Validation of Polarimetric Radar Signatures Using the 2D-Video Distrometer

摘要

From 10 Jun 96 to 10 Aug 96 a two-dimensional video distrometer was used tocollect rainfall measurements at the surface during convective storm events in the North-Eastern Colorado area. More than 20 successful storm events were recorded during the experimental period. The distrometer records two views of all hydrometeors that pass through its measurement area ( approx. 10 cm by 10cm) through the use of two CCD (charge coupled device) line scan cameras. The true velocity of the hydrometeors is also measured. This makes possible the calculation of very accurate equi-volumetric spherical diameters, size distributions, and particle non-sphericity and also to distinguish between rain, hail, graupel, and snow. This information can be used to calculate radar measurands via sophisticated scattering models thus validating recorded radar data that may be taken simultaneously with the distrometer measurements. Contained in the final report is a general description of the distrometer, operating procedures, and a compilation of plots of distrometer data collected during the experiment period. The final report can be used to provide an understanding of the data recording methods and the experimental procedure; it can also be used as a index to the recorded data set.