S-pol Polarimetric Data for 990217

 

This page contains time series and scatter plots of various polarimetric quantities (Zh, Zdr, D0,LWC) over the NOAA Profiler location using S-pol data in radar coordinates extracted from the profiler/rain gauge/disdrometer location. Horizontal reflectivity (Zh) and differential reflectivity (Zdr) are raw fields collected by S-pol. The derived quantity median volume diameter (D0) is based on a relation:

D0(Zdr) = 1.529*(Zdr)^0.467 [cm]

The derived quantity mass weighted mean diameter (Dm) is based on the relation:

Dm(Zdr) = 1.619*(Zdr)^(0.485) [mm]

The derived quantity rain rate (RR) is based on the relation:

RR(Zh,Zdr) = 0.0067*(Zh)^(0.927)*10^(-0.3433*Zdr) [mm/hr]

The derived quantity LWC is based on the following relations:

LWC(Zh) = 0.00344*(Zh)^(4/7) [gm/m^3]

LWC(Zh,Zdr) = c*(Zh)^a*10^(b*Zdr) [gm/m^3] ; a=0.886, b=0.4159, c=0.0007

LWC(Kdp) = 0.34*(Kdp*10.0)^(0.702)

Time Cross Sections of raw and derived S-Pol data in radar coordinates (17-19 UTC)

1. No averaging (height, range, or azimuth) of S-pol measurements (data represents the closest pixel to the profiler site with az distance = 0.66 km and range distance = 0.15 km: total sample volume is about 0.064 km^3).

2. Averaging 4 gates in range only of S-pol measurements (sample volume is approximately a cube with dimensions of about 0.66 km on a side = 0.257 km^3). The sample volume is a factor of 4 bigger than (1).

3. Averaging 10 gates in range and 2 gates in azimuth of S-pol measurements (sample volume is approximately a cube with dimensions of about 1.3 km on a side = 2.57 km^3). The sample volume is a factor of 40 bigger than (1).

 

 

 

 

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