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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): L. Rousselet, S. Barrillon, A. Petrenko, A.Doglioli (on board) \\% and F. d'Ovidio
\vspace{1.5cm}
%\vspace{0.3cm} Author(s): S. Barrillon,  A. Petrenko, A.Doglioli % (on board), L. Rousselet \\% and F. d'Ovidio
\vspace{1.5cm}
\noindent\makebox[\linewidth]{\rule{\textwidth}{2pt}}
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{\bf Executive Summary}\\%.\\
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The general strategy determined on yesterday's bulletin is confirmed.
The cruise is scheduled to start on April 30, 2018. The sampling should be performed in the area between 2\degE-4\degE and 38.2\degN-39.2\degN (exact location still to be determined after a large survey with Seasoar and BB). The BeautempsBeaupre (BB) could perform a Lagrangian sampling whereas at the same time the Garcia del Cid could achieved an Eulerian CTD sampling on a regular grid.\\
%
The Chl images are still cloudy today but should be clear tomorrow.\\
\\
We would recommend two interesting sampling areas:\\
 - the east-west zonal shear with the OW structure located south between Ibiza and Majorqua (38-39\degN and 1.9-3\degE).\\
 - The FSLE structure inside the eastern SWOT track between (3\degE-4\degE,39\degN-38.5\degN).
%\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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\begin{center}
%\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=0.65]{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}
 
The beginning of the cruise is scheduled for April 30, 2018. A first survey should be performed in the area between 2\degE-4\degE and 38.2\degN-39.2\degN with the Seasor in order to determine the exact location of the cruise sampling. On May 5th, the Garcia del Cid (GC) should arrive in the fixed sampling area and should start CTD sampling (casts down to \~800~m) on a 10~km regular grid (Eulerian sampling strategy). At the same time the BB could perform a Lagrangian sampling in a smaller area. Drifters deployment could be realized during this Lagrangian sampling. 

\section{Daily figures analysis}

\subsection{Altimetry, derived currents and Lagrangian analysis}


\begin{center}
\includegraphics[scale=0.65]{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.

\begin{center}
\includegraphics[scale=0.65]{figures/AVISO_vel.png}\\
\vspace{0.5cm}
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The area between 2-4\degE and 38.2-39.2\degN has very low kinetic energy.


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\includegraphics[scale=0.65]{figures/FSLE.png}\\
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Both interesting FSLE are still there:\\
- Southwest of Majorqua in an oblique direction SW-NE (38 and 39\degN and between 2 and 3\degE)\\
- Inside the eastern SWOT track (3\degE-4\degE,39\degN-38.5\degN)
%Southwest of Majorqua, the interesting FSLE structure stretching in an oblique direction SW-NE (38 and 39\degN and between 2 and 3\degE) mentioned in the last bulletin is still there.\\
%Another FSLE structure extending southeast is detected inside the eastern SWOT track (3\degE-4\degE,39\degN-38.5\degN). 
%The chlorophyll center mentioned above is located east of this FSLE structure with a filament stretching southwest.


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\includegraphics[scale=0.65]{figures/OW_param.png}\\
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A mesoscale structure seems to form just north of the FSLE feature (between Ibiza and Majorqua).

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

\newpage
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\includegraphics[scale=0.65]{figures/Lat_adv.png}\\
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\includegraphics[scale=0.65]{figures/Lon_adv.png}\\
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\end{center}

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.
The waters south of the FSLE structure are coming from East.

The second area showing an interesting FSLE feature is quite stable.
%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=0.65]{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.
\begin{center}
%\includegraphics[scale=0.75]{figures/JPL_OUROCEAN-L4UHfnd-GLOB-v01-fv01_0-G1SST.png}
\includegraphics[scale=0.65]{figures/GOS-L4_GHRSST-SSTfnd-OISST_UHR_NRT-MED-v02_0-fv_mat.png}\\
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The SWOT sampling area is relatively cold. 
%The scale has been changed to [14;18]\degree to adjust to the current warming of the area.
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\subsection{Chlorophyll analysis}
\begin{center}
\includegraphics[scale=0.65]{figures/nrt_color_swmed.png}\\
\vspace{0.5cm}
\end{center}

%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=0.65]
{figures/d-OC_CNR-L3-CHL-MedOC4AD4_MULTI_1KM-MED-NRT_mat.png}\\
\vspace{0.5cm}
\end{center}

\begin{center}
\includegraphics[scale=0.65]
{figures/d-ACRI-L3-CHL-GSM_MULTI_4KM-GLO-NRT_mat.png}\\
\vspace{0.5cm}
\end{center}

Most of the Chl figures are still cloudy in the region of interest. One of the figures show very low concentration of Chl in the SWOT sampling area. The last clear Chl figure is from the $23^{rd}$ of April (shown below) and show some Chl diffuse activity in the area 38.5 and 39\degN and between 3 and 4.5\degE.

\begin{center}
\includegraphics[scale=0.65]
{figures/nrt_color_swmed_20180422_20180424.png}\\
\vspace{0.5cm}
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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
%\newpage
\begin{center}
.\\
 {\bf Acknowledgements}\\
 \end{center}
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.\\

% %\newpage




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{\huge 
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PREBIOSWOT project webpages\\
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(\`a d\'efinir)\\
\vspace{4cm}
SPASSO PREBIOSWOT webpages}\\
\vspace{1cm}
http://www.mio.univ-amu.fr/SPASSO/PREBIOSWOT/

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