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The page will be updated as required. It was last changed on 1421.05.2018.

For a record of changes made to this page please refer to  Document versions.

Further information and advice regarding the upgrade can be obtained from User Support.

Timetable for implementation

The planned timetable for the implementation of the IFS Cycle 45r1 is as follows:

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21.03.2018

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Expected date of implementation

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

Current Status

We have now entered the release candidate testing phase of IFS Cycle 45r1. HRES and ENS test data are available in dissemination.

Meteorological content of the new cycle

Assimilation

• Weakly coupled sea-ice atmosphere assimilation applied with the use of OCEAN5 sea-ice (instead of OSTIA) in the surface analysis of the high-resolution (HRES 4d-Var) and the ensemble of data assimilations (EDA) analyses;
• Relative humidity increments calculated using temperature instead of virtual temperature;
• Weak constraint model error forcing applied at every time step instead of every hour to avoid shocks in the model integration.

Observations

• Assimilation of non-surface-sensitive infra-red (IR) channels over land;
• Assimilation of all sky micro-wave (MW) sounding channels over coasts;
• Use of direct broadcast FY-3C MWHS2 data for better timeliness;
• Introduction of RTTOV-12 and new microwave instrument coefficients;
• Activation of constrained variational bias correction (VarBC);

• Retuning of the radiosonde observation error, and introduction of a scheme to account for radiosonde drift;

• Introduction of temperature bias correction of old-style AIREP observations; aircraft temperature varBC predictor upgraded to a three predictor model (cruise, ascent, descent); reduced thinning of aircraft data;

• Assimilation of JASON-3 and Sentinel-3A altimeters, and use of new altimeters for wave data assimilation;

Model

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Latest news!

21.05.2018

• Please note that the bathymetry (water depth) has changed with the IFS Cycle 45r1 . See below for more information. Apologies for this late notification.
• We have been informed about a change of value for the ecCodes key named timeRangeIndicator in the cycle 45r1 GRIB1 data at step 0 since the run of 18 April 2018 at 00Z. The cause of this change has been identified and is fixed for the 06Z BC run of 21 May 2018 onwards.
• The CAMS (Copernicus Atmosphere Monitoring Service) real-time data assimilation and forecasting system will be upgraded to IFS cycle 45r1 on 26 June 2018. More information can be found in the Implementation of IFS cycle 45R1_CAMS.

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Timetable for implementation

The planned timetable for the implementation of the IFS Cycle 45r1 is as follows:

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

Current Status

We have now entered the release candidate testing phase of IFS Cycle 45r1. HRES and ENS test data are available in dissemination.

Meteorological content of the new cycle

Assimilation

• Weakly coupled sea-ice atmosphere assimilation applied with the use of OCEAN5 sea-ice (instead of OSTIA) in the surface analysis of the high-resolution (HRES 4d-Var) and the ensemble of data assimilations (EDA) analyses;
• Relative humidity increments calculated using temperature instead of virtual temperature;
• Weak constraint model error forcing applied at every time step instead of every hour to avoid shocks in the model integration.

Observations

• Assimilation of non-surface-sensitive infra-red (IR) channels over land;
• Assimilation of all sky micro-wave (MW) sounding channels over coasts;
• Use of direct broadcast FY-3C MWHS2 data for better timeliness;
• Introduction of RTTOV-12 and new microwave instrument coefficients;
• Activation of constrained variational bias correction (VarBC);

• Retuning of the radiosonde observation error, and introduction of a scheme to account for radiosonde drift;

• Introduction of temperature bias correction of old-style AIREP observations; aircraft temperature varBC predictor upgraded to a three predictor model (cruise, ascent, descent); reduced thinning of aircraft data;

• Assimilation of JASON-3 and Sentinel-3A altimeters, and use of new altimeters for wave data assimilation;

