Vaisala IRIS - Vol_B; Figure 128 VOL_A Task Configuration

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Figure 128 VOL_A task conﬁguration - dual polarization

Polarization Horiz

DP Attn Cor Z ZDR disabled

Proc mode FFT

Measured data moments T, Z, Vel, Width, SQI

F.1.3 VOL_B

The VOL_B task ﬁlls the higher elevations of the hybrid volume providing observations of

standard and dual polarization moments for volume products, such as CAPPI.

The task uses high pulse repetition frequency and delivers high quality radial winds in the

range of +/- 16 m/s. Due to a high pulse repetition frequency, high elevations, and the

modest ranges in use, narrow precipitation spectra are possible. The quality of standard and

dual- polarization moments is good. The hybrid volume data of VOL_B oer inputs for a

variety of meteorological products.

At higher elevation angles:

• The system is less likely to detect second trip echoes or non-meteorological targets and

thus, SQI and PMI thresholding is not used for Z data ﬁelds by default, unlike in VOL_A.

IRIS Product and Display User Guide M211319EN-H

378 RESTRICTED

Vaisala IRIS - Vol_B; Figure 128 VOL_A Task Configuration - Dual Polarization