An international team of scientists has developed a 3D numerical model for the melting of individual snowflakes. A better understanding of how snow melts can help researchers identify the signature in radar signals from stronger, wet snow, and could be a step toward improving the predictions of that danger.
"Rain often starts when snow is higher in the atmosphere where it is colder, the snowflakes melt at temperatures above freezing, the layer of melting snowflakes can affect weather patterns, block radio signals, and more pose a threat to aircraft, "said Jussi Leinonen of the Jet Propulsion Laboratory of NASA and Annakaisa of Lerber of Aalto University and the Finnish Meteorological Institute
" Our study was the first to simulate the melting of snowflakes in 3D, by reproducing the physical processes involved in the computer. "
The team's numerical model reproduces key features of molten snowflakes observed in nature. 19659005] Initially, melt water collects in any concave areas of the surface of the snowflake.
These liquid-water areas then merge into a liquid envelope around an ice core and eventually develop into a drop of water.
The modeled snowflake The image shown in the video is less than 1 cm long and consists of many individual ice crystals, whose arms were entangled in the air during the collision.
 "I was interested in modeling melting snow because it affects our observations with remote sensing instruments," Dr. Leinonen.
"A radar profile of the atmosphere from top to bottom shows a very bright, prominent layer at altitude, where falling snow and hail melt – much brighter than atmospheric layers above and below."
"The reasons for this layer are not very clear yet, and there was a little debate in the community, (19659005) Simpler models can reproduce the bright enamel layer, but a more detailed model like this can help scientists better understand it, especially how the layer interacts with both Melting Snow Matter Related to Radar Wavelengths Used
A publication on the numerical model of the team was published in Journal of Geophysical Research – Atmospheres .
_____  Jussi Leinonen & Annakaisa by Lerber Snowflake Melting Simulation with Smoothed Particle Hydrodynamics. [1 9459012] Journal of Geophysical Research – Atmospheres Published online: February 6, 2018; doi: 10.1002 / 2017JD027909