| In this research, two Doppler radars working at W-band (95GHz) and at S-band (2.8GHz) together with radiosonde observations (RaOb) were used to retrieve physical parameters such as rainfall rate and vertical air motion (Wt) in rain. These instruments were deployed at the U.S. Department of Energy Atmospheric Radiation Measurement (DOE ARM) Cloud and Radiation Testbed (CART) site in Lamont, Oklahoma where rain data was collected on November 8, 2001 at hour 21:00:17 UTC. In order to retrieve these parameters, the data was processed and analyzed following an iterative method similar to that proposed by Firda [Firda et al. , 1999, Firda 1997], but using the Marshall-Palmer drop size distribution and a lower non-attenuating frequency, to consider higher rainfall rates. This iterative method includes the use of Liebe's model for suspended water droplets, Mie scattering theory, Green's raindrops shape model and the ideal gas model. Rainfall rates were found to go from 0 mm/hr to 69.9 mm/hr. Vertical air motion was retrieved and values described updraft up to 2.5 m/s and downdrafts up to -1.2 m/s. |
