The Fall Speed Variability of Similarly Sized Ice Particle AggregatesSource: Journal of Applied Meteorology and Climatology:;2019:;volume 058:;issue 008::page 1751Author:Schmitt, Carl G.
,
Sulia, Kara
,
Lebo, Zachary J.
,
Heymsfield, Andrew J.
,
Przybyo, Vanessa
,
Connolly, Paul
DOI: 10.1175/JAMC-D-18-0291.1Publisher: American Meteorological Society
Abstract: AbstractThe terminal velocity (Vt) of ice hydrometeors is of high importance to atmospheric modeling. Vt is governed by the physical characteristics of a hydrometeor, including mass and projected area, as well as environmental conditions. When liquid hydrometeors coalesce to form larger hydrometeors, the resulting hydrometeor can readily be characterized by its spherical or near-spherical shape. For ice hydrometeors, it is more complicated because of the variability of ice shapes possible in the atmosphere as well as the inherent randomness in the aggregation process, which leads to highly variable characteristics. The abundance of atmospheric processes affecting ice particle dimensional characteristics creates potential for highly variable Vt for ice particles that are predicted or measured to be of the ?same size.? In this article we explore the variability of ice hydrometeor Vt both theoretically and through the use of experimental observations. Theoretically, the variability in Vt is investigated by analyzing the microphysical characteristics of randomly aggregated hexagonal shapes. The modeled dimensional characteristics are then compared to aircraft probe measurements to constrain the variability in atmospheric ice hydrometeor Vt. Results show that the spread in Vt can be represented with Gaussian distributions relative to a mean. Variability expressed as the full width at half maximum of the normalized Gaussian probability distribution function is around 20%, with somewhat higher values associated with larger particle sizes and warmer temperatures. Field campaigns where mostly convective clouds were sampled displayed low variability, while Arctic and midlatitude winter campaigns showed broader Vt spectra.
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contributor author | Schmitt, Carl G. | |
contributor author | Sulia, Kara | |
contributor author | Lebo, Zachary J. | |
contributor author | Heymsfield, Andrew J. | |
contributor author | Przybyo, Vanessa | |
contributor author | Connolly, Paul | |
date accessioned | 2019-10-05T06:50:01Z | |
date available | 2019-10-05T06:50:01Z | |
date copyright | 6/18/2019 12:00:00 AM | |
date issued | 2019 | |
identifier other | JAMC-D-18-0291.1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4263564 | |
description abstract | AbstractThe terminal velocity (Vt) of ice hydrometeors is of high importance to atmospheric modeling. Vt is governed by the physical characteristics of a hydrometeor, including mass and projected area, as well as environmental conditions. When liquid hydrometeors coalesce to form larger hydrometeors, the resulting hydrometeor can readily be characterized by its spherical or near-spherical shape. For ice hydrometeors, it is more complicated because of the variability of ice shapes possible in the atmosphere as well as the inherent randomness in the aggregation process, which leads to highly variable characteristics. The abundance of atmospheric processes affecting ice particle dimensional characteristics creates potential for highly variable Vt for ice particles that are predicted or measured to be of the ?same size.? In this article we explore the variability of ice hydrometeor Vt both theoretically and through the use of experimental observations. Theoretically, the variability in Vt is investigated by analyzing the microphysical characteristics of randomly aggregated hexagonal shapes. The modeled dimensional characteristics are then compared to aircraft probe measurements to constrain the variability in atmospheric ice hydrometeor Vt. Results show that the spread in Vt can be represented with Gaussian distributions relative to a mean. Variability expressed as the full width at half maximum of the normalized Gaussian probability distribution function is around 20%, with somewhat higher values associated with larger particle sizes and warmer temperatures. Field campaigns where mostly convective clouds were sampled displayed low variability, while Arctic and midlatitude winter campaigns showed broader Vt spectra. | |
publisher | American Meteorological Society | |
title | The Fall Speed Variability of Similarly Sized Ice Particle Aggregates | |
type | Journal Paper | |
journal volume | 58 | |
journal issue | 8 | |
journal title | Journal of Applied Meteorology and Climatology | |
identifier doi | 10.1175/JAMC-D-18-0291.1 | |
journal fristpage | 1751 | |
journal lastpage | 1761 | |
tree | Journal of Applied Meteorology and Climatology:;2019:;volume 058:;issue 008 | |
contenttype | Fulltext |