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SISMER Systèmes d’Informations Scientifiques pour la Mer F-NODC

SISMER Systèmes d’Informations Scientifiques pour la Mer F-NODC. Quality Control Procedure at IFREMER Argo data management meeting Brest 03-05/10/2000. 2. 5. 9. 1. 3. 4. 0. No QC. Correct. Inconsistent. Changed. Missing. Doubtful. Bad. Quality Checks : Automatic + Visual.

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SISMER Systèmes d’Informations Scientifiques pour la Mer F-NODC

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  1. SISMERSystèmes d’Informations Scientifiques pour la MerF-NODC Quality Control Procedure at IFREMER Argo data management meeting Brest 03-05/10/2000

  2. 2 5 9 1 3 4 0 No QC Correct Inconsistent Changed Missing Doubtful Bad Quality Checks : Automatic + Visual QC0 : Format, Codes, Completeness of Information QC1 : Date, Time, Location, Duplicates QC2 : Data Points Result : Elimination or Quality Flag from GTSPP Scale References • UNESCO/COI/IODE : Manual of Quality Control Procedures for validation of Oceanographic Data - Manuals and Guides 26 - (GTSPP chapter) • ICES -GETADE Formatting Guidelines for Oceanographic Data Exchange (http://www.ices.dk/ocean/) • ICES -MDM QA Guidelines - CTD - Marine Data Management working Group (CIEM) Reports • UNESCO/IOC/IODE : GF3 A General Formatting System for Geo-Referenced Data - Manual and Guides 17 2

  3. QC0 - FORMATS, CODES, INFORMATION • Check of Meta-Data/Information : RDBS - ORACLE • Present Input Format for full QC : • autodescriptive ASCII (MEDATLAS) • NetCDF (in preparation) • Other input formats (Via conversion interfaces) 3

  4. Automatic Checks Results - Flag Duplicate data sets Elimination Date Elimination or 5 Ship/Platform velocity Elimination or 5 Location/shoreline Elimination or 5 Bottom sounding (ETOPO5) Elimination or3 5= Correction/Interpolation 3 = doubtfull depth QC1 Control of the location and Date - Data collected in station 4

  5. Automatic Checks Results/Flag Pressure record only Elimination Out of the regional scale4 (min & max values) Non Increasing pressure4 Data below the bottom depth4 Coherence with pre-existing statistics (LEVITUS, REYNAUD, MEDATLAS)2 Constant profiles 4 Spikes - Gradient 3 Vertical instability > noise 4 QC2 - Control of the Data points 5

  6. 0 200 2000 6000 QC2 - Control of the Data pointsMinimum & Maximum - Broad Range Check 6

  7. QC2 - Control of the Data pointsRegional Adjustment for Broad Range Checks 7

  8. QC2- Vertical Stability Check • Threshold noise for instability detection • 0.03 in sigma-t for high resolution deep water stations • 0.05 to 0.1 for coastal or low resolution stations • 4 data points to be checked : 2 levels T, S • Automatic seach for further anomaly • if any flag=4 at this point • if none flag=4 at the 4 points and manual decision 8

  9. QC2 - Spike and Gradient Checks • On 2 consecutive points at the top and bottom • On 3 consecutive points in between • Threshold for detection adjustable in geographical subregions and vertical layers 9

  10. QC2- Climatological Checks • Several available climatologies : Levitus 94, 98, Reynaud, Medatlas, MODB • Default Climatology is Levitus 98 1x1 degree • Allowed Variability • Shallow water stations bottom < 100 m : 5 standard deviations • Shelf Stations 200< bottom < 400 : 4 standard deviations • Deep Stations bottom > 400 m : 3 standard deviations 10

  11. Visual Checks • Check of the Internal Coherence • QC1 : Check of the route or trajectory • QC2 : Internal coherence of the values and search for shifts or gaps • Check of the External Coherence • QC1 : Display of all the profiles of another cruise/trajectory if at least one station is in the space/time vicinity • QC2 : Possibility of superposing the profiles made during another experiment in the same region • Removing Doubts • Vertical intabilities • Spikes • Climatological test (Erroneous climatological standard deviations) 11

  12. QC1 Control of the location and Date VISUAL CHECKS - Data collected in station 12

  13. QC1: Control of the location and Date - Time series on fixed mooring 13

  14. QC2 - Control of the Data pointsVisual Checks 14

  15. QC2 - Control of the Data pointsVisual Checks - case of problematic climatology 15

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