Predicting Real Refractive Index of Organic Aerosols From Elemental Composition

Author:

Li Yaowei1ORCID,Bai Bin2ORCID,Dykema John1ORCID,Shin Nara2,Lambe Andrew T.3,Chen Qi4ORCID,Kuwata Mikinori5ORCID,Ng Nga Lee267ORCID,Keutsch Frank N.189ORCID,Liu Pengfei2ORCID

Affiliation:

1. School of Engineering and Applied Sciences Harvard University Cambridge MA USA

2. School of Earth and Atmospheric Sciences Georgia Institute of Technology Atlanta GA USA

3. Aerodyne Research Inc. Billerica MA USA

4. State Key Joint Laboratory of Environmental Simulation and Pollution Control BIC‐ESAT and IJRC College of Environmental Sciences and Engineering Peking University Beijing China

5. Department of Atmospheric and Oceanic Sciences and Laboratory for Climate and Ocean‐Atmosphere Studies School of Physics Peking University Beijing China

6. School of Chemical and Biomolecular Engineering Georgia Institute of Technology Atlanta GA USA

7. School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta GA USA

8. Department of Chemistry and Chemical Biology Harvard University Cambridge MA USA

9. Department of Earth and Planetary Sciences Harvard University Cambridge MA USA

Abstract

AbstractAccurate estimates of aerosol refractive index (RI) are critical for modeling aerosol‐radiation interaction, yet this information is limited for ambient organic aerosols, leading to large uncertainties in estimating aerosol radiative effects. We present a semi‐empirical model that predicts the real RI n of organic aerosol material from its widely measured oxygen‐to‐carbon (O:C) and hydrogen‐to‐carbon (H:C) elemental ratios. The model was based on the theoretical framework of Lorenz‐Lorentz equation and trained with n‐values at 589 nm () of 160 pure compounds. The predictions can be expanded to predict n‐values in a wide spectrum between 300 and 1,200 nm. The model was validated with newly measured and literature datasets of n‐values for laboratory secondary organic aerosol (SOA) materials. Uncertainties of predictions for all SOA samples are within 5%. The model suggests that ‐values of organic aerosols may vary within a relatively small range for typical O:C and H:C values observed in the atmosphere.

Funder

National Aeronautics and Space Administration

National Science Foundation

Publisher

American Geophysical Union (AGU)

Subject

General Earth and Planetary Sciences,Geophysics

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