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Integrated Global Radiosonde Archive

Integrated Global Radiosonde Archive. Imke Durre and Russell S. Vose National Climatic Data Center +1 828 271 4870 Imke.Durre@noaa.gov. Overview. Goal – Develop and maintain a global historical archive of radiosonde and pibal observations

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Integrated Global Radiosonde Archive

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  1. Integrated GlobalRadiosonde Archive Imke Durre and Russell S. Vose National Climatic Data Center +1 828 271 4870 Imke.Durre@noaa.gov

  2. Overview • Goal – Develop and maintain a global historical archive of radiosonde and pibal observations • Source Data – IGRA version 1.0 contains 11 source datasets routinely updated with GTS observations • Deliverables – IGRA version 2.0 (FY12) • ECVs addressed • Upper air temperature • Wind speed and direction • Water vapor • Current/expected user communities • Assessments and monitoring (RATPAC, HadAT) • Research and reanalysis

  3. Approach • Acquisition • Contact data centers • Exploit personal contacts • Preprocessing • Format standardization • Fundamental sanity checks • Integration • Data comparisons • Station selection and merging

  4. Approach • Quality assurance • Basic plausibility • Internal consistency • Repetition of values • Temporal consistency • Vertical consistency • Reprocessing • Annual reprocessing

  5. Accomplishments: IGRA version 1 • Released in 2005 • 1538 stations • 30x106 soundings • 11 data sources • 1 daily update • 2 access points • FTP • NOMADS

  6. Accomplishments: IGRA version 1

  7. Research-to-Operations Results • Fully operational dataset at NCDC • Daily processing • Updates with soundings from previous day • Places updated dataset on FTP • Monthly processing (5th day of month) • Computes monthly means and inventories • Places monthly means on FTP • Sends data to the NCDC Archive • Provides inventories to Health of Network

  8. Publications • Durre, I., R.S. Vose, and D.B. Wuertz, 2006: Overview of the Integrated Global Radiosonde Archive. Journal of Climate, 19, 53-68. • Durre, I., R.S. Vose, and D.B. Wuertz, 2008a: Robust automated quality assurance of radiosonde temperatures. Journal of Applied Meteorology and Climatology, 47, 2081-2095. • Durre, I. and X. Yin, 2008b: Enhanced radiosonde data for studies of vertical structure. Bulletin of the American Meteorological Society, 89, 1257-1262. • Durre, I., C.N. Williams, Jr., X. Yin, and R.S. Vose, 2009: Radiosonde-based trends in precipitable water over the Northern Hemisphere: An update. Journal of Geophysical Research – Atmospheres, 114, doi:10.1029/2008JD010989.

  9. Trends in Precipitable Water (0.45 mm dec-1)

  10. IGRA version 2 • Currently in development • Acquisition/reformatting (done in FY10) • Preprocessing/standardization (FY11) • Integration (station matching) (FY12) • QA and update system (FY12)

  11. Acquisition/Reformatting • 92 data sets considered • 42 collections reformatted (major effort) • Priorities • Pre-1963 collections • Data-sparse areas • Recently digitized (CDMP) • Used by other reanalyses

  12. Examples of New Source Datasets • Non-IGRA version 1 data sets from NCDC archive • Brazil, China, marine • MIT and C-CARDS from NCAR (pre-1963) • Bronnimannacquisitions (primarily Europe) • Other diverse archives • British Antarctic Survey, Historical Arctic Radiosonde Archive • CDMP data • Malawi, Senegal, Kenya, Mozambique, Niger, U.S., Zambia • French West African data • Benin, Burkina Faso, Cameroon, Central African Republic, Chad, Congo, Gabon, Ivory Coast, Guinea, Mauritania, Niger, Senegal, Togo

  13. IGRA v1 IGRA v2

  14. Russian GTS Data • Comparison • U.S. and Russian GTS data are ~99% identical • But Russian GTS has some data not in U.S. GTS • IGRA v1 • Only used Russian GTS data for 1998-2001 • Updates have been sporadic and mainly upon request • IGRA v2 • Will use Russian GTS data for 1998-2009 • Other data would be nice

  15. Wish List • Regular updates of Russian GTS data • Accessible on a Russian FTP server • NCDC could download automatically (e.g., monthly) • Documentation for the data • Existing code for reading Russian GTS data is 10 years old • New code could be written using format documentation • Data for previous years • Is 1991-1997 available?

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