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Simulation of Air-Sea Coupled Modes in the Tropical Atlantic From the NCEP CFS System

Model Climatology . Simulation of Air-Sea Coupled Modes in the Tropical Atlantic From the NCEP CFS System. Jiande Wang Sudhir Nadiga David Behringer NOAA/NCEP/EMC Jiande.wang@noaa.gov. Interannual Variability. Seasonal Cycle. Introduction

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Simulation of Air-Sea Coupled Modes in the Tropical Atlantic From the NCEP CFS System

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  1. Model Climatology Simulation of Air-Sea Coupled Modes in the Tropical Atlantic From the NCEP CFS System Jiande Wang Sudhir Nadiga David Behringer NOAA/NCEP/EMC Jiande.wang@noaa.gov Interannual Variability Seasonal Cycle Introduction The climate of the tropical Atlantic undergoes strong fluctuations on a variety of time-scale ranging from seasonal through decadal. These climate fluctuations are associated with massive disruptions of populations as well as to the environment. At present time, detailed physical mechanisms responsible for this climate variability are still unclear including the atmospheric response to changing boundary conditions. Here we examine the National Center Environment Prediction (NCEP) coupled forecast system’s (CFS) simulation on this region. Precipitation • NCEP CFS System • AGCM: NCEP Global Forecast System model (GFS03) • T62L64 (apprx. 200Km a grid) • Upgrade in • Physics of radiation • Boundary layer vertical diffusion • Cumulus convection • Gravity wave drag • A prognostic cloud/ice scheme • OGCM: GFDL MOM3 • Zonal resolution: 1 degree • Meridional resolution: 0.3 degree (10S-10N), 1 degree in mid-high latitude. • 40 vertical layers • KPP vertical mixing • Gent and McWilliams scheme of horizontal mixing of tracers • Smagorinsky scheme of horizotall mixing of momentum • Coupling • No flux adjustment. • AGCM and OGCM exchange quantities once a day. • Climatology sea ice extent. • IC: Global Ocean Data Assimilation System (GODAS) SST • Testing of CFS • 33-years of free run (4 ensemble members) • Re-forecast: 1981-present with IC from each month (15 ensembel members for each month) • CFS became the NCEP operational seasonal forecast model in August, 2004. SST and TAU in equator (2S-2N averaged) Acknowledgement Great acknowledgements are due to NCEP climate modeling group: Suranjana Saha, Wanqiu Wang, Hua-Lu Pan, Glenn White, Qing Zhang and Cathy Thiaw

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