講演情報
[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.