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1. Context.The concept of "nominal" start date in lagged start ensembles
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Due to a number of reasons, members from ensembles using the "lagged start" approach are bundled together at C3S and labelled with a "nominal" start date (see details here).
The C3S seasonal forecast datasets are based on GRIB files stored at ECMWF MARS archive where that "nominal" start date is used to index the monthly data (monthly statistics and monthly post-processed products like anomalies). Hence, the details about the original initialization date could get lost in those files. Nonetheless, the data at daily and sub-daily time frequencies is always encoded with the real initialization date, as it can be seen in the example below:
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> grib_ls -p origin,type,shortName,number,indexingDate,indexingTime,dataDate,dataTime,step,fcmonth,verifyingMonth c3s_seas_ncep199312_t2m.grib c3s_seas_ncep199312_t2m.grib origin type shortName number indexingDate indexingTime dataDate dataTime step fcmonth verifyingMonth kwbc fcmean 2t 0 19931201 0 19931127 0 840 1 199312 kwbc fcmean 2t 1 19931201 0 19931127 6 840 1 199312 kwbc fcmean 2t 2 19931201 0 19931127 12 840 1 199312 kwbc fcmean 2t 3 19931201 0 19931127 18 840 1 199312 kwbc fcmean 2t 4 19931201 0 19931122 0 960 1 199312 kwbc fcmean 2t 5 19931201 0 19931122 6 960 1 199312 kwbc fcmean 2t 6 19931201 0 19931122 12 960 1 199312 kwbc fcmean 2t 7 19931201 0 19931122 18 960 1 199312 kwbc fcmean 2t 8 19931201 0 19931117 0 1080 1 199312 kwbc fcmean 2t 9 19931201 0 19931117 6 1080 1 199312 kwbc fcmean 2t 10 19931201 0 19931117 12 1080 1 199312 kwbc fcmean 2t 11 19931201 0 19931117 18 1080 1 199312 kwbc fcmean 2t 12 19931201 0 19931112 0 1200 1 199312 kwbc fcmean 2t 13 19931201 0 19931112 6 1200 1 199312 kwbc fcmean 2t 14 19931201 0 19931112 12 1200 1 199312 kwbc fcmean 2t 15 19931201 0 19931112 18 1200 1 199312 kwbc fcmean 2t 16 19931201 0 19931107 0 1320 1 199312 kwbc fcmean 2t 17 19931201 0 19931107 6 1320 1 199312 kwbc fcmean 2t 18 19931201 0 19931107 12 1320 1 199312 kwbc fcmean 2t 19 19931201 0 19931107 18 1320 1 199312 kwbc fcmean 2t 20 19931201 0 19931102 0 1440 1 199312 kwbc fcmean 2t 21 19931201 0 19931102 6 1440 1 199312 kwbc fcmean 2t 22 19931201 0 19931102 12 1440 1 199312 kwbc fcmean 2t 23 19931201 0 19931102 18 1440 1 199312 kwbc fcmean 2t 0 19931201 0 19931127 0 1584 2 199401 kwbc fcmean 2t 1 19931201 0 19931127 6 1584 2 199401 kwbc fcmean 2t 2 19931201 0 19931127 12 1584 2 199401 kwbc fcmean 2t 3 19931201 0 19931127 18 1584 2 199401 kwbc fcmean 2t 4 19931201 0 19931122 0 1704 2 199401 kwbc fcmean 2t 5 19931201 0 19931122 6 1704 2 199401 kwbc fcmean 2t 6 19931201 0 19931122 12 1704 2 199401 kwbc fcmean 2t 7 19931201 0 19931122 18 1704 2 199401 kwbc fcmean 2t 8 19931201 0 19931117 0 1824 2 199401 kwbc fcmean 2t 9 19931201 0 19931117 6 1824 2 199401 kwbc fcmean 2t 10 19931201 0 19931117 12 1824 2 199401 kwbc fcmean 2t 11 19931201 0 19931117 18 1824 2 199401 kwbc fcmean 2t 12 19931201 0 19931112 0 1944 2 199401 kwbc fcmean 2t 13 19931201 0 19931112 6 1944 2 199401 kwbc fcmean 2t 14 19931201 0 19931112 12 1944 2 199401 kwbc fcmean 2t 15 19931201 0 19931112 18 1944 2 199401 kwbc fcmean 2t 16 19931201 0 19931107 0 2064 2 199401 kwbc fcmean 2t 17 19931201 0 19931107 6 2064 2 199401 kwbc fcmean 2t 18 19931201 0 19931107 12 2064 2 199401 kwbc fcmean 2t 19 19931201 0 19931107 18 2064 2 199401 kwbc fcmean 2t 20 19931201 0 19931102 0 2184 2 199401 kwbc fcmean 2t 21 19931201 0 19931102 6 2184 2 199401 kwbc fcmean 2t 22 19931201 0 19931102 12 2184 2 199401 kwbc fcmean 2t 23 19931201 0 19931102 18 2184 2 199401 |
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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. |