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UID:20250908T212744EDT-55867tUPCX@132.216.98.100
DTSTAMP:20250909T012744Z
DESCRIPTION:Dr. Melissa Gervais\, Postdoctoral Fellow\, Lamont-Doherty Eart
 h Observatory\,Columbia University\n\nTitle:  Impacts of the North Atlanti
 c Warming Hole on Atmospheric Circulation and Arctic Air Masses\n\nAbstrac
 t:  Increased lower-tropospheric warming in the Arctic compared to the low
 er latitudes\, known as Arctic amplification\, is an important change to t
 he mean atmospheric circulation associated with climate change.  In additi
 on to changes in the mean state\, it is important to understand the couple
 d earth-system mechanisms that act to perturb the distribution of Arctic a
 nd mid-latitude weather regimes in a future climate\, providing insight in
 to how we interpret future weather and climate risk.\n\nIn this seminar\, 
 I will demonstrate how the frequency of occurrence of Arctic air mass patt
 erns may change throughout the 21st century by applying a method of self-o
 rganizing maps to the Community Earth System Model Large-Ensemble (CESM-LE
 ) RCP 8.5 experiment to identify dominant patterns of atmospheric variabil
 ity.  Results from this study indicate that the development of a warming d
 eficit in North Atlantic sea surface temperatures (SSTs) south of Greenlan
 d\, known as the North Atlantic Warming Hole\, may act to force changes in
  the frequency of some of these patterns of Northern Hemisphere variabilit
 y.\n	To elaborate on this mechanism of future climate variability\, I will 
 provide an overview of the current knowledge of this North Atlantic warmin
 g hole and present results from my recent study demonstrating how increase
 d freshwater fluxes are predominantly responsible for the generation of th
 is phenomena. Finally\, results from a set of Community Atmosphere Model 5
  (CAM5) large ensemble (25 member) atmosphere-only modelling experiments w
 ill be presented in which surface boundary conditions in the North Atlanti
 c Ocean are altered to explore the impacts of the North Atlantic warming h
 ole on atmospheric circulation and patterns of Arctic air mass variability
 .\n
DTSTART:20170202T200000Z
DTEND:20170202T213000Z
LOCATION:Room 934\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Departmental Seminar: Impacts of the North Atlantic Warming Hole on
  Atmospheric Circulation and Arctic Air Masses by Dr. Melissa Gervais
URL:/meteo/channels/event/departmental-seminar-impacts
 -north-atlantic-warming-hole-atmospheric-circulation-and-arctic-air-265353
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