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European contribution to the Global Precipitation
Measurement mission (EGPM)
Contributions Remko Uijlenhoet (Wageningen
Universiteit) Herman Russchenberg (TU Delft /
IRCTR) Iwan Holleman (KNMI)
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Global Precipitation Measurement mission

• Developing international partnerships to
  understand global precipitation and its impact on
  Humankind (NASA)
• Global precipitation measurement improves
• Water resource management, agriculture, forestry
• Policy and planning
• Transportation
• Natural hazards assessment
• Hydrology and oceanography
• Public outreach, education

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Objective / questions

• Measure global precipitation, a key climate
  factor, with improved temporal resolution and
  spatial coverage (NASA)
• How does precipitation impact changing earth?
• Global precipitation, evaporation and water cycle
• Effects of clouds and surface hydrologic
  processes
• Variations in local weather and water resources
• Weather forecast duration and reliability
• Transient climate variations
• Long-term climatic trends

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Mission design

• 1 core satellite (dual frequency 13.6 / 35 GHz
  imaging pulsed radar, TMI-like radiometer)
• 8 constellation satellites (passive microwave
  radiometers)

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European contribution to GPM (EGPM)

• Baseline (MW radiometer)
• Improved spectral features with respect to SSM/I
  dual polarisation in all channels (18.7, 23.8,
  36.5 and 89 GHz) and additional 157 GHz channel
  for improved light rain and snow detection
• Spatial resolution comparable with TRMM TMI (5.5
  km at 89 GHz, significantly greater than 15 km of
  SSM/I and successor SSMIS)
• Add-on slices (rain radar, improved radiometer)
• 35.9 GHz nadir-pointing rain radar with 3
  cross-track parallel beams and 4 km (h) x 250 m
  (v) resolution

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EGPM consortium

• Core team (retrieval algorithms, etc.)
• CNR-IFA, Rome, Italy (Mugnai), CETP/CNRS, Paris,
  France (Testud), and others
• Supporting team (mainly ground validation)
• Italy (CNR-IFA), France (IPSL), Germany (DLR),
  United Kingdom (RAL) , Spain (Catalunya), Austria
  (Graz), Netherlands (CESAR)
• Industry
• Alcatel Space Industries, Alenia Spazio, Carlo
  Gavazzi Space (CGS)

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Dutch consortium for EGPM (CESAR)

• KNMI (contact Iwan Holleman)
• 2 C-band doppler radars, national rain gauge
  network
• TU Delft / IRCTR (contact Herman Russchenberg)
• TARA (Transportable Atmospheric Research Radar),
  SOLIDAR (Solid State Weather Surveillance Radar)
• Wageningen University and Research Centre
  (contact Remko Uijlenhoet)
• Disdrometer, high-resolution rain gauge network,
  hydrological measurements

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Ground validation for GPM

• Potential GPM validation sites

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Ground validation for GPM

• Supersite concept