All four sets of spectra exhibit curvature in log-log space with 2 nd order polynomials providing a better fit to the measured spectra than power law fits. The measurements were obtained at a height of 10 m above the sea surface with an inlet that limited the measured aerosols to diameters ≤ 1.3 µm. Extinction spectra were measured with a custom built instrument (SpEx, 0.8 nm spectral resolution).
Absorption spectra from methanol and deionized water extracts of aerosols collected on Teflon filters were measured in a liquid waveguide capillary cell (World Precision Instruments LWCC-3100, 0.4 nm spectral resolution). Total absorption spectra were obtained from aerosols collected on glass fiber filters and subsequently placed in the center of an integrating sphere (Labsphere DRA-CA-30) attached to a dual beam spectrophotometer (Cary 100 Bio UV-Visible Spectrophotometer, 0.2 nm spectral resolution). Ocean Color (KORUS-OC) cruise around the Korean Peninsula from May 21 through June 3, 2016. In situ aerosol extinction and absorption spectra covering the 300-700 nm range at ≤ 1 nm spectral resolution were measured aboard the R/V Onnuri during the Korea U.S.
