《On the Blocking Flow Patterns in the Euro-Atlantic Sector: A Simple Model Study》.pdf

《On the Blocking Flow Patterns in the Euro-Atlantic Sector: A Simple Model Study》.pdf

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《On the Blocking Flow Patterns in the Euro-Atlantic Sector: A Simple Model Study》.pdf

ADVANCESIN ATMOSPHERIC SCIENCES,VOL.3I,SEPTEMBER2014,l181-1196 OntheBlockingFlow PatternsintheEuro-AtlanticSector: A SimpleM odelStudy LUODehai1,2andYAO Yao1,2 。PhysicalOceanographyLaboratory , CollegeofPhysicalandEnvironmentalOceanograph~ OceanUniversityofChina,Qingdao266100 KeyLaboratoryofRegionalClimate—EnvironmentforEastAsia,ChineseAcademyofScience,BeOing100029 (Received25September2013;revised18January2014;accepted27February2014) ABSTRACT Theflow patternsofEuro-Atlanticblockingeventsinwinterraeinvestigatedbydividingthesectorintothreesub— regions:60。一3O。W (Greenlandregion);20。W-30。E[easternAtlantic-Europe(EAE)region];and50。一90。E(Uralregion). Itisshownthatblockingeventsinwinterareextremelyfrequentinthethreesub—regions.Composite500一mbgeopotential heightfieldsforintenseandlong—livedblockingeventsdemonstratethattheblockingfieldsoverGreenlandandUralregions exhibitsouthwest—northeast(SW-NE)andsoutheast-northwest(SE-NW)orienteddipole—typepatterns.respectively,while thecompositefieldovertheEAE regionexhibitsanQ—typepattern.Thetypeofcompositeblockingpatternseemstobe relatedtothepositionoftheblockingregionrelativetothepositivecenteroftheclimatologicalstationraywave(CSW ) anomalyexistingnera 1O。W Thephysicalcauseofwhythereraedifferentcompositeblockingtypesinthethreesubregionsisidentifiedusinga nonlinera multiscaleinteractionmode1.Itisfoundthatwhentheblockingeventisinalmostthesamepositionasthepositive CSW anomaly,theplanetary—scalefieldcanexhibitanQ—typepatternduetotheenhancedpositiveCSW anomaly.Neverthe— less,aSW—NE(SE—NW1orienteddipole—typeblock

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