Factors affecting the subsurface aragonite undersaturation layer in the Pacific Arctic region

Mo, Ahra; Kim, Dongseon; Yang, Eun Jin; Jung, Jinyoung; Ko, Young Ho; Kang, Sung-Ho; Cho, Kyoung-Ho; Park, Keyhong; Kim, Tae-Wook

Factors affecting the subsurface aragonite undersaturation layer in the Pacific Arctic region

2022

This study evaluated interannual variation in the subsurface aragonite undersaturation zone (ΩAᵣ<₁ layer) in the Pacific Arctic Ocean, using data from the 2016–2019 period. The upper boundary (DEPΩ<₁ᵁᴮ) of the ΩAᵣ<₁ layer generally formed at a depth where the contribution of corrosive Pacific water was approximately 98 %. The intensity of the Beaufort Gyre associated with freshwater accumulation mainly determined interannual variation in DEPΩ<₁ᵁᴮ, but the direction of its effect was opposite west and east of ~166°W. The lower boundary (DEPΩ<₁ᴸᴮ) of the ΩAᵣ<₁ layer was generally found at a depth range where equal contributions of Pacific and Atlantic water were expected. An Atlantic-origin cold saline water intrusion event in 2017 caused by an anomalous atmospheric circulation pattern significantly lifted the DEPΩ<₁ᴸᴮ, thus the thickness of the ΩAᵣ<₁ layer decreased.

Показать больше [+]