[A-OS17] 沿岸域の海洋循環と物質循環

[AOS17-P07] Time-series variations for Gaseous Elemental Mercury (GEM) from northern Pacific to the Arctic Ocean in the Summer to early Autumn of 2022

*永淵 修¹、中澤 暦²、大浦 一貴³、篠塚 賢一⁴、末吉 哲雄⁶、山本 正伸⁵、渡辺 朋亮⁷、三ツ井 亮洸⁷ (1.福岡工業大学　環境科学研究所、2.富山県立大学　環境・社会基盤工学科、3.富山県立大学大学院、4.岐阜大学、5.北海道大学、6.海洋研究開発機構、7.日本インスツルメンツ株式会社)

キーワード：ガス状水銀、海洋境界層、みらい航海、北極海

Measurements of gaseous elemental mercury (GEM) in the marine boundary layer were performed using AM-6F with CVAFS method during MIRAI cruise from 12 August to 29 September 2022. GEM concentrations varied from 0.56 to 2.02 ng/m3 (n=980); the average value (1.01±0.24 ng/m3) was lower than the background range of the Northern Hemisphere (1.5~1.7ng/m3) and corresponded to the background concentrations of the Southern Hemisphere (1.1~1.3 ng/m3). However, each sea area had its own characteristics. The average GEM concentrations in Arctic Sea, Bering Sea and Sea of Okhotsk were 0.89 ± 0.12 ng/m3, 1.07 ± 0.13 ng/m3, 1.40 ± 0.27 ng/m3, respectively. Thus, the concentration tended to decrease as one moved northern sea area.