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<p class="MsoNormal">Hello, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Please join us for Amelia Bryan’s MS Defense on Friday, October 31 @ 9:00 am in EOAS 1036.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:black">Title: Dropsonde-Derived Tropical Cyclone Enthalpy Flux<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Name: Amelia Bryan<o:p></o:p></p>
<p class="MsoNormal">Date: Friday, October 31, 2025<o:p></o:p></p>
<p class="MsoNormal">Advisor: Mark Bourassa<o:p></o:p></p>
<p class="MsoNormal">Location: EOAS 1036<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:black">Abstract: Surface turbulent fluxes in hurricanes are important for intensity changes and maintenance of the storm, however these fluxes are poorly observed in tropical cyclones. This project improves the calculations
of air-sea turbulent surface fluxes and transfer coefficients in hurricanes determined from dropsondes, specifically focusing on enthalpy. Improvements to these calculations are accomplished through a log-profile analysis of dropsonde data which uses the conjugate-gradient
method to solve for the theoretical log-profile parameters which best match observations to the theory. These log-profile parameters are used to determine enthalpy fluxes and enthalpy transfer coefficients (Ck) for each dropsonde, many of which are rejected
through our improved quality control. We find that variability in Ck is largely due to variability in the latent heat flux, with a much smaller dependence on the air-sea temperature difference. Our drag coefficient and enthalpy coefficients are both shown
to be good matches to some prior work, but substantially different from some prior studies. Our analyses point to a likely cause for some of these differences being different atmospheric moisture conditions, and hint that additional physical processes might
influence field observations, but not be seen in laboratory observations. However, our dropsonde data cannot be used to conclusively determine if additional physical processes come into play in tropical cyclone environments nor to identify those processes. <o:p></o:p></span></p>
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<p class="MsoNormal">Best, <o:p></o:p></p>
<p class="MsoNormal">Adea<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Segoe Script"">Adea Arrison</span><span style="font-size:10.0pt;font-family:"Segoe Script""><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Segoe Script"">Sr. Academic Program Specialist<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Segoe Script"">Department of Earth, Ocean & Atmospheric Science<o:p></o:p></span></p>
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