\documentclass[a4paper,11pt]{article}
\usepackage[T1]{fontenc}
%\usepackage[english,francais]{babel}
\usepackage{gensymb}
\usepackage{datetime}
\newcommand{\degE}{\degree$\!$E~}
\newcommand{\degW}{\degree$\!$W~}
\newcommand{\degS}{\degree$\!$S~}
\newcommand{\degN}{\degree$\!$N~}
\newcommand{\degC}{\degree$\!$C~}
\newcommand{\CHLunits}{~[mg~m$^{-3}$]}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


\usepackage{titlesec} \titleformat*{\section}{\Large\bfseries} \titleformat*{\subsection}{\small\bfseries}
\usepackage{graphicx}
\setlength{\oddsidemargin}{0cm} \setlength{\evensidemargin}{0cm} \setlength{\hoffset}{0cm} \setlength{\voffset}{-2cm}
\setlength{\textwidth}{16cm} \setlength{\textheight}{25cm} 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\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}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
{\bf Executive Summary}\\%.\\
\end{center}

\noindent The 5-7 May box corresponds to the pale blue box. It contains a lot of interesting and complex FSLE structures, especially in the 5.2-5.8\degE - 39-39.5\degN zone.\\
The anticyclonic eddy structure, located at the southern part of this 5-7 May box (about 5.5\degE - 38.4\degN), mentioned yesterday, is still there. It is clearly detected in all dynamic figures and could be crossed by the BB at the end of its eastward route at constant latitude.\\

\noindent Globally the area has warmed up and the Chl activity increased slightly.
\\
\\
%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. \\

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\noindent\makebox[\linewidth]{\rule{\textwidth}{2pt}}
%\vspace{1cm}

\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=0.65]{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}\\

\vspace{0.5cm}
\end{center}


\newpage
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\section{Ongoing operations and upcoming stations}
  
The 5-7 May region of study corresponds to the pale blue box.\\

\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}
%We added the ship location planned for today until saturday. 

The currents are relatively weak, apart 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  anticyclonic eddy corresponds to a region with higher energy.

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

This anticyclonic eddy structure is clearly detected in the FSLE figure and could be crossed by the BB at the end of its eastward route at constant latitude. The 5-7 May zone contains a lot of interesting and complex FSLE structures, especially in the 5.2-5.8\degE - 39-39.5\degN zone.

% 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 anticyclonic eddy structure at the southern part of the 5-7 May box (about 5.5\degE - 38.4\degN) is also clearly detected in the OW figure.\\

For the Garcia Del Cid: the distorted mesoscale structure mentioned in the last bulletins (located southeast of Ibiza and southwest of Majorqua) is still at the same spot.


%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.\\
In the 5-7 May box, the waters originate roughly from the south-west, with a more complex pattern (and hence origins) in the anticyclonic eddy.
%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).

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\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.
\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}\\
\vspace{0.5cm}
\end{center}
Globally the area has warmed up. 
The coldest area is the north-eastern part of the 5-7 May box.
%The scale has been changed to [14;18]\degree to adjust to the current warming of the area.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\subsection{Chlorophyll analysis}
\begin{center}
\includegraphics[scale=0.65]{figures/nrt_color_swmed.png}\\
\vspace{0.5cm}
\end{center}

\noindent Globally the Chl activity has increased slightly.
%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).

%The last clear Chl figure is from the bulletin 3 days ago, 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




\begin{center}

{\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/

\end{center}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\end{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%      