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<p>Please join us for an EOAS Colloquium on Friday Apr 29 at 3 pm in
room 1050 and over zoom:<br>
</p>
<div class="moz-forward-container"><font size="4">Dr. Magdalena
Andres, Woods Hole Oceanographic Institution</font></div>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Title:<o:p></o:p></span></p>
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<p class="MsoNormal"><font size="6"><span style="font-size:11.0pt">PEACH PIESs: Gulf Stream
variability inferred from pressure-sensor equipped
inverted echo sounders (PIESs) as part of the Processes
driving Exchange at Cape Hatteras (PEACH) project
<o:p></o:p></span></font></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal">Abstract:<br>
<span style="font-size:12.0pt;color:black"><o:p></o:p></span><o:p></o:p>
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<p class="MsoNormal"><span style="font-family:"Times New
Roman",serif">To better
understand shelf-export mechanisms and the processes which
control the net
shelf export along the eastern US, an observational array
was deployed near
Cape Hatteras on the shelves and the neighboring
continental slopes spanning
the Hatteras Front. These observations and a hierarchy of
numerical models
comprise the National Science Foundation-funded PEACH
(Processes driving
Exchange At Cape Hatteras) Program.<span style="mso-spacerun:yes"> </span>The <i style="mso-bidi-font-style:normal">in situ</i>
observations from the 19-month
deployment of current- and pressure-sensor equipped
inverted echo sounders
(CPIESs) along and across the Gulf Stream near Cape
Hatteras capture spatial
and temporal variability where this western boundary
current separates from the
continental margin. CPIESs’ records of acoustic travel
time are used to infer
changes in thermocline depth <i style="mso-bidi-font-style:normal">D</i><sub>T</sub>
and Gulf Stream position. Wave-like Gulf Stream meanders
are observed where the
Stream approaches the separation location with periods
less than 15 days,
wavelengths less than 500-km, and phase speeds between
40-70 km d<sup>-1</sup>.
Though meander amplitude decreases by 30% on the final
approach to Cape
Hatteras, some signals are still coherent across the Gulf
Stream separation
location. Temporal variability in meander intensity may be
related to the Loop
Current ~1400 km upstream. Mesoscale variability is
strongest downstream of the
separation location where Gulf Stream position is no
longer constrained by the
steep continental slope.<span style="mso-spacerun:yes"> </span>Low
frequency
transport changes in the Florida Straits are correlated
with SSH gradients
along the entire South Atlantic Bight (SAB) and with <i style="mso-bidi-font-style:
normal">D</i><sub>T</sub> inferred at the CPIES sites.
The correlations with <i style="mso-bidi-font-style:normal">D</i><sub>T</sub> are
likely due to coherent
transport anomalies in the Gulf Stream approaching the
separation location which
then drive Gulf Stream position changes downstream of the
separation location.
The patterns of coherent transport anomalies may be
reflect large-scale
atmospheric forcing patterns or rapid equatorward
propagation of barotropic
signals along the SAB. <br>
</span></p>
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<p class="MsoNormal"><span style="font-family:"Times New
Roman",serif">Time: Apr 29, 2022 03:00 PM Eastern
Time (US and Canada)<br>
<br>
<font color="blue">Join Zoom Meeting<br>
<a class="moz-txt-link-freetext" href="https://fsu.zoom.us/j/93904494849">https://fsu.zoom.us/j/93904494849</a></font><br>
<br>
Meeting ID: 939 0449 4849</span></p>
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