A QUASIGLOBAL CONFIGURATION OF ROMS OR, TOWARDS GOMS

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• A QUASI-GLOBAL CONFIGURATION OF ROMS (OR, TOWARDS
  GOMS?)
• Guillermo Auad Art Miller (CRD/SIO)
• Grid features
• zonal resolution 0.8º (fixed) meridional
  resolution 0.3 to 0.7º (slowing varying
  ?resolution lt 1.5) vertical resolution 20
  levels.
• Includes fixed Iceshelf, topography from etopo2.
• Zonal walls at 80º (N S).
• E-W periodic condition used at longitude 180º.
• Runs carried out so far
• 1.- Spin up climatological run from rest and
  Levitus T-S. (60-year long) driven by NCEP/NCAR
  reanalysis wind stresses and heat fluxes.
• 2.- 56-year long hindcast run (i.e., climat.
  anomalous winds and heat fluxes), from 1948 to
  2003 (finished a few days ago).

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Organization
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Scaling of horizontal viscosity
coefficient goal for each grid cell to
proportionally (to its grid size) contribute
potential vorticity to western boundary layers.
ß ?x Ah ?xxxx (1) but since Ah
needs to satisfy a minimum value in order to
yield realistic solutions (Bryan, Manabe and
Pacanowski, 1975) Ahgt 0.17 ß dx³
(2) from (1) and (2) we can scale Ah as Ah
Ah0 (dx/dx0)3 cos(f)cos(f0)
(3) where the subindex 0 marks the latitude, and
viscosity of the largest grid size in the domain
(dx0). In practice Obtain Ah0 from (2) (i.e.,
for the largest grid size), and then obtain the
rest using (3).
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Kuroshio, Oyashio, Liman, Tsuchiya Tsugaru
Currents
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ROMS
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Whitworth Peterson (1985)()134 ??13Sv
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Water Masses today the NPIW
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• Couple GOMS to an atmospheric model (ECPC
  fcsts)
• Use its output (climat hincdast) as OBCs in
  regional models (a few latin american scientists
  are interested in this)
• Sea level () climatic studies.
• Studies on water mass formation (NPIW and Ross
  Sea area)
• Future runs/planned improvements
• Filter forcing with Killworth's matrix to obtain
  more realistic amplitudes () (e.g., Nino3.4
  index).
• Include sea-ice.
• () underway