dos.step one. Research City
The NW Mediterranean is characterized by a good cyclonic flow creating an excellent gyre-such cellphone in the Ligurian Ocean (Millot, 1991, 1999; Millot and Taupier-Letage, 2005). The fresh new northern part of movement is created by North Latest (known as this new Liguro-Provencal-Catalan Most recent, and hereafter NC). The NC ‘s the go back department of one’s cyclonic flow one to moves along the Italian, French and you may Foreign language coasts, basically following the a lot of meters isobath (The fresh MerMex Class, 2011). Which permanent border newest belongs to the thermohaline stream off new Mediterranean and beyond and that is designed from the combining off two latest twigs moving toward both parties out-of Corsica (Profile step one). The fresh new key of the NC are healthier and you will located throughout the 10-forty kilometres away from the coastline inside cold weather, even though it is less discussed and additional overseas inside the late june and you may very early fall (Birol ainsi que al., 2010; Piterbarg ainsi que al., 2014; ).
Shape step one. Map of your own studies area. Upper Northwestern Mediterranean and beyond and you will a drawing 
of Northern Current plus the West and you may East Corsica Currents (WCC and you will ECC, respectively). Straight down Zoom on investigation part. Fall (28-) and you will june () glider tunes is plotted inside Magenta, Eco-friendly and Cyan, correspondingly. New red-colored-dashed line is the
one hundred kilometer straight line anywhere between 43°forty,000? N, 7°19,842? Age (up to the newest shelf crack at the five-hundred yards isobath) and you may 43°6,000? Letter, 8°20,000? E, on what glider casts try estimated having Figures 6–8. DYFAMED oceanographic channel are understood that have a reddish celebrity. Latest arrows regarding Aviso altimetric unit with the is plotted getting resource. The brand new altimeter situations was basically created by Ssalto/Duacs and you can provided by Aviso, with help of Cnes (
This study is targeted on the good-Calvi transect range (Profile step one, bottom panel). That it line are on a regular basis tracked as part of the Mediterranean Ocean Watching Program into the Environment (MOOSE), a multi-measure and you will multi-website observation system centering on coastal/unlock sea and you can sea/conditions connections. Included in MOOSE, monthly and you can yearly motorboat-situated observations are formulated collectively which transect. The fresh transect is additionally on a regular basis occupied because of the glider since 2007, for the purpose of creating it an emergency line. Discovered over the transect regarding 53 kilometres overseas regarding Sweet, the latest DYFAMED oceanographic route (red star to your Profile 1) is additionally perhaps one of the most analyzed station of basin (). The favorable spatio-temporary visibility of your city makes it the best place for the first in situ application of brand new MiniFluo to your glider.
The yearly years of your own biogeochemical program performing at DYFAMED may end up being described into the around three line of symptoms: winter season, springtime and you may summer/fall (Avril, 2002; Migon mais aussi al., 2002). The winter period try reigned over from the deep convection while the drinking water line is well-mixed. It’s followed by brand new springtime grow (March/April) happening following the onset of stratification. Other year, brand new NW Mediterranean exhibits a deep Chlorophyll Limit (DCM) during the mean breadth ranging from forty and you will sixty m one to lasts until being destroyed because of the after the wintertime convection (Lavigne et al., 2015). Limitation stratification is achieved after june/early slide, and corresponds to a time when DOM can add up from the skin waters (Jones et al., 2013). Smaller phytoplankton plants can also occur in the brand new fall.
2.2. MiniFluo Detector
Brand new sensor presented we have found a different sort of sort of the MiniFluo, an area-portable fluorometer introduced by Tedetti mais aussi al. (2013), which is today glider-compatible. First working principles is actually recalled lower than.
dos.dos.step 1. Fluorescence Concept
Fluorescence is initiated when a fluorescent compound (or fluorophore) absorbs a photon at a specific wavelength. The fluorophore then moves from its electronic ground state to an excited state. Because the excited state is unstable, the molecule rapidly returns to the ground state by transmitting a photon of longer wavelength (i.e., of lower energy) than the excitation photon. Each fluorophore can be thus targeted by specific excitation (?Ex boyfriend) and emission (?Em) wavelengths (with ?Ex 6 . The third parameter is the acquisition time (DACQ), expressed in ms. It corresponds to the time during which the LED is on and the photodiode collects the photons emitted by the compound. The higher the DACQ, the more the photodiode records fluorescence signal. For the mode LED ON?LED OFF, the measurement time is twice DACQ. The last parameter is the sampling interval (D2ACQ), which corresponds to the time (in ms) between two measurements, which determines the sampling frequency. For this study, the parameters used were: LED mode ON – OFF, caliber C0, DACQ = 600 ms and D2ACQ = 4,000 ms (about 0.2 Hz sampling frequency). Output from the MiniFluo to the glider includes raw fluorescence and monitoring values (raw binary counts) from both channels, as well as the emission/detection temperature values.
