Polarimetric radar studies of atmospheric ice particles Vivekanandan, J. ; Bringi, V. N., 1949- ; Hagen, Martin ; Meischner, Peter F. "This work was supported under FAA Contract DTFA01-90-Z-02005. The work of J. Vivekanandan and V. N. Bringi was supported by the National Science Foundation under Grants ATM-8915141 and ATM-9214864." Single scattering properties of ice crystals are described at microwave frequencies using discrete dipole approximations and Rayleigh scattering techniques. For a given shape, the average bulk densities of ice crystals can be estimated using the ratio of the copolarized radar signal in a linear (horizontal, vertical) polarization basis. Reflectivity depends on the ice content (g • m-3 ), and also on both size distribution parameters and average bulk density of the scatterers. Differential propagation phase is primarily a function of shape, ice water content, and is independent of size distribution parameters. Thus, by using a combination of polarimetric radar measurements, average ice content, bulk density, and shape of distributed scatterers can be inferred. These techniques become quite complex in the case of a winter storm where scatterers can exist with varying shape and bulk densities. Polarimetric radar properties of such complex distributed scatterers are modeled. Physical variations in the relation among ice water content, reflectivity, and differential propagation phase are considered with respect to change in the shape of size distribution, bulk density, and average shape of the scatterers. Also, simultaneous polarimetric radar observations and in situ aircraft measurements are shown to demonstrate practical applicability of the techniques. Colorado State University. Libraries 1994 text ; image application/pdf ECEvnb00004.pdf FACFECEN100614ARTI eng c1994 IEEE
Polarimetric radar studies of atmospheric ice particles
Vivekanandan, J. ; Bringi, V. N., 1949- ; Hagen, Martin ; Meischner, Peter F.
"This work was supported under FAA Contract DTFA01-90-Z-02005. The work of J. Vivekanandan and V. N. Bringi was supported by the National Science Foundation under Grants ATM-8915141 and ATM-9214864."
Single scattering properties of ice crystals are described at microwave frequencies using discrete dipole approximations and Rayleigh scattering techniques. For a given shape, the average bulk densities of ice crystals can be estimated using the ratio of the copolarized radar signal in a linear (horizontal, vertical) polarization basis. Reflectivity depends on the ice content (g • m-3 ), and also on both size distribution parameters and average bulk density of the scatterers. Differential propagation phase is primarily a function of shape, ice water content, and is independent of size distribution parameters. Thus, by using a combination of polarimetric radar measurements, average ice content, bulk density, and shape of distributed scatterers can be inferred. These techniques become quite complex in the case of a winter storm where scatterers can exist with varying shape and bulk densities. Polarimetric radar properties of such complex distributed scatterers are modeled. Physical variations in the relation among ice water content, reflectivity, and differential propagation phase are considered with respect to change in the shape of size distribution, bulk density, and average shape of the scatterers. Also, simultaneous polarimetric radar observations and in situ aircraft measurements are shown to demonstrate practical applicability of the techniques.
Colorado State University. Libraries
1994
text ; image
application/pdf
ECEvnb00004.pdf
FACFECEN100614ARTI
eng
c1994 IEEE