%0 Journal Article
%T Observational Zonal Mean Flow Anomalies:Vacillation or Poleward Propagation?<br>Observational Zonal Mean Flow Anomalies: Vacillation or Poleward Propagation?
%A SONG Jie
%A <br>SONG
%A Jie
%J 大气和海洋科学快报
%D 2013
%I 
%X North-south displacements and meridional vacillations of the eddy-driven jet are widely accepted as the dominant cause of variability of the observational zonal-mean zonal wind anomalies(denoted u]’).In this study,a new idea regarding the primary variability of the observational u]’ in the middle latitude troposphere is presented.It is hypothesized that there are two different classes of primary variability of the observational u]’:the poleward propagation of the u]’(abbreviated as PP) and meridional vacillations.To validate this hypothesis,one-point correlation maps of u]’ at 200-hPa during the boreal cold season(November-April) of every year from 1957-2002 are used as a criterion.Twelve PP years,in which the PP events are dominant in the variability of u]’,and 15 no_PP years,in which the PP events are recessive and the meridional vacillations are dominant in the variability of u]’,are examined.The results show that the variabilities of u]’ are different in the chosen PP and no_PP years.In the PP years,the PP events dominate the variability of u]’;however,the meridional vacillations are prevalent in the no_PP years.
%K zonal-mean zonal wind
%K zonal index
%K poleward propagation<br>zonal-mean
%K zonal
%K wind
%K zonal
%K index
%K poleward
%K propagation
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=28A2F569B2458C17&jid=DFA1C03CBD38122A6831EBC757FD100F&aid=4D6BB6A422263A4575CA7A80BFC1B37A&yid=FF7AA908D58E97FA&vid=B31275AF3241DB2D&iid=CA4FD0336C81A37A&sid=CA4FD0336C81A37A&eid=DF92D298D3FF1E6E&journal_id=1674-2834&journal_name=大气和海洋科学快报&referenced_num=0&reference_num=0