[Eoas-seminar] PO seminar 03/07

eoas-seminar at lists.fsu.edu eoas-seminar at lists.fsu.edu
Mon Mar 7 10:07:33 EST 2016


*** reminder *** today ****
 Physical Oceanography seminar


Monday March 7 2016, 3:00pm, Room 327, OSB


Title: Interactions between the Somali Current eddies during the
summer monsoon: insights from a numerical study

by Dr. Bernard Barnier, LGGE, Grenoble

Abstract

Three  hindcast  simulations  of  the  global  ocean  circulation  differing  by
resolution (1/4 or 1/12) or parameterization or atmospheric forcing are used
to describe the interactions between the large anticyclonic eddies generated  by
the  Somali  Current   system  during   the  Southwest   Monsoon.  The   present
investigation of the Somalian  coherent eddy structures  allows to identify  the
origin and the  subsequent development of  the cyclones flanked  upon the  Great
Whirl (GW)  previously  identified  by  Beal and  Donohue  (2013)  in  satellite
observations and to establish  that similar cyclones are  also flanked upon  the
Southern Gyre (SG). These cyclones are identified as potential actors in  mixing
water masses within the large eddies and offshore the coast of Somali. All three
simulations bring to light that during the period when the Southwest Monsoon  is
well established, the SG moves northward  along the Somali coast and  encounters
the GW.  The interaction  between  the SG  and the  GW  is a  collision  without
merging, in a way that has not been described in observations up to now.  During
the collision the  GW is pushed  to the  east of Socotra  Island, sheds  several
smaller patches of anticyclonic  vorticity, and often  reforms into the  Socotra
Eddy, thus proposing  a formation mechanism  for the Socotra  Eddy. During  this
process the GW gives up its place  to the SG. This process is robust  throughout
the three simulations.



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