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Objective

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 Sector 1 Soo-Hyun Yoo , 1 Jae Schemm, 1 Song Yang, 2 Rongqian Yang, and 2 Kenneth Mitchell

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Objective

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  1. 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 Sector 1Soo-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 Objective To 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). Data • SST: Reynolds/NCEP version 2 monthly 1°x1° 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 Experiments • Models: 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 Climatology • Experiments: 6-month (up to September) forecast runs from 1980 to 2004 • Main Issues • Improvement 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.

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