DOI: 10.1002/2017JD027909
Scopus记录号: 2-s2.0-85041891353
论文题名: Snowflake Melting Simulation Using Smoothed Particle Hydrodynamics
作者: Leinonen J. ; vonLerber A.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 3 起始页码: 1811
结束页码: 1825
语种: 英语
英文关键词: melting layer
; microphysics
; precipitation
; smoothed particle hydrodynamics
; snowflakes
英文摘要: Motivated by the need to understand the microphysics and improve the remote sensing of the melting layer of precipitation, we have developed a numerical 3-D model for the melting of single snowflakes. The model uses the smoothed particle hydrodynamics method and is forced by surface tension that controls the flow of meltwater on the ice surface. Heat transfer from the environment to the snowflake is simulated with a Monte Carlo scheme. In model experiments with snowflakes of various sizes and densities, we observed that the meltwater tends to initially gather in concave regions of the snowflake surface. These liquid water regions merge as they grow, and as meltwater is added, they form a shell of liquid around an ice core. This eventually develops into a water drop. The observed features during melting are consistent with experimental findings from earlier research, which suggests that the model is adequate for exploring the physics of snowflake melting. The principal remaining uncertainties arise from the omission of aerodynamic forces from the model. The results suggest that the degree of riming has a significant influence on the melting process: During initial melting, liquid water is apparent on the surface of unrimed or lightly rimed particles, while rime provides a porous structure that can absorb a relatively large amount of meltwater. Riming also strengthens the connections between different parts of the snowflake, making rimed snowflakes less prone to breakup during melting, while unrimed ones break up rather easily. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114477
Appears in Collections: 气候减缓与适应
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作者单位: Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Earth Observation, Finnish Meteorological Institute, Helsinki, Finland; School of Electrical Engineering, Aalto University, Espoo, Finland
Recommended Citation:
Leinonen J.,vonLerber A.. Snowflake Melting Simulation Using Smoothed Particle Hydrodynamics[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(3)