This is one the statement made by Tami Bond and Robert Bergstrom in the review paper titled ‘Light Absorption by Carbonaceous Particles: An Investigative Review’ published in Aerosol Science and Technology, 2006.
I had chance to present this paper as class seminar in my ‘Atmospheric Aerosol’ class teaching by Dr. Kirk Fuller during this summer. Let me tell you this, “this is one of the best written paper I ever read on carbon aerosols”. It reads very well and has almost all the information you need to know about atmospheric carbon aerosols and their optical properties. Personally, I congratulate and thanks Tami and Robert for putting together this wonderful paper. Below, I will briefly touch some important points from the paper.
Tabulation of optical properties needs update and measured absorptive properties demonstrate variability that has not been represented in climate models.
Optical properties of Light Absorbing Carbon (LAC) are necessary to model its effects on climate.
Mass absorption cross-section 7.5±1.2 m2/g at λ=0.55 µm for fresh LAC, this may increase due to coating and decrease due to particle coagulation.
Single scattering albedo: 0.2-0.3 for fresh LAC.
Absorption cross-section may be assumed to depend inversely on wavelength throughout the visible spectrum.
Mie calculation should not be used for fresh LAC but coated sphere type Mie calculation can be used for aged LAC.