Optical properties of atmospheric aerosol using laser tweezers

该项目的目的是研究光与大气气溶胶相互作用对现代气候变化的影响。为此，将从海洋、极地、森林和城市等各种来源收集并提取大气气溶胶样本。光学镊子将被用来捕获单个气溶胶，以便通过观察实验产生的米氏光谱来收集关于它们散射光的方式的信息。通过将该光谱与计算机程序产生的理论米氏光谱进行比较，就可以计算出气溶胶的半径和折射率。计算这些信息可以更好地了解特定类型的气溶胶如何与光相互作用。然后，这些信息可以应用于辐射传输模型，以计算不同大气气溶胶对现代气候变化的贡献。

The aim of the project is to look at the way in which light interacting with atmospheric aerosols has an effect on modern climate change. To do this samples of atmospheric aerosols will be collected from various sources including oceanic, polar, forestry and urban, and extracted. Optical tweezers will be used to trap individual aerosols in order to collect information on the way they scatter light by looking at the Mie spectra produced experimentally. By comparing this spectra to a theoretical Mie spectra produced by a computer programme, it is then possible to calculate the aerosols radius and refractive index. Calculating this information allows for greater understanding on how specific types of aerosols interact with light. This information can then be applied to a radiative transfer model to calculate the contribution of the different atmospheric aerosols, to modern climate change.