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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-08-13 18:00

iasi
METOP-B IASI RADIANCES CHANNEL 258 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0872, expected range: -0.1035 -0.0966
METOP-B IASI RADIANCES CHANNEL 1639 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1591, expected range: -0.1017 -0.0768
METOP-B IASI RADIANCES CHANNEL 1658 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0006, expected range: 0.0620 0.0716
METOP-C IASI RADIANCES CHANNEL 1652 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0380, expected range: -0.0090 0.0227
METOP-C IASI RADIANCES CHANNEL 1658 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0011, expected range: 0.0399 0.0501
cris
All NPP CRIS ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 6048.60 9042.45
NOAA20 CRIS RADIANCES CHANNEL 963 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0797, expected range: -0.0651 -0.0526
NOAA20 CRIS RADIANCES CHANNEL 965 : out of range
37 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2803, expected range: -0.2549 -0.2315
NOAA20 CRIS RADIANCES CHANNEL 989 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0274, expected range: 0.0564 0.0682
NOAA20 CRIS RADIANCES CHANNEL 993 : out of range
28 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2208, expected range: 0.2439 0.2582
NOAA20 CRIS RADIANCES CHANNEL 1005 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0747, expected range: 0.1014 0.1041
NOAA20 CRIS RADIANCES CHANNEL 62 : out of range
33 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2029, expected range: 0.2233 0.2367
NOAA20 CRIS RADIANCES CHANNEL 118 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2448, expected range: -0.1545 -0.1122
NOAA20 CRIS RADIANCES CHANNEL 140 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3177, expected range: -0.2885 -0.2534
gmi
All GPM GMI ALSKY ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 4461.10 7274.68
atms
All NPP ATMS ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 3744.96 8890.04
gpsro
All KOMPSAT-5 GPSRO SETTING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 29.85 589.02
Atmospheric Motion Vector
All NPP VIIRS AMV IR ALL LAYERS Global : all data missing
Severely_persistent: obs_number=0, expected range: 612.85 1623.03
scatt
All HY-2B SCATTEROMETER Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 130657.72
resat
AURA OMI OZONE, TOP PRESSURE LAYER 12-13 (HPA) : out of range
35 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-1.7434, expected range: -3.8933 -2.6772
Severely_persistent: avg_biascorr=-4.6710, expected range: -3.9705 -3.7230
NOAA-19 SBUV OZONE, TOP (21 pressure layers affected) : out of range
38 times in the last 10 days for at least one item
Severely_persistent: obs_number=31.0000, expected range: 50.8555 51.2745