Model

• Coupling of the 3-dimentional ocean and atmosphere: introduction of the coupling to the NEMO 3-dimentional ocean model also in the high-resolution forecast (HRES), with the same ocean model version used in the medium-range/monthly ensemble (ENS): NEMO3.4 in ORCA025_Z75 configuration; upgrade of the NEMO-IFS coupling strategy in both ENS and HRES to a full-coupling in the tropical region (partial-coupling-extra-tropics);
• Improved numerics for warm-rain cloud microphysics and vertical extrapolation for semi-lagrangian trajectory;
• Increased methane oxidation rate to improve (increase) water vapour in the stratosphere;
• Improved representation of super-cooled liquid water in convection, and minor convection updates;
• Improvements in the tangent forward and adjoint models linked to the convection scheme;
• Correction of soil thermal conductivity formulation and addition of soil ice dependency;
• New extended output parameters have been added. See below.
• Modified parameter for non-orographic gravity-wave drag scheme for 91 levels;
• Model error changes:
  • Stochastically perturbed parametrization tendency scheme (SPPT): improved flow-dependent error representation via reduced spread in clear skies regions (due to unperturbed radiative-tendency in clear sky), activation of tendency perturbations in stratosphere, and weaker tapering of perturbations in boundary layer; amplitude reduction of the SPPT perturbations patterns (by 20%);
  • EDA: cycling of stochastic physics random fields in the EDA, and adoption of the same SPPT configuration in EDA as in ENS;
  • Stochastic kinetic energy backscatter scheme (SKEB): deactivation of the stochastic backscatter (SKEB) scheme due to improved model error representation by the SPPT scheme (see above), leading to a 2.5% cost saving in the ENS;

HRES-WAM

ENS-WAM

This change was in part driven by users pointing out that the previous bathymetry for the Baltic Seawas quite erroneous at few places. Change in water depth will mostly affect the wave fields in coastal area, generally resulting in higher wave heights where the water has become deeper and vice-versa.. Moreover, some WAM grid points have changed from sea to land (i.e. no waves at those points),  and vice versa. These locations are respectively shown in the right figures above , with green and black shadings (you may need to zoom into the pictures). This change of land/sea points will be visible for some coastal locations in the Wave ENSgrams and for users relying exclusively on the wave model values at those locations.

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Meteorological impact of the new cycle

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The GRIB model identifiers (generating process identification number) for cycle 45r1 will be changed as follows:

New model output parameters

Extended output have been added in cycle 45r1, including precipitation rates, CAPE indices and a total lightning flash density.

paramId	Shortname	name	Description	units	GRIB edition	Component	Test data available	Dissemination	ecCharts	Proposed for Catalogue
228050	litoti	Instantaneous total lightning flash density	Instantaneous value of total (cloud-to-cloud and cloud-to-ground) lightning flash density	km-2 day-1	2	HRES / ENS			TBC
228051	litota1	Averaged total lightning flash density in the last hour	Averaged total (cloud-to-cloud and cloud-to-ground) lightning flash density in the last hour	km-2 day-1	2	HRES / ENS			TBC
228057	litota3	Averaged total lightning flash density in the last 3 hours	Averaged total (cloud-to-cloud and cloud-to-ground) lightning flash density in the last 3 hours	km-2 day-1	2	HRES / ENS			TBC
228058	litota6	Averaged total lightning flash density in the last 6 hours	Averaged total (cloud-to-cloud and cloud-to-ground) lightning flash density in the last 6 hours	km-2 day-1	2	HRES / ENS			TBC
260048	tprate	Total precipitation rate	Total precipitation rate (instantaneous)	kg m-2 s-1	2	HRES / ENS			TBC
228035	mxcape6	maximum CAPE in the last 6 hours	Maximum CAPE in the last 6 hours	J kg-1	2	HRES / ENS			TBC
228036	mxcapes6	maximum CAPES in the last 6 hours	Maximum CAPE-shear in the last 6 hours	m2 s-2	2	HRES / ENS			TBC
162071	viwve	Vertical integral of eastward water vapour flux	Vertical integral of eastward water vapour flux	kg m-1 s-1	1	HRES / ENS			TBC
162072	viwvn	Vertical integral of northward water vapour flux	Vertical integral of northward water vapour flux	kg m-1 s-1	1	HRES / ENS			TBC
151131	ocu	Ocean current zonal component	Ocean current zonal component	m s-1	1	HRES / ENS			TBC
151132	ocv	Ocean current meridional component	Ocean current meridional component	m s-1	1	HRES / ENS			TBC

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Graphical display of IFS cycle 45r1 test data using ecCharts

IFrom From the run of 9th of May 00UTC onwards, the IFS cycle 45r1 layers are available in ecCharts. Cycle 45r1 layers are identified by the label "0072" in their title.

Web charts based on IFS cycle 45r1 test data

Web charts, including ENS meteograms, based on IFS cycle 45r1 test data ENS meteograms based on IFS cycle 45r1 test data are available as of 16 May 2018 and can be viewed by selecting the "IFS cycle 45r1'model run in the ENS meteograms interface. Access to remaining web charts will shortly become available.

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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 45r1 test data by using the limited ECaccess 'events' set up for this purpose:

For these events, MSJ_EXPVER environment variable is set to 0072 and can be used to specify the IFS Cycle 45r1 test data in any MARS retrievals.

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