One-Tier Climate Forecast System



 System Specifications:

  1. Atmospheric Component:

  • Global Forecast System 2003

  • T62 in horizontal; 64 layers in vertical

  • Recent upgrades in model physics

    - Solar radiation (Hou, 1996)

    - Cumulus convection (Hong and Pan, 1998)

    - Gravity wave drag (Kim and Arakawa, 1995)

    - Cloud water / ice (Zhao and Carr, 1997)

  1. Oceanic Component:

  • GFDL MOM3 (Pacanowski and Griffies, 2000)

  • 1/3 x 1in tropics; 1 x 1 in the extratropics; 40 layers

  • Quasi-global domain (74S to 64N)

  • Free surface

  1. Coupling:

  • Once-a-day coupling without flux correction

  • Sea ice extent taken as observed climatology

    Atmospheric Initial Condition:

  • NCEP Reanalysis-2

  • -    The reanalysis-2 is an operational product and part of the CFS with a 4-day lag.

    -    The pentad global precipitation analysis will become operational in the near future.

    Oceanic Initial Condition:


  • -    GODAS runs in two modes, a 14-day lag final cycle and a 7-day lag CFS analysis

    Ensemble Strategy:

  • One 10-month run per day

    -   A 20-30 member ensemble can be obtained at any time.

  • 7-day lag GODAS analysis

  • -   Daily update from the 14-day lag GODAS analysis

    Link:  NCEP Climate Forecast System Homepage



Back  Top

Climate Prediction Center,    Environment Modeling Center
Climate Service Division,     Hydrology Laboratory

National Weather Service
Office of Science and Technology
1325 East-West Highway
Silver Spring, MD 20910
Page Author: Science and Technology Infusion Plan for Climate Services
Page last modified: 14-Jan-2005
Disclaimer Privacy Policy