GRAS-SAF User Work shop June 2003 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
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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 - PowerPoint PPT Presentation
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•Meta data: Input data sources, QC-Flags, Validation results, Merging Algorithm
•First operational product: July 2005
•Duration: Operational long term product
The HumidityCompositeProduct of the CM-SAFProductspecification:
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The HumidityCompositeProduct of the CM-SAF
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The HumidityCompositeProduct of the CM-SAFValidation Topics:
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The HumidityCompositeProduct of the CM-SAF Validation Data: operational Networks:
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The HumidityCompositeProduct of the CM-SAFValidation Data: Reference Stations:
Site Description of Lindenberg:
Geographic coordinates: 52 0 13 ì North and 14 0 07 i East; approximately 60 km eastward ofBerlin.
Station height (radiosonde): 112 m NN.Natural Region: “Ostbrandenburgische Platte”.History: Meteorological Observatory since 1905.Representativeness: for frequent passages of mature cyclones.Additional information: The Meteorological Observatory Lindenberg (MOL) is a reference
station within the GEWEX Water Vapour Programme (GVaP)
1. Operational Radiosonde Station (4 ascents per day; humidity calibrated and corrected withweekly ascents of a reference radiosonde)
2. Microwave Radiometer3. Microwave Profiler4. GPS-Receiver5. Ceilometer6. Sunspectrometer7. Starspectrometer8. Cloud Radar9. Differential Absorption LIDAR (Coorperation with the MPI, Hamburg)
Instrumentation:
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The HumidityCompositeProduct of the CM-SAFGridding and Interpolation:
„Raw“ Data: Values and postions as reportet originally
Interpolation in time:
linearly; values within a choicable radius
Gridding: values „binned“ into the grid (0.5x0.5 degrees)
•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
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The HumidityCompositeProduct of the CM-SAFUser 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 %)
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The HumidityCompositeProduct of the CM-SAFUser Requirements for HCP
Possible Applications
•Reference Data Set
•Background Data Set for Numerical Modeling
•Validation Purposes
•Process Studies
•Input into Climate Monitoring Products
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The HumidityCompositeProduct of the CM-SAFUser 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
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The HumidityCompositeProduct of the CM-SAFVertical Profiles of Precipitable Water