EAGER: Polarimetric-Raman Lidar for Tropospheric Ice and Liquid Water Fractions

拉曼光谱通过分子系统的振动、旋转和低频模式的非弹性散射来探测物质的化学和物理状态。在大气中，最丰富的拉曼散射体之一是水，在它的冰、液体和蒸气相中，以及在它们的混合物中。这项急切的奖项旨在提高拉曼光谱与偏振激光雷达(光探测和测距)相结合的可行性，以远程绘制对流层气溶胶和云层中水相的比例。这一建议符合一个或多个迫切的标准，因为这项工作是探索性的，而且使用理论上能够达到必要的高光谱分辨率的近红外傅里叶变换光谱仪(FTS)的特殊方法在这种配置下基本上没有经过测试。FTS在高背景光条件下(如白天或黄昏)表现令人满意的能力可能是提案风险的主要因素。

Raman spectroscopy probes the chemical and physical states of matter through inelastic scattering from the vibrational rotational and low frequency modes of molecular systems. In the atmosphere, one of the most abundant Raman scatterers is water, in its ice, liquid and vapour phases, and in their admixture. This EAGER award seeks to improve the feasibility of Raman spectroscopy combined with polarimetric Lidar (light detection and ranging) to remotely profile the fraction of water phases in tropospheric aerosols and cloud layers. This proposal meets one or more of the EAGER criteria because the work is exploratory in nature and the particular approach, using a near IR Fourier Transform Spectrometer (FTS) theoretically capable of the requisite high spectral resolution, is largely untested in this configuration. The ability of the FTS to perform satisfactorily under high background light conditions (e.g. daylight or twilight) is likely to be a main element of proposal risk.