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GODAE Quality Control Pilot Project

GODAE Quality Control Pilot Project. Status Report - June, 2008 Final IGST Meeting Washington, D.C. James Cummings Naval Research Laboratory Outline Data Sources Output File Structure and Reference Data Plans and Issues. GODAE QC Pilot Project: Data Providers. UKMO

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GODAE Quality Control Pilot Project

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  1. GODAE Quality Control Pilot Project Status Report - June, 2008 Final IGST Meeting Washington, D.C. James Cummings Naval Research Laboratory Outline • Data Sources • Output File Structure and Reference Data • Plans and Issues

  2. GODAE QC Pilot Project: Data Providers • UKMO • January 2003 to present, real-time push to USGODAE server • BMRC • 2005 and 2006 only, one time only push to USGODAE server • MEDS • June 2004 to present, real-time push to USGODAE server • Coriolis • January 2004 to present, pull to USGODAE server: /ifremer/coriolis/mercator at ftp.ifremer.fr • CO_BA, CO_CT, CO_MO, CO_PF, CO_TE, CO_XB • FNMOC • March 2003 to present, real-time push to USGODAE server

  3. GODAE QC Pilot Project: Call Sign Databases • QC results from centers separated by call sign • profile match ups based on call sign, location and observation time • database contains observed values and supplemental information to understand QC decisions • provides history of real-time QC decisions made on a platform over the lifetime of the platform • call sign database format is NetCDF • based on Coriolis multiple profile NetCDF file structure • easily expanded with new QC variables or new data providers • sorted by observation time and then data center for ease of use • starting point for follow-on analysis and intercomparison of QC outcomes

  4. FNMOC MEDS UKMO Coriolis BMRC GODAE QC Application Program Interface (API) read various QC data formats, check for valid call sign, match profiles (lat, lon, time, call sign), populate database structure with observation, QC codes, QC flags, and supplemental information, resolve QC conflicts, sort by observation time, update NetCDF call sign database 1900305.nc Argo Float A8ES9.nc Ship XBT 52007.nc TAO Mooring Call Sign NetCDF Databases

  5. GODAE QC Pilot Project: Database Variables

  6. GODAE QC Pilot Project: Reference Data • Analysis/Forecast backgrounds UKMO: FOAM forecast profile FNMOC: NCODA analysis profile (persistence forecast) • Climatology FNMOC: Navy GDEM temperature and salinity climatology BMRC: WOA or CARS temperature and salinity climatology • QC Conflict Variables – entire profile and level-by-level • simple scheme to indicate differences of QC outcomes among centers 0 – profile (level) accepted (or rejected) by all centers 1 – profile (level) temperature QC outcomes differ 2 – profile (level) salinity QC outcomes differ 3 – profile (level) temperature and salinity QC outcomes differ

  7. GODAE QC Pilot Project: Plans and Issues Plans: initialize call sign databases with 2003-2008 production run • missing complete set of BMRC QC data files – Gary? • host call sign data files on USGODAE server • install GODAE_QC_API on USGODAE server • update call sign data base files in near real-time (daily, weekly?) Issues (1): US GODAE server hardware upgrade • GODAE_QC_API cannot run on existing hardware • still waiting on server hardware upgrade funded by ONR Issues (2) :Data problems • BMRC and Coriolis data are NetCDF – problems with corrupted data (bad values); have to work through data problems one file at a time • data corruption problems slowing down 2003-2008 production run • FNMOC, UKMO, MEDS files are Fortran readable – no data corruption problems with these files

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