Operational Data Checking

An automatic data checking system has been implemented at ECMWF to trigger warnings in case of anomalies affecting the quality or the availability of the data assimilated by the model. Selected statistical parameters (number of observations, bias correction, and mean bias-corrected background, analysis departures and probability of gross error) are checked against an expected range. An appropriate alert message (including a time series plot) is generated if statistics are outside the specified ranges. A severity level (slight, considerable, severe) is assigned to each message depending on how far statistics are from the expected values. Two kinds of ranges are used by the automatic checking: Soft and Hard limits. Soft limits are updated automatically using statistics from the last twenty days (extremes are excluded during this process). Hard limits are adjusted manually when required.

Currently, the automatic checking is limited to data passing through the minimisation process (including VarBC passive data). It's being applied twice a day to the delayed cut-off 4D-VAR cycles (00 and 12) and four times a day to the early delivery assimilation system (00,06,12 and 18).

The alarm system results are based on feedback information from the ECMWF data assimilation and consequently reflect the ECMWF data usage. Although most warnings are related to data problems, they may on occasion also be related to model issues. Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice. ECMWF accepts no responsibility for actions taken on the basis of these results.

Early delivery 4D-VAR at 2022-08-12 00:00

cris
NOAA20 CRIS RADIANCES CHANNEL 989 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0478, expected range: 0.0564 0.0639
NOAA20 CRIS RADIANCES CHANNEL 1005 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0735, expected range: 0.1014 0.1064
NOAA20 CRIS RADIANCES CHANNEL 62 : out of range
28 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2034, expected range: 0.2233 0.2401
NOAA20 CRIS RADIANCES CHANNEL 118 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2281, expected range: -0.1545 -0.1353
airs
AQUA AIRS RADIANCES CHANNEL 672 : out of range
4 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.0554, expected range: 0.0605 0.0685
gpsro
All TERRASAR-X GPSRO SETTING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 51.47 750.30
SPIRE LEMUR 3U GPSRO SETTING (24 impact heights affected) : out of range
Slight: obs_number=2352.0000, expected range: 1344.3501 2054.4378
Atmospheric Motion Vector
NOAA-18 AVHRR IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
7 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.3573, expected range: 1.2827 1.8428
resat
AURA OMI OZONE, TOP PRESSURE LAYER 12-13 (HPA) : out of range
50 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-2.9180, expected range: -1.9682 -1.3228
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 1010-1011 (HPA) : out of range
37 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=2.6577, expected range: 1.5301 1.9796
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 40-41 (HPA) : out of range
48 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0855, expected range: 0.0294 0.0582
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 60-61 (HPA) : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0605, expected range: -0.0245 -0.0183
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 1-2 (HPA) : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.0053, expected range: -0.0030 -0.0024