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Modeling part Hypothesis : In the heart of eddies, there is less diversity because of the isolated water body. On the edge, there is different water bodies mixed, which increase the diversity & communities. •Lagrangian analysis : drop buoys and then goings and comings from the center to the border of the eddy •Campaign : from the 16th to the 30th March 2022 in the South Atlantic  Modelisation : To confirm the exact date for the beginning of the campaign : before, during or after the bloom 60°W 10° S • Area of interest: highlighted Tara route, with a specific targeted region (between 30 ° S and 40 ° S, around 20 ° W)  near the mid-Atlantic ridge 20° S 30° S 40° S 50° S 60° 40°W 20°W 0°  There’s a strong limit between the South Atlantic Gyre and the Antarctic Circumpolar Current, around 40°S and 32°S  In the northern part, there’s less chlorophyll than the southern part Chlorophyll Chlorophyll aa concentration concentration (mg (mg chl chl .. mm-33)) averaged averaged over over march march 2015 2015 Ref : GLOBAL_REANALYSIS_BIO_001_029 : a biogeochemical model for global ocean produced at Mercator-Ocean (PISCES) with chlorophyll data from 1993 to  If we focus on the square around the 32°S limit, we can divide into 2 squares  Now we can calculate the zonal mean of chlorophyll concentration in each square (North, South and both) for each day  And then we can make a graph of chlorophyll concentration versus Chlorophyll aa concentration Chlorophyll concentration (mg .. mtime (mg chl chl m-33)) averaged averaged over over march march 2015 2015 Ref : GLOBAL_REANALYSIS_BIO_001_029 : biogeochemical model for global ocean produced at Mercator-Ocean (PISCES) with chlorophyll data from 1993 to 2019 (daily means). Source : CMEMS  Here’s the map we used to calculate the zonal daily means of chlorophyll concentration in each area (North, South and both), with the GPS coordinates we chose for these area : 25°S 30°W 10°W 35°S 45°S Ref : OCEANCOLOUR_GLO_CHL_L3_REP_OBSERVATIONS_009_085 : Global Ocean Chlorophyll from Satellite Observations (Copernicus-GlobColour). Daily means Reprocessed Results 15 to 30 of march  Here the graphic that we get by calculating the daily means of surface chlorophyll in the 3 different zones, all years combined from 2008 to 2020  The period is centered around the sampling time, from January to May  The black line represents the median, suggesting that the sum of the variabilities follow a Gaussian law  Variabilities are due to the clouds and the physical structures that will govern the chlorophyll distribution Signorini, Sergio & Hooker, Stanford & Mcclain, Charles. (2004). Bio-Optical and Geochemical Properties of the South Atlantic Subtropical Gyre. This figure supports our results: In the same period of interest, there is a clear separation of the chlorophyll contents between the South Atlantic gyre and the circumpolar current, around 35 °S Compared with the concentration scale, there is a correlation between the values found before in the north and the south area and those in the figure : North ~ less than 0.1 mg.m-3 South ~ around 0.2 mg.m-3 Figure : SeaWiFS seasonal chlorophyll climatology for the South Atlantic, with seasonal surface currents


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