Observation report of MRR (3)

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Observation report of MRR(3)

• Tomoki Koshida
• Research fellow of OKI/KANAE LAB

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Introduction

• Micro rain radar (MRR) are introduced in IIS at
  late July 2003

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Todays topic

• The difference of rain fall rate by MRR and by
  ground based rain gauge
• 1. Check the ground based
• 2. check the MRR algorism

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From Previous talk
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Check the rain gauge
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The result of check
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Next check MRR algorism

• Observed the reflectivity by Doppler
  spectrum(observed speed)
• Doppler spectrum related to rain drop size
• The reflectivity related to the number of drops

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Drop size fall velocity

• Gunn Kinzer(1949)

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number distribution
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Contribution by drop size spectrum
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The result of past research

• Best(1950)

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conclusion

• Ground based rain gauge is right at the range
  10mm/h to 50mm/h
• Smaller droplet observation of MRR is suspicious
  for quantitative observation