Free access to climate observations from Germany: An overview of recent activities of DWD s Climate Data Center (CDC)

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1 1 Free access to climate observations from Germany: An overview of recent activities of DWD s Climate Data Center (CDC) Frank Kaspar, Andrea Kaiser-Weiss, Elsbeth Penda, Frank Kratzenstein Deutscher Wetterdienst

2 Data policy: Geodatennutzungsverordnung Since 2014 DWD freely provides a much greater selection of climate data (national and international data). This was possible based on the so-called Geodatennutzungsverordnung (for govermental data). Data is protected by copyright, but may be used without any restrictions, provided that the source is indicated ( Deutscher Wetterdienst ). For details see the terms_of_use.txt. Data can be accessed here: ftp://ftp-cdc.dwd.de/pub/cdc/ 2

3 CDC FTP-Server (1): Station data CDC-ftp-server Observations from German stations 3

4 CDC FTP-Server (2) Station data Observations at German stations Historical and recent data: Temporal resolution: Air temperature, soil temeprature, hourly, daily, monthly, long-term pressure, wind (speed and dierction), ( , , ) sunshine duration, cloudiness and radiation Phenology Reporting: approx active stations Annual and immediate reporters where the state of development of selected plants (e.g., apple, birch, snow drops, goose berry, wheat, wine etc) is reported. 4

5 Remarks on provision of station data Historic data in the data base might change due to quality control or data rescue activities. Historic time series on the public server are therefore updated once a year. Recent data include approx. the data of the last year (until yesterday). These packages are updated daily. 5

6 Data rescue Annual number of climate stations digitized by the KLIDADIGI project in the period (colors) Frank CDC, Frank Kaspar, Kaspar, Data Nationale Management Klimaüberwachung, Workshop Mai 2015, St. Gallen

7 Selected examples of station-related metadata (in German, station Kassel ): Top: details on daily average wind speed; Bottom: instrumentation used for precipitation measurements. ftp://ftp-cdc.dwd.de/pub/cdc/observations_germany/climate/daily/kl/historical/ 7

8 CDC FTP-Server (3) Rasterdaten CDC-ftp-server Gridded products for Germany 8

9 CDC FTP-Server (4) Gridded data for Germany Gridded fields covering Germany at different temporal resolutions (not every parameter is given at all resolutions). Following precipitation data are available: RADOLAN precipitation fields are derived from radar together with station data (hourly, daily). REGNIE precipitation fields are derived from precipitation stations only (daily). Precipitation fields derived from climatological stations only are given with monthly resolution. Soil moisture, soil temperature at 5cm depth, potential and real evaporation are available at daily, monthly, and multi-annual resolution Air temperature (mean, max, min), sunshine duration, drought index, as well as the numbers of days with snow, frost days, or exceeding certain thresholds for temperature or for precipitation are given at monthly or multi-annual resolution. Solar irradiance fields are derived from satellite data and ground-based stations at monthly, annual and multi-annual resolution. Wind energy related parameters derived from station measurements are given as multiannual mean. 9

10 Examples: gridded daily precipitation products: derived from station measurements (REGNIE) ftp:// derived from radar observations combined with station data (RADOLAN). ftp://ftp-cdc.dwd.de/pub/cdc/grids_germany/daily/regnie/ CDC, ftp://ftp-cdc.dwd.de/pub/cdc/grids_germany/daily/radolan/ Frank Kaspar, Nationale Klimaüberwachung, Mai

11 German Climate Atlas Allows visualisation of monthly gridded climate montoring products. 11

12 Recent development: Information for Germany s federal states. 12

13 CDC FTP-Server (5) Derived data derived data gemessene Parameter an DWD-Stationen

14 Derived parameters at station locations Soil parameters include the potential and real evaporation over grass and sandy clay, the soil moisture below sand and sandy clay, the calculated soil temperatures at 5cm, 10cm, 20 cm, 50 cm and 100cm depth below bare soil, and the maximal frost penetration depth. Available resolution: daily, monthly and multi-annual. The soil parameters are calculated for about 320 stations since

15 Data set descriptions Metadata are provided by the internal experts for each data product (-> Excel) Automatic procedure to generate data set description (PDF). INSPIRE-XMLs for GISC or DOIregistration can also be automatically (and consistently) generated. 15

16 Datasets from externally funded activities Gridded products for Europe Homogenized radiosonde data 16

17 daily grids temp./wind for Europe Daily mean temperature 31 July 2010 Daily wind speed 28 February 2010 doi: /DWD_CDC/DECREG0110v1 17

18 High-resolution daily gridded datasets of air temperature and wind speed for Europe: doi: /essdd (ESSD) 18

19 Frank CDC, Frank Kaspar, Kaspar, Data Nationale Management Klimaüberwachung, Workshop Mai 2015, St. Gallen 19

20 Summary Current status: Since last year, DWD significanlty extended free access to climate data These data are currently provided with a FTP-Server Academic users are very enthusiastic about that; others would like to have more interactive access to the data. An interactive portal is currently in preparation ( CDC-2.0 ) 20

Primary author: Kaspar, Frank (DWD - Deutscher Wetterdienst), Frank.Kaspar@dwd.de

Primary author: Kaspar, Frank (DWD - Deutscher Wetterdienst), Frank.Kaspar@dwd.de Co-authors: Johannes Behrendt (DWD - Deutscher Wetterdienst), Klaus-Jürgen Schreiber (DWD - Deutscher Wetterdienst) Abstract