Climate‐Driven Fluctuations in Anthropogenic CO2 Uptake by the East Sea in the North Pacific Ocean

Abstract Ocean ventilation is a key mechanism for transporting anthropogenic CO2 (CANTH) from the ocean surface toward its interior. We investigated the link between ocean ventilation and CANTH increase in the East Sea using data from surveys conducted in 1992, 1999, 2007, and 2019. Between 1992 and...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: So‐Yun Kim, Kitack Lee, Tongsup Lee, Ja‐Myung Kim, In‐Seong Han
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2023
Subjects:
anthropogenic CO2
carbon dioxide
carbon uptake
climate variability
Arctic Oscillation
East Sea
Geophysics. Cosmic physics
QC801-809
Arctic
Pacific
Online Access:https://doi.org/10.1029/2023GL105819
https://doaj.org/article/ae24004a2c174a0385524a01fc2e6bcc
Description
Summary:Abstract Ocean ventilation is a key mechanism for transporting anthropogenic CO2 (CANTH) from the ocean surface toward its interior. We investigated the link between ocean ventilation and CANTH increase in the East Sea using data from surveys conducted in 1992, 1999, 2007, and 2019. Between 1992 and 1999, the East Sea Intermediate Water (300−1,500 m) accumulated CANTH at a rate of 0.3 ± 0.1 mol C m−2 yr−1. However, in the subsequent period (1999−2007) this rate decreased to <0.1 ± 0.1 mol C m−2 yr−1. There was a resurgence in the CANTH increase rate between 2007 and 2019, reaching 0.4 ± 0.1 mol C m−2 yr−1. The East Sea Intermediate Water ventilation changes, inferred from the changes in water column O2 level and the Arctic Oscillation‐driven winter surface temperature in the deep water formation region, were responsible for the periodic decline and recovery in CANTH increase.

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