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The planned timetable for the implementation of IFS cycle 41r2 is as follows:
| Date | Event |
|---|---|
| 4 Nov 2015 | Initial announcement to Member States and other forecast users |
| 8 Dec 2015 | Availability of test data in dissemination |
| 14 Jan 2016 | Test data in dissemination available at upgraded resolution |
| 9 Feb 2016 | Update of default software versions at ECMWF |
| 8 Mar 2016 | Expected date of implementation |
The timetable represents current expectations and may change in light of actual progress made.
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Comparison of scores between IFS cycle 42r1 41r2 and IFS cycle 41r1 for HRES and ENS can be found in the IFS cycle 41r2 scorecard.
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The figures below show the grid spacing and orography fields in a cylindrical projection for HRES, ENS and ENS Extended comparing old (41r1, left) and new (41r2, right) resolutions over a region covering the Alps (43.0°S to 49.0°N, 4.5°E to 17.0°E).
HRES
| Old: N640 original reduced Gaussian grid (~16 km resolution) | New: O1280 octahedral reduced Gaussian grid (~9 km resolution) |
|---|---|
ENS
| Old Day 0 - 10: N320 original reduced Gaussian grid (~32 km resolution) | New Day 0 - 15: O640 octahedral reduced Gaussian grid (~18 km resolution) |
|---|---|
| Old Day 11 - 46 : N160 original reduced Gaussian grid (~64 km resolution) | New Day 16 - 46: O320 octahedral reduced Gaussian grid (~36 km resolution) |
| Note |
|---|
The octahedral reduced Gaussian grid has a slightly lower resolution than the corresponding original reduced Gaussian grid with the same number of latitude lines. For example, the O640 grid has a resolution of ~18 km whereas the resolution of the N640 grid is ~16 km. |
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The increase in horizontal resolution for HRES and ENS is reflected in changes to the GRIB headers. For the model reduced Gaussian grid these are documented in the table below.
| GRIB 1 Section 2 Octets | GRIB 2 Section 3 Octets | grib_api key | HRES | ENS | ENS Extended | |||
|---|---|---|---|---|---|---|---|---|
| Old | New | Old (Day 0 - 10) | New (Day 0 - 15) | Old (Day 11 - 46) | New (Day 16 - 46) | |||
| 9-10 | 35-38 | Nj | 1280 | 2560 | 640 | 1280 | 320 | 640 |
| 11-13 | 47-50 | latitudeOfFirstGridPointInDegrees | 89.892 | 89.946 | 89.784 | 89.892 | 89.570 | 89.784 |
| 18-20 | 56-59 | latitudeOfLastGridPointInDegrees | -89.892 | -89.946 | -89.784 | -89.892 | -89.570 | -89.784 |
| 21-23 | 60-63 | longitudeOfLastGridPointInDegrees | 359.859 | 359.929 | 359.718 | 359.860 | 359.437 | 359.722 |
| 26-27 | 6-7 | N | 640 | 1280 | 320 | 640 | 160 | 320 |
| 33-nn | 35-nn | pl | N640 | O1280 | N320 | O640 | N160 | O320 |
Model identifiers
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 | 145 | 146 |
| Ocean wave model | 111 | 111 | |||
| HRES stand-alone ocean wave model | 211 | 211 | |||
| Note | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Note that the identifiers for the wave models have not changed. The identifiers have also not been updated for a a number of HRES analysis products arising from the surface analysis:
The identifiers for these 6 surface analysis parameters will be updated to 146 during the week beginning 14 March 2016. |
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An additional diagnostic for freezing rain accumulation during the forecast is introduced. CAPE-Shear, previously introduced for the EFI, will be provided also for the HRES and ENS. A new wave product will also be introduced. The availability of test data for these new parameters is indicated in the table below will be updated as the products become available.
| paramId | shortName | name | units | GRIB edition | Component | Test data availabe | Dissemination | Proposed for Catalogue |
|---|---|---|---|---|---|---|---|---|
| 228216 | fzra | Accumulated freezing rain | m | 1 | HRES / ENS |  |  | TBC |
| 228044 | capes | Convective available potential energy shear | m2/s2 | 1 | HRES / ENS |  | TBC | TBC |
| 140120 | sh10 | Significant wave height of all waves with period larger than 10s | m | 1 | HRES-WAM / ENS-WAM / HRES-SAW | | TBC | TBC |
Correction to solar zenith angle for the sunshine duration diagnostic
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Not all grid names and grid number combinations are supported. MARS requests specifying an unsupported grid will fail. Currently, the Gaussian grid names and numbers supported for MARS retrievals are:
| Octahedral reduced Gaussian (O grids) | O1280 | O640 | O512 | O400 | O320 | O256 | O200 | O160 | O128 | O96 | O64 | O48 | O32 |
| Original reduced Gaussian (N grids) | N640 | N512 | N400 | N320 | N256 | N200 | N160 | N128 | N96 | N64 | N48 | N32 | |
| Regular (Full) Gaussian (F grids) | F1280 | F640 | F512 | F400 | F320 | F256 | F200 | F160 | F128 | F96 | F64 | F48 | F32 |
For example, a retrieval request with GRID=N1280 or GRID=O124 will return an error.
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New octahedral grid based products can be requested by specifying GRID=O1280, etc.The following grid numbers are supported for all Gaussian grid names - full (F-grids), original reduced (N-grids) and octahedral reduced (O-grids) :
| HRES | 1280 | 640 | 400 | 256 | 200 | 160 | 128 | 80 | 48 | 32 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ENS (Days 0 - 15) | 640 | 320 | 200 | 160 | 128 | 80 | 48 | 32 | |||
| ENS-Extended (Days 16 - 46) | 320 | 200 | 160 | 128 | 80 | 48 | 32 |
As before, any sub-area of the global field is supported
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Member State users of the "Simple time-critical jobs" framework can test that their scripts will work with the IFS cycle 41r2 test data by using the special 'events' set up for this purpose:
| identifier | Name | Description |
|---|---|---|
| 1490 | e_ms090 | At this stage, the e-suite step 090 (HRES-BC) has been generated. |
| 1491 | e_ms144 | At this stage, the e-suite step 144 (ENS-BC) has been generated. |
| 1492 | e_ms240 | At this stage, the e-suite step 240 (HRES) has been generated. |
| 1493 | e_ms360 | At this stage, the e-suite step 360 (ENS) has been generated. |
| 1494 | e_mslaw | At this stage, the e-suite step law (HRES-SAW) has been generated. |
| 1495 | e_ms1104 | At this stage, the e-suite step refc (REFORECAST) has been updated. |
For these events, MSJ_EXPVER environment variable is set to 0069 and can be used to specify the IFS cycle 41r2 test data any MARS retrievals.
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IFS cycle 41r2 test data is accessible via the ecCharts layers menu, identified by the label "esuite 0069" as shown in the screenshot on the left. They can be displayed as any other layers of ecCharts, and they can be saved in the Dashboard, as seen in the screenshot on the right.
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| Anchor | ||||
|---|---|---|---|---|
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| Date | Reason for update |
|---|---|
| 4 November 2015 |
|
| 8 December 2015 |
|
| 14 January 2016 |
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| 10 February 2016 |
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| 10 March 2016 |
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| 8 April 2016 |
|