Decreased Air‐Sea CO2 ${\mathbf{\text{CO}}}_{\mathbf{2}}$ Flux During the Persistent Marine Heatwaves in the Yellow Sea and East China Sea

Marine heatwaves (MHWs) exert a significant influence on marine ecosystem, especially in marginal seas where carbonate processes are intricately linked to temperature variations. However, how MHWs affect the carbonate processes in marginal seas, such as the Yellow Sea (YS) and East China Sea (ECS), remains unclear. Here, we employ a physical‐biogeochemical model to simulate marine ecosystem, aiming to systematically quantify impacts of persistent MHWs (PMHWs) on air‐sea flux () anomaly in YS and ECS. Results reveal that due to reduced wind speed and elevated temperature during PMHWs, ocean reservoir experiences dramatic decrease. In summer when the ocean releases CO2 to the atmosphere, suppressed ocean CO2 outgassing induced by decreased wind speed counteracts elevated ocean CO2 outgassing resulted from high temperature. In winter, both wind speed and temperature factors suppress ocean CO2 absorption from the atmosphere to the ocean. In addition, the spatial pattern of is dominated by partial pressure of in the surface water (). While thermal effects have a contribution of 61% and 33% in YS and ECS to positive anomaly, non‐thermal effects primarily driven by alkalinity anomaly play a more vital role in amplifying anomaly (61% and 90% respectively). Furthermore, horizontal advection emerges as a dominant ocean process in modulating variations in YS and ECS, with the contribution of 72 ± 17% and 75 ± 60% respectively. These findings underscore the importance of understanding the physical mechanisms behind PMHWs in analyzing its ecological impacts within coastal ocean environments.

• Publication year

  2025

• Venue

  Journal of Geophysical Research: Oceans

• Publication date

  2025-04-01

• Fields of study

  Not labeled

• Identifiers
  DOI 10.1029/2024jc021525
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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