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UID:20250801T192144EDT-8075jpha87@132.216.98.100
DTSTAMP:20250801T232144Z
DESCRIPTION:The Spring Relationship between the Pacific-North American patt
 ern and the North Atlantic Oscillation\n\nAbstract\n\nThe Pacific-North Am
 erican pattern (PNA) and North Atlantic Oscillation (NAO) are two dominant
  modes of low-frequency variability in the Northern Hemisphere winter. Gen
 erally these two patterns are separable\, and uncorrelated in both space a
 nd time\; however\, recent studies have found such a link during the winte
 rs of certain decades.  The present study documents an observed relationsh
 ip between the PNA and NAO which is consistently present during the spring
  and early summer. This relationship is shown to be due to the fact that t
 he PNA and NAO are spatially overlapping projections of the same pattern o
 f variability\, given by the first EOF of 500 hPa geopotential height. Bot
 h the PNA and NAO patterns correlate more strongly to the first EOF’s spat
 ial pattern\, resembling the Aleutian low-Icelandic low seesaw pattern\, t
 han the rotated EOF (REOF) loading patterns used to compute their respecti
 ve indices. Furthermore\, when the two patterns are correlated\, the effec
 t of El-Nino on the Northern Hemisphere is distinct from the pattern assoc
 iated with the PNA. We further examine a 21-year period in the winter for 
 which the PNA and NAO are significantly correlated\, and find that the con
 clusions drawn from the spring hold true. The results presented herein dem
 onstrate that defining the PNA and NAO based upon typical predefined loadi
 ng patterns may not be the ideal approach\; especially given that the patt
 erns are spatially similar and covary in time.\n
DTSTART:20151125T193000Z
DTEND:20151125T203000Z
LOCATION:Room 934\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Student Seminar: Nicholas Soulard
URL:/meteo/channels/event/student-seminar-nicholas-sou
 lard-255061
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