Articles | Volume 25, issue 11
https://doi.org/10.5194/acp-25-5761-2025
https://doi.org/10.5194/acp-25-5761-2025
Research article
 | 
11 Jun 2025
Research article |  | 11 Jun 2025

Insights into the real part of natural sea spray aerosol refractive index in the Pacific Ocean

Chengyi Fan, Bishuo He, Shuqi Guo, Jie Qiu, and Chunsheng Zhao

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A Universal Aerosol Composition Analysis Method for Optical Tweezers Measurement and Its Application to Determine Hygroscopic Growth Factor of Single-particle Aerosol
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EGUsphere, https://doi.org/10.5194/egusphere-2025-5150,https://doi.org/10.5194/egusphere-2025-5150, 2025
This preprint is open for discussion and under review for Atmospheric Measurement Techniques (AMT).
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Cited articles

Aldhaif, A. M., Stahl, C., Braun, R. A., Moghaddam, M. A., Shingler, T., Crosbie, E., Sawamura, P., Dadashazar, H., Ziemba, L., Jimenez, J. L., Campuzano-Jost, P., and Sorooshian, A.: Characterization of the Real Part of Dry Aerosol Refractive Index Over North America From the Surface to 12 km, J. Geophys. Res.-Atmos., 123, 8283–8300, https://doi.org/10.1029/2018JD028504, 2018. 
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Benner, R. E., Barber, P. W., Owen, J. F., and Chang, R. K.: Observation of Structure Resonances in the Fluorescence Spectra from Microspheres, Phys. Rev. Lett., 44, 475–478, https://doi.org/10.1103/PhysRevLett.44.475, 1980. 
Cai, C. and Zhao, C.: Optical levitation measurement on hygroscopic behaviour and SVOC vapour pressure of single organic/inorganic aqueous aerosol, Atmos. Environ., 189, 50–60, https://doi.org/10.1016/j.atmosenv.2018.06.040, 2018. 
Cai, C., Miles, R. E. H., Cotterell, M. I., Marsh, A., Rovelli, G., Rickards, A. M. J., Zhang, Y., and Reid, J. P.: Comparison of Methods for Predicting the Compositional Dependence of the Density and Refractive Index of Organic–Aqueous Aerosols, J. Phys. Chem. A, 120, 6604–6617, https://doi.org/10.1021/acs.jpca.6b05986, 2016. 
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Marine aerosols play a critical role in weather and climate, and their real part of the refractive index (RRI) is a key factor in their radiative effects. We present a study of RRI measurements using optical tweezer technology and find that the calculated results of RRI using the traditional method disagree with the measurements. A parameterization of the RRI and relative humidity relationship is proposed, and it will improve the radiation calculation in numerical models.
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