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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2021-01-10 12:00

amsua
All AQUA AMSUA ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 8565.67 10824.08
NOAA-19 AMSUA RADIANCES (8 channels affected) : out of range
Considerable: obs_number=4693.0000, expected range: 4924.0703 5760.7532
iasi
METOP-A IASI RADIANCES CHANNEL 195 : out of range
8 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2138, expected range: 0.2354 0.2577
METOP-A IASI RADIANCES CHANNEL 201 : out of range
18 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=-0.0475, expected range: -0.0166 -0.0146
METOP-B IASI RADIANCES CHANNEL 201 : out of range
9 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.0353, expected range: 0.0546 0.0766
METOP-B IASI RADIANCES CHANNEL 187 : out of range
2 times in the last 10 days for at least one item
Considerable: avg_biascorr=-0.3307, expected range: -0.3136 -0.2833
cris
NOAA20 CRIS RADIANCES CHANNEL 1133 : out of range
3 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.4326, expected range: -0.3519 -0.2719
NOAA20 CRIS RADIANCES CHANNEL 1205 : out of range
4 times in the last 10 days for at least one item
Severe: avg_biascorr=-0.4014, expected range: -0.2823 -0.1897
NPP CRIS RADIANCES CHANNEL 84 : out of range
3 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.0792, expected range: 0.0169 0.0578
NOAA20 CRIS RADIANCES CHANNEL 84 : out of range
4 times in the last 10 days for at least one item
Considerable: avg_biascorr=0.1281, expected range: 0.0739 0.1051
airs
All AQUA AIRS ALL CHANNELS Global : all data missing
Severely_persistent: obs_number=0, expected range: 4509.99 33617.49
mhs
METOP-A MHS ALLSKY RADIANCES CHANNEL 3 : out of range
30 times in the last 10 days for at least one item
Severely_persistent: avg_norm_fgdepar=0.0699, expected range: -0.0244 0.0288
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=0.4024, expected range: 0.1618 0.1765
NOAA-19 MHS ALLSKY RADIANCES CHANNEL 4 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=9812.0000, expected range: 10780.5996 11777.7533
NOAA-19 MHS ALLSKY RADIANCES CHANNEL 5 : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=9197.0000, expected range: 10122.1664 10988.8924
gpsro
All COSMIC-6 GPSRO SETTING ALL HEIGHTS Global : all data missing
Severely_persistent: obs_number=0, expected range: 0.00 1297.04
All COSMIC2-E6 GPSRO RISING ALL HEIGHTS Global : all data missing
Severe: obs_number=0, expected range: 674.80 2884.38
COSMIC2-E3 GPSRO SETTING (12 impact heights affected) : out of range
Considerable: obs_number=2130.0000, expected range: 2483.7204 3794.6325
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=549.7143, expected range: 347.0072 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=420.3426, expected range: 355.7001 381.7252
GOES-17 AMV VIS1 WIND VECTOR DIFF (M/S) PRESSURE LAYER 600-900 (HPA) : out of range
Considerable: obs_number=435.0000, expected range: 612.4863 799.7958