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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 resolution	Active Sea Ice
GEPS 7	02/12/2021	d 0-32	Yin-Yang grid at 0.35° uniform resolution (~39 km) / L85	20+1	weekly (Thu)	on the fly	2001-2020	weekly (Thu)	3+1	0.25 dg/ L50	yes
GEPS 6	04/07/2019	d 0-32	Yin-Yang grid at 0.35° uniform resolution (~39 km) / L45	20+1	weekly (Thu)	on the fly	1998-2017	weekly (Thu)	3+1	0.25 dg/ L50	yes
GEPS 5	20/09/2018	d 0-32	Yin-Yang grid at 0.35° uniform resolution (~39 km) / L45	20+1	weekly (Thu)	on the fly	1998-2017	weekly (Thu)	3+1	N/A	N/A
GEPS 4	07/01/2016	d 0-32	0.45x0.45 L40	20+1	weekly (Thu)	on the fly	1995-2014	weekly (Thu)	3+1	N/A	N/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 06 Feb 2020 onwards.

GEPS 7

operational from 02 Dec 2021
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 09 Dec 2021

GEPS 6

operational from 04 Jul 2019
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 20 Sept 2018
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 27 Sept 2018

GEPS 4

operational from 01 Jan 2016