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\begin{center}
\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): S. Barrillon, A.Doglioli, A. Petrenko %L. Rousselet \\% and F. d'Ovidio
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{\bf Executive Summary}\\%.\\
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This is the second bulletin test before the cruise starts. 
The beginning of the cruise is scheduled for April 28, 2018.\\

\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/20180405_d-OC_CNR-L3-CHL-MedOC4AD4_MULTI_1KM-MED-NRT-v02.png}\\
%\includegraphics[scale=0.75]{figures/nrt_med_allsat_phy_l4_20180405_20180405.png}\\
%\includegraphics[scale=0.75]{figures/AVISO_vel_20180405.png}\\
%\includegraphics[scale=0.75]{figures/FSLE_20180405.png}\\
%\includegraphics[scale=0.75]{figures/OW_param_20180405.png}\\
%\includegraphics[scale=0.75]{figures/Lat_adv_20180405.png}\\
%\includegraphics[scale=0.75]{figures/Lon_adv_20180405.png}\\
%\includegraphics[scale=0.75]{figures/nrt_temperature_swmed_20180403_20180405.png}\\
\includegraphics[scale=0.75]{figures/nrt_color_swmed_20180403_20180405.png}\\
%\includegraphics[scale=0.75] {figures/20180405_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 second bulletin test before the cruise starts. 
The beginning of the cruise is scheduled for April 28, 2018.


\section{Daily figures analysis}

\subsection{Altimetry, derived currents and Lagrangian analysis}


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\includegraphics[scale=0.75]{figures/nrt_med_allsat_phy_l4_20180405_20180405.png}\\
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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_20180405.png}\\
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A high velocity structure is located South-East of the SWOT transect.


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\includegraphics[scale=0.75]{figures/FSLE_20180405.png}\\
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\includegraphics[scale=0.75]{figures/OW_param_20180405.png}\\
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Both the FSLE and the OW figures show the anticyclonic eddy at 0.5\degE 37.5\degN.


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\includegraphics[scale=0.75]{figures/Lat_adv_20180405.png}\\
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\includegraphics[scale=0.75]{figures/Lon_adv_20180405.png}\\
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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_20180403_20180405.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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\subsection{Chlorophyll analysis}
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\includegraphics[scale=0.75]{figures/nrt_color_swmed_20180403_20180405.png}\\
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{figures/20180405_d-OC_CNR-L3-CHL-MedOC4AD4_MULTI_1KM-MED-NRT-v02.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.)
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.\\
 {\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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PREBIOSWOT project webpages\\
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(\`a d\'efinir)}
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