A review of the LATEX project: mesoscale to submesoscale processes in a coastal environment

Petrenko, Anne; Doglioli, Andrea M.; Nencioli, Francesco; Kersalé, Marion; Hu, Zheng; d’Ovidio, Francesco

doi:10.1007/s10236-017-1040-9

Cited by 37 publications

(37 citation statements)

References 108 publications

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“…New high-resolution satellite observing capabilities showed that very sharp SST gradients, with a few • C contrast over kilometre-scale ranges or less are probably as ubiquitous as oceanic sub-mesoscale processes both in the open ocean and in coastal waters. They can be generated by baroclinic instabilities on the edge of large-scale currents like the Gulf Stream (Gula et al, 2014) or the Agulhas (Krug et al, 2017), by flow instabilities along the continental slope or on the shelf (Petrenko et al, 2017;Rascle et al, 2017) or by local atmospheric forcing like upwelling systems (Meunier et al, 2012). These processes can be reproduced by oceanic numerical simulations and show typical life spans from 10 h to a few days (Capet et al, 2008;Gula et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

Impact of a sharp, small‐scale SST front on the marine atmospheric boundary layer on the Iroise Sea: Analysis from a hectometric simulation

Redelsperger

Bouin

Pianezze

et al. 2019

Quart J Royal Meteoro Soc

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The impact of a sharp, small‐scale sea‐surface temperature (SST) front located in the Iroise Sea off the northwestern coast of France on the marine atmospheric boundary layer (MABL) is investigated using a realistic very high‐resolution numerical simulation. The modelling configuration is based on a two‐way nesting of the atmospheric model Meso‐NH over three embedded domains, with horizontal resolution of 100 m in the central domain. The outer mesoscale domain is initialized and forced on its lateral boundaries with the operational analyses of Météo‐France. A high‐resolution, realistic SST field from the Model for Application at Regional Scale (MARS) 3D is used as surface forcing. This configuration has been carefully designed to accurately represent this weak‐wind situation highly inhomogeneous in space and time, with wind flowing from the warm to the cold side of the front. The impacts include a slight modification of the thermal structure of the MABL, and a strong and rapid decrease of the wind speed, wind stress and turbulent heat fluxes. Conversely to previously published work, the coupling of the wind stress with the SST is largely related to atmospheric stability effects rather than to the change of the surface wind speed. This is attributed to the conjunction of the weak wind speed around 3 m s−1 and of the narrowness of the front resulting in relatively strong advection. These characteristics explain the momentum budget with strong change of the turbulent mixing over a shorter length‐scale than the pressure adjustment mechanism and the Coriolis term. The deceleration and counter‐clockwise veering of the near‐surface wind over colder water is consistent with previous work. Its attribution to turbulent mixing via a thermal stratification change in the context of a realistic study of a sharp front is a novel result.

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Section: Resultsmentioning

confidence: 99%

Impact of a sharp, small‐scale SST front on the marine atmospheric boundary layer on the Iroise Sea: Analysis from a hectometric simulation

Redelsperger

Bouin

Pianezze

et al. 2019

Quart J Royal Meteoro Soc

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“…Several satellite datasets were exploited during the campaign to guide the cruise through an adaptive sampling strategy using the SPASSO software package (http://www.mio.univ-amu.fr/SPASSO/) following the same approach of previous cruises such as LATEX (Doglioli, 2013;Petrenko et al, 2017) and KEOPS2 (d 'Ovidio et al, 2015). SPASSO was also used after the cruise in order to extend the spatial and temporal vision of the in situ observations.…”

Section: Satellite Datamentioning

confidence: 99%

Large to submesoscale surface circulation and its implications on biogeochemical/biological horizontal distributions during the OUTPACE cruise (SouthWest Pacific)

Rousselet¹,

Verneil²,

Doglioli³

et al. 2017

Preprint

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Abstract. The patterns of the large-scale, meso-and submesoscale surface circulation on biogeochemical and biological distributions are examined in the Western Tropical South Pacific (WTSP) in the context of the OUTPACE cruise (Feb-April 2015).Multi-disciplinary original in situ observations were achieved along a zonal transect through the WTSP and their analysis was coupled with satellite data. The use of Lagrangian diagnostics allows for the identification of water mass pathways, mesoscale structures, and submesoscale features such as fronts. In particular, we confirmed the existence of a global wind-driven south- related with 25% of surface tracer gradients which reveals the significance of such structures in the generation of submesoscale surface gradients. Additionally, two high-frequency sampling transects of biogeochemical parameters and micro-organism abundances demonstrate the influence of fronts in controlling the spatial distribution of bacteria and phytoplankton, and as a consequence the microbial community structure. All circulation scales play an important role that has to be taken into account when analysing the data from OUTPACE but also, more generally, to understand the global distribution of biogeochemical 15 components.

