#newfcsystem
Description of upgrade
IFS Cycle 43r1 is an upgrade with many scientific contributions, including changes in data assimilation (both in the EDA and the 4DVAR); in the use of observations; and in modelling.
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The planned timetable for the implementation of IFS cycle 43r1 is as follows:
| Date | Event |
|---|---|
| 22 Sep 2016 | Initial announcement to Member States |
| Week beginning 17 Oct 2016 | Availability of test data in dissemination |
| 22 Nov 2016 | Expected date of implementation |
The timetable represents current expectations and may change in light of actual progress made.
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The medium-range ensemble and its monthly extension see a major upgrade in the dynamical ocean model. The main changes are summarised in the table.
| Old | New | |
|---|---|---|
| Ocean model version | NEMO v3.4.1 | NEMO v3.4.1 |
| Configuration | ORCA1Z42 | ORCA025Z75 |
Horizontal resolution | 1.0° | 0.25° |
| Vertical layers | 42 | 75 |
| Time step | 3600s | 1200s |
| Initial conditions | ORAS4 using NEMO v3.0 | ORAS5 using NEMO v3.4.1 |
| Sea-ice coupling | None | LIM2 |
ORAS5 complements the current ocean reanalysis system (ORAS4) until there is no longer need for the ORAS4 output.
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The GRIB model identifiers (generating process identification number) for the new cycle will be changed as follows:
| GRIB 1 Section 1 Octets | GRIB 2 Section 4 Octets | grib_api key | Component | Model ID | |
|---|---|---|---|---|---|
| Old | New | ||||
| 6 | 14 | generatingProcessIdentifier | Atmospheric model | 146 | 147 |
| Ocean wave model | 111 | 112 | |||
| HRES stand-alone ocean wave model | 211 | TBC | |||
Software
EMOSLIB
EMOSLIB 433 is needed to interpolate successfully the wave energy flux mean direction (wefxd) parameter introduced at IFS cy43r1.
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