Detailed model description

Page containing details for all model configurations available in S2S since the project start => ECCC model description

Overview of the model changes

Model version

Implementation date in S2S

Time range

Resolution

Ens. Size

Frequency

Re-forecasts

Rfc period

Rfc frequency

Rfc size

Ocean resolutionActive Sea Ice

GEPS 8

13/06/2024 

d 0-39Yin-Yang grid at 0.25° uniform resolution (~25 km) L8520+1

2/week

(Mon, Thu)

on the fly2001-2020

2/week

(Mon, Thu)

3+10.25° L50yes

GEPS 7

02/12/2021 

d 0-32Yin-Yang grid at 0.35° uniform resolution (~39 km)  L8520+1

weekly

(Thu)

on the fly2001-2020

weekly

(Thu)

3+1 0.25 dg/ L50 yes

GEPS 6

04/07/2019d 0-32Yin-Yang grid at 0.35° uniform resolution (~39 km)  L4520+1

weekly

(Thu)

on the fly1998-2017

weekly

(Thu)

3+1 0.25° L50 yes
GEPS 520/09/2018d 0-32Yin-Yang grid at 0.35° uniform resolution (~39 km) L4520+1

weekly

(Thu)

on the fly1998-2017

weekly

(Thu)

3+1N/AN/A
GEPS 407/01/2016d 0-320.45x0.45 L4020+1

weekly

(Thu)

on the fly1995-2014

weekly

(Thu)

3+1N/AN/A

Description of the main changes

Ocean parameters

The 9 new ocean parameters from ECCC coupled model have been added to S2S archive for both real-time and on-the-fly reforecast  runs since   onwards. 

GEPS 8

  • operational from  
  • The version of the GEM model is upgraded to 5.2 with more advanced physics.
  • The atmospheric model horizontal resolution is increased from 39km to 25km.
  • The time range is extended from 32 days to 39 days.
  • The forecast frequency is increased from once per week (Thursday) to twice per week (Monday and Thursday)

GEPS 7

  • operational from
  • The version of the GEM model is upgraded to 5.1 with more advanced physics.
  • The number of vertical levels is increased from 81 to 85 for the data assimilation and from 45 to 85 for the forecast.
  • A Stochastic Parameter Perturbation (SPP) method is introduced to replace the Physics Tendency Perturbation (PTP).
  • 20 years hindcast period changed from 1997-2017 to 2001 to 2020 from  

GEPS 6

  • operational from
  • coupled to ocean model NEMO 3.6 at 0.25° horizontal resolution and 50 vertical levels
    • ECCC ocean analysis initialisation
    • no ocean initial perturbation
    • coupling frequency 15 minutes

GEPS 5

  • operational from
  • Yin-Yang grid
  • increased the horizontal  resolution from 50 to 39 km and the vertical one from 40 to 45 levels
  • 20 years hindcast period changed from 1995-2014 to 1998 to 2017 from  

GEPS 4

  • operational from