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“…To locate these three stations, we used a Lagrangian strategy developed during previous cruises such as LATEX (Doglioli et al, 2013;Petrenko et al, 2017) andKEOPS2 (d'Ovidio et al, 2015). Briefly, the regions of interest along the vessel route were first characterized at large scale through the analysis of satellite data.…”

Section: Station Sampling Strategymentioning

confidence: 99%

N<sub>2</sub> fixation as a dominant new N source in the western tropical South Pacific Ocean (OUTPACE cruise)

et al. 2018

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Abstract. We performed nitrogen (N) budgets in the photic layer of three contrasting stations representing different trophic conditions in the western tropical South Pacific (WTSP) Ocean during austral summer conditions (FebruaryMarch 2015). Using a Lagrangian strategy, we sampled the same water mass for the entire duration of each long-duration (5 days) station, allowing us to consider only vertical exchanges for the budgets. We quantified all major vertical N fluxes both entering (N 2 fixation, nitrate turbulent diffusion, atmospheric deposition) and leaving the photic layer (particulate N export). The three stations were characterized by a strong nitracline and contrasted deep chlorophyll maximum depths, which were lower in the oligotrophic Melanesian archipelago (MA, stations LD A and LD B) than in the ultra-oligotrophic waters of the South Pacific Gyre (SPG, station LD C). N 2 fixation rates were extremely high at both LD A (593 ± 51 µmol N m −2 d −1 ) and LD B (706 ± 302 µmol N m −2 d −1 ), and the diazotroph community was dominated by Trichodesmium. N 2 fixation rates were lower (59 ± 16 µmol N m −2 d −1 ) at LD C, and the diazotroph community was dominated by unicellular N 2 -fixing cyanobacteria (UCYN). At all stations, N 2 fixation was the major source of new N (> 90 %) before atmospheric deposition and upward nitrate fluxes induced by turbulence. N 2 fixation contributed circa 13-18 % of primary production in the MA region and 3 % in the SPG water and sustained nearly all new primary production at all stations. The e ratio (e ratio = particulate carbon export / primary production) was maximum at LD A (9.7 %) and was higher than the e ratio in most studied oligotrophic regions (< 5 %), indicating a high efficiency of the WTSP to export carbon relative to primary production. The direct export of diazotrophs assessed by qPCR of the nifH gene in sediment traps represented up to 30.6 % of the PC export at LD A, while their contribution was 5 and < 0.1 % at LD B and LD C, respectively. At the three studied stations, the sum of all N input to the photic layer exceeded the N output through organic matter export. This disequilibrium leading to N accumulation in the upper Published by Copernicus Publications on behalf of the European Geosciences Union.

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A review of the LATEX project: mesoscale to submesoscale processes in a coastal environment

Abstract: The main objective of the LAgrangian Transport EXperiment (LA-

Cited by 37 publications

References 108 publications

Impact of a sharp, small‐scale SST front on the marine atmospheric boundary layer on the Iroise Sea: Analysis from a hectometric simulation

Impact of a sharp, small‐scale SST front on the marine atmospheric boundary layer on the Iroise Sea: Analysis from a hectometric simulation

Large to submesoscale surface circulation and its implications on biogeochemical/biological horizontal distributions during the OUTPACE cruise (SouthWest Pacific)

N<sub>2</sub> fixation as a dominant new N source in the western tropical South Pacific Ocean (OUTPACE cruise)

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A review of the LATEX project: mesoscale to submesoscale processes in a coastal environment

Abstract: The main objective of the LAgrangian Transport EXperiment (LA-

Cited by 37 publications

References 108 publications

Impact of a sharp, small‐scale SST front on the marine atmospheric boundary layer on the Iroise Sea: Analysis from a hectometric simulation

Impact of a sharp, small‐scale SST front on the marine atmospheric boundary layer on the Iroise Sea: Analysis from a hectometric simulation

Large to submesoscale surface circulation and its implications on biogeochemical/biological horizontal distributions during the OUTPACE cruise (SouthWest Pacific)

N&lt;sub&gt;2&lt;/sub&gt; fixation as a dominant new N source in the western tropical South Pacific Ocean (OUTPACE cruise)

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N<sub>2</sub> fixation as a dominant new N source in the western tropical South Pacific Ocean (OUTPACE cruise)