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The planned timetable for the implementation of the cycle 50R1 is as follows:

Date	Event
late April 2025	Implementation

The timetable represents current expectations and may change in light of actual progress made.

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Technical details of the new cycle

New parameters

paramId	shortName	name	units	GRIB edition	Components
Model & Pressure levels
216013	MolBSC355	Molecular backscatter coefficient at 355 nm	m^-1 sr^-1	2	CAMS Aerosol Model
216014	MolBSC532	Molecular backscatter coefficient at 532 nm	m^-1 sr^-1	2	CAMS Aerosol Model
216015	MolBSC1064	Molecular backscatter coefficient at 1064 nm	m^-1 sr^-1	2	CAMS Aerosol Model
216023	MolBSC910	Molecular backscatter coefficient at 910 nm	m^-1 sr^-1	2	CAMS Aerosol Model
216016	AerBSC355	Aerosol backscatter coefficient at 355 nm	m^-1 sr^-1	2	CAMS Aerosol Model
216017	AerBSC532	Aerosol backscatter coefficient at 355 nm	m^-1 sr^-1	2	CAMS Aerosol Model
216018	AerBSC1064	Aerosol backscatter coefficient at 355 nm	m^-1 sr^-1	2	CAMS Aerosol Model
216024	AerBSC910	Aerosol backscatter coefficient at 355 nm	m^-1 sr^-1	2	CAMS Aerosol Model
216025	Aerext340	Aerosol extinction coefficient at 340 nm	m^-1	2	CAMS Aerosol Model
216026	Aerext440	Aerosol extinction coefficient at 440 nm	m^-1	2	CAMS Aerosol Model
216027	Aerext800	Aerosol extinction coefficient at 800 nm	m^-1	2	CAMS Aerosol Model
216019	Aerext910	Aerosol extinction coefficient at 910 nm	m^-1	2	CAMS Aerosol Model
216020	SSA910	Single Scattering Albedo at 910 nm		2	CAMS Aerosol Model
216022	Aerbcksctgnd910	Aerosol backscatter coefficient at 910 nm as seen from the ground	m^-1 sr^-1	2	CAMS Aerosol Model
216021	Aerbckscttoa910	Aerosol backscatter coefficient at 910 nm as seen from TOA	m^-1 sr^-1	2	CAMS Aerosol Model
Surface level
216033	trco3	Tropospheric column vertically-integrated mass density of ozone	kg m^-2	2	CAMS Chemical Model
216034	trcco	Tropospheric column vertically-integrated mass density of carbon monoxide	kg m^-2	2	CAMS Chemical Model
216035	trcno2	Tropospheric column vertically-integrated mass density of nitrogen dioxide	kg m^-2	2	CAMS Chemical Model

Note

Please note: 3 hourly analysis fields now available

With the implementation of the IFS Cycle 50r1 analysis fields will be available every 3 hours, at times 0 UTC, 3 UTC ... 18 UTC and 21 UTC.
(Previously, analysis fields were available only every 6 hours, at times 0 UTC, 6 UTC, 12 UTC and 18 UTC.)

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The GRIB model identifiers (generating process identification number) for cycle 50r1 will be changed as follows:

GRIB 1 Section 1 Octets	GRIB 2 Section 4 Octets	ecCodes key	Component	Model identifier
GRIB 1 Section 1 Octets	GRIB 2 Section 4 Octets	ecCodes key	Component	49r1	50r1
6	14	generatingProcessIdentifier	Atmospheric model	158	161
6	14	generatingProcessIdentifier	Ocean wave model	106	109
6	14	generatingProcessIdentifier	soil moisture model	146	146

For all parameters in GRIB 2 the Master Tables Version Number will be changed as follows:

GRIB 2

Section 1

Octets

ecCodes key

Master Tables Version Number

49r1

50r1

10

tablesVersion

33

35

Software

To handle the data of Cycle 50r1 we recommend to use the ECMWF software packages

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Old Version 5

New Version 6

Key

Technical details of the new cycle

New parameters

Please note: 3 hourly analysis fields now available

Software