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Comment: include data irregularities section

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Expand
titleData gaps table


Known issue numberCentreForecasts
or
Hindcasts		Start dates(1)Description
G1.

Met Office
(system=12)

Forecasts

20180102
20180103
20180104
20180105

No data is available.
G2.

Met Office
(system=12,13)

ForecastsNominal start dates previous to November 2018Monthly statistics and anomalies are just available for 50 members - specifically, the 50 members closest and previous or equal to the 1st of the nominal start month.
G3.

MetOffice
(system=12)


ForecastsNominal start dates from February to April 2018Parameter "Soil temperature at level 1" (GRIB/MARS paramId=139) is not available.
HindcastsNominal start dates from February to April

MetOffice
(system=13)

ForecastsNominal start dates from May to December 2018
HindcastsNominal start dates from May to December
G4.MetOffice
(all systems)		HindcastsNominal start date January 1993January 1993 data is not available.
MetOffice system produces hindcasts from January 1993 to December 2016, and due to the way nominal start dates are assigned, January 1993 would require data from December 1992 which are not produced by the MetOffice system.

G5.MetOffice
(system=600)		Forecasts20210222
20210223

No data is available.
An issue with assimilation of sea-ice data was reported by the MetOffice affecting forecasts initialised on 22 and 23 February 2021. Due to the potential impact of that wrong sea-ice initialisation throughout the forecast, those start dates haven't been processed by C3S.

Expand
titleMore details here

The GloSea6 forecasts initialised on 22 and 23 February were initialised with low Arctic sea ice extents. This resulted from corrupt data used in the derivation of ocean initial conditions. The sea ice largely recovers in these forecasts, but is biased low through the whole 6-month forecast compared to neighbouring days.

Initial sea-ice conditions for different GloSea6 February 2021 start dates:

Evolution of sea-ice fraction forecasts for different GloSea6 February 2021 start dates:


G6.JMA
(system=3)		Forecasts20220102 to
20220111		No data is available.
JMA CPS3 started its operational production at JMA on the 12th January 2022




Data irregularities

Expand
titleData irregularities table


Known issue numberCentreForecast or hindcastDescription
I1.MetOffice
(all systems)		Forecasts

MetOffice real-time component is designed to produce a constant number of members each start date (see Description of the C3S seasonal multi-system).

In those rare occasions when the MetOffice is not able to produce some of the expected members for a given start date, the affected members will be missing. Instead of re-running precisely those missing members, the MetOffice system schedules the run on a later start date of as many additional members as they were missing.

The following table records all the occurrences of this irregularity by listing the dates when some members are missing (and how many of them) and the dates when additional members were produced.

SystemMissing membersAdditional members 

Start date


Start date
12201708222201708232
13201806211201806281
13201810102201810112
600202102021202102041
600202106082202106141
202106151
600202111212202111232








Info
iconfalse
This document has been produced in the context of the Copernicus Climate Change Service (C3S).
The activities leading to these results have been contracted by the European Centre for Medium-Range Weather Forecasts, operator of C3S on behalf of the European Union (Delegation agreement signed on 11/11/2014). All information in this document is provided "as is" and no guarantee or warranty is given that the information is fit for any particular purpose.
The users thereof use the information at their sole risk and liability. For the avoidance of all doubt, the European Commission and the European Centre for Medium-Range Weather Forecasts have no liability in respect of this document, which is merely representing the author's view.

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