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SUMMARY:Atmospheric &amp\; Oceanic Applications of Eulerian and Lagrangian
  Transport Modelling - Joakim Kjellsson (British Antarctic Survey)
DTSTART:20140521T100000Z
DTEND:20140521T110000Z
UID:TALK51858@talks.cam.ac.uk
CONTACT:Dr Dan Jones
DESCRIPTION:This thesis presents several ways to understand transports of 
 air and water masses in the atmosphere and ocean\, and the transports of e
 nergy they imply.  It presents work using both various kinds of observatio
 ns and computer simulations of the atmosphere and oceans.  One of the main
  focuses is to identify similarities and differences between models and ob
 servations\, as well as between different models.\n\nThe first half of the
  thesis applies Lagrangian methods to study flows in the atmosphere and oc
 eans.  Part of the work focuses on understanding how particles follow the 
 currents in the Baltic Sea and how they disperse.  It is suggested that th
 e commonly used regional ocean model for the Baltic Sea\, RCO\, underestim
 ates the transport and the dispersion of the particles\, which can have co
 nsequences for studies of e.g. biogeochemistry as well as for operational 
 use.  A similar methodology is used to study how particles are transported
  between the tropics and mid-latitudes by the large-scale atmospheric circ
 ulation.  It is found that the mass transport associated with northbound a
 nd southbound particles can cancel in the zonally averaged circulation\, a
 nd it is proposed that the degree of cancellation depends on the method of
  averaging.\n\nThe latter half of the thesis focuses on Eulerian stream fu
 nctions and specifically a thermodynamic stream function that combines the
  zonal and meridional circulations of the atmosphere into a single circula
 tion.  The stream function is used as a diagnostic to study the inter-annu
 al variability of the intensity and thermodynamic properties of the global
  atmospheric circulation.  A significant correlation to ENSO variability i
 s found both in reanalysis and the EC-Earth coupled climate model.  It is 
 also shown that a set of models from the CMIP5 project show a slowdown of 
 the atmospheric circulation as a result of global warming and associated c
 hanges in near-surface moisture content and upper-level radiative cooling.
 \n
LOCATION:British Antarctic Survey\, Room 330B
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