anonymous Referee #1, 12 Feb 2021
    • AC1: 'Reply on RC1', Leo Berline, 11 May 2021
  • RC2: 'Comment on bg-2020-481', Anonymous Referee #2, 14 Feb 2021
    • AC2: 'Reply on RC2', Leo Berline, 11 May 2021

Léo Berline et al.

Léo Berline et al.

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Latest update: 16 May 2021
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Short summary
While Ionian Sea is considered as a nutrient depleted and low phytoplankton biomass area, it is a crossroad for water mass circulation. In the central Ionian Sea, we observed a strong contrast in particle distribution across a relatively short distance. Using remote sensing and Lagrangian simulations, we suggest that this contrast originate from long distance transport of particles from the north, west and east of Ionian Sea, where phytoplankton production was more intense.
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