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Counting and Phase Function Measurements with the LONSCAPE Instrument to Determine Physical Properties of Aerosols in Ice Giant Planet Atmospheres
Space Science Reviews ( IF 10.3 ) Pub Date : 2020-03-01 , DOI: 10.1007/s11214-020-00653-2
Jean-Baptiste Renard , Olivier Mousis , Pascal Rannou , Anny-Chantal Levasseur-Regourd , Gwenaël Berthet , Jean-Michel Geffrin , Edith Hadamcik , Nicolas Verdier , Aude-Lyse Millet , Daniel Daugeron

Measurements of light scattered by particles give insight into their physical properties (solid or liquid, size, shape, complex refractive index). We propose a novel instrument that provides in situ optical light-scattering measurements of aerosols in giant planet atmospheres, particularly in the ice giants Uranus and Neptune. Known as LONSCAPE (Light Optical Nephelometer Sizer and Counter for Aerosols for Planetary Environments), the instrument combines the particle counting technique of the LOAC balloon-borne aerosol counter with the well-known nephelometer technique to retrieve both the concentrations and phase functions of aerosols over 20 size classes in the 0.2–50 μm diameter size range. Such measurements allow us to distinguish between liquid, ice and solid (potentially carbonaceous) particles for all size classes, and thus to constrain the aerosols composition and their formation process. Given its low mass, size, and power requirements, LONSCAPE could become one of the key instruments selected to be part of the science payload of an atmospheric entry probe sent to the ice giants in the 2030s.

中文翻译:

使用 LONSCAPE 仪器进行计数和相函数测量,以确定冰巨行星大气中气溶胶的物理特性

测量粒子散射的光可以深入了解它们的物理特性(固体或液体、大小、形状、复折射率)。我们提出了一种新型仪器,可以对巨行星大气中的气溶胶进行原位光学光散射测量,特别是在冰巨行星天王星和海王星中。该仪器被称为 LONSCAPE(用于行星环境的气溶胶的光光学浊度计分级器和计数器),结合了 LOAC 气球携带气溶胶计数器的粒子计数技术和众所周知的浊度计技术,以检索气溶胶的浓度和相位函数。在 0.2-50 μm 直径尺寸范围内的 20 个尺寸等级。这样的测量使我们能够区分所有尺寸等级的液体、冰和固体(可能是碳质)颗粒,从而限制气溶胶成分及其形成过程。鉴于其质量、尺寸和功率要求低,LONSCAPE 可能成为被选为 2030 年代发送给冰巨星的大气进入探测器科学有效载荷一部分的关键仪器之一。
更新日期:2020-03-01
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