Showing papers on "Disdrometer published in 1989"

Rain-induced attenuation effects on C-band dual-polarization meteorological radars

Abstract: An attenuation correction procedure is proposed and evaluated by simulations using raindrop size distribution obtained from ground-based disdrometer measurements. The results show that under certain conditions it is possible to retrieve C-band reflectivity factor (Z/sub H/) and differential reflectivity (Z/sub DR/) radar observables affected by attenuation along rain-filled propagation paths. Rainfall rates estimated from Z/sub H/ and Z/sub DR/ with and without attenuation correction are compared to determine the effects of attenuation and the capability of the correction procedure to account for it. >

Comparison of Simulated Rain Rates from Disdrometer Data Employing Polarimetric Radar Algorithms

Abstract: Disdrometer data collected during three spring days, with moderate to heavy rain in the Norman, Oklahoma region are used with various polarimetric radar algorithms to simulate rain rates. It is assumed that available measurables are 1) reflectivity at horizontal polarization, 4,2) differential reflectivity, ZDR (ratio of horizontal to vertical reflectivity factors in dB), and 3)differential propagation constant, K D ~ . The accuracies of the simulated rain rates from Z,, Z D ~ , and KDP are evaluated and compared. A new algorithm that utilizes both reflectivity factor and differential propagation constant is also examined. In comparing the relative accuracies, the disdrometer-derived rain rates are assumed to be the "truth" measurements