Rainfall Microphysics and Radar Properties: Analysis Methods for Drop Size Spectra

Statistical Analysis of Radar Rainfall Error Propagation

The prediction uncertainty of a hydrologic model is closely related to model formulation and the uncertainties in model parameters and inputs. Currently, the foremost challenges concern not only whether hydrologic model outputs match observations, but also whether or not model predictions are meaningful and useful in the contexts of land use and climate change. The latter is difficult to determ...

Radar Doppler spectra recording at the ARM sites. An insight to cloud microphysics and turbulence

The U.S. Department of Energy’s Atmospheric Radiation Measurement (ARM) Program operates several stationary and mobile aerosol and radiation measurement sites in climatologically significant regimes. At the ARM sites, millimeter wavelength profiling Doppler radars (operating at 35and 94-GHz) provide continuous high-resolution (2 sec, 45 m) 256-point FFT Doppler spectra observations of clouds an...

Mean Drop Size and Drop Size Distribution in a Hanson Mixer-Settler Extraction Column

A method for estimating rain rate and drop size distribution from polarimetric radar measurements

Polarimetric radar measurements are sensitive to the size, shape and orientation of raindrops and provide information about drop size distribution (DSD), canting angle distribution and rain rate. In this paper, we propose and demonstrate a method for retrieving DSD parameters for calculating rain rate and the characteristic particle size. The DSD is assumed to be a Gamma distribution and the go...

P2b.1 Constrained Gamma Drop Size Model for Polarimetric Radar Rain Estimation: Justification and Development

Accurate rain estimation from radar measurements has been a difficult task due to the variation of raindrop size distribution (DSD), lack of accurate axis ratio model, measurement error, clutter, and so forth. Previously, rain estimation from weather radars has been largely dependent upon empirical relations such as R-Z relations. The development of polarimetric radar makes accurate rain DSD re...