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Joël Jaffrain and Alexis Berne

, the size, shape, and fall velocity of raindrops are of particular interest. The shape and fall velocity of a raindrop can be accurately derived from its equivolume diameter (e.g., Beard 1977 ; Andsager et al. 1999 ). Therefore, a fundamental property of rainfall for the investigation of its microstructure is the (rain)drop size distribution (DSD). Rain, and hence DSD, is highly variable in time and space at inter- and intraevent scales as well as for different geographic locations ( Tokay and

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R. Uijlenhoet, J.-M. Cohard, and M. Gosset

. A. R. , Meijninger W. M. L. , and Schipper F. , 2002 : Experiences from one-year continuous operation of a large aperture scintillometer over a heterogeneous land surface . Bound.-Layer Meteor. , 105 , 85 – 97 . Bradley, S. G. , Stow C. D. , and Lynch-Blosse C. A. , 2000 : Measurements of rainfall properties using long optical path imaging . J. Atmos. Oceanic Technol. , 17 , 761 – 772 . Cain, J. D. , Rosier P. T. W. , Meijninger W. , and de Bruin H. A. R. , 2001

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H. Leijnse, R. Uijlenhoet, C. Z. van de Beek, A. Overeem, T. Otto, C. M. H. Unal, Y. Dufournet, H. W. J. Russchenberg, J. Figueras i Ventura, H. Klein Baltink, and I. Holleman

between 50 and 100 cm 2 , which derive particle sizes and fall velocities from the known optical scattering properties of hydrometeors. The 2DVD and one PWS are located within 10 m of each other at the remote sensing site (see Fig. 1 ). The other PWS is located at 200-m altitude in the meteorological tower and can hence provide information on the particle size distribution aloft. A dense network of approximately 15 tipping-bucket rain gauges is operated around the CESAR site by Wageningen University

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