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Atmospheric general circulation component

Table 1a: Key characteristics  of the atmospheric component of the IFS based on cycle 47r3

 

Forecast / Analysis

Number of members

Horizontal resolution

Vertical levels

Pressure at model top (hPa)

Perturbation models

HRES

Atmospheric Model high resolution

Forecast

  • 0–10 days

1

  •  Native (1): O1280 ~9km
  •  Interpolated (2): 0.1°  ~9km

137

0.01 hPa

No

ENS

Ensemble - Atmospheric Model

Forecast

  • 0–15 days
51

Day 0-15

  • Native (1): O640 ~18km
  • Interpolated (2):0.2°
1370.01 hPa

Yes (4)

ENS Extended

Atmospheric Model Extended forecast (monthly)

Forecast

  • 16–46 days
  • run twice a week
51
  • Native (1): O320 ~36km
  • Interpolated (2): 0.4°


137

0.01 hPaYes (4)

4DVAR

4-Dimensional data assimilation

Analysis

1

  •  N255/N319/N399/N399 inner loop minimisations
  • 4 outer loops at O1280 resolution


137


0.01 hPa

No

EDA

Ensemble of data assimilations

Analysis

51

  •  N191/N191 inner loop minimisations
  • 2 outer loops at O640 resolution 

137

0.01 hPa

Yes (5)

SEAS5 2017 version  Cycle 43r1

Seasonal forecast

Forecast

  • long-range forecast run monthly from 0 to 7 months
  • annual range forecast run quarterly from  0 to 13 months

51


15

  • Native (1):O320 ~36km
  • Interpolated (2): 0.4°

91

0.01 hPa

Yes (4)

Ensemble and Seasonal re-forecasts

Table 1b: Key characteristics of the ENS and SEAS re-forecasts of the ECMWF IFS

 

Forecast/Analysis

Number of members

Horizontal resolution

Vertical levels

Pressure at model top (hPa)

Perturbation models

Number of years

ENS

  • 0–46 days
  • run twice a week
11

Day 0-15

  • Native (1): O640
  • Interpolated (2): 0.25° ~28km

Day 16-46

  • Native (1): O320
  • Interpolated (2): 0.5° ~55km
1370.01 hPaYes (4)Most recent 20

SEAS5  Cycle 43r1

Seasonal forecast

Forecast

  • run monthly
  • 0–7 months (monthly)


  • run quarterly 0-13 months (annual range)


25


15

  • Native (1):O320 ~36km
  • Interpolated (2): 0.4°

91


0.01 hPaYes (4)36 (1981-2016)

Ocean general and sea ice

Table 1c: Key characteristics of the ocean component general circulation models of the ECMWF IFS

 

Forecast/Analysis

Number of members

Horizontal resolution

ORCA grid

Vertical levels

NEMO (LIM-2)

Forecast

  • daily (HRES and ENS)
  • run monthly
  • 0–7 months (monthly)
  • run quarterly 0-13 months (annual range)

51

0.25°

75

Oceans

  • OCEANS-BRT (Behind Real-Time)
  • OCEANS-RT (Real-Time)

Analysis

Reanalysis

5

0.25°

75

Ocean-wave component

Table 1d: Key characteristics of the ocean-wave component of the ECMWF IFS


Forecast/Analysis

Domain

Number of members

Horizontal resolution

HRES-WAM

Ocean Wave coupled to the atmospheric model

Analysis and forecast

  • 0–10 days


Global

1

  • Native: 0.125° reduced (3) ~14km
  • Interpolated (2): 0.125°~ 14km

ENS-WAM

Ensemble wave forecast

Forecast

  • 0-46 days

Global

51

0-15 days

  • Native: 0.25° reduced (3)  ~28km
  • Interpolated (2): 0.25° ~28km

16-46 days

  • Native: 0.5° reduced (3)  ~55km
  • Interpolated (2): 0.5° ~55km

SEAS-WAM

Seasonal wave forecast

Forecast

  • run monthly
  • 0–7 months (monthly)
  • run quarterly 0-13 months (annual range)

Global

51

  • Native: 0.5° reduced (3)  ~55km
  • Interpolated (2): 0.5° ~55km

Atmospheric and Ocean-wave reanalysis ERA5

ERA5, based on IFS Cycle 41r2, is used to initialise ensemble reforecasts. 


Forecast/Analysis

Number of members

Horizontal resolution

Vertical levels

Pressure at model top (hPa)

Perturbation models

ERA5 HRES

Atmospheric high resolution reanalysis

  • Analysis
  • Forecast


1
  • ~ 31km, 0.28125 degrees (at the equator)
  • Depending on the parameter, the data are archived either as spectral coefficients with a triangular truncation of T639 or on a reduced Gaussian grid with a resolution of N320.
1370.01No

ERA5 EDA

Atmospheric reduced resolution ensemble

  • Analysis
  • Forecast
10
  • ~ 63km, 0.5625 degrees (at the equator)
  • Depending on the parameter, the data are archived either as spectral coefficients with a triangular truncation of T319 or as N160 reduced Gaussian grid.
1370.01Yes (5)

ERA5 wave

Ocean wave model (WAM) reanalysis

  • Analysis
  • Forecast
1

0.36 degrees

1-No

ERA5 wave EDA

Ocean wave reduced resolution ensemble

  • Analysis
  • Forecast
101.0 degrees1-Yes (5)

 4D-Var data available for all the 4 entries.
 

(1) Native: as produced by the model on reduced Gaussian grids or spherical harmonics.

(2) Interpolated to lat/lon

(3) Native: as produced by the model on reduced lat/lon grids.

(4) in analysis and model physics

(5) in observations and model physics

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