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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): A. Petrenko, L. Rousselet, S. Barrillon, A.Doglioli (on board) \\% and F. d'Ovidio
\vspace{1.cm}
%\vspace{0.3cm} Author(s): S. Barrillon,  A. Petrenko, A.Doglioli % (on board), L. Rousselet \\% and F. d'Ovidio
%\vspace{1.cm}
\vspace{1.5cm}
\noindent\makebox[\linewidth]{\rule{\textwidth}{2pt}}
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{\bf Executive Summary}\\%.\\
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Since the Chl images are more cloudy than yesterday and there are relatively stronger currents on the western track, we are going back to advise either one of the two zones as two days ago:\\
a) Southwest of Majorqua (38 and 39\degN and between 2 and 3\degE),\\
b) Inside the eastern SWOT track (3\degE-4.5\degE,38\degN-39.5\degN).\\

\noindent
The BB sampling should be performed in the area between 2\degE-4\degE and 38.2\degN-39.2\degN (the exact location is still to be determined after a large survey with the Seasoar). 
The BB will perform a Lagrangian sampling whereas, starting May 5, the Garcia del Cid will achieve a Eulerian CTD sampling on a regular grid.\\
%

%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=0.65]{figures/Lat_adv.png}\\
\includegraphics[scale=0.65]{figures/Lon_adv.png}\\
%\includegraphics[scale=0.75]{figures/nrt_temperature_swmed.png}\\
%\includegraphics[scale=0.65]{figures/nrt_color_swmed.png}\\
%\includegraphics[scale=0.75] {figures/d-OC_CNR-L3-CHL-MedOC4AD4_MULTI_1KM-MED-NRT-v02.png}\\

\vspace{0.5cm}
\end{center}


\newpage
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\section{Ongoing operations and upcoming stations}
 
The cruise has started. 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 a CTD sampling (with casts down to \~800~m) on a 10~km regular grid (Eulerian sampling strategy). At the same time the BB would 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}\\
\vspace{0.5cm}
\end{center}

The SWOT area is relatively calm, with stronger currents on the western track north of 38\degN.
%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}
\end{center}

The area between 2-4\degE and 38.2-39.2\degN has very low kinetic energy, with slightly stronger energy on the western track than on the eastern track.


\begin{center}
\includegraphics[scale=0.65]{figures/FSLE.png}\\
\vspace{0.5cm}
\end{center}
Both interesting FSLE are still there:\\
a) Southwest of Majorqua (38 and 39\degN and between 2 and 3\degE)\\
b) Inside the eastern SWOT track (3\degE-4.5\degE,38\degN-39.5\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.


\begin{center}
\includegraphics[scale=0.65]{figures/OW_param.png}\\
\vspace{0.5cm}
\end{center}

The mesoscale structure mentioned in the last three bulletins (just north of the FSLE feature located between Ibiza and Majorqua)  seems to maintain its distorted shape.
%We do not see the eddy mentioned by Francesco and detected in the Sentinel 1 SAR product, centered about 4.02667 \degE- 37.98664\degN.

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

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

\begin{center}
\includegraphics[scale=0.65]{figures/Lon_adv.png}\\
\vspace{0.5cm}
\end{center}

The Lat\_adv and Lon\_adv images agree with the FSLE structures. 
These images show that the waters north of the FSLE structure a) seem to have coastal origins, originating either from Majorqua or Ibiza, potentially leading to interesting enrichment with maybe biogeochemical and biological implications. On the Lon\_adv figure, these coastal waters are either grey or yellowish green. On the Lat\_adv figure, these coastal waters are either grey or greenish. The waters south of this FSLE structure are coming from the East and they are blueish in the Lon\_adv.
%Nonetheless the chlorophyll data are quite low in the area (see below).

%The second area b) showing an interesting FSLE feature exhibits higher chlorophyll content (see below).

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\subsection{SST analysis}
\begin{center}
\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 has colder temperature than east of the tracks. 
%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}

The Chl figures are cloudy.
%is very nice. It exhibits higher chlorophyll content on the eastern track; hence the above recommendation of choosing this FSLE feature (the b), rather than the western FSLE (the a).

The last clear Chl figure is from yesterday, April 30 (shown below) and show some Chl on the eastern track.

\begin{center}
\includegraphics[scale=0.65]
{figures/nrt_color_swmed_20180427_20180429.png}\\
\vspace{0.5cm}
\end{center}



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

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