HR: 11:30h
AN: A32A-05    [Abstracts]
TI: Impact of ocean surface condition on the simulation of the MJO by NCEP GFS and CFS models
AU: * Wang, W
EM: wanqui.wang@noaa.gov
AF: CPC/NCEP/NWS/NOAA, 5200 Auth Road, RM 605, Camp Springs, MD 20746 United States
AU: Moorthi, S
EM: Shrinivas.Moorthi@noaa.gov
AF: EMC/NCEP/NWS/NOAA, 5200 Auth Road, RM 206, Camp Springs, MD 20746 United States
AU: Pan, H
EM: Hualu.Pan@noaa.gov
AF: EMC/NCEP/NWS/NOAA, 5200 Auth Road, RM 206, Camp Springs, MD 20746 United States
AU: Kumar, A
EM: Arun.Kumar@noaa.gov
AF: CPC/NCEP/NWS/NOAA, 5200 Auth Road, RM 605, Camp Springs, MD 20746 United States
AB: Maintenance of correct activities of the Madden-Julian Oscillation (MJO) has been one of the major difficulties in the forecast of atmospheric subseasonal variability with numerical models. Possible reasons for the unsatisfactory representation of the MJO in the numerical models include inaccurate parameterization of physical processes in the atmosphere, insufficient model resolution, and incorrect treatment of the ocean surface. In this study, we examine the impact of ocean surface condition on the simulation of the MJO by NCEP models. Results from both uncoupled atmospheric T62/64-layer version of the Global Forecast System (GFS) model and the Coupled Forecast System (CFS) model consisting of GFS and Modular Ocean Model version 3 (MOM3) will be presented. Simulations with GFS model are made with both climatological and interannually varying sea surface temperatures (SSTs) to test the sensitivity of the GFS to the change in sea surface condition. Simulations with the CFS model are conducted with and without ocean-surface flux correction to investigate the impact of air-sea coupling and errors in SSTs in the coupled model. Diagnoses are based on 20-year simulations.
DE: 3337 Numerical modeling and data assimilation
DE: 3339 Ocean/atmosphere interactions (0312, 4504)
SC: Atmospheric Sciences [A]
MN: 2005 Joint Assembly