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         MISSION / VISION    |    About EMC


Upcoming Implementations:



Q1FY15 GSM v12.0.0 - released August 4th, 2014 - scheduled implementation November 2014

NOTE: In the coming two upgrades the term "GFS" will transition to "NEMS/GSM". The GSM (Global Spectral Model) is the forecast component of the larger GFS (Global Forecast System). As we transition into the NEMS superstructure, the GFS will more commonly be referred to as the GSM when discussing the forecast component. The Q1FY16 upgrade will be done within the NEMS, while the coming upgrade will still be within the GFS but listed as GSM in production. Future references to GFS should be understood to mean all components: pre-processing, analysis, forecast, post, etc.

  • Upgrade from current operational T574 Eulerian (~23km) to T1534 Semi-Lagrangian (~13km)
  • Use high resolution daily RGT SST instead of weekly OI SST, and use daily sea ice analysis
  • Extend high resolution forecast from 8 days to 10 days
  • Use McICA radiation approximation
  • Reduced drag coefficient at high wind speeds
  • Hybrid EDMF PBL scheme and TKE dissipative heating
  • Retuned ice and water cloud conversion rates, background diffusion of momentum and heat
  • Retuned orographic gravity-wave forcing and mountain block, etc.
  • Change from Lagrangian to Hermite interpolation in the vertical to reduce stratospheric temperature cold bias
  • Restructured physics and dynamics restart fields and updated sigio library
  • Consistent diagnosis of snow accumulation in post and model
  • Compute and output frozen precipitation fraction
  • Divergence damping in the stratosphere to reduce noise
  • Added a tracer fixer for maintaining global column ozone mass
  • Stationary convective gravity wave drag
  • New blended snow analysis to reduce reliance on AFWA snow
  • Changes to treatment of lake ice to remove unfrozen lake in winter
  • Modified initialization to reduce a sharp decrease in cloud water in the first model time step
  • Correct a bug in the condensation calculation after the digital filter is applied
  • Accumulation bucket changed from 12 hour to 6 hour between day 8 and day 10
  • Land Surface changes
    • Replace Bucket soil moisture climatology by CFS/GLDAS
    • Add the vegetation dependence to the ratio of the thermal and momentum roughness
    • Fixed a momentum roughness issue

Read the full release notes here for GSM v12.0.0

Also see GSI and EnKF release notes for upcoming implemention:
GSI v5.0.0
EnKF v2.0.1
Q1FY16 Global Model Upgrade (Click to read more)

Previous Implementations:



2012090512 Correction to Land Surface Model in Global Forecast System and associated cool and moist bias in near surface temperature and moisture fields (Click to read more)
2012052212 Hybrid EnKF - 3DVar GSI data assimilation (Click to read more)
2011050914 GFS 9.0.1 (Click to read more)
2010072712 T574 W/ NEW PHYSICS - July 27th 2010 (Click to read more)