SSE-14-0022_17
11
Meteorological parameters
:
- Reference information.
1. Weather radar equation.
The particle distributed volume observes by:
2. General radar equation.
The solid objects observe by:
For more description:
- Reflectivity factor Zh (dBZ):
1. In this filed, unit “dBZ” is used for reflectivity. The unit of Z is mm
6
/ m
3
. This factor will be calculated from
the weather radar equation, it means distribution and density of raindrops exist in a unit volume.
2. It can be converted to the rainfall intensity R (mm/h)
:
3. Larger Zh and R show a heavier rain.
- Doppler Velocity V (m/s):
It can find out a moving speed of rainfall area. The plus number means it is away from radar and the
minus number tells it is toward from radar. It can use 2D or 3D velocity to calculate rainfall from 2 or 3
radars.
- Doppler Velocity width W (m/s):
This is a standard deviation of V. It will be spread by disturbance, noise, and more. Normally it is used for
noise rejection from V.
- Cross Polarization Difference Phase
dp:
The phase shift difference between horizontal and vertical
polarized waves.
- Specific Difference Phase KDP:
It is a range differential of
dp. It mainly used for a heavy rain observation and it will not depend on
transmit/receive power. It will be possible to recover attenuated signal without TX/RX calibration.
- Correlation Coefficient between 2 polarizations
hv:
It can find out a reflectivity difference from this parameter. It can
also use for classification for example, Zh is high, ZDR is low
(=1): indicating hail:
Image 2: Comparison of observing in wider area
Calculated
by Zh
Calculated by Kdp+ Zh
