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

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

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number114060
JournalMarine Pollution Bulletin
Publication statusPublished - 2022 Oct


  • Aragonite saturation
  • Arctic Ocean
  • Atmospheric circulation
  • Beaufort gyre
  • Ocean acidification
  • Pacific-Arctic regions

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science
  • Pollution


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