Global Modeling and Assimilation Office

Weather | Mission Support | Composition | Reanalysis | Carbon
CFv2 Home | Datagrams | Surface Concentrations | Columns

GEOS-CF USERS:
Important Dates for Transition to CF Version 2:
Monday, Nov. 24, 2025: GEOS-CF version 2 becomes default CF system
Monday, Dec. 1, 2025: GEOS-CF version 1 is deprioritized (replay available, forecast availability contingent on adequate computing resources)
Thursday, Jan. 1, 2026: GEOS-CF version 1 data no longer produced

To stay informed about important changes to GEOS-CF, subscribe to the geos-cf-users mailing list. Either contact Rob.Lucchesi@nasa.gov directly or send an email with 'subscribe' in in the subject to geos-cf-users-join@lists.nasa.gov and follow the instructions to confirm the subscription with a follow-up email. Thank you for your interest in GEOS-CF products.

Composition Forecast Products (GEOS-CF Version 2)

Datagrams Datagrams show the time evolution of various atmospheric constituents at a chosen location. A typical datagram will use multiple panels to visualize the evolution of the selected constituent(s) at the surface and above the location at multiple levels of the atmosphere. Meteorological fields such as clouds, moisture and temperature are also typically displayed. Time is displayed on the x-axis and may range from 5 to 10 days or longer
Technical Description
GMAO Latest Datagram Product
Surface Concentrations Surface concentrations represent the amount of a given constituent at or near the surface. It is typically derived from the lowest model level. Please see the 'Total Column' fields to assess the total amount of a given constituent throughout the atmosphere.
Technical Description
GMAO Latest Surface Concentration Map
Columns Total column fields represent the sum total of a given constituent throughout the atmosphere. It is derived by summing over all model layers from the surface to the top of the atmosphere (this is known as the 'column' at a given location). Use these fields to assess the total atmospheric content. Tropospheric column fields represent the sum of a given constituent from the surface to the tropopause.
Technical Description
GMAO Latest Total Column Map