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 Alerts are provided for information on an as-is basis and may be withdrawn or changed without notice.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 2022-06-29 06:00

amsua
METOP-B AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range 16 times in the last 10 days for at least one item Severely_persistent: avg_biascorr=0.0698, expected range: 0.1409 0.1800
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 12 : out of range 11 times in the last 10 days for at least one item Severely_persistent: avg_biascorr=-0.6468, expected range: -0.5729 -0.4787
METOP-C AMSUA ALL SKY RADIANCES CHANNEL 13 : out of range 12 times in the last 10 days for at least one item Severely_persistent: avg_biascorr=-0.4378, expected range: -0.3762 -0.3095
iasi
METOP-B IASI RADIANCES CHANNEL 89 : out of range 14 times in the last 10 days for at least one item Severely_persistent: avg_biascorr=-0.2862, expected range: -0.1739 -0.0986
METOP-B IASI RADIANCES CHANNEL 163 : out of range 11 times in the last 10 days for at least one item Severely_persistent: avg_biascorr=0.2408, expected range: 0.2605 0.2833 Slight: stdev_fgdepar=0.2805, expected range: 0.2479 0.2786
METOP-B IASI RADIANCES CHANNEL 170 : out of range 12 times in the last 10 days for at least one item Severely_persistent: avg_biascorr=0.1782, expected range: 0.2070 0.2327
METOP-C IASI RADIANCES CHANNEL 89 : out of range 9 times in the last 10 days for at least one item Severely_persistent: avg_biascorr=-0.3417, expected range: -0.2401 -0.1295
METOP-C IASI RADIANCES CHANNEL 144 : out of range 11 times in the last 10 days for at least one item Severely_persistent: avg_biascorr=0.1570, expected range: 0.1907 0.2160
METOP-C IASI RADIANCES CHANNEL 163 : out of range 12 times in the last 10 days for at least one item Severely_persistent: avg_biascorr=0.2118, expected range: 0.2374 0.2601
METOP-C IASI RADIANCES CHANNEL 183 : out of range 12 times in the last 10 days for at least one item Severely_persistent: avg_biascorr=0.1495, expected range: 0.1861 0.2118
METOP-C IASI RADIANCES CHANNEL 189 : out of range 9 times in the last 10 days for at least one item Severely_persistent: avg_biascorr=0.1191, expected range: 0.1539 0.1811
METOP-C IASI RADIANCES CHANNEL 195 : out of range 13 times in the last 10 days for at least one item Severely_persistent: avg_biascorr=0.0799, expected range: 0.1161 0.1311
METOP-B IASI RADIANCES CHANNEL 106 : out of range Slight: stdev_fgdepar=0.3163, expected range: 0.2766 0.3157
METOP-B IASI RADIANCES CHANNEL 131 : out of range Slight: stdev_fgdepar=0.2959, expected range: 0.2604 0.2941
METOP-B IASI RADIANCES CHANNEL 157 : out of range Slight: stdev_fgdepar=0.2856, expected range: 0.2484 0.2833
METOP-B IASI RADIANCES CHANNEL 183 : out of range Slight: stdev_fgdepar=0.2739, expected range: 0.2436 0.2728
METOP-B IASI RADIANCES CHANNEL 195 : out of range Slight: stdev_fgdepar=0.2733, expected range: 0.2426 0.2704
Atmospheric Motion Vector
NOAA-18 AVHRR IR WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range 13 times in the last 10 days for at least one item Severely_persistent: stdev_fgdepar=0.0000, expected range: 1.2827 1.8428
AQUA MODIS CLEAR WV WIND VECTOR DIFF (M/S) PRESSURE LAYER 0-300 (HPA) : out of range 14 times in the last 10 days for at least one item Severely_persistent: obs_number=31.0000, expected range: 0.0000 4.7974
Geostationary CSR
HIMAWARI-8 AHI RADIANCES CHANNEL 2 : out of range 23 times in the last 10 days for at least one item Severely_persistent: avg_biascorr=0.1870, expected range: 0.1135 0.1493
resat
AURA OMI OZONE, TOP PRESSURE LAYER 12-13 (HPA) : out of range 35 times in the last 10 days for at least one item Severely_persistent: obs_number=68.0000, expected range: 820.9343 1103.1403 Severely_persistent: avg_biascorr=-3.6540, expected range: -3.2928 -2.8375
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 25430-25431 (HPA) : out of range 37 times in the last 10 days for at least one item Severely_persistent: stdev_fgdepar=4.3987, expected range: 2.5952 2.9365
NOAA-19 SBUV OZONE, TOP (21 pressure layers affected) : out of range 37 times in the last 10 days for at least one item Severely_persistent: obs_number=124.0000, expected range: 65.0585 68.2921
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 100-101 (HPA) : out of range 36 times in the last 10 days for at least one item Severely_persistent: avg_fgdepar=0.2384, expected range: 0.1336 0.1512
NOAA-19 SBUV OZONE, TOP PRESSURE LAYER 640-641 (HPA) : out of range 39 times in the last 10 days for at least one item Severely_persistent: avg_fgdepar=-3.1874, expected range: -2.4521 -2.3111