Measurements of the complex refractive index of volcanic ash

Thesis

This thesis describes laboratory measurements of the complex refractive index of volcanic ash particles. These measurements are needed to model the radiative impact of volcanic ash, vital for accurate satellite remote sensing. Three experimental methods have been developed, and the results for the complex refractive index and optical properties of a wide range of volcanic ash samples are presented.

Measurements were made of the spectral transmission of radiation through suspend...

Expand abstract

Authors: Reed, B

• DOI: 10.5287/ora-ovjyobr8j
• Type of award: DPhil
• Level of award: Doctoral
• Awarding institution: University of Oxford
• Keywords: colloid optical properties; Ash; Refractive Index; satellite aerosol measurements; aerosol measurements; Aerosol Refractive Index; Complex Refractive index; aerosol scattering; aerosol properties; reflectance measurements; Aerosol Refractive Index Measurements; colloids; scattering; colloidal reflectance; satellite sensing; Becke line; satellite measurements; Aerosol detection; ash measurements; Becke line method; volcanic ash measurements; Volcanic Ash; Fourier Transform Spectroscopy; Becke; aerosol remote sensing; optical measurements; Remote Sensing; Aerosols; Aerosol optical properties
• Subjects: volcanic ash complex refractive index; ash refractive index; volcanic ash refractive index; Aerosols; ash remote sensing; Aerosol optical properties; Complex refractive Index; aerosol detection; colloid optical properties; volcanic ash detection; satellite measurements; aerosol scattering; colloidal reflectance; ash detection; Volcanic ash; Aerosol refractive index; Colloids; colloid reflectance; Remote sensing; Volcanic ash measurements; Becke; ash complex refractive index; Aerosol complex refractive index; Becke line; Refractive Index; satellite volcanic ash measurements; scattering; colloid reflectance measurements; Volcanic ash properties; satellite aerosol measurements; Refractive index--Measurement; volcanic ash remote sensing; Becke line method; aerosol remote sensing; Aerosol measurement