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\huge {PREBIOSWOT cruise}
\\ \vspace{0.3cm} \Huge {\bf SPASSO Images Analysis}
\\ \vspace{0.3cm} \Large \ddmmyyyydate\today ~ \currenttime {\large~UTC}
\\ \vspace{0.3cm} Author(s): A. Petrenko, S. Barrillon, A.Doglioli, %(on board),  L. Rousselet \\% and F. d'Ovidio
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%\vspace{0.3cm} Author(s): S. Barrillon,  A. Petrenko, A.Doglioli % (on board), L. Rousselet \\% and F. d'Ovidio
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\noindent\makebox[\linewidth]{\rule{\textwidth}{2pt}}
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{\bf Executive Summary}\\%.\\
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This is the 5$^{th}$ bulletin test before the cruise starts.\\
Franck Dumas has boarded on the RV Beautemps Beaupre in Brest on April 18, heading to the study zone.
The cruise preparation meeting is scheduled on board on April 27.
The cruise is scheduled to start on April 30, 2018.\\
%
\noindent A meteorological anticyclone has settled in the area of study hence the Chlorophyll and Temperature maps in the CLS products should be really nice for the cruise.

Following the chlorophyll image, we would recommend staying in the area between 38 and 39\degN and between 2.8 and 3.6\degE; which should correspond to a nice filament.  
%Over this area, the Lon\_adv shows a east-west zonal shear with the Northern part coming from the North (see Lat\_adv).

%\noindent The structure at 4\degE 38.5\degN has evolved to small filaments and is disappearing. 
%Following it will allow to monitor the end of the bloom.
%A combined analysis of all the data suggests a possible coastal water upwelling, advected southward, around 4\degE 39\degN in the Eastern SWOT track. 
%An anticyclonic eddy is appearing SW associated with a local Chl increase.



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%\includegraphics[scale=0.75]{figures/d-OC_CNR-L3-CHL-MedOC4AD4_MULTI_1KM-MED-NRT-v02.png}\\
%\includegraphics[scale=0.75]{figures/nrt_med_allsat_phy_l4.png}\\
%\includegraphics[scale=0.75]{figures/AVISO_vel.png}\\
%\includegraphics[scale=0.75]{figures/FSLE.png}\\
%\includegraphics[scale=0.75]{figures/OW_param.png}\\
%\includegraphics[scale=0.75]{figures/Lat_adv.png}\\
%\includegraphics[scale=0.75]{figures/Lon_adv.png}\\
%\includegraphics[scale=0.75]{figures/nrt_temperature_swmed.png}\\
\includegraphics[scale=0.75]{figures/nrt_color_swmed.png}\\
%\includegraphics[scale=0.75] {figures/d-OC_CNR-L3-CHL-MedOC4AD4_MULTI_1KM-MED-NRT-v02.png}\\

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\section{Ongoing operations and upcoming stations}

This is the fifth bulletin test before the cruise starts. 
The beginning of the cruise is scheduled for April 30, 2018.


\section{Daily figures analysis}

\subsection{Altimetry, derived currents and Lagrangian analysis}


\begin{center}
\includegraphics[scale=0.75]{figures/nrt_med_allsat_phy_l4.png}\\
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The SWOT area is very calm.
%An anticyclonic eddy is appearing SW (0.5\degE 37.5\degN).
%Around 4\degE 39\degN, a southward current is present.

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\includegraphics[scale=0.75]{figures/AVISO_vel.png}\\
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A high velocity structure is located East of the SWOT transect.


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\includegraphics[scale=0.75]{figures/FSLE.png}\\
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Southwest of Majorqua, an interesting FSLE structure stretches in an oblique direction SW-NE (38 and 39\degN and between 2 and 3\degE).
The chlorophyll center mentioned above is located east of this FSLE structure with a filament stretching southwest.


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\includegraphics[scale=0.75]{figures/OW_param.png}\\
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The OW figure shows weak activity in the SWOT area.

%the anticyclonic eddy at 0.5\degE 37.5\degN.


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\includegraphics[scale=0.75]{figures/Lat_adv.png}\\
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\includegraphics[scale=0.75]{figures/Lon_adv.png}\\
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The Lat\_adv and Lon\_adv images agree with the FSLE structure. 
These images show that the waters north of the FSLE structure seem to have coastal origins, originating either from Majorqua or Ibiza, potentially leading to interesting enrichment with maybe biogeochemical and biological implications.

