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IQuOD An International Quality Control Effort

IQuOD An International Quality Control Effort. Tim Boyer EDM workshop September 10, 2014. Anuual mean global energy flow calculated from Mar. 2000 to May 2004. From Trenberth, Fasullo, and Kiehl (2009).

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IQuOD An International Quality Control Effort

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  1. IQuOD An International Quality Control Effort Tim Boyer EDM workshop September 10, 2014

  2. Anuual mean global energy flow calculated from Mar. 2000 to May 2004. From Trenberth, Fasullo, and Kiehl (2009)

  3. Changes in Earth’s Heat Balance Components (1022 J) During 1955-2003 (from Levitus, Antonov and Boyer, 2005, GRL) 83% or 0.75 W/m2

  4. How is Ocean Content Changing? How do we reliably estimate the change?

  5. World Ocean Database by Instrument Type

  6. 2009 Ocean Heat Content 0-700m Levitus (2012) method Using ENACT-3 Quality Control Using WOD Quality Control Red=heat gain (relative to long-term mean) Blue=heat loss (relative to long-term mean)

  7. NODC Information Stream Not Always Publicly Accessible NODC Permanent Archive [non-uniform Format] Delayed Mode Data World Ocean Database Additional QC Uniform format Data quality information Near Real-Time Availability GTSPP Argo/GODAE Buoys PMEL/JAM

  8. Data added to World Ocean Database since WOD13 Grey – Argo (184,348 cycles) Green – XBT (25,979 casts) Red – bottle/CTD (106,327casts) Blue - Pinniped (14,421 dives) Turquoise – Glider (42,142 half cycles) Orange – tropical buoys (41,832 daily means)

  9. Examples of Delayed-mode data Updates to WOD ICES CCHDO Blue – Quarterly Orange- Yearly Green - Irregular SECARGO IMOS gliders CalCOFI World Ocean Database Quarterly Updates NOAA Northeast Fisheries Japan Ocean Data Center INIDEP (Argentina) CSIRO Oil Industry

  10. Example of already aggregated data passed to WOD HOT WOCE BATS CLIVAR CDIAC CLIVAR and Carbon Hydrographic Data Office (CCHDO) GO-SHIP CARINA Other PACIFICA OceanSITES

  11. NODC Quality Control : Automatic Checks - reveal systematic errors in incoming data and metadata - eliminate most non-representative data from consideration Checks include: Range check Spike check Density inversion Speed check Standard deviation Eliminates ~6% of temperature data from Consideration (>800,000 profiles) Red – Unflagged Black – Flagged

  12. Inversion and Large Gradient Checks For Temperature: Inversion ≤ -0.3°C/meter Gradient ≥ 0.7°C/meter Inversions present In 276,000 temperature Profiles (2% of profiles) Large positive gradients Present in 534,000 Temperature profiles (4% of profiles) Depth (meters) °Celsius MBT with large inversion

  13. International Quality Controlled Oceanographic Profile Database (IQuOD) Standardize Automatic Quality Control Internationally Expert manual quality control all profiles which fail automatic checks For temperature (1), salinity (2), oxygen, nutrients Disseminate results to oceanographic/climate community

  14. Manual quality control: profile by profile Regional/instrument expertise

  15. IQuODInformation Stream IQuOD Manual QC Expert Center Original Data IQuOD QC Other QC project World Ocean Database IQuOD Automatic QC Uniform format IQuOD Manual QC NODC Permanent Archive

  16. INSIDE THE DATA World Ocean Database Internal Storage Generated on the fly Original Profile Data QC Flags (IQuOD) QC Flags (orig) Altered Profile Data (if necessary) QC Flags (WOD) QC Flags (2nd)

  17. Data Dissemination: Yearly by instrument Geographically by instrument WODselect All updated quarterly Format: Native WOD format (compact ASCII) with conversion routines netCDF -> feeds into NODC Geoportal/THREDDS server Working now on subset dissemination through Geoportal

  18. NODC to Public Information Stream (Profile Data) Public Access NODC Permanent Archive Geoportal/THREDDS WODselect World Ocean Database Additional QC Uniform format

  19. Ideal NODC to Public Information Stream (Profile Data) NODC Permanent Archive Public Access Geoportal/THREDDS WOD GTSPP Argo PMEL buoys

  20. Ideal NODC to Public Information Stream (in situ Data) NODC Permanent Archive Public Access Geoportal/THREDDS Coastal Buoy Profile Current Thermo salinograph

  21. Best Copy Get Data Information World Ocean Database Get Data Information GTSPP Get Data Information Argo Get Data Information Individual Accessions See all Information Consolidated Granule Level GeoPortal

  22. Summary • Uniformity in quality control of temperature data will benefit the oceanographic/climate community • IQuOD will establish internationally agreed set of automatic qc checks • IQuOD will establish groups of experts for manual qc • The World Ocean Database (WOD) will be the initial data source, aggregator and data disseminator for IQuOD • The IODE two tiered flagging system will be used by WOD • The NODC Geoportal will be the preferred means of dissemination for WOD/Aggregation with other data sources through the granule level tools.

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