Interdecadal Variation of the North Pacific Wintertime Blocking

Chen, Tsing-Chang; Yoon, Jin-ho
December 2002
Monthly Weather Review;Dec2002, Vol. 130 Issue 12, p3136
Academic Journal
Using the NCEP-NCAR reanalysis data for the past four decades (1954-97), the interdecadal variation of the North Pacific winter blocking is examined. A noticeable impact on this blocking activity exerted by the Pacific decadal oscillation (PDO: deepening of the Aleutian low and amplification of the Pacific Northwest ridge) was observed. This effect included an interdecadal increasing trend of blocking days [6.5 days (40 yr)[sup -1]] and an eastward shift of blocking activity [8.7° longitude (40 yr)[sup -1]]. The possible PDO effect on the North Pacific blocking is inferred dynamically from a streamfunction budget analysis.


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