climate data records of ecvs from the cm saf
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Climate Data Records of ECVs from the CM SAF - Current Status and - PowerPoint PPT Presentation

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Climate Data Records of ECVs from the CM SAF - Current Status and application examples Martin Werscheck, Rainer Hollmann, Jrg Trentmann, Frank Kaspar 1 October 2015 Overview: Short introduction to CMSAF products Using CMSAF products

  1. Climate Data Records of ECVs from the CM SAF - Current Status and application examples Martin Werscheck, Rainer Hollmann, Jörg Trentmann, Frank Kaspar 1 October 2015

  2. Overview: • Short introduction to CMSAF products • Using CMSAF products to evaluate quality of ground based radiation measurements • Analysing requirements of in-situ networks for Germany (surface radiation, sunshine duration). 2 October 2015

  3. CM SAF Radiation Water Vapor Clouds • EUMETSAT Satellite Application • Data freely available in netcdf-format Facility on Climate Monitoring • User-friendly data access via the Web www.cmsaf.eu User Interface: www.cmsaf.eu/wui • Provides satellite-derived climate • Toolkit (example data + software): data of geophysical variables www.cmsaf.eu/tools • Regional, up to global coverage • CM SAF Community Site available via • Currently, data available from Jan 1982 to October 2015 EUMETSAT: training.eumetsat.int • Spatial resolution: 0.03° to 1° 3 October 2015

  4. CM SAF data  Cloud Information  Surface and ToA Radiation In the ‘pipeline’ (2016)  Surface Albedo Land Surface Temperature   Water Vapour In the ‘pipeline’ (2020ff)  Precipitation, wind, surface Precipitation (land)  fluxes (ocean only) Evapotranspiration   Free Tropospheric Humidity Satellites used to generate CM SAF data sets and operational products:  Meteosat (SARAH / CLAAS)  AVHRR (CLARA)  ATOVS / SSMI (HOAPS, FCDRs (=radiances)) 4 October 2015

  5. Data Access CM SAF data is freely available without restrictions! Web User Interface www.cmsaf.eu www.cmsaf.eu/wui Registration required • Data will be delievered in 1 hr to 1 day to • an ftp server in hdf / netcdf format 5 October 2015

  6. CM SAF Workshops CM SAF conducts annual workshops / online events to support the use of CM SAF data Upcoming Event: Applications of satellite-based data sets from the CM SAF in numerical modeling , 14 to 17 November 2016, ECMWF, Reading, UK 6 October 2015

  7. Surface Solar Radiation Dataset – Heliosat (SARAH) • Variables – Global irradiance (SIS) – Direct normalized irradiance (DNI) – Effective cloud albedo (CAL) • Resolution – Spatial: 0.05° × 0.05° – Temporal: hourly, daily, monthly means • Coverage – Spatial: Meteosat disk – Temporal: 1983 to 2013 • Satellites – Meteosat 2 to 10 (MVIRI/SEVIRI) • Freely available at www.cmsaf.eu 7 October 2015

  8. Application: Daily Variability Validation of SARAH daily mean irradiance with DWD network BSRN: Bias: 1.1 W/m2 MAB: 12.1 W/m2 8 October 2015

  9. Comparison Chemnitz Time series of differences between SARAH SIS and station measurement Obvioues jumps in 1989 and 1997 / 98 …. Inhomogenities in station data? 9 October 2015

  10. Climatology: Schleswig Multi-year daily averages Very high correlation • 10 October 2015

  11. Correlation: dm- anomaly CM SAF CM SAF data provide • good representation of the spatial structure of daily variability Correlation decreases • with distance of stations. 11 October 2015

  12. New DWD observation network The suggested new • DWD observation network for surface radiation covers almoste completely Germany with a correlation of >0.9 (based on SARAH) 12 October 2015

  13. Radiation Trends in D Positive trend in radiation • throughout D CM SAF underestimates trends by • about 1 W/m2/dec 13 October 2015

  14. Trend assessment, evaluation with GEBA Consistent linear trend; underestimated by about 1.5 W/m 2 /dec GEBA data provided by Arturo Sanchez-Lorenzo, IPE-CSIC, Zaragoza 14 October 2015

  15. Mainly positive trends • Spatial Trends Substantial spatial variability • 15 October 2015

  16. Application: WMO RCC, KU23 Climatology WMO RA VI Regional Climate Centre on Climate Monitoring (http://www.dwd.de/rcc-cm) 16 October 2015

  17. Sunny days in Europe www.cmsaf.eu 28.10.2014 21.10.2014 17 October 2015

  18. Application: Solarenergy (KU1 HA) DWD Solar Radiation Product for Germany: www.dwd.de/solarenergie Combined product using the CM • SAF SIS operational product and surface measurements Generated on a monthly basis • 18 October 2015

  19. Application: Sunshine Duration July May Sunshine Duration from DNI (SDU if DNI > 120 W/m2) 19 October 2015

  20. Sunshine duration: in-situ vs. satellite In-situ Sat Which product provides best representation of the real conditions? October 2015

  21. in-situ vs. satellite In situ only sat + 40 sat + 90 October 2015

  22. Error in sunshine duration vs. number of stations used for merging October 2015

  23. Summary: • CMSAF provides satellite-based datasets of several parameters • These datasets can be used to evaluate quality and homogenity of in-situ observations • DWD has analysed requirements for the in-situ network based on CMSAF radiation data. 23 October 2015

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