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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2019-09-09 00:00

amsua
METOP-A/AMSUA RADIANCES (10 channels affected) : out of range
1 times in the last 10 days for at least one item
Slight: obs_number=3787.0000, expected range: 5107.8745 16123.4033
iasi
METOP-A/IASI RADIANCES CHANNEL 131 : out of range
14 times in the last 10 days for at least one item
Severely_persistent: avg_biascorr=0.2348, expected range: 0.2801 0.3642
METOP-C/IASI RADIANCES CHANNEL 6458 : out of range
12 times in the last 10 days for at least one item
Severely_persistent: stdev_fgdepar=2.2724, expected range: 3.3805 5.2626
METOP-B/IASI RADIANCES (44 channels affected) : out of range
Severe: avg_biascorr=0.6796, expected range: -0.1278 0.3851
METOP-C/IASI RADIANCES (47 channels affected) : out of range
Severe: avg_biascorr=0.7011, expected range: -0.1962 0.3561
cris
NPP/CRIS RADIANCES CHANNEL 749 : out of range
65 times in the last 10 days for at least one item
Severely_persistent: obs_number=6223.0000, expected range: 0.0000 204.1484
NPP/CRIS RADIANCES CHANNEL 845 : out of range
19 times in the last 10 days for at least one item
Severely_persistent: obs_number=5955.0000, expected range: 0.0000 525.1684
NPP/CRIS RADIANCES CHANNEL 1085 : out of range
56 times in the last 10 days for at least one item
Severely_persistent: obs_number=20447.0000, expected range: 0.0000 447.2227
NPP/CRIS RADIANCES CHANNEL 1173 : out of range
17 times in the last 10 days for at least one item
Severely_persistent: obs_number=21211.0000, expected range: 0.0000 7041.9806
mhs
ALLSKY NOAA-19/MHS RADIANCES (5 channels affected) : out of range
2 times in the last 10 days for at least one item
Severe: obs_number=12346.0000, expected range: 25264.8169 33725.5516
ssmis
DMSP-18/SSMIS RADIANCES CHANNEL 4 : out of range
3 times in the last 10 days for at least one item
Severe: stdev_norm_fgdepar=0.0113, expected range: 0.0122 0.0136
DMSP-18/SSMIS RADIANCES CHANNEL 5 : out of range
3 times in the last 10 days for at least one item
Severe: stdev_norm_fgdepar=0.0111, expected range: 0.0121 0.0136
DMSP-18/SSMIS RADIANCES CHANNEL 3 : out of range
1 times in the last 10 days for at least one item
Slight: obs_number=9957.0000, expected range: 3210.0736 9301.1385
Atmospheric Motion Vector
All NOAA-19/AVHRR IR WIND VECTOR DIFF (M/S) ALL LAYERS Global : all data missing
Severe: obs_number=0, expected range: 0.00 775.54
Radiosondes
HIGH RESO LAND TEMP TEMPERATURE (K) (2 pressure layers affected) : out of range
4 times in the last 10 days for at least one item
Severe: avg_biascorr=0.1171, expected range: 0.0518 0.0842
HIGH RESO LAND TEMP TEMPERATURE (K) (4 pressure layers affected) : out of range
Severe: obs_number=409.0000, expected range: 547.1622 633.5437
HIGH RESO LAND TEMP Q (G/KG) (4 pressure layers affected) : out of range
1 times in the last 10 days for at least one item
Severe: obs_number=290.0000, expected range: 373.4216 473.2450
All HIGH RESO SEA TEMP TEMPERATURE (K) ALL LAYERS North West Pacific : all data missing
Severe: obs_number=0, expected range: 155.33 307.40
amdar
AMDAR TEMPERATURE (K) PRESSURE LAYER 600-900 (HPA) : missing
4 times in the last 10 days for at least one item
Severe: obs_number=0.0000, expected range: 0.0000 221.9550
All WIGOS AMDAR Q (G/KG) ALL LAYERS Tropics : all data missing
Severe: obs_number=0, expected range: 0.00 168.69
prof
EUROPEAN WIND PROFILER VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range
1 times in the last 10 days for at least one item
Considerable: obs_number=633.0000, expected range: 822.2350 1573.0591
synop
MANUAL LAND SYNOP SURFACE PRESSURE (PA) : out of range
Severe: avg_biascorr=-2.4000, expected range: 0.0000 0.0000
AUTOMATIC LAND SYNOP SURFACE PRESSURE (PA) : out of range
4 times in the last 10 days for at least one item
Considerable: obs_number=57.0000, expected range: 63.1473 76.2644
buoy
DRIFTING BUOYS SURFACE PRESSURE (PA) : out of range
2 times in the last 10 days for at least one item
Slight: obs_number=8681.0000, expected range: 8950.6076 10187.4480