Information about implementation of ECMWF upgrade March 2016 to 9-km (HRES) and 18-km (EPS).
Timetable for implementation
The planned timetable for the implementation of IFS cycle 41r2 is as follows:
4 Nov 2015 Initial announcement to Member States and other customers
early Dec 2015 Availability of test data in dissemination
end Mar 2016 Expected date of implementation
ECMWF plans to upgrade the horizontal resolution of its analyses and forecasts.The upgrade will have a horizontal resolution that translates to about 9 km for HRES and the data assimilation (the outer loop of the 4D-Var) and to about 18 km for the ENS up to day 10.
A new cycle of the IFS will be introduced to implement the horizontal resolution upgrade. This cycle is labelled 41r2, and includes a number of enhancements to the model and data assimilation llisted herein. The detailed specification of the resolution upgrades included in IFS cycle 41r2 are:
Horizontal resolution of the HRES increased from TL1279 / N640 to TCO1279 / O1280, where subscript CO stands for cubic octahedral;
Horizontal resolution of the ENS increased from TL639 / N320 to TCO639 / O640 for Leg A (to day 10) and from TL319 / N160 to TCO319 / O320 for Leg B;
Introduction of a new form of the reduced Gaussian grid, the octahedral grid, for both HRES and ENS;
Increase of the HRES wave resolution from 0.25 to 0.125 degrees and the ensemble wave from 0.5 to 0.25 degrees;
Horizontal resolution of the EDA outer loop is increased from TL399 to TCO639 with the inner loops increased from TL159 / TL159 to TL191 / TL191, respectively;
Horizontal resolution of the 4DVar inner loops is increased from TL255 / TL255 / TL255 to TL255 / TL319 / TL399, respectively.
These upgrades
do not include any increase in the vertical resolution;
do not apply to the ECMWF seasonal forecasting system;
do not apply to the standalone wave model (HRES-SAW);
do apply to products from the Boundary Condition Optional Programme.
The timetable represents current expectations and may change in light of actual progress made.
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