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SUMMARY:The pathway of atmospheric water vapor from ocean evaporation to r
 ainout in extratropical weather systems
DTSTART:20101025T161500
DTSTAMP:20260916T065511Z
UID:e7d24da21f044fe1a5b3360284971347f7a3f8523f8abd74cb113406
CATEGORIES:Conferences - Seminars
DESCRIPTION:Wernli\, Heini (ETHZ)\nThe dynamics of extratropical weather s
 ystems is strongly influenced by diabatic processes\, in particular latent
  heating due to condensation of water vapor within clouds. Examples are th
 e intensification of extratropical cyclones due to latent heat release and
  the modification of near-tropopause Rossby waves by cross-isentropic tran
 sport within so-called warm conveyor belts. The first part of the presenta
 tion will illustrate this key linkage between weather system dynamics and 
 atmospheric moisture. The second part will address the issue of water vapo
 r origin and transport from the evaporation region into developing weather
  systems. It will be shown that certain weather systems "consume" large am
 ounts of moisture that have been advected from remote areas (e.g.\, the tr
 opics)\; whereas in other cases local evaporation\, induced by the system 
 itself\, plays the key role. The strongly differing residence times associ
 ated with the two scenarios (long-range transport vs. local sources) might
  be important for considering the implications of climate change on the dy
 namics of weather systems. The final part will address the potential of ob
 servational and modeling studies of stable water isotopes to further explo
 re the role of water vapor pathways for extratropical weather systems.
LOCATION:GR A3 31
STATUS:CONFIRMED
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