Combining a rain microphysical model and observations: Implications for radar rainfall estimation

Journal Article

A bin-model was used to characterize the signature of dynamical microphysical processes on Z-R relationships used for radar rainfall estimation. The sensitivity analysis performed shows that coalescence is the dominant microphysical process for low to moderate rain intensity regimes (R < 20mm h-1), and that rain rate in this regime is strongly dependent on the spectral properties of the DSD (i.e. the shape). For high intensity rainfall (R > 20mm h-1), collision-breakup dynamics dominate the evolution of the raindrop spectra. Analysis of the time-dependent Z-R relationships produced by the model suggests convergence to a universal Z-R relationship for heavy intensity rainfall. Conversely, the model results show that Z-R relationships severely underestimate reflectivity in the light rainfall regime. ©2009 IEEE.

Full Text

Duke Authors

Cited Authors

  • Prat, OP; Barros, AP

Published Date

  • September 11, 2009

Published In

International Standard Serial Number (ISSN)

  • 1097-5659

Digital Object Identifier (DOI)

  • 10.1109/RADAR.2009.4977122

Citation Source

  • Scopus