Development of a method for measuring complex refractive index of black carbon aerosols

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H05465
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: The University of Tokyo
• Principal Investigator: Moteki Nobuhiro 東京大学, 大学院理学系研究科(理学部), 助教 (20507818)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 大気化学 / 放射強制力 / エアロゾル / 地球温暖化

Outline of Final Research Achievements

In the initial schedule, we plan to simultaneously measure the scattering and absorption cross sections of black carbon particles using the single-particle light scattering method and the single-particle laser incandescence method to derive the complex refractive index of black carbon aerosols. In the course of preliminary experiments, we discovered that anthropogenic iron oxide particles generated from automobiles and steel works can be detected separately from black carbon and iron oxide particles of natural origin, and established a method. Using global observation data and numerical simulation of anthropogenic iron oxide aerosols, we evaluated global concentration and radiative forcing for the first time. In addition, a single particle dissipation method, which is a highly sensitive measurement principle for the imaginary part of the complex refractive index, was devised anew and a theoretical model and experimental system of the measurement were completed.

Free Research Field

エアロゾル