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SUMMARY:Machine learning seminar series - Spatiotemporal complexity and ti
 me-dependent networks in mid- to late Holocene simulations
DTSTART:20200728T103000Z
DTEND:20200728T160000Z
DTSTAMP:20260613T064500Z
UID:indico-event-194@events.ecmwf.int
CONTACT:events@ecmwf.int
DESCRIPTION:\n\n\n\nHost\n\nMagdalena Alonso Balmaseda\n\nSpeaker\n\nDr An
 nalisa Bracco received her bachelor in Physics at the University of Torino
  in 1996 and a PhD in geosciences at the University of Genova in 2000. \n
 \nShe is currently a professor in climate dynamics and oceanography in the
  School of Earth and Atmospheric Sciences at the Georgia Institute of Te
 chnology.  Her research focuses on the transport of physical\, chemical 
 and biological material in the ocean\, and on tropical climate teleconnect
 ions\, often using tools from computer science and applied mathematics. \
 n\nIn 2011 she received the American Meteorological Society’s Nicholas F
 ofonoff award for her work on ocean turbulence and mesoscale transport.\n\
 nAbstract\n\nIn climate science regime transitions include abrupt changes 
 in modes of climate variability and shifts in the connectivity of the whol
 e system. While important\, their identification remains challenging. In t
 his talk we present a new framework to investigate regime transitions and 
 connectivity patterns in spatiotemporal climate fields. This framework fir
 st quantifies local regime shifts by means of information entropy and then
  infers a weighted\, direct and time-dependent network between entropy "do
 mains"\, i.e. areas formed by grid points that are homogeneous in terms of
  their entropy. \n\nThe spatiotemporal variability in sea surface tempera
 ture (SST) in two simulations of the last 6000 years is investigated with 
 this new approach. The largest regional regime shifts emerge as abrupt tra
 nsitions from low to high-frequency SST oscillations\, or vice versa\, in 
 both simulations. Generally\, rapid and sudden transitions in the degree o
 f connectivity of the system are observed in both simulations but\, in mos
 t cases\, at different times\, with few exceptions. We focus\, finally\, o
 n the relation between ENSO and the Indian Ocean Dipole\, looking in more 
 detail at their evolution from the mid- to late Holocene.\n\n\n\nhttps://e
 vents.ecmwf.int/event/194/
IMAGE;VALUE=URI:https://events.ecmwf.int/event/194/logo-528950275.png
LOCATION:11:30 BST
URL:https://events.ecmwf.int/event/194/
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