ObjectiveTo understand the impact of new land surface model (LSM) and land initial condition (IC) on Asian monsoon climate and its relationship with Indo-Pacific SST in the NCEP Climate Forecasting System (CFS).Assessment of the Impact of Different Land Surface Models and Land Initial Conditions on the Monsoon Climate in the NCEP Climate Forecast System; Evaluations over Asian Monsoon Region and Indo-Pacific Sector1Soo-Hyun Yoo , 1Jae Schemm, 1Song Yang, 2Rongqian Yang, and 2Kenneth Mitchell

1Climate Prediction Center & 2Environmental Modeling Center, NCEP/NWS/NOAA, Camp Springs, Maryland 20746, USA Data

SST: Reynolds/NCEP version 2 monthly 1x1 optimally interpolated SST (OISST)Winds: NCEP/NCAR reanalysis data (144x73)Precipitation: monthly CPC Merged Analysis of Precipitation (CMAP) data (144x72)2m Temperature: GHCN/CAMs Global T2m (T126) Model ExperimentsModels: NCEP CFST126L64 (GFS-OP3T3 & MOM-3) with OSU LSM (2 soil layers)/Noah LSM (4 soil layers)Initial conditions: Apr 19-23, 29, 30, and May 1-3 from Global Reanalysis 2 (GR2)/Global Land Data Assimilation System (GLDAS)Four configurations of T126 CFS hindcast runs: a) OSU_GR2: OSU LSM with initial land states from GR2 b) Noah_GR2: Noah LSM with initial land states from GR2 c) Noah_GLDAS: Noah LSM with initial land states from T126 GLDAS/Noah d) Noah_GLDAS_Clim: Noah LSM with initial land states from GLDAS/Noah ClimatologyExperiments: 6-month (up to September) forecast runs from 1980 to 2004 Main IssuesImprovement from OSU to Noah LSM: Comparison between the configuration a) and b)Importance of land Ics: Comparison among the configuration b), c), and d) Summary

CFS simulations change more noticeably between different land models than among different land initial conditions. The summer climatologies over Asia are more reasonably simulated in CFS Noah LSM compatible GLDAS initial conditions than other model configurations. Correlation scores for precipitaion and 2-meter temperature are the best over subtropical Asia in configuration CFS Noah_GLDAS.

*