Support of AMMA and Radagast from CMSAF

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Support of AMMA and Radagast from CM-SAF
R. Hollmann, J. Schulz Climate Monitoring
Satellite Application Facility Deutscher
Wetterdienst Offenbach, Germany
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Overview of Talk

• Short overview of CMSAF and its products
• Validation summary of surface radiation budget
  from CMSAF
• Inter-comparison of CMSAF products for AMMA
• Conclusion / further work

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Motivation climate monitoring

• To assess current climate for infrastructure
  planning
• To assess climate variability and detect change
  of mean state and variability
• To support the development of climate models by
  validating long range/short term climate
  projections
• To assess climate impacts
• To provide evidence (or not) for policy action
  (or not).

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Facts of CMSAF

• Climate Monitoring Satellite Application Facility
  (CMSAF)
• Part of EUMETSATs ground segment for MSG, 7
  further SAF exists with dedicated user groups
• CMSAF next phase 2007-2012 Continuous
  Development and operational phase (CDOP)
• Major task in CDOP will be the (re-)processing of
  long-time series of satellite data
• Continuation of routine products already
  available and addition of new improved products

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Clouds and sfc radiation extended area (available
now!)
Monthly mean values February 2007
Fractional cloud cover
Solar radiation at surface
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Precipitable Water and Surface Temperature
1 July 2004, 1200 UTC
LPW (850-500 hPa)
LPW (lt500 hPa)
LPW (1000-850 hPa)
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Retrieval Overview

• Retrieval
• Vertical integrated water vapour (IWV), total 3
  layers(below 850hPa, 850-500hPa, 500-200hPa)
• Surface temperature
• Clear-sky only
• Data used
• SEVIRI IR channels
• Radiosondes for static background and
  determination of covariance
• No additional NWP data (stand-alone product)
• Method
• Optimal estimation technique
• Find most likely state vector
• Gauss-Newton method (problem is not too
  non-linear)

8
SEVIRI/AMSR TPW Comparisons
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Bias Monitoring

• BIAS Monitoring, ocean (Simulation(NCEP-GFS) -
  Observation)

Model change
Change of cal. coef.
SEVIRI decontamination
SEVIRI decontamination
Courtesy of M. Stengel, SMHI
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SEVIRI/AMSR TPW Comparisons
Before bias correction
After bias correction
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Overview of Talk

• Short overview of CMSAF and its products
• Validation summary of surface radiation budget
  from CMSAF
• Results of an inter-comparison of CMSAF products
  within a GEWEX initiative (RFA)
• Conclusion / further work

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Validation over Ocean -gt FS Meteor
9-Monthly Mean of SIS 157,1 W/m² FS Meteor
160,7 W/m² Satellite
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Validation over Ocean -gt FS Meteor
6-Monthly Mean of SDL 311,7 W/m² FS Meteor
306,1 W/m² Satellite
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Summary of validation
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Overview of Talk

• Short overview of CMSAF and its products
• Validation summary of surface radiation budget
  from CMSAF
• Inter-comparison of CMSAF products for
  AMMA/Radagast
• Conclusion / further work

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Overview of available datasets (I)

• Area covered
• 4.99 S to  30.04 N, 30.07 W to  30.43 E. 
• Size
• 1188 x 1774 pixel for Jan-May 2006
• 3636x 3636 pixel for Jun-Dec 2006 (Full disc).
• Data format
• Instantaneous binary (rad-products), hdf5 (cloud
  products)
• Daily/monthly hdf5

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Overview of available datasets (II)
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CMSAF_at_AMMA
First Quicklook of data
Example Cloud fraction 01.01.2006, 1200
Example Solar Radiation W/m² _at_
surface 15.02.2006, 1300
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RADAGAST/AMMA 2006 Support of special campaigns
Solar incoming radiation vs ARM-data
Longwave downwelling radiation Vs ARM-data
Jan-March 2006, instantaneous data (bias sfc-sat)
Acknowledgments Surface radiation data for
validation have been kindly provided by the
mobile ARM facility.
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AMMA-validation March 2006
Scatter-plot only Data in March
Why?
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Additional measurements in Niamey?
Niamey webcam 08.03.06
Slingo et al.. GRL (2006)
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SEVIRI/ground based Comparisons (I)
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SEVIRI/ground based Comparisons (II)
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SEVIRI/ground based Comparisons
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Overview of Talk

• Short overview of CMSAF and its products
• Validation summary of surface radiation budget
  from CMSAF
• Results of an inter-comparison of CMSAF products
  within a GEWEX initiative (RFA)
• Conclusion / further work

26
Summary

• CM-SAF has build a data processing system for
  water vapour cloud radiation products using
  several polar and geostationary instruments that
  allows for reprocessing of large data volumes
• Usefulness of near real time integrated products
  depends largely on the stability of the
  calibration. Currently, some are only usable for
  sub-seasonal analysis.
• Extra European validation of CMSAF SRB data with
  AMMA ARM-measurements gives small differences.

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Summary II

• Operational validation of surface radiation
  budget products show a good agreement with
  surface observations (MAB SW lt 5 W/m², LW lt 10
  W/m²)
• The next CMSAF phase will see integration of long
  time series for core products based on inter- and
  recalibrated radiances, e.g. Patmos-X AVHRR and
  UTH Meteosat exercises

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Thank you for your attention
To obtain data more informations
http//www.cmsaf.eu Note Special AMMA data are
available upon request (user help desk)
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Retrieval of Water Vapour from SEVIRI
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CM-SAF Product Group Water Vapour

• Water vapour and temperature in the atmosphere
  from SEVIRI, ATOVS, (IASI), SSM/I
• Total and layered column water vapour
• Specific and relative humidity as well as
  temperature profile

ATOVS
Global, coarse spatial resolution, medium
accuracy, profile information (improved by IASI).
SSM/I
MSG coverage, high spatiotemporal resolution,
medium accuracy, coarse profile information.
Ocean only, medium spatial resolution, high
accuracy, no profile information.
SEVIRI