Articles | Volume 11, issue 3
https://doi.org/10.5194/amt-11-1377-2018
https://doi.org/10.5194/amt-11-1377-2018
Research article
 | 
08 Mar 2018
Research article |  | 08 Mar 2018

Raindrop fall velocities from an optical array probe and 2-D video disdrometer

Viswanathan Bringi, Merhala Thurai, and Darrel Baumgardner

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Cited articles

Atlas, D., Srivastava, R. C., and Sekhon, R. S.:. Doppler radar characteristics of precipitation at vertical incidence, Rev. Geophys., 11, 1–35, https://doi.org/10.1029/RG011i001p00001, 1973. 
Barthazy, E., Göke, S., Schefold, R., and Högl, D.: An optical array instrument for shape and fall velocity measurements of hydrometeors, J. Atmos. Ocean. Tech., 21, 1400–1416, https://doi.org/10.1175/1520-0426(2004)021<1400:AOAIFS>2.0.CO;2, 2004. 
Baumgardner, D., Abel, S., Axisa, D., Cotton, R., Crosier, J., Field, P., Gurganus, C., Heymsfield, A., Korolev, A., Krämer, M., Lawson, P., McFarquhar, G., Ulanowski, J. Z., and Shik Um, J.: Chapter 9: Cloud Ice Properties – In Situ Measurement Challenges, in: AMS Monograph on Ice Formation and Evolution in Clouds and Precipitation: Measurement and Modeling Challenges, edited by: Baumgardner, D., McFarquhar, G., and Heymsfield, A., American Meteorological Society, Boston, MA, 2016. 
Beard, K. V.: Terminal velocity and shape of cloud and precipitation drops aloft, J. Atmos. Sci., 33, 851–864, https://doi.org/10.1175/1520-0469(1976)033<0851:TVASOC>2.0.CO;2, 1976. 
Beard, K. V. and Pruppacher, H. R.: A determination of the terminal velocity and drag of small water drops by means of a wind tunnel, J. Atmos. Sci., 26, 1066–1072, https://doi.org/10.1175/1520-0469(1969)026<1066:ADOTTV>2.0.CO;2, 1969. 
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Short summary
Raindrop fall velocities are important for rain rate estimation, soil erosion studies and in numerical modelling of rain formation in clouds. The assumption that the fall velocity is uniquely related to drop size is made inherently based on laboratory measurements under still air conditions from nearly 68 years ago. There have been very few measurements of drop fall speeds in natural rain under both still and turbulent wind conditions. We report on fall speed measurements in natural rain shafts.