seNorge operational QC settings

[cristianlussana]

Parameters used for automatic quality control in the seNorge_2018 real-time production chain. The dataset description is here: seNorge_2018. For further insights into the number of observations and their spatial distribution, refer to the scientific article: Lussana, C., Tveito, O. E., Dobler, A., and Tunheim, K. (2019): seNorge_2018: daily precipitation and temperature datasets over Norway, Earth Syst. Sci. Data, 11, 1531–1551, https://doi.org/10.5194/essd-11-1531-2019.

Note

The automatic quality control was implemented using a prototype version of Titanlib. As a result, there is no direct one-to-one correspondence between the input parameters of that version and the current Titanlib parameters. Nevertheless, the procedures employed are quite similar to those available in the current version of Titanlib. Therefore, the reported values remain useful as reference points for applications with a similar spatial distribution of observations.

Metadata check
Elevation (min/max, units m amsl): 0/2500

Daily Mean Temperature

• Range check (min/max, °C): -55/50 # this check is redundant, given the next one
• Range check for each month (Jan to Dec min/max, °C): -50/20,-50/20,-40/25,-35/25,-20/35,-15/35,-10/40,-15/40,-15/35,-20/30,-35/25,-50/20
• Buddy Check:
  • Vertical Profile Adjustment: VerticalProfileTheilSen
  • Threshold: 7
  • Radius of the circular neighborhood considered: between 80 km and 125 km
  • Minimum number of observations required: 7
• Spatial Consistency Test (Resistant version):
  • Procedure used to compute Vertical Profiles: VerticalProfileTheilSen
  • Inner radius: 80 km
  • Outer Radius: 125 km
  • Minimum number of observation required in the Outer circle: 7
  • Maximum number of observation required in the Outer circle: 100
  • Threshold (tpos/tneg): 5
  • Error variance ration (eps2) = 0.5
  • Minimum elevation difference required to compute vertical profile: 50 m
  • Minimum number of observation needed to compute a vertical profile: 5
  • Maximum value for the horizontal decorrelation length scale of the correlation function: 500 km
  • Minimum value for the horizontal decorrelation length scale of the correlation function: 500 m
  • Adaptive determination of the horizontal decorrelation length scale based on the k-th nearest observation, with k: 20
  • Vertical decorrelation length scale: 530 m
  • No data transformation
  • Range of valid values (used to optimize computer time): 0.5°C
  • Range of admissible values (used to optimize computer time): 15°C

Daily Maximum Temperature

• Range check (min/max, °C): -50/45 # this check is redundant, given the next one
• Range check for each month (Jan to Dec min/max, °C): -45/20,-45/25,-40/30,-35/35,-20/35,-15/40,-10/40,-15/40,-15/35,-20/30,-35/25,-45/20
• Buddy Check:
  • Vertical Profile Adjustment: VerticalProfileTheilSen
  • Threshold: 7
  • Radius of the circular neighborhood considered: between 80 km and 125 km
  • Minimum number of observations required: 7
• Spatial Consistency Test (Resistant version):
  • Procedure used to compute Vertical Profiles: VerticalProfileTheilSen
  • Inner radius: 80 km
  • Outer Radius: 125 km
  • Minimum number of observation required in the Outer circle: 7
  • Maximum number of observation required in the Outer circle: 100
  • Threshold (tpos/tneg): 8
  • Error variance ration (eps2) = 0.5
  • Minimum elevation difference required to compute vertical profile: 50 m
  • Minimum number of observation needed to compute a vertical profile: 5
  • Maximum value for the horizontal decorrelation length scale of the correlation function: 500 km
  • Minimum value for the horizontal decorrelation length scale of the correlation function: 500 m
  • Adaptive determination of the horizontal decorrelation length scale based on the k-th nearest observation, with k: 20
  • Vertical decorrelation length scale: 530 m
  • No data transformation
  • Range of valid values (used to optimize computer time): 0.5°C
  • Range of admissible values (used to optimize computer time): 15°C

Daily Minimum Temperature

• Range check (min/max, °C): -65/40 # this check is redundant, given the next one
• Range check for each month (Jan to Dec min/max, °C): -55/20,-55/20,-50/25,-35/25,-30/35,-20/35,-15/40,-15/40,-20/35,-40/30,-45/25,-55/20
• Buddy Check:
  • Vertical Profile Adjustment: VerticalProfileTheilSen
  • Threshold: 7
  • Radius of the circular neighborhood considered: between 80 km and 125 km
  • Minimum number of observations required: 7
• Spatial Consistency Test (Resistant version):
  • Procedure used to compute Vertical Profiles: VerticalProfileTheilSen
  • Inner radius: 80 km
  • Outer Radius: 125 km
  • Minimum number of observation required in the Outer circle: 7
  • Maximum number of observation required in the Outer circle: 100
  • Threshold (tpos/tneg): 8
  • Error variance ration (eps2) = 0.5
  • Minimum elevation difference required to compute vertical profile: 50 m
  • Minimum number of observation needed to compute a vertical profile: 5
  • Maximum value for the horizontal decorrelation length scale of the correlation function: 500 km
  • Minimum value for the horizontal decorrelation length scale of the correlation function: 500 m
  • Adaptive determination of the horizontal decorrelation length scale based on the k-th nearest observation, with k: 20
  • Vertical decorrelation length scale: 530 m
  • No data transformation
  • Range of valid values (used to optimize computer time): 0.5°C
  • Range of admissible values (used to optimize computer time): 15°C

Daily Precipitation Totals
We have implemented a procedure to account for the wind-induced undercatch of precipitation by rain gauges, as documented in the scientific article mentioned above.

• Range check (min/max, mm/day): 0/250
• Buddy Check:
  • Data are transformed with a Box-Cox with 0.5 as parameter
  • Radius of the circular neighborhood considered: between 80 km and 125 km
  • Reference value considered as the average in the circular neighborhood is the Median
  • Threshold: 30
  • Minimum number of observations required: 7
• Spatial Consistency Test (Resistant version):
  • Data are transformed with a Box-Cox with 0.5 as parameter
  • Inner radius: 80 km
  • Outer Radius: 125 km
  • Reference value considered as the average in the circular neighborhood is the Median
  • Minimum number of observation required in the Outer circle: 7
  • Maximum number of observation required in the Outer circle: 100
  • Threshold (tpos/tneg): 20
  • Error variance ration (eps2) = 0.1
  • Maximum value for the horizontal decorrelation length scale of the correlation function: 500 km
  • Minimum value for the horizontal decorrelation length scale of the correlation function: 500 m
  • Adaptive determination of the horizontal decorrelation length scale based on the k-th nearest observation, with k: 15
  • Vertical decorrelation length scale: None
• Spatial Consistency Test based on event occurrence (Dual SCT):
  • Inner radius: 80 km
  • Outer Radius: 125 km
  • Minimum number of observation required in the Outer circle: 7
  • Maximum number of observation required in the Outer circle: 100
  • Condition used to define the event occurrence (i.e. yes precipitation): >= 1 mm/day
  • Threshold used to decide if the observation should be flagged as suspect: 0.5
  • Error variance ration (eps2) = 0.1
  • Maximum value for the horizontal decorrelation length scale of the correlation function: 500 km
  • Minimum value for the horizontal decorrelation length scale of the correlation function: 500 m
  • Adaptive determination of the horizontal decorrelation length scale based on the k-th nearest observation, with k: 15
  • Vertical decorrelation length scale: None