HRD Seminar – Dr. Morgan O’Neill, T. C. Chamberlin Postdoctoral Fellow, University of Chicago – 14 November 2017

Dr. O’Neill presented a seminar on “Diurnal gravity waves as a probe of hurricanes’ internal structure“.

Abstract:

Satellite observations of cloudy hurricane canopies have shown a universal, daily, wave-like feature that propagates radially outward, as far as 600 km (Dunion et al. 2014). Daytime solar heating of a hurricane’s upper eyewall is surely responsible, but the mechanism for the wave was previously unknown. I will discuss numerical experiments that suggest these waves are internal inertia-gravity waves, and in fact, propagate through (almost!) the entire depth of the hurricane. Their structure is similar to the classical “St. Andrew’s cross” pattern response to a bobbing cylinder in a quiescent fluid. Due to the hurricane’s flow field, diurnal waves can only begin to propagate well beyond the storm core, though the anticyclonic outflow region is more receptive to near-core diurnal propagation. The prohibited region is highly sensitive to disruptions to the wind field that resemble an eyewall replacement cycle.

A recording of the presentation is available on the anonymous ftp site: ftp://ftp.aoml.noaa.gov/hrd/pub/blog/seminars/2017/ONeill_HRD_Seminar_20171114.mp4

3 Replies to “HRD Seminar – Dr. Morgan O’Neill, T. C. Chamberlin Postdoctoral Fellow, University of Chicago – 14 November 2017”

  1. The video is not playing for some reason. Is it possible that you at least send me the ppt if the recording isn’t working?

      1. The video is not playing for some reason. Is it possible that you at least send me the ppt if the recording isn’t working?

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