Anthropogenic iodine-129 traces the water circulation in the western Arctic
Description
Iodine-129 data and routine data for Arctic research expedition MR21-05C.
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Seawater samples were collected during the Arctic research expedition MR21-05C aboard the R/V Mirai from August 31 to October 21, 2021. A total of 15 surface samples were collected from 15 stations, and 42 samples were collected from 5 depth profile stations for iodine-129 (129I) analysis. The specific sampling locations are shown in Figure 1b. Surface seawater samples were obtained using a pump on the research vessel, sampling at a depth of 4 meters below the ocean surface. Depth profile samples were collected using 12 L Niskin bottles mounted on a CTD/Carousel Water Sampling System. All samples were stored in 1 L polypropylene bottles at room temperature and kept in the dark to minimize potential photochemical reactions of iodine until further analysis at the Micro Analysis Laboratory, Tandem Accelerator (MALT), The University of Tokyo. For the determination of 129I, seawater samples were pretreated using a coprecipitation method (Qi and Matsuzaki, 2022).