Raindrop shapes and fall velocities in “turbulent times”
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Published:2019-06-11
Issue:
Volume:16
Page:95-101
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ISSN:1992-0636
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Container-title:Advances in Science and Research
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language:en
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Short-container-title:Adv. Sci. Res.
Author:
Thurai Merhala,Schönhuber Michael,Lammer Günter,Bringi Viswanathan
Abstract
Abstract. Raindrop shapes and fall velocities measured by
2-dimensional video disdrometer are presented for 2 high-wind/turbulent
events. The shapes were reconstructed using a relatively new technique. 10 m
height wind sensor data are used to derive proxy-indicators for turbulent
intensities. Our results show strong gusts, directional wind shifts (i.e.
shear) and/or inferred high turbulence intensity are correlated with reduced
fall speeds, reaching values ∼25 %–30 % less than the
expected values, i.e. sub-terminal fall speeds. Significant percentage
(20 %–35 %) of asymmetric drops (> 2 mm) deviating from the most
probable axisymmetric shapes were also detected for some events with high
turbulent intensities.
Funder
Directorate for Geosciences
Publisher
Copernicus GmbH
Subject
Atmospheric Science,Pollution,Geophysics,Ecological Modeling
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