TY - JOUR
T1 - Turbulence-induced cloud voids
T2 - Observation and interpretation
AU - Karpińska, Katarzyna
AU - Bodenschatz, Jonathan F.E.
AU - Malinowski, Szymon P.
AU - Nowak, Jakub L.
AU - Risius, Steffen
AU - Schmeissner, Tina
AU - Shaw, Raymond A.
AU - Siebert, Holger
AU - Xi, Hengdong
AU - Xu, Haitao
AU - Bodenschatz, Eberhard
N1 - Publisher Copyright:
© Author(s) 2019.
PY - 2019/4/12
Y1 - 2019/4/12
N2 - The phenomenon of "cloud voids", i.e., elongated volumes inside a cloud that are devoid of droplets, was observed with laser sheet photography in clouds at a mountain-top station. Two experimental cases, similar in turbulence conditions yet with diverse droplet size distributions and cloud void prevalence, are reported. A theoretical explanation is proposed based on the study of heavy inertial sedimenting particles inside a Burgers vortex. A general conclusion regarding void appearance is drawn from theoretical analysis. Numerical simulations of polydisperse droplet motion with realistic vortex parameters and Mie scattering visual effects accounted for can explain the presence of voids with sizes similar to that of the observed ones. Clustering and segregation effects in a vortex tube are discussed for reasonable cloud conditions.
AB - The phenomenon of "cloud voids", i.e., elongated volumes inside a cloud that are devoid of droplets, was observed with laser sheet photography in clouds at a mountain-top station. Two experimental cases, similar in turbulence conditions yet with diverse droplet size distributions and cloud void prevalence, are reported. A theoretical explanation is proposed based on the study of heavy inertial sedimenting particles inside a Burgers vortex. A general conclusion regarding void appearance is drawn from theoretical analysis. Numerical simulations of polydisperse droplet motion with realistic vortex parameters and Mie scattering visual effects accounted for can explain the presence of voids with sizes similar to that of the observed ones. Clustering and segregation effects in a vortex tube are discussed for reasonable cloud conditions.
UR - https://www.scopus.com/pages/publications/85064282135
U2 - 10.5194/acp-19-4991-2019
DO - 10.5194/acp-19-4991-2019
M3 - 文章
AN - SCOPUS:85064282135
SN - 1680-7316
VL - 19
SP - 4991
EP - 5003
JO - Atmospheric Chemistry and Physics
JF - Atmospheric Chemistry and Physics
IS - 7
ER -