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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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.

Ensemble Data Assimilation at 2021-01-09 12:00

amsua
METOP-C AMSUA RADIANCES CHANNEL 9 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2749, expected range: -0.3824 -0.3614
METOP-B AMSUA RADIANCES (10 channels affected) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=3482.0000, expected range: 7865.1505 18547.9083
iasi
METOP-A IASI RADIANCES CHANNEL 201 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0485, expected range: -0.0166 -0.0058
METOP-A IASI RADIANCES CHANNEL 207 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.3640, expected range: -0.3429 -0.3173
METOP-C IASI RADIANCES CHANNEL 195 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1416, expected range: 0.1746 0.1900
METOP-C IASI RADIANCES CHANNEL 201 : out of range
16 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0865, expected range: -0.0419 -0.0378
METOP-C IASI RADIANCES CHANNEL 214 : out of range
13 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.2362, expected range: -0.2133 -0.1971
METOP-C IASI RADIANCES CHANNEL 222 : out of range
15 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0422, expected range: -0.0274 -0.0182
cris
NOAA20 CRIS RADIANCES CHANNEL 1205 : out of range
2 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.3945, expected range: -0.2823 -0.1424
NOAA20 CRIS RADIANCES CHANNEL 84 : out of range
2 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.1290, expected range: 0.0612 0.1051
NOAA20 CRIS RADIANCES CHANNEL 1133 : out of range
1 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.4221, expected range: -0.3519 -0.2261
airs
All AQUA AIRS ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 4509.99 33586.43
mhs
METOP-A MHS ALLSKY RADIANCES CHANNEL 4 : out of range
25 times in the last 10 days for at least one item
Severely_persistent: stdev_norm_fgdepar=0.3374, expected range: 0.1244 0.1765
atms
NPP ATMS RADIANCES CHANNEL 11 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0402, expected range: -0.0647 -0.0380
NOAA20 ATMS RADIANCES CHANNEL 9 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.4552, expected range: -0.6027 -0.5761
ssmis
DMSP-18 SSMIS RADIANCES CHANNEL 10 : out of range
Severe: obs_number=5144.0000, expected range: 19512.1675 26026.8913
Severe: stdev_norm_fgdepar=0.5119, expected range: 0.6015 0.6834
DMSP-18 SSMIS RADIANCES CHANNEL 11 : out of range
Severe: obs_number=5159.0000, expected range: 19480.2606 26050.7982
Considerable: stdev_norm_fgdepar=0.6146, expected range: 0.6750 0.7629
DMSP-17 SSMIS RADIANCES (9 channels affected) : out of range
Considerable: obs_number=2950.0000, expected range: 9752.2660 24560.8043
DMSP-18 SSMIS RADIANCES CHANNEL 9 : out of range
1 times in the last 10 days for at least one item
Slight: stdev_norm_fgdepar=0.5129, expected range: 0.5354 0.6060
gpsro
All COSMIC-6 GPSRO SETTING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 1297.04
Atmospheric Motion Vector
AQUA MODIS IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : out of range
7 times in the last 10 days for at least one item
Severely_persistent: avg_press=561.0000, expected range: 349.0816 416.0419
NOAA20 VIIRS-AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA : out of range
6 times in the last 10 days for at least one item
Severely_persistent: avg_press=419.5690, expected range: 355.7297 381.7252
NPP VIIRS AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 300-600 (HPA) : out of range
4 times in the last 10 days for at least one item
Considerable: avg_press=427.4124, expected range: 339.6918 385.8701
HIMAWARI-8 AMV CLOUDY WV2 WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 : out of range
4 times in the last 10 days for at least one item
Considerable: obs_number=425.0000, expected range: 1249.8947 2830.4463