HR: 0830h
AN: A41B-07    [Abstracts]
TI: A High Resolution Coupled General Circulation Model for Subseasonal Forecast: Impact of Horizontal Resolution on Simulation and Retrospective Forecast of Intraseasonal Oscillations
AU: * Vintzileos, A
EM: Augustin.Vintzileos@noaa.gov
AF: NOAA/NWS/NCEP/EMC, 5200 Auth Rd. Room 207, Camp Springs, MD 20746
AU: * Vintzileos, A
EM: Augustin.Vintzileos@noaa.gov
AF: UCAR, Boulder, CO,
AU: Saha, S
EM: Suranjana.Saha@noaa.gov
AF: NOAA/NWS/NCEP/EMC, 5200 Auth Rd. Room 207, Camp Springs, MD 20746
AU: Pan, H
EM: Hualu.Pan@noaa.gov
AF: NOAA/NWS/NCEP/EMC, 5200 Auth Rd. Room 207, Camp Springs, MD 20746
AU: Johansson, A
EM: Ake.Johansson@noaa.gov
AF: NOAA/NWS/NCEP/EMC, 5200 Auth Rd. Room 207, Camp Springs, MD 20746
AU: Johansson, A
EM: Ake.Johansson@noaa.gov
AF: SAIC, Beltsville, MD,
AU: Johansson, A
EM: Ake.Johansson@noaa.gov
AF: Swedish Meteorological and Hydrological Institute, Sweden,
AU: Thiaw, C
EM: Catherine.Thiaw@noaa.gov
AF: NOAA/NWS/NCEP/EMC, 5200 Auth Rd. Room 207, Camp Springs, MD 20746
AU: Thiaw, C
EM: Catherine.Thiaw@noaa.gov
AF: IMSG, Beltsville, MD,
AB: General circulation models are notorious for their misrepresentation of Tropical Intraseasonal Oscillations. Hitherto, some improvements due to (i) increased vertical resolution, (ii) the type of convective parameterizations and (iii) coupling to ocean have been reported. Here we investigate the impact of increasing horizontal resolution in a high vertical resolution atmospheric component of a coupled ocean - atmosphere model. The high vertical resolution assures consistency with the horizontal discretization in both coarse and dense configurations. A series of retrospective forecast of Tropical Intraseasonal Oscillations from 1997 to 2004 performed with the GFS-T126L64/MOM3 is compared to the results of the operational version of the NCEP coupled seasonal forecasting dynamical system CFS i.e., GFS-T62L64/MOM3. In order to account for the effects of model drift and initialization shocks to the TIO, we further extend this comparison to long coupled experiments where the initial adjustment period is removed.
DE: 3309 Climatology (1620)
DE: 3339 Ocean/atmosphere interactions (0312, 4504)
DE: 3374 Tropical meteorology
DE: 4215 Climate and interannual variability (3309)
DE: 4522 El Ni¤o
SC: Atmospheric Sciences [A]
MN: 2005 Joint Assembly