Rain Detection & Attenuation for Remote sensing; & auxiliary sensors. Dr. Sandra Cruz-Pol INEL 5995 DCAS –network weather radars. Total number of drops per unit volume. in units of mm -3. Reflectivity in other books. For Rayleigh approximation . The cross sectional areas of a scatterer.
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Dr. Sandra Cruz-Pol
DCAS –network weather radars
in units of mm-3
D=2r =diameter of drop
Mie scattering by dust particles and aerosols
Rayleigh scattering by water vapor molecules and gases.
Mie forward scattering nos impide ver bien a menos que haya alto contraste.
Z (in dB)
Reflectivity, h [cm-1]
dBZ for 1g/m3
Reflectivity and reflectivity factor produced by 1g/m3 liquid water
Divided into drops of same diameter. (from Lhermitte, 2002).
Several types of algorithms used to retrieve rainfall rate with polarimetric radars; mainly
R is rain rate,
Zh is the horizontal co-polar radar reflectivity factor,
Zdr is the differential reflectivity
Kdp is the differential specific phase shift a.k.a. differential propagation phase, defined as
X-band polarimetric radar simulation -estimator alto contraste.R(KDP) - less sensitive to natural variations in DSDDisdrometer
2-Dimensional video disdrometer
Water spout at Mayaguez, Sept 2005 alto contraste.
Rain gauge data alto contraste.
NEXrad dataCalibrated R-Z for 3 regions
Leonid Tolstoy, UPRM-CSU Collaborative Ph.D. student