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<p class="MsoNormal"><span style="font-family:"Times New
Roman",serif;
mso-fareast-font-family:"Times New
Roman";mso-ansi-language:EN-US;mso-fareast-language:
FR" class="" lang="EN-US">Title :</span><span style="font-family: "Times New Roman", serif;" class="" lang="EN-US">Reconstruction
of Agulhas Rings paths and </span><span style="font-family: LMRoman12, serif;" class="" lang="EN-US">thermohaline structures</span><span style="font-family: "Times New
Roman", serif;" class="" lang="EN-US"> by satellite altimetry and Argo profiling
float data.</span> </p>
<p class="MsoNormal"><span style="font-family:"Times New
Roman",serif;
mso-fareast-font-family:"Times New
Roman";mso-ansi-language:EN-US;mso-fareast-language:
FR" class="" lang="EN-US">Speaker: Remi Laxenaire</span></p>
<p class="MsoNormal"><span style="font-family:"Times New
Roman",serif;
mso-fareast-font-family:"Times New
Roman";mso-ansi-language:EN-US;mso-fareast-language:
FR" class="" lang="EN-US">Location: COAPS conference room (2nd
floor, Research A, Innovation Park)</span></p>
<p class="MsoNormal"><span style="font-family:"Times New
Roman",serif;
mso-fareast-font-family:"Times New
Roman";mso-ansi-language:EN-US;mso-fareast-language:
FR" class="" lang="EN-US">Time: Thursday Sept. 12th at 11:00 AM<br>
</span></p>
<p class="MsoNormal"><span style="font-family:"Times New
Roman",serif;
mso-fareast-font-family:"Times New
Roman";mso-ansi-language:EN-US;mso-fareast-language:
FR" class="" lang="EN-US">Abstract :</span></p>
<p class="MsoNormal"><span style="font-family: LMRoman12, serif;" class="">The Indo-Atlantic interocean heat exchanges are tightly linked to global ocean circulation and climate. They are principally achieved by the Agulhas Rings (AR), the largest mesoscale
eddies of the world ocean, which are investigated in this study by means of 24 years (1993-2016) of daily satellite-altimetry maps and Argo floats profiles.</span></p>
<p class=""><span style="font-family:"LMRoman12",serif;mso-ansi-language:
EN-US" class="" lang="EN-US">By applying the TOEddies eddy identification and tracking algorithm to daily maps of Absolute Dynamical Topography (ADT), we estimate Agulhas Rings
origins, paths and lifetime. The main novelty lies in the detection of numerous eddies splitting and merging events that leads to the definition of a network of trajectories instead of a biunivocal identification between an eddy with a single trajectory. The
results obtained by the network differ considerably with previous estimates connecting eddies formed in the Indian Ocean upstream of the Agulhas Current to eddies in the Brazil Current.
</span><span class="" lang="EN-US"></span></p>
<p class=""><span style="font-family:"LMRoman12",serif;mso-ansi-language:
EN-US" class="" lang="EN-US">The collocation of the reconstructed segments of AR trajectories with Argo profiling floats gives access to their thermohaline structure. These data
allow to estimate the evolution of AR along their trajectories. In particular, we show en route modification of an AR, transitioning from a surface to a subsurface intensified eddy subducting when entering the South Atlantic subtropical gyre. Moreover, in
the Cape Basin, before its subduction, this AR undergoes to very intense air-sea interactions that lead to a very deep mixing layer. Here the eddy upper-core of Indian Ocean thermocline waters are significantly cooled. These waters transform into mode waters
once the eddy subducts into the ocean interior. </span><span class="" lang="EN-US"></span></p>
<span style="font-family:"LMRoman12",serif;mso-ansi-language:
EN-US" class="" lang="EN-US">Finally, an estimate of AR geographical distribution from the numerous eddies detected in the Cape Basin and South Atlantic Ocean show that the reconstructed AR
is not an exception as AR generally subduct when they leave the Cape Basin. <br>
</span>
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