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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-51
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-51
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 17 Apr 2019

Submitted as: research article | 17 Apr 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Estimating raindrop size distributions using microwave link measurements

Thomas C. van Leth1, Hidde Leijnse2, Aart Overeem1,2, and Remko Uijlenhoet1 Thomas C. van Leth et al.
  • 1Hydrology and Quantitative Water Management Group, Wageningen University
  • 2R&D Observations and Data Technology, Royal Netherlands Meteorological Institute (KNMI)

Abstract. We present a novel method of using two or three collocated microwave link instruments to estimate the three parameters of a gamma raindrop size distribution (DSD) model. This allows path-average DSD measurements over a path length of several kilometers as opposed to the point measurements of conventional disdrometers. Our method is validated in a round-trip manner using simulated DSD fields as well as five laser disdrometers installed along a path. Different potential link combinations of frequency and polarization are investigated. We also present preliminary results from the application of this method to an experimental setup of collocated microwave links measuring at 26 GHz and 38 GHz along a 2.2 km path. Simulations show that a DSD retrieval on the basis of microwave links can be highly accurate. We found that a triple link retrieval provides no added benefit over a dual link retrieval. In practice, the accuracy and success of the retrieval is highly dependent on the stability of the base power level.

Thomas C. van Leth et al.
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Thomas C. van Leth et al.
Thomas C. van Leth et al.
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Short summary
We present a method of using collocated microwave link instruments to estimate the average size distribution of raindrops in a path of several kilometers. Our method is validated using simulated fields as well as five laser disdrometers installed along a path. We also present preliminary results from an experimental setup measuring at 26 GHz and 38 GHz along a 2.2 km path. We show that a retrieval on the basis of microwave links can be highly accurate, provided the base power level is stable.
We present a method of using collocated microwave link instruments to estimate the average size...
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