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Current research on historical air-pressures at KNMI (the Netherlands)

Current research on historical air-pressures at KNMI (the Netherlands). Theo Brandsma. AOPC/OOPC Surface Pressure Working Group - 21 October 2005 - Exeter. Contents. Contents. Construction of a Central Netherlands daily air pressure series (1712-present)

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Current research on historical air-pressures at KNMI (the Netherlands)

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  1. Current research on historical air-pressures at KNMI(the Netherlands) Theo Brandsma AOPC/OOPC Surface Pressure Working Group -21 October 2005 - Exeter

  2. Contents Contents • Construction of a Central Netherlands daily air pressure series (1712-present) • Quality control of the air pressures in the maritime Maury dataset (1780-1857) • Homogenization of the hourly pressure series of the Amsterdam City Water Office (1824-1963) • Contribution to the ENSEMBLES gridded datasets (1900-present)

  3. N Haarlem * * Amsterdam * Zwanenburg Utrecht * Leiden * * De Bilt * Breda Middelburg * Vlissingen * 0 15 30 km 1. Central Netherlands daily air pressure series (1712 – present) Stations with (sub)daily pressure observatons

  4. De Bilt Utrecht Middelburg Vlissingen Zwanenburg Amsterdam Leiden Haarlem 1. Central Netherlands daily air pressure series (1712 – present) Measurement periods Breda

  5. 1. Central Netherlands daily air pressure series (1712 – present) Time series of 4 contributing stations

  6. 2. Maury data (1780-1857) Maury data set Annual number of observations in CLIWOC, I-COADS Release 1 and the US Maury collection 1750-1870. All values are reduced to number of ship-day observations

  7. 2. Maury data (1780-1857) Problems with the air pressures in the Maury dataset • Time dependent negative bias • Uncertainty about units • Uncertainty about corrections

  8. 3. Amsterdam City Water Office (1824-1963) Hourly weather observation of the Amsterdam City Water Office (1784–1963)

  9. 4. Ensembles gridded datasets (1900 – present) WP5.1 Development of daily high-resolution gridded observational datasets for Europe • Collection of (among others) daily pressure data for Europe • Quality control of the data • Individual time series in ECA&D (European Climate Assessment and Dataset)  http://eca.knmi.nl • Gridded datasets ready in 2007 • http://www.knmi.nl/samenw/ensembles_rt5/WP51.html

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