How can you interpreted the OC/EC ratio in relation to absorption/scattering properties of aerosols?

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Emmanuel Olaoluwa Eresanya

Try and go through the attached PDF, it may be of help

Omar Ramírez Hernández

Hi Emmanuel, thanks for the attached PDF. However, the file is a reply to a referee concept, so I do not know the context of the answers. It would be interesting to know your paper when it is published.

Hi Upal, thank you very much for the paper, it's very interesting. I did not know it and I see it presents relevant data.

Harry ten Brink

There is more than OC and EC in the aerosol

As for the optical properties search google scholar for all the work of prof Mark Z Jacobson Stanford University

Rudra P Pokhrel

I hope this paper will help you to find your answers

http://www.atmos-chem-phys.net/16/9549/2016/

Hi Rudra, thank you for the paper, It´s very relevant.

Harry, thanks. I will look for papers by Mark Z Jacobson.

Omar

After studying the references we gave you, what is your conclusion?

Harry, just a preliminary and general idea: considering the absorption and scattering properties of EC and OC, respectively, It is possible to use the EC/OC ratio to analyze not only the origin of these aerosols, but also their implications for climate forcing. Thus, high values would indicate the predominance of EC and atmospheric absorption conditions. Low values (less than 1) could indicate high concentrations of OC and predominance of atmospheric scattering conditions.

There is more than OC that scatters light: inorganic compounds like ammonium sulphate. Also EC scatters light

Harry, what is your opinion about the effective carbon ratio proposed by Safai et al? What are the advantages and disadvantages? (I attached the paper)

This is a very limited study in the town of Pune in India with references to publications of the same study of the same author in other journals

ECR is based on Pune and does not hold for other regions with much higher EC due to for instance the high use of diesel cars

I share a paper about the characteristics and temporal variations of OC and EC aerosols in a high-altitude, tropical Latin American megacity:

https://www.sciencedirect.com/science/article/pii/S0169809517309109