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)

2. Oceanic Component:

• GFDL MOM3 (Pacanowski and Griffies, 2000)

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

• Quasi-global domain (74°S to 64°N)

• Free surface

3. 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:

• NCEP GODAS

-    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