Spectrum Width
The width of the Doppler power spectrum can tell us more about the scatterers:
The spread of the Doppler power spectrum, referred to as the spectral width, is found by computing the variance. The spectral width depends on:
- the spread, range of terminal fall
speeds of the scatterers (more pronounced for
rain than for snow)
- spectra for rain
- spectra for snow
- turbulence of the air (upper levels in severe convection)
- vertical wind shear (e.g., along a gust front)
- antenna motion
Then, the total spectral width is due to the sum of the aforementioned effects:
Example of what happens when the spectral width is large....
