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Sorry for the error, this seminar will ONLY be on zoom as the
speaker will be presenting remotely!<br>
<div class="moz-forward-container"><br>
<p>Please join us for an EOAS Colloquium on Friday Apr 29 at 3 pm
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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<span style="font-family:"Times New Roman",serif"></span><br>
<span style="font-family:"Times New Roman",serif"></span>
<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" moz-do-not-send="true">https://fsu.zoom.us/j/93904494849</a></font><br>
<br>
Meeting ID: 939 0449 4849</span></p>
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<pre class="moz-signature" cols="72">--
Amy Baco-Taylor, PhD
Professor
Earth, Ocean, and Atmospheric Sciences
Florida State University
(850) 645-1547
<a class="moz-txt-link-abbreviated" href="mailto:abacotaylor@fsu.edu">abacotaylor@fsu.edu</a></pre>
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