Laboratory Studies of Ice Initiation in Cloud Using the UMR Simulation Facility

9301844白色 将进行实验室实验，研究在大气云特有的受控热力学条件下冰的形成。 注意力将集中在发生在侵蚀炮塔或云边缘的过冷云的蒸发上。 本文通过实验研究了云滴蒸发残留物的冰成核能力，并推断了它们在中等过冷度（-5 ~-15 ℃）下大量冰晶形成中的作用。 模拟室将被用来进行实验室产生的硫酸铵气溶胶和天然气溶胶的膨胀-压缩循环的系统继承，这将隔离的非均质沉积部分的蒸发云滴的残留物上的冰成核。 ***

9301844 White Laboratory experiments will be undertaken to investigate the formation of ice under controlled thermodynamic conditions characteristic of atmospheric clouds. Attention will be focussed on the evaporation of supercooled cloud that takes place in eroding turrets or at cloud edges. Experiments are proposed to evaluate the ice nucleating capability of the evaporated residues of cloud drops and deduce their role in the production of large numbers of ice crystals at moderate (-5 to -15C) supercoolings. The simulation chamber will be used to subject both laboratory-produced ammonium sulfate aerosol and natural aerosol to a systematic succession of expansion-compression cycles that will isolate the heterogeneous deposition portion of ice nucleation on the residues of evaporated cloud drops. ***