Evidence of preferential sweeping during snow settling in atmospheric turbulence
Evidence of preferential sweeping during snow settling in atmospheric turbulence
复制标题
大气湍流中积雪沉降期间优先清扫的证据
DOI:
10.1017/jfm.2021.816
复制
发表时间:
2021
影响因子:
3.7
通讯作者:
Hong, Jiarong
中科院分区:
文献类型:
--
作者:
Li, Jiaqi;Abraham, Aliza;Guala, Michele;Hong, Jiarong
We present a field study of snow settling dynamics based on simultaneous measurements of the atmospheric flow field and snow particle trajectories. Specifically, a super-large-scale particle image velocimetry (SLPIV) system using natural snow particles as tracers is deployed to quantify the velocity field and identify vortex structures in a 22 m 5 m sample area within the SLPIV using particle tracking velocimetry. The results reveal the direct linkage among vortex structures in atmospheric turbulence, the spatial distribution of snow particle concentration and their settling dynamics. In particular, with snow turbulence interaction at near-critical Stokes number, the settling velocity enhancement of snow particles is multifold, and larger than what has been observed in previous field studies. Super-large-scale particle image velocimetry measurements show a higher concentration of snow particles preferentially located on the downward side of the vortices identified in the atmospheric flow field. Particle tracking velocimetry, performed on high resolution images around the reconstructed vortices, confirms the latter trend and provides statistical evidence of the acceleration of snow particles, as they move toward the downward side of vortices. Overall, the simultaneous multi-scale particle imaging presented here enables us to directly quantify the salient features of preferential sweeping, supporting it as an underlying mechanism of snow settling enhancement in the atmospheric surface layer.
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影响因子:
3.7
作者:
Teja Dasari;Yue Wu;Yun Liu;Jiarong Hong
通讯作者:
Jiarong Hong
影响因子:
5.2
作者:
Till Zeugin;Quirine Krol;I. Fouxon;M. Holzner
通讯作者:
M. Holzner
DOI:
--
发表时间:
2019
期刊:
影响因子:
--
作者:
E. Dunnavan;Zhiyuan Jiang;J. Harrington;J. Verlinde;Kyle E. Fitch;T. Garrett
通讯作者:
T. Garrett
DOI:
--
发表时间:
1977
期刊:
影响因子:
--
作者:
Paul Tooby;G. Wick;J. Isaacs
通讯作者:
J. Isaacs
影响因子:
1.9
作者:
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通讯作者:
G. Nathan