<div class="description">
<p>The  short  term  teleconnections  arising  from  an  individual  tropical  cyclone  in  the  western  Pacific  were  examined  using  a  global  operational  data  assimilation  system  and  forecast  model.  In  the  data  assimilation,  the  tropical  cyclone  was  modified  using  a  tropical  cyclone  bogusing  procedure  that  either  maintained  the  storr.'  in,  or  eliminated  the  storm  from,  the  model's  initial  conditions.  These  differant  initial  conditions  were  used  as  the  initial  fields  for  several  20  day  runs  of  thfJ  forecast  model.  These  runs  were  used  to  simulate  the  global  atmosphere  with  and  without  the  tropical  cyclone.  The  differences  between  these  simulations  were  used  to  infer  the  global  teleconnection  response  to  the  tropical  cyclone.  This  response  was  dominated  by  a  strong,  quasi-stationary  Rossby  wave  train  that  extended  from  east  Asia  across  the  North  Pacific  into  North  America.  This  wave  train  was  initiated  when  an  anticyclonic  circulation  formed  near  Japan  as  the tropical  cyclone  approached  the  east  Asian  jet.  The  anticyclone  formation  was  primarily  the  result  of  the  absolute  vorticity  advection  by  the  divergent  wind  and  vortex  stretching  (i.e.,  the  Rossby  wave  source)  associated  with  the  tropical  cyclone.  The  wave  response  continued  to  develop  after  this  wave  source,  and  the  tropical  cyclone  itself,  dissipated.  This  development  was  clearly  seen  in  the  growth  and  eastward  propagation  of  Rossby  wave  energy  across  the  midlatitude  North  Pacific  and  North  America.  The  growth  tended  to  be  greater  near  areas  of  potential  barotropic  instability  along  the  North  Pacific  jet,  while  the  propagation  tended  to  occur  parallel  to  the  jet.  The  net  effect  of  the  tropical  cyclone  was  especially  evident  in  the  North  Pacific  - North  American  region, where  the  model  atmosphere  with  the  tropical  cyclone  showed  a  midlalitude  jet  and  storm  track  that  were  markedly  different  from  the  jet  and  storm  track  seen  in  the  model  atmosphere  without  the  tropical  cyclone.  The  two  tropical  cyclones  investigated  in  this  study  were  super  typhoon  Yuri  (November-December  1991)  and  typhoon  Robyn  (August  1993).
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<br>Subjects: NA</div>
<div class="fn value">
Springer, Cory A.</div>
Internet Archive identifier