Factors affecting the subsurface aragonite undersaturation layer in the Pacific Arctic region
2022
Mo, Ahra | Kim, Dongseon | Yang, Eun Jin | Jung, Jinyoung | Ko, Young Ho | Kang, Sung-Ho | Cho, Kyoung-Ho | Park, Keyhong | Kim, Tae-Wook
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.
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