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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-10-26 00:00

iasi
METOP-B IASI RADIANCES CHANNEL 286 : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=2551.0000, expected range: 1999.9059 2337.0314
METOP-B IASI RADIANCES CHANNEL 316 : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=1988.0000, expected range: 1562.8055 1897.1945
METOP-B IASI RADIANCES CHANNEL 323 : out of range
3 times in the last 10 days for at least one item
Considerable: obs_number=2444.0000, expected range: 1967.3677 2222.6323
METOP-B IASI RADIANCES CHANNEL 354 : out of range
Considerable: obs_number=3110.0000, expected range: 2460.1704 2977.6088
METOP-B IASI RADIANCES CHANNEL 389 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=2227.0000, expected range: 1731.3491 2101.6786
METOP-B IASI RADIANCES CHANNEL 921 : out of range
2 times in the last 10 days for at least one item
Considerable: obs_number=1296.0000, expected range: 985.3551 1233.8449
cris
NOAA20 CRIS RADIANCES (27 channels affected) : out of range
Severe: obs_number=2481.0000, expected range: 2189.5873 2281.2127
NOAA20 CRIS RADIANCES CHANNEL 64 : out of range
Slight: stdev_fgdepar=0.1168, expected range: 0.0943 0.1123
mwhs2
FY-3D MWHS2 ALLSKY RADIANCES (11 channels affected) : out of range
Severe: obs_number=43093.0000, expected range: 54533.4955 56442.0045
atms
NPP ATMS RADIANCES CHANNEL 21 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2023, expected range: 0.1501 0.1757
NPP ATMS RADIANCES CHANNEL 15 : out of range
7 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.8323, expected range: 0.6289 0.7315
NPP ATMS RADIANCES CHANNEL 19 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.1416, expected range: 0.1089 0.1133
NOAA20 ATMS RADIANCES CHANNEL 15 : out of range
5 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=0.7843, expected range: 0.5538 0.6636
Severely_persistent: stdev_fgdepar=0.7674, expected range: 0.5174 0.6480
NOAA20 ATMS RADIANCES CHANNEL 19 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.1184, expected range: -0.1584 -0.1489
gpsro
COSMIC2-E2 GPSRO RISING HEIGHT 40-42 KM : out of range
Slight: avg_norm_fgdepar=0.2159, expected range: -0.1143 0.1330
Atmospheric Motion Vector
NPP VIIRS AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
2 times in the last 10 days for at least one item
Considerable: stdev_fgdepar=2.4819, expected range: 1.7730 2.1654
Slight: avg_press=252.8219, expected range: 267.0431 283.8212
NOAA20 VIIRS-AMV IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
2 times in the last 10 days for at least one item
Slight: avg_press=252.7021, expected range: 266.0048 285.3083
mwri
FY-3D MWRI RADIANCES (6 channels affected) : out of range
Considerable: obs_number=8832.0000, expected range: 13337.3045 16026.0705