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UID:20260701T153149EDT-3921zVAun1@132.216.98.100
DTSTAMP:20260701T193149Z
DESCRIPTION:January 12\, 2017\, 3:30 pm\, Burnside Hall 934\n	Dr. Michael Gh
 il\, Distinguished Research Professor\, Atmospheric & Oceanic Sciences\, U
 CLA\n	Title:  The Wind-Driven Ocean Circulation: Bifurcations\, Simulations
  and Observations\n	Abstract:  The large-scale\, near-surface flow of the m
 id-latitude oceans is dominated by the presence of a larger\, anticyclonic
  and a smaller\, cyclonic gyre. The two gyres share the eastward extension
  of western boundary currents\, such as the Gulf Stream or Kuroshio\, and 
 are induced by the shear in the winds that cross the respective ocean basi
 ns. This physical phenomenology is described by a hierarchy of models — qu
 asi-geostrophic\, shallow-water and primitive equations\, with an increasi
 ng horizontal resolution and number of vertical levels. We study the low-f
 requency variability (LFV) of this wind-driven\, double-gyre circulation i
 n mid-latitude ocean basins\, subject to time-constant\, purely periodic a
 nd more realistic forms of time-dependent wind stress. Both analytical and
  numerical methods of dynamical systems theory are applied to the models o
 f interest. Recent work has focused on the application of non-autonomous a
 nd random forcing to  double-gyre models. We discuss the associated pullba
 ck and random attractors and the non-uniqueness of the invariant measures 
 that are obtained. The effects of the oceanic LFV on the atmosphere above 
 are explored and compared to observations. Finally\, connections are made 
 with the highly topical issues of climate change and climate sensitivity. 
 This talk reflects collaborative work with a large and still increasing nu
 mber of people.\n\nPlease visit\n\nhttps://dept.atmos.ucla.edu/tcd for the
 ir names\, affiliations\, and respective contributions.\n	References\n	1. H.
  A. Dijkstra and M. Ghil\, 2005: Low-frequency variability of the\n	large-s
 cale ocean\n	circulation: A dynamical systems approach\, Rev. Geophys.\, 43
 \, RG3002\,\n	doi:10.1029/2002RG000122.\n	2. M. Ghil\, 2016. The wind-driven
  ocean circulation: Applying dynamical\n	systems\n	theory to a climate probl
 em\, Discr. Cont. Dyn. Syst. – A\, 37(1)\, 189–228\,\n	doi:10.3934/dcds.201
 7008.\n
DTSTART:20170112T203000Z
DTEND:20170112T220000Z
LOCATION:Room 934\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Departmental Seminar: The Wind-Driven Ocean Circulation: Bifurcatio
 ns\, Simulations and Observations by Dr. Michael Ghil
URL:/channels/event/departmental-event-wind-driven-oce
 an-circulation-bifurcations-simulations-and-observations-dr-michae-265045
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