On the Estimation of In‐Cloud Vertical Air Motion Using Radar Doppler Spectra

On the Estimation of In‐Cloud Vertical Air Motion Using Radar Doppler Spectra

Measurements of in‐cloud vertical air motion are key to quantitatively describe cloud dynamics and their role in cloud microphysics. Here, a retrieval technique for estimating the in‐cloud vertical air motion using the upward edge of the radar Doppler spectrum is presented. An additional broadening...

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Veröffentlicht in:Geophysical research letters 2021-01, Vol.48 (1), p.n/a
Hauptverfasser: Zhu, Zeen, Kollias, Pavlos, Yang, Fan, Luke, Edward
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Sprache:eng
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cloud dynamics
radar doppler spectra
vertical air motion
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Kollias, Pavlos
Yang, Fan
Luke, Edward
description Measurements of in‐cloud vertical air motion are key to quantitatively describe cloud dynamics and their role in cloud microphysics. Here, a retrieval technique for estimating the in‐cloud vertical air motion using the upward edge of the radar Doppler spectrum is presented. An additional broadening correction factor that depends on the signal‐to‐noise ratio (SNR) is introduced. A variety of independent measurements are used to assess the performance of the new technique. The vertical air motion is unbiased with an uncertainty of 0.2 m s−1 for SNR
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Short‐wavelength radars are capable of detecting and penetrating clouds; however, the use of the Doppler velocity to estimate the vertical air motion is not straightforward, due to the contribution of the particle sedimentation velocity. Here, a previously proposed technique is revisited, and a crucial correction is introduced. The improved retrieval technique provides unbiased vertical air motion estimates with an uncertainty of 0.2 m s−1. The technique is applicable to both stratiform and cumulus clouds with and without precipitation. 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Short‐wavelength radars are capable of detecting and penetrating clouds; however, the use of the Doppler velocity to estimate the vertical air motion is not straightforward, due to the contribution of the particle sedimentation velocity. Here, a previously proposed technique is revisited, and a crucial correction is introduced. The improved retrieval technique provides unbiased vertical air motion estimates with an uncertainty of 0.2 m s−1. The technique is applicable to both stratiform and cumulus clouds with and without precipitation. 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subjects cloud dynamics
radar doppler spectra
vertical air motion
title On the Estimation of In‐Cloud Vertical Air Motion Using Radar Doppler Spectra
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