Hence all the figures are going in the same direction, leading to the recommended area: 38 and 39\degN and between 2.8 and 3.6\degE.
%The Longitude and Latitude advection figures have been modified in order to plot the difference between now and 15 days ago. 
%These figures show both the advection towards N close to the SE local energy maximum and the trapping associated to the SW eddy.
%A southward advection can be seen around 4\degE 39\degN associated with the above cited current.


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\subsection{SST analysis}
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\includegraphics[scale=0.75]{figures/nrt_temperature_swmed.png}\\
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%Around 4\degE 39\degN, the SST is slightly lower than the surrounding waters, which could be explained as a possible coastal water upwelling, advected by the above cited current.
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%\includegraphics[scale=0.75]{figures/JPL_OUROCEAN-L4UHfnd-GLOB-v01-fv01_0-G1SST.png}
\includegraphics[scale=0.75]{figures/GOS-L4_GHRSST-SSTfnd-OISST_UHR_NRT-MED-v02_0-fv_mat.png}\\
The Southern part is warmer than the Northern one. 
The scale is going to be changed to adjust to the current warming of the area in order to improve contrast and better distinguish features.
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\subsection{Chlorophyll analysis}
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\includegraphics[scale=0.75]{figures/nrt_color_swmed.png}\\
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%The anticyclonic eddy which had appeared SW (see last bulletin) is still associated with a local Chl increase.
%This eddy seems to stay at the same spot, potentially stopped there in its eastward translation by currents coming from the northeast.


\begin{center}
\includegraphics[scale=0.75]
{figures/d-OC_CNR-L3-CHL-MedOC4AD4_MULTI_1KM-MED-NRT_mat.png}\\
\vspace{0.5cm}
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\begin{center}
\includegraphics[scale=0.75]
{figures/d-ACRI-L3-CHL-GSM_MULTI_4KM-GLO-NRT_mat.png}\\
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%The CLS image show a local maximum around 4\degE 39\degN, compatible with the coastal water upwelling hypothesis.
%Meanwhile, the structure discussed in the previous bulletin at 4\degE 38.5\degN has evolved to small filaments and is disappearing in the CMEMS data figure. 
%Following it will allow to monitor the end of the bloom.
%(Note: the CMEMS data figure is showing more recent data.)
\clearpage
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\begin{center}
.\\
 {\bf Acknowledgements}\\
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The altimetry data are the AVISO Mediterranean regional product:\\ http://www.aviso.altimetry.fr/index.php?id=1275.\\ The derived currents are processed by SPASSO to derive Eulerian and Lagrangian diagnostics of ocean circulation: Okubo$\-$Weiss parameter, particle retention time and advection, Lagrangian Coherent Structures.
CLS provided the SST and surface CHL concentration composite products. 
Sea surface temperature (level 3 and 4, 1 km resolution) and chlorophyll concentration (level 3, 1km resolution, MODIS$\-$Aqua and NPP$\-$VIIRS sensors combined (after May 27, 2017) into a new product called MULTI) have been provided by CMEMS$\-$ Copernicus Marine Environment Monitoring Service (http://marine.copernicus.eu).
Another SST product (level 4, composite, 1 km resolution) is provided by the Jet Propulsion Laboratory (JPL), Pasadena, CA.

% %MyOcean­L3/daily­NRT­1x1km data for the study area from 2013 to 2015 were analyzed.

% % AVISO, CMEMS, JPL (cruise report oscahr)
% %C.Yohia, D.Mallarino and M.Libes (Informatic Service of OSU Pytheas, Marseille, France) for their support in managing the SPASSO software package and the associated web sites; N.Martin (LOCEAN, Paris, France) for his precious help in treatment of the Lagrangian drifters data; C.Maes (LPO, Brest, France) and F.d'Ovidio (LOCEAN, Paris, France) for their useful suggestions.\\

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{\huge 
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PREBIOSWOT project webpages\\
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(\`a d\'efinir)\\
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SPASSO PREBIOSWOT webpages}\\
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http://www.mio.univ-amu.fr/SPASSO/PREBIOSWOT/

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