BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Mathematical and computational modelling of tropical storms and in
 cipient hurricanes - Prof Rupert Klein\, Freie Universität Berlin
DTSTART:20220610T140000Z
DTEND:20220610T150000Z
UID:TALK175409@talks.cam.ac.uk
CONTACT:Samantha Selvini
DESCRIPTION:*GAPSTI Science & Technology Distinguished Seminars Series*\n\
 nFriday 10 June\, 3:00 pm\n\nMaxwell Centre\, Cambridge & on Zoom\n\n*Math
 ematical and computational modelling of tropical storms and incipient hurr
 icanes*\n\nThis talk will report on recent research into the atmospheric f
 low regime near the transition from storms to hurricanes. This regime is c
 haracterized by atmospheric vortices with very strongly tilt that are very
  far from being small perturbations away from an upright vortex as studied
  intensively before. Moreover\, the decisive structure of a "hurricane eye
 " and of the associated strong secondary circulation in the "eye wall" is 
 not yet established. \n\nThe seminar will begin by summarizing the unifie
 d asymptotic framework for atmospheric modelling which this work is built 
 upon. The specification of this framework to the incipient hurricane regim
 e consists of a multi-faceted matched asymptotic expansion in the radial a
 nd vertical directions relative to a strongly tilted and time-evolving vor
 tex centreline. The resulting model equations reveal two essentially diffe
 rent mechanisms for the intensification and stabilization of the vortex in
  the bulk of the troposphere\, they explain the control of convection in a
  vertical layer of intermediate height\, and they account for the effects 
 of strong friction in a bottom boundary layer. As an interesting spin-off\
 , this theory has stimulated an extension of the classical quasi-geostroph
 ic/Ekman layer theory for atmospheric flows in the middle latitudes to acc
 ommodate an intermediate "diabatic layer" in which the strong influence of
  moist processes finds an explicit expression.\n\nResults from the asympto
 tic model compare favourably with full-fledged three-dimensional computati
 onal simulations of idealized storms\, the latter carried out with a semi-
 implicit well-balanced scheme for compressible flows. Moreover\, advanced 
 techniques of data analysis and visualization help to identify core featur
 es predicted by the asymptotics also in computational reconstructions of h
 istorical storms.\n\n_About the speaker_\n\nRupert Klein holds a Professor
 ship for Theoretical and Computational Geophysical Fluid Dynamics at the D
 epartment of Mathematics and Informatics at Freie Universität Berlin\, Ge
 rmany\, where his research group is based.\n\nRupert holds a diploma in me
 chanical engineering\, with specialization in combustion theory\, and obta
 ined a doctoral degree focusing on the computational modelling of knock in
  internal combustion engines.\n\nHe has carried extensive and varied work 
 at Princeton University\, RWTH Aachen\, Bergische Universität Wuppertal\,
  as well as acting as department head for Data and Computation at the Pots
 dam Institute for Climate Impact Research (PIK)\, and as professor of Appl
 ied Mathematics/Scientific Computing at the Freie Universität Berlin.\n\n
 In the course of his research\, Rupert has developed and utilized methods 
 of multiscale mathematical modelling and addressed a broad range of applic
 ations from combustion\, via atmospheric flows and molecular physics to th
 e dynamics of excitons in semi-conducting materials. \n\nAmong other honou
 rs\, Rupert has received the German Leibniz Research Prize of Deutsche For
 schungsgemeinschaft (DFG)\, become a member of the Berlin-Brandenburg Acad
 emy of Sciences and been a Fellow of the European Center for Medium Range 
 Weather Forecasts (ECMWF).\n\n*Register for this FREE talk here: https://f
 orms.gle/97Wef9kBXBS4CBTu7*\n\nFriday 10 June\, 3:00 pm\n\nJJ Thomson semi
 nar room\, \nMaxwell Centre\,\nJJ Thomson ave\,\nCambridge CB3 0HE\n\nZoom
  link: https://bit.ly/3OYswjg\n\nMeeting ID: 815 2886 8878 \nPasscode: 818
 779 \nFind your local number: https://us06web.zoom.us/u/kb0WU1V4mi\n\n\n(P
 hoto credit: Oberwolfach Photo Collection  https://owpdb.mfo.de )\n
LOCATION:Hybrid - Maxwell Centre &amp\; on Zoom
END:VEVENT
END:VCALENDAR