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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-10-04 12:00

iasi
METOP-B IASI RADIANCES CHANNEL 16 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.4239, expected range: 0.3600 0.3917
METOP-B IASI RADIANCES CHANNEL 74 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.3225, expected range: 0.2754 0.3023
METOP-B IASI RADIANCES CHANNEL 101 : out of range
10 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.2935, expected range: 0.2532 0.2717
METOP-B IASI RADIANCES CHANNEL 131 : out of range
24 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.2788, expected range: 0.2304 0.2533
METOP-B IASI RADIANCES CHANNEL 151 : out of range
22 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.2633, expected range: 0.2237 0.2435
METOP-B IASI RADIANCES CHANNEL 170 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.2546, expected range: 0.2195 0.2391
METOP-B IASI RADIANCES CHANNEL 189 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.2482, expected range: 0.2106 0.2318
METOP-B IASI RADIANCES CHANNEL 301 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.2542, expected range: 0.2117 0.2337
METOP-B IASI RADIANCES CHANNEL 303 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.2540, expected range: 0.2128 0.2325
METOP-B IASI RADIANCES CHANNEL 59 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.3286, expected range: 0.3650 0.3951
METOP-B IASI RADIANCES CHANNEL 79 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.3297, expected range: 0.3555 0.3831
METOP-B IASI RADIANCES CHANNEL 386 : out of range
38 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.0228, expected range: 0.0774 0.1284
METOP-C IASI RADIANCES CHANNEL 386 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_fgdepar=-0.0324, expected range: 0.0862 0.1161
METOP-C IASI RADIANCES (34 channels affected) : out of range
Severe: avg_biascorr=0.0295, expected range: 0.1093 0.1565
METOP-C IASI RADIANCES (24 channels affected) : out of range
Severe: stdev_fgdepar=0.3177, expected range: 0.3592 0.3658
atms
NPP ATMS RADIANCES CHANNEL 11 : out of range
22 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3285, expected range: -0.3057 -0.2821
NPP ATMS RADIANCES CHANNEL 12 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2747, expected range: -0.2117 -0.1660
NPP ATMS RADIANCES CHANNEL 9 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.5659, expected range: -0.4736 -0.4687
NOAA20 ATMS RADIANCES CHANNEL 12 : out of range
39 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3668, expected range: -0.3458 -0.3210
Severely_persistent: avg_biascorr=-0.3834, expected range: -0.3201 -0.2830
gpsro
All TERRASAR-X GPSRO SETTING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 14.23 847.24
All KOMPSAT-5 GPSRO SETTING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 0.00 786.85
Atmospheric Motion Vector
All GOES-17 AMV CLOUDY WV3 ALL LAYERS Global : all data missing
Severely_persistent: obs_number=0, expected range: 1428.11 4169.75
resat
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 1010-1011 (HPA) : out of range
28 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=2.7821, expected range: 1.2937 1.9796