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IFS Cycle 41r1 was implemented successfully in operations on Tuesday 12 May 2015. The first run of the new cycle was for the 12 UTC main analysis and forecast runs. The monthly forecast extension to the ensemble was run with the new IFS cycle for the first time on Thursday 14 May 2015.
In this document
| Table of Contents |
|---|
- Meteorological changes
- Meteorological impact
- Technical aspects
- Model output
- User impact
- Timetable of implementation
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- The following parameters are obsolete.
| ParamId | ShortName | LongName | Note |
|---|---|---|---|
| 173128 | SR | Surface roughness | Use forecast surface roughness - FSR (244128) |
| 234128 | LSRH | Logarithm of surface roughness length for heat |
|
The surface roughness fields SR and LSRH should no longer be used (they have not been upgraded to the new climate resolution). Users of surface roughness should instead use the forecast field (FSR).
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The GRIB packing accuracy of the new climate fields used as input to the model has been increased from 16 to 24 bits per value. As a consequence, the following analysis fields required for initial conditions have an increased GRIB packing accuracy of 24 bits per value.
| paramId | shortName | name |
|---|---|---|
| 26 | cl | Lake cover (new at cycle 41r1) |
| 27 | cvl | Low vegetation cover |
| 28 | cvh | High vegetation cover |
| 43 | slt | Soil type |
| 74 | sdfor | Standard deviation of filtered subgrid orography |
| 129 | z | Geopotential |
| 141 | sd | Snow depth (already 24 bits at cycle 40r1) |
| 160 | sdor | Standard deviation of orography |
| 161 | isor | Anisotropy of sub-gridscale orography |
| 162 | anor | Angle of sub-gridscale orography |
| 163 | slor | Slope of sub-gridscale orography |
| 172 | lsm | Land-sea mask |
| 174 | al | Albedo |
| 228007 | dl | Lake depth (new at cycle 41r1) |
The accuracy of the corresponding forecast parameters in the FDB, archived in MARS and in dissemination is not changed.
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Table of new parameters introduced at IFS cycle 41r1
| paramId | shortName | name | GRIB edition | Component | Notes | Proposed for Catalogue |
|---|---|---|---|---|---|---|
| 26 | cl | Lake Cover | 1 | HRES | Invariant |  |
| 228007 | dl | Lake depth | 1 | HRES | Invariant | |
| 228008 | lmlt | Lake mix-layer temperature | 1 | HRES, ENS | | |
| 228009 | lmld | Lake mix-layer depth | 1 | HRES, ENS | | |
| 228010 | lblt | Lake bottom temperature | 1 | HRES, ENS | | |
| 228011 | ltlt | Lake total layer temperature | 1 | HRES, ENS | | |
| 228012 | lshf | Lake shape factor | 1 | HRES, ENS | | |
| 228013 | lict | Lake ice temperature | 1 | HRES, ENS | | |
| 228014 | licd | Lake ice depth | 1 | HRES, ENS | | |
| 228217 | ilspf | Instantaneous large-scale surface precipitation fraction | 1 | HRES, ENS | | |
| 228218 | crr | Convective rain rate | 1 | HRES, ENS | | |
| 228219 | lsrr | Large scale rain rate | 1 | HRES, ENS | | |
| 228220 | csfr | Convective snowfall rate water equivalent | 1 | HRES, ENS | | |
| 228221 | lssfr | Large scale snowfall rate water equivalent | 1 | HRES, ENS | | |
| 228222 | mxtpr3 | Maximum total precipitation rate in the last 3 hours | 1 | HRES, ENS | | |
| 228223 | mntpr3 | Minimum total precipitation rate in the last 3 hours | 1 | HRES, ENS | | |
| 228224 | mxtpr6 | Maximum total precipitation rate in the last 6 hours | 1 | HRES, ENS | | |
| 228225 | mntpr6 | Minimum total precipitation rate in the last 6 hours | 1 | HRES, ENS | | |
| 228226 | mxtpr | Maximum total precipitation rate since previous post-processing | 1 | HRES, ENS |  | |
| 228227 | mntpr | Minimum total precipitation rate since previous post-processing | 1 | HRES, ENS | | |
| 228029 | i10fg | Instantaneous 10m wind gust | 1 | HRES, ENS | | |
| 228088 | tcslw | Total column supercooled liquid water | 1 | HRES | | |
| 228251 | pev | Potential evaporation | 1 | HRES, ENS | | |
| 260015 | ptype | Precipitation type | 2 | HRES, ENS | GRIB 2, Index: 1=rain 3=freezing rain | |
| 003020 | vis | Visibility | 1 | HRES, ENS | Experimental | |
| 57 | uvb | Downward UV radiation at the surface | 1 | ENS | | |
| 206 | tco3 | Total column ozone | 1 | ENS | | |
| 203 | o3 | Ozone mass mixing ratio | 1 | ENS | On pressure levels | |
| 140121 | swh1 | Significant wave height of first swell partition | 1 | WAM-HRES, WAM-ENS,WAM-LAM | | |
| 140122 | mwd1 | Mean wave direction of first swell partition | 1 | WAM-HRES, WAM-ENS,WAM-LAM | | |
| 140123 | mwp1 | Mean wave period of first swell partition | 1 | WAM-HRES, WAM-ENS,WAM-LAM | | |
| 140124 | swh2 | Significant wave height of second swell partition | 1 | WAM-HRES, WAM-ENS,WAM-LAM | | |
| 140125 | mwd2 | Mean wave direction of second swell partition | 1 | WAM-HRES, WAM-ENS,WAM-LAM | | |
| 140126 | mwp2 | Mean wave period of second swell partition | 1 | WAM-HRES, WAM-ENS,WAM-LAM | | |
| 140127 | swh3 | Significant wave height of third swell partition | 1 | WAM-HRES, WAM-ENS,WAM-LAM | | |
| 140128 | mwd3 | Mean wave direction of third swell partition | 1 | WAM-HRES, WAM-ENS,WAM-LAM | | |
| 140129 | mwp3 | Mean wave period of third swell partition | 1 | WAM-HRES, WAM-ENS,WAM-LAM | | |
| 140207 | wss | Wave Spectral Skewness | 1 | WAM-HRES, WAM-ENS,WAM-LAM | |
The inclusion of a significant number of the new parameters in the Catalogue of ECMWF real-time products was approved by the Advisory Committee on Data Policy in April 2015 as indicated in the table. The inclusion of wave parameters and the extension to 46 days of the monthly forecast will be discussed in the coming months.
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Timetable for implementation
Date | Event |
|---|---|
| 13 Mar 2015 | Initial announcement to Member States |
| 16 Mar 2015 | Availability of test data in dissemination |
| 12 May 2015 | Implementation date |
19 May 2015
IFS Cycle 41r1 implemented a revised set of forecast output fields for the ocean waves. These were based on a new method to split the 2d ocean wave spectrum into its principal components. The new scheme splits the wave spectrum into one wind waves and up to three swell partitions. The parameters characterising the three swell partitions (significant height, mean wave direction and mean wave period of first, second and third swell partitions) are new, supplementing the total swell parameters already produced.
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