Image-based observation of aerosol hygroscopic growth and extinction coefficient reversal at three wavelengths, supported by Köhler theory simulations.

Juhyeon Sim¹, Juseon Shin¹, Yunki Mun¹, Naghmeh Dehkhoda¹, Sohee Joo¹, Dukhyeon Kim², Youngmin Noh¹

¹Division of Earth and Environmental System Science, Pukyong National University, Busan, 48513, Republic of Korea. nym@pknu.ac.kr.

²School of Basic Science, Hanbat National University, Daejeon, 34158, Republic of Korea.

PubMed DOI

Abstract

As relative humidity (RH) increases, aerosols take up water and grow. This changes their size and refractive index, affecting light scattering and absorption. Such changes can bias comparisons between remote sensing and in situ measurements. We simulated hygroscopic growth effects on extinction coefficients and the Ångström exponent (AE) at 459, 534, and 600 nm using Köhler-Mie theory. Ammonium su…

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