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| projects:spocc [2025/09/03 11:58] – kathrin | projects:spocc [2026/06/03 17:36] (current) – ayush | ||
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| **Figure 1:** Time-height cross-section of LDR as observed at Cabauw on 03 Nov 2014 20:00. | **Figure 1:** Time-height cross-section of LDR as observed at Cabauw on 03 Nov 2014 20:00. | ||
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| The decrease of LDR between cloud top and base indicates a transition in particle shape, which is in the following evaluated based on the spectrally resolved retrieval technique. After correction for aliasing (Doppler folding) effects we obtain for each height level of 30 m the Doppler spectra of differential reflectivity ZDR and correlation coefficient RHV as a function of the elevation angle from 30° to 90° (zenith-pointing). | The decrease of LDR between cloud top and base indicates a transition in particle shape, which is in the following evaluated based on the spectrally resolved retrieval technique. After correction for aliasing (Doppler folding) effects we obtain for each height level of 30 m the Doppler spectra of differential reflectivity ZDR and correlation coefficient RHV as a function of the elevation angle from 30° to 90° (zenith-pointing). | ||
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| **Figure 2:** ZDR and RHV at height=2900m for a RHI scan from 30 to 90° elevation angle. | **Figure 2:** ZDR and RHV at height=2900m for a RHI scan from 30 to 90° elevation angle. | ||
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| It can be seen that ZDR and RHV behave differently for different elevation angles and velocities. For velocities close to 0 m/s, the ZDR spectrogram shows increased values of up to 3 dB for low elevation angles. Also the RHV values are generally lower at the slow falling velocities. Therefore, a first conclusion is that particles with slowest fall speed have different shapes compared to the particles with faster fall speeds. Using the spectrally resolved retrieval approach, the spectrogram is therefore split into 5 parts (see Fig. 4) in order to quantify the particle shape and orientation as a function of Doppler velocity. | It can be seen that ZDR and RHV behave differently for different elevation angles and velocities. For velocities close to 0 m/s, the ZDR spectrogram shows increased values of up to 3 dB for low elevation angles. Also the RHV values are generally lower at the slow falling velocities. Therefore, a first conclusion is that particles with slowest fall speed have different shapes compared to the particles with faster fall speeds. Using the spectrally resolved retrieval approach, the spectrogram is therefore split into 5 parts (see Fig. 4) in order to quantify the particle shape and orientation as a function of Doppler velocity. | ||