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International Workshop on Rescue and Digitization

International Workshop on Rescue and Digitization of Climate Records in the Mediterranean Basin. Data Rescue Activities at Slovenian Meteorological Office Mojca Dolinar, Boris Pavčič, Mateja Nadbath Tarragona, 29 th November 2007. Outline. Present meteorological network

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International Workshop on Rescue and Digitization

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  1. International Workshop on Rescue and Digitization of Climate Records in the Mediterranean Basin Data Rescue Activities at Slovenian Meteorological Office Mojca Dolinar, Boris Pavčič, Mateja Nadbath Tarragona, 29th November 2007

  2. Outline • Present meteorological network • Structure of national meteorological archive • Description of DARE activities and results • Data inventory

  3. Present meteorological station network 13 Synoptic stations 26 Climatological Stations 176 Precipitation stations 32 Automatic Weather Stations

  4. Meteorological Database • Classical measurements: • 3 measurements per day (7 a.m., 2 p.m., 9 p.m.) • From 1961 all data have been systematically digitized • Automatic measurements: • Half an hour data (mean, max, min, terminal) • Precipitation: 5 min. • Up to 14 years long records

  5. Graphical catalogue • Systematic gaps: • first and second world war • break-line is the year 1961 (the beginning of systematic digitization process)

  6. Data preservation • Old paper data is stored: • EARS • Archive of Slovenia (better conditions for storing) • 9 locations with temperature and precipitation • 21 locations with precipitation Old climate data are bound and stored in logbooks and arranged by stations. Precipitation data are stored in boxes and arranged by stations.

  7. Digitization AMEBA: application for data digitalisation (basic logical control) • Historical units and instruments • Pressure and precipitation in Paris lines (’’’) = 2.256mm • Max/min temperature: Six’s thermometer The first preserved meteorological measurements started in 1850 in the capital city Ljubljana.

  8. Digitization • Observational time • In first years after 2nd world war observation time at climatological stations was not at regular hours. These data are stored in separate tables in database. • General mistakes • Often have to deal with unreadable data

  9. Quality control and validation • Few datasets available for comparison • Few additional data and resources available for checking • Larger distances – worse correlations between available data sets • Quality control – validation ?

  10. Metadata rescue • Digitization of paper card-file archive (gaps, missing data) • Filling gaps and missing metadata • Stations sites visiting/measuring/describing/photographing • Reconstruction of data after the old field logbooks • Reconstruction of data after the knowledge of elderly colleagues, residents and from historical resources like chronicles and journals

  11. Homogenization • Different methodes for inhomogenities detection, comparison and correction were tested and used: • For daily adjustments the correction factors were downscaled using periodical functions

  12. Results - LJUBLJANA • Begun to operate in 1850 • Standard observation time from 1866with a gap around 1929 • Meteorological station location changed six times (some locations have not been chosen properly). • Same location from 1948 on. • Main problems with data series: non-standard observation time, non-standard measurement units (Paris line), insufficient documentation of metadata

  13. Results - LJUBLJANA Temperature Number of warm days and tropical nights Mean annual temperature Number of cold and freezing days

  14. Long data series - Digitized • 5 locations with temperature and precipitation (93 – 151 years) • 13 locations with precipitation (79 – 112 years) • 1 mountainous location (2565 m, 52 years) Availability: not restricted Contact EARS

  15. Long data series - Potential • 9 locations with temperature and precipitation • 21 locations with precipitation • More than 70 years long • Few gaps • Original data available • 1359 years to digitize Availability: not restricted Contact EARS

  16. Future Problems: • DARE activities need a lot of resources (Experts, Time, Money) • Low priority in NMS Good experience -Interreg project FORALPS • Data digitization and validation • Metadata rescue • Homogenization During FORALPS project 1.356 data years were digitised, quality controlled or validated

  17. Future Missing data from W part of the country: • According to metadata some stations were operating • Monthly data for some stations were digitized from yearbooks (University of Milano) • Potential sources for daily data: Rome, Belgrade

  18. Thank You!

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