Differential phase Z_DP is used to estimate which aspect of precipitation?

Differential phase Z_DP is used to estimate which aspect of precipitation?

• A. Drop phase information.
• B. Wind speed.
• C. Temperature.
• D. Humidity.

Answer: (A)

Differential phase, Z_DP, is about how the horizontal and vertical components of the radar wave accumulate phase as they pass through precipitation. Droplets aren’t perfect spheres, and their shapes and internal structure affect the phase of the scattered wave differently for each polarization. The difference in phase between the two polarizations along the path—what Z_DP measures—gives you information about the drop phase, the actual phase state of the raindrops. That’s why Z_DP is used to estimate drop phase information. Wind speed would come from Doppler velocity, while temperature and humidity are thermodynamic properties not determined by this radar phase signal, so they aren’t what Z_DP directly reveals.

Differential phase, Z_DP, is about how the horizontal and vertical components of the radar wave accumulate phase as they pass through precipitation. Droplets aren’t perfect spheres, and their shapes and internal structure affect the phase of the scattered wave differently for each polarization. The difference in phase between the two polarizations along the path—what Z_DP measures—gives you information about the drop phase, the actual phase state of the raindrops. That’s why Z_DP is used to estimate drop phase information.

Wind speed would come from Doppler velocity, while temperature and humidity are thermodynamic properties not determined by this radar phase signal, so they aren’t what Z_DP directly reveals.