Table S2.docx

For samples collected on Tuoji Island, the contents of TPM, POC and TN ranged from 14 to 410 μg·m^-3, 2.3 to 11.9% and 0.33 to 9.53% (dry wt.), with average values of 81±55 μg·m^-3, 5.3±1.5% and 2.77±2.01% (<i>n </i>= 113), respectively. Calculated C/N molar ratios ranged widely from 0.6 to 19.9, with some higher values found in the fall and spring . The TMP and POC contents of aerosols collected during the cruise ranged from 10-150 μg·m^-3 and 1.9-6.8% and showed less variation than those from Tuoji Island . The TN content was very low and below the detection limit for most samples.The POC δ¹³C and D¹⁴C values ranged from -18.8‰ to -27.0‰ (mean -24.5 ± 1.3‰) and -150‰ to -640‰ (mean -400 ± 107‰) for aerosols collected on Tuoji Island.For the aerosols collected on the cruise, the POC δ¹³C and D¹⁴C values ranged from -25.0‰ to -29.0‰ (mean -27.9±1.0‰) and -357‰ to -892‰ (mean -566±157‰), respectively, and these aerosol particles had more depleted δ¹³C and much older ¹⁴C ages (3,480-17,780 years BP; mean 6,700 ± 1,306 years BP) than particles collected on Tuoji Island .