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(follow the model version links below for more details)

changes include increased ocean model resolution to 1/4 degree and active sea-ice
operational since 22/11/2016 (included)

changes include extension of re-forecast ensemble size to 11 twice-weekly and forecast length to 46 days
operational from 14/05/2015 (included) to 8/03/2016 (excluded)

Model version	Implementation Date in S2S	Time range	Atmosphere Resolution	Ens. Size	Frequency	Re-forecasts	Rfc length	Time range Atmosphere Resolution	Rfc size	Ocean Resolution	Active Sea Ice
CY47R1	30/06/2020	d 0-46	16 km up to day 15 31 km after day 15	51	2/week (Mon/Thu)	on the fly	past 20 years	2/week (Mon/Thu)	11	1/4 degree	Yes
CY46R1	11/06/2019	d 0-46	16 km up to day 15 31 km after day 15	51	2/week (Mon/Thu)	on the fly	past 20 years	2/week (Mon/Thu)	11	1/4 degree	Yes
CY45R1	06/06/2018	d 0-46	16 km up to day 15 31 km after day 15	51	2/week (Mon/Thu)	on the fly	past 20 years	2/week (Mon/Thu)	11	1/4 degree	Yes
CY43R3	11/07/2017	d 0-46	16 km up to day 15 31 km after day 15	51	2/week (Mon/Thu)	on the fly	past 20 years	2/week (Mon/Thu)	11	1/4 degree	Yes
CY43R1	22/11/2016	d 0-46	16 km up to day 15 31 km after day 15	51	2/week (Mon/Thu)	on the fly	past 20 years	2/week (Mon/Thu)	11	1/4 degree	Yes
CY41R2	08/03/2016	d 0-46	16 km up to day 15 31 km after day 15	51	2/week (Mon/Thu)	on the fly	past 20 years	2/week (Mon/Thu)	11	1 degree	No
CY41R1	14/05/2015	d 0-46	32 km up to day 10 64 km after day 10	51	2/week Mon/Thu	on the fly	past 20 years	2/week (Mon/Thu)	11	1 degree	No
CY40R1	01/01/2015	d 0-32		51	2/week (Mon/Thu)	on the fly	past 20 years	once a week (Thu)	5	1 degree	No

The text in red indicates changes to the model configuration (in addition to model physics) introduced with a new version of the ECMWF model