Mixing state and distribution of iodine-containing particles in Arctic Ocean during summertime

• Published in: Science of The Total Environment
• Main Authors: Wang, Longquan, Yan, Jingpei, Saiz-Lopez, A., Jiang, Bei, Yue, Fange, Yu, Xiawei, Xie, Zhouqing
• Other Authors: National Natural Science Foundation of China
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Elsevier 2022
• Subjects: Arctic Ocean; Iodine chemistry; Single particle; Sea ice; Diurnal trends; Antarctic; Arctic; Antarc*
• Online Access: http://hdl.handle.net/10261/280314; https://doi.org/10.1016/j.scitotenv.2022.155030; https://doi.org/10.13039/501100001809

10 pags., 6 figs., 1 tab. Iodine chemistry plays a key role in ozone destruction and new aerosol formation in the marine boundary layer (MBL), especially in polar regions. We investigated iodine-containing particles (0.2-2 μm) in the Arctic Ocean using a ship-based single particle aerosol mass spectrometer from July to August 2017. Seven main particle types were identified: dust, biomass combustion particles, sea salt, organic S, aromatics, hydrocarbon-like compounds, and amines. The number fraction of iodine-containing particles was higher inside the Arctic Circle (>65°N) than outside (55–65°N). According to the air mass back trajectories, the latitudinal distribution of iodine-containing particles can be mainly attributed to iodine emissions from the sea ice edge region. Diurnal trends were found, especially during the second half of cruise, with peak iodine-containing particle number fractions during low-light conditions and relatively low number fractions at midday. These results imply that solar radiation plays a significant role in modulating particulate iodine in the Arctic atmosphere. This work was supported by the National Natural Science Foundation of China (NSFC) (41941014). We thank China Arctic and Antarctic Adminis- tration for fieldwork support.