Fall speed measurement and high-resolution multi-angle photography of hydrometeors in free fall

被引：117

作者：

Garrett, T. J. ^{[1
]}

Fallgatter, C. ^{[1
]}

Shkurko, K. ^{[1
]}

Howlett, D. ^{[2
]}

机构：

[1] Univ Utah, Dept Atmospher Sci, Salt Lake City, UT 84112 USA

[2] Alta Ctr Snow Sci, Alta, UT USA

来源：

ATMOSPHERIC MEASUREMENT TECHNIQUES | 2012年 / 5卷 / 11期

基金：

美国国家科学基金会;

关键词：

2001; IMPROVE-2; EVENT; VIDEO DISDROMETER; ICE PARTICLES; PART II; PRECIPITATION; SNOW; SNOWFLAKES; SCATTERING; MODEL; VELOCITY;

D O I：

10.5194/amt-5-2625-2012

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

We describe here a new instrument for imaging hydrometeors in free fall. The Multi-Angle Snowflake Camera (MASC) captures high-resolution photographs of hydrometeors from three angles while simultaneously measuring their fall speed. Based on the stereoscopic photographs captured over the two months of continuous measurements obtained at a high altitude location within the Wasatch Front in Utah, we derive statistics for fall speed, hydrometeor size, shape, orientation and aspect ratio. From a selection of the photographed hydrometeors, an illustration is provided for how the instrument might be used for making improved microwave scattering calculations. Complex, aggregated snowflake shapes appear to be more strongly forward scattering, at the expense of reduced back-scatter, than heavily rimed graupel particles of similar size.

引用

页码：2625 / 2633

页数：9

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