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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-09-23 06:00

iasi
METOP-B IASI RADIANCES CHANNEL 79 : out of range
24 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4220, expected range: 0.3158 0.3628
METOP-B IASI RADIANCES CHANNEL 83 : out of range
21 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.4293, expected range: 0.2950 0.3601
METOP-B IASI RADIANCES CHANNEL 66 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2778, expected range: 0.2993 0.3204
METOP-B IASI RADIANCES CHANNEL 111 : out of range
11 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2262, expected range: 0.2437 0.2645
METOP-B IASI RADIANCES CHANNEL 131 : out of range
24 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3238, expected range: 0.3592 0.3745
METOP-B IASI RADIANCES CHANNEL 133 : out of range
25 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2465, expected range: 0.2719 0.2839
METOP-B IASI RADIANCES CHANNEL 138 : out of range
20 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3400, expected range: 0.3736 0.4043
METOP-B IASI RADIANCES CHANNEL 386 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0209, expected range: 0.0774 0.1428
METOP-C IASI RADIANCES CHANNEL 79 : out of range
27 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.3591, expected range: 0.2862 0.3256
METOP-C IASI RADIANCES CHANNEL 386 : out of range
22 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=0.0156, expected range: 0.0862 0.0976
METOP-C IASI RADIANCES (26 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=0.2018, expected range: 0.2375 0.2591
cris
NPP CRIS RADIANCES (14 channels affected) : out of range
Considerable: avg_biascorr=0.2937, expected range: -0.1077 0.1272
airs
All AQUA AIRS ALL CHANNELS Global : all data missing
Severe: obs_number=0, expected range: 2966.11 7515.48
atms
NPP ATMS RADIANCES CHANNEL 9 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.6228, expected range: -0.4736 -0.4361
NOAA20 ATMS RADIANCES CHANNEL 8 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.7520, expected range: -0.6085 -0.6058
resat
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 1010-1011 (HPA) : out of range
31 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=2.8649, expected range: 1.1359 1.9796
METOP-B GOME-2 OZONE, TOP PRESSURE LAYER 12-13 (HPA) : out of range
15 times in the last 10 days for at least one item
Slight: obs_number=30230.0000, expected range: 15900.4576 24241.8471