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The H umidity C omposite P roduct of the CM-SAF Helga Nitsche

The H umidity C omposite P roduct of the CM-SAF Helga Nitsche Deutscher Wetterdienst, D-63067 Offenbach. Content:. The CM-SAF (short overview) The HCP: product definition and specification Validation of Input Data Gridding and Interpolation

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The H umidity C omposite P roduct of the CM-SAF Helga Nitsche

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  1. The HumidityCompositeProduct of the CM-SAF Helga Nitsche Deutscher Wetterdienst, D-63067 Offenbach Content: • The CM-SAF (short overview) • The HCP: product definition and specification • Validation of Input Data • Gridding and Interpolation • „Merging“ of satellite-derived precipitable water: the concept • User Requirements for HCP • User Requirements of HCP for GRAS-SAF GRAS-SAF User Workshop June 2003

  2. The HumidityCompositeProduct of the CM-SAF The CM-SAF: Overview • 5 Scientific Work Packages • Products connected to the Energy and Water Budget of the Earth • Regional Products • Product Groups: • Cloud Parameters • Surface Radiation • TOA fluxes • Surface Ocean Stress • Humidity Composite Product GRAS-SAF User Workshop June 2003

  3. The HumidityCompositeProduct of the CM-SAF The CM-SAF: The Products GRAS-SAF User Workshop June 2003

  4. Inner Arctic Circle Initial Baseline Area MSG Area km GMT 0 1000 2000 May 4 14:49:21 2001 OMC - kk+w The HumidityCompositeProduct of the CM-SAF The CM-SAF: The Processing Area GRAS-SAF User Workshop June 2003

  5. The HumidityCompositeProduct of the CM-SAF The HCP: Productdefinition • an independent water vapour profile data set • based on merged satellite products only • validated with sophisticated in-situ observations GRAS-SAF User Workshop June 2003

  6. The HumidityCompositeProduct of the CM-SAF Productspecification: • Precipitable water; total column and Layers between pressure levels • Physical units: g/kg resp. mm • Spatial resolution: <= 1 degree (0.5); >= 3 layers (5-6) • Temporal resolution: daily, monthly • Meta data: Input data sources, QC-Flags, Validation results, Merging Algorithm • First operational product: July 2005 • Duration: Operational long term product GRAS-SAF User Workshop June 2003

  7. The HumidityCompositeProduct of the CM-SAF GRAS-SAF User Workshop June 2003

  8. The HumidityCompositeProduct of the CM-SAF Validation Topics: GRAS-SAF User Workshop June 2003

  9. The HumidityCompositeProduct of the CM-SAF Validation Data: operational Networks: GRAS-SAF User Workshop June 2003

  10. The HumidityCompositeProduct of the CM-SAF Validation Data: Reference Stations: Instrumentation: GRAS-SAF User Workshop June 2003

  11. The HumidityCompositeProduct of the CM-SAF Gridding and Interpolation: GRAS-SAF User Workshop June 2003

  12. The HumidityCompositeProduct of the CM-SAF Spatial and Temporal Resolution of Input: GRAS-SAF User Workshop June 2003

  13. The HumidityCompositeProduct of the CM-SAF Merging: • Applicable models: • 1) NVaP (NASAWater Vapour Programme), Randel et.al. • 2) GPCC Huffman et.al. • Basic Idea: • Daily mean values on the Grid from Interpolation for the polar orbiter satellites (ATOVS-data from NOAA, METOP) • Bias Correction for TPW, biases from Validation • Profile Information from ATOVS, IASI: relative profiles (%) • improve horizontal resolution by SEVIRI • improve daily mean by SEVIRI • extension to Upper Troposphere/Lower Stratosphere with GRAS • perhaps additional constraints: DEM und TRP GRAS-SAF User Workshop June 2003

  14. The HumidityCompositeProduct of the CM-SAF User Requirements for HCP • Horizontal spatial resolution: < 10 .... 5000 km • vertical resolution: 3-8 Layers • time resolution: </= 1/h...1/d • parameters: precipitable water (& absolute/specific humidity) • area extension to MSG: yes • area extenstion to inner arctic circle: no/yes • accuracy: </= 10 % (</=5 %) GRAS-SAF User Workshop June 2003

  15. The HumidityCompositeProduct of the CM-SAF User Requirements for HCP Possible Applications • Reference Data Set • Background Data Set for Numerical Modeling • Validation Purposes • Process Studies • Input into Climate Monitoring Products GRAS-SAF User Workshop June 2003

  16. The HumidityCompositeProduct of the CM-SAF User Requirements of HCP for GRAS-SAF • Vertical Extent: at least up to the Lower Stratosphere • Metadata: extensive Metadata together with each Profile, including Time of Measurement, Horizontal Representativeness , Reliability/Representativeness of the Lowest Level, method/model used for the retrieval • Reprocessing Capability? Unlimited Archive of the Measurements and Metadata • individual profiles • highest possible absolute accuracy GRAS-SAF User Workshop June 2003

  17. The HumidityCompositeProduct of the CM-SAF Vertical Profiles of Precipitable Water GRAS-SAF User Workshop June 2003

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