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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. Petrenko, L. Rousselet, 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
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\vspace{0.5cm}
\noindent\makebox[\linewidth]{\rule{\textwidth}{2pt}}
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{\bf Executive Summary}\\%.\\
\end{center}

\noindent 
The strategy for the BB has been adapted. 3 different areas will be sampled starting today until Sunday (stars in the zoomed plots), with a back and forth strategy between the points.\\

\noindent The Lagrangian adaptative strategy is going to focus on an oblique NW-SE FSLE that will be crossed by the first transects between point A (about 3.4\degE - 38.5\degN) and B (about 3.9\degE - 38.7\degN) and crossed again by the following transects between A and C (about 3.2\degE 38.9\degN).\\

\noindent The CLS Chl figure is clearing up. It seems to show a nice contrast between A and C, although weaker than the last clear Chl figure.\\

% with the BB code color.
%The Chl images are still cloudy.\\
%\noindent  Note the MIO glider progressing southeastward.
%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).\\
%A rather weak FSLE can be seen in the middle of the operation zone, between 2.2\degE-3.6\degE and 38.2\degN-38.4\degN, probably interesting to cross. \\
%
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\noindent\makebox[\linewidth]{\rule{\textwidth}{2pt}}
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\begin{center}
\includegraphics[scale=0.43]{figures/map_FSLE_20180508_z.png}\\
%\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=0.8]{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=0.75]{figures/nrt_color_swmed.png}\\
%\includegraphics[scale=0.75] {figures/d-OC_CNR-L3-CHL-MedOC4AD4_MULTI_1KM-MED-NRT-v02.png}\\
\includegraphics[scale=0.43]{figures/map_CHL_nrt_color_swmed_20180506_20180508_z.png}
%\includegraphics[scale=0.43]{figures/map_AVISO_20180508_z.png}\\
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\newpage
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\section{Ongoing operations and upcoming stations}

The strategy for the BB has been adapted. 3 different areas will be sampled starting today until Sunday (stars in the zoomed plots), with a back and forth strategy between the points, and with the seasoar undulating first in the range 0-250m and then between 0-400m. The overlapping with the GdC area (between 2.5-3.5\degE and 38-39\degN) is improved and the 3 different areas cover quite well the satellite Chl patch observed in the last clear CHL figure by CLS.

\section{Daily figures analysis}

\subsection{Altimetry, derived currents and Lagrangian analysis}

\begin{center}
\includegraphics[scale=0.45]{figures/nrt_med_allsat_phy_l4.png}\\
%\vspace{0.5cm}
%We added the ship location planned for today until saturday. 
\includegraphics[scale=0.35]{figures/map_AVISO_20180508_z.png}\\
%\vspace{0.5cm}
\end{center}
The currents are relatively weak in the chosen area. Section AB crosses eastward currents. Nonetheless, in the previous cases when the BB crossed this FSLE, the AVISO currents were not in agreement with the ADCP currents. The ADCP currents were exhibiting currents to the Southeast about A, and towards the Northwest around B.\\
The anticyclonic structure mentioned in the lasts bulletins and centered at 5.5\degE - 38.4\degN is still visible.

%, apart at the NW end of the oblique FSLE (around 5.1\degE - 39.5\degN) and around the anticyclonic structure located at the southern part of the 5-7 May box (about 5.5\degE - 38.4\degN).
%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=0.63]{figures/AVISO_vel.png}\\
\vspace{0.5cm}
\end{center}

The area has low energy.

\newpage
\begin{center}
\includegraphics[scale=0.63]{figures/FSLE.png}\\
\includegraphics[scale=0.35]{figures/map_FSLE_20180508_z.png}\\
\vspace{0.5cm}
\end{center}

The Lagrangian adaptative strategy is going to focus on an oblique NW-SE FSLE that will be crossed by the first transects between point A (about 3.4\degE - 38.5\degN) and B (about 3.9\degE - 38.7\degN) and crossed again by the following transects between A and C (about 3.2\degE 38.9\degN).\\

% 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)

% A rather weak FSLE (c) can be seen in the middle of the operation zone, between 2.2\degE-3.6\degE and 38.2\degN-38.4\degN; it would probably be interesting to cross it. 
%Nonetheless, the planned zone is missing most of the a) FSLE, since this FSLE corresponds to the northern limit of the zone; and is catching only a part of the b) FSLE.
%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 distorted mesoscale structure mentioned in the last bulletins (located southeast of Ibiza and southwest of Majorqua) is still at the same spot. The BB may cross it on Sunday, as well as the smaller feature betweeen Ibiza and Majorqua.


%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}

\noindent The Lat\_adv and Lon\_adv images agree with the FSLE structures.\\
The FSLE structure that will be crossed by the BB transects seems to separate waters originating from the southeast on its south-west side (around A) and coastal waters on its north-east side (around B and C).

%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}\\
\vspace{0.5cm}
\end{center}
%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=0.65]{figures/GOS-L4_GHRSST-SSTfnd-OISST_UHR_NRT-MED-v02_0-fv_mat.png}\\
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Globally the area has warmed up. 
%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}\\
\includegraphics[scale=0.43]{figures/map_CHL_nrt_color_swmed_20180506_20180508_z.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}

% \noindent Note that the CNR\_L3\_CHL\_MedOC4AD4\_MULTI\_1KM\-MED (usually second figure in our bulletin) is cloud-covered and not shown.

%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).

\noindent The CLS Chl figure is clearing up. It seems to show a nice contrast between A and C, although weaker than the last clear Chl figure (shown below).

\begin{center}
\includegraphics[scale=0.65]{figures/nrt_color_swmed_20180502_20180504.png}\\
\includegraphics[scale=0.35]{figures/map_CHL_nrt_color_swmed_20180502_20180504_z.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.\\

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{\huge 
\vspace{4cm}
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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