Page History

The CMA global ensemble prediction system was upgraded on 26 December, 2018. The first updated CMA outputs for TIGGE archive have been ingested only since 1 June 2020.

The main changes in this upgrade are:

• The forecast model system is changed from TL639 L60 to GRAPES_GFS, correspondingly, the horizontal resolution is changed to 50km, and the model top is changed to 3hPa.
• The initial perturbation method is changed from Bred Vector to Singular Vector.
• The SKEB is introduced in the model perturbations.
• The ensemble size is changed from 15 to 31.

Full details are available in the page Models.

The horizontal resolution of the ECCC contribution to TIGGE has been increased from 1.0 to 0.25 degree since 12Z 14 Apr 2021 Also the GRIB 2 packing has been changed to simple instead of complex one (that will generally  increase file sizes but also  significantly reduce time needed to process such data).

The ECCC global ensemble prediction system was upgraded to version 2.0.2 on 17 August 2011.

The main changes included in this upgrade are:

• The number of members in the ensemble Kalman filter is doubled from 96 to 192.
• The resolution of the medium-range forecasts is changed from 100 to 66 km.
• The model top is raised from 10 hPa to 2 hPa.
• A new dynamical model, with a Charney-Phillips vertical grid, is used.

Further documentation of the operational upgrade can be found at http://collaboration.cmc.ec.gc.ca/cmc/CMOI/product_guide/docs/changes_e.html

The ECMWF forecast system IFS was upgraded to the version 47r1.

This cycle includes changes in the treatment of observations and improvements in the data assimilation and to the model. Quintic vertical interpolation in the semi-Lagrangian advection scheme has been introduced as well as the inclusion of a better surface albedo climatology making use of more data from the MODIS instrument.

New Metrics of Tropical Cyclone (TC) “size” will supplement the existing forecasts of TC track and intensity.

Full details can be found in Implementation of IFS Cycle 47r1 page.

The resolution of one-week ensemble prediction model of JMA was upgraded on 21 November 2007.

Major changes are:

• Increase in the resolution from TL159L40 to TL319L60 with a topmost level raised from 0.4hPa to 0.1hPa.
• Use of a new high-resolution analysis of sea surface temperature and sea ice concentration as ocean surface boundary conditions.
• Use of surface snow depth data from the domestic dense observational network in the global snow depth analysis.
• Introduction of a convective triggering scheme into the deep convection parameterization.
• Introduction of a new 2-dimensional aerosol climatology derived from satellite observations for the radiation calculation.
• Increase in the resolution of inner loop model of the four-dimensional variational (4D-Var) data assimilation system from T106L40 to T159L60.
• Introduction of a sigular vector method to make the initial perturbations.

Notes:

• The resolution and parameters of TIGGE data from JMA remains unchanged.
• Orography and Land Sea Mask in TIGGE data are slightly different from the previous data associated with the model change.

UM upgraded to version PS38 from 6UTC cycle on 8 November 2016.

The changes include predominantly a satellite applications package to include more satellite channels, re-tuned observation error estimates and better quality control of observations. This is expected to improve the headline NWP index scores by about +0.5 to +1.0 against analyses, observations, and independent ECMWF analyses.

Satellite package includes:

• Improved use of infrared and microwave satellite data over land, providing more temperature information at lower levels.
• Improved global humidity forecasts, due to more weight being given to satellite humidity information in our analysis.
• Incorporation of more Chinese polar orbiting satellite data, following our initial introduction in March 2016.
• The introduction of data from a new Japanese Geostationary satellite, Himawari-8.