Contributions of biological and physical dynamics to deglacial CO₂ release from the polar Southern Ocean.

ABSTRACT: As a critical region regulating air-sea gas exchanges, the polar Southern Ocean has important implications for deglacial atmospheric CO₂ rises. However, proxy data evidence is sparse to evaluate the respective roles of Southern Ocean biological and physical dynamics in affecting past air-sea CO₂ exchanges due to longstanding challenges in obtaining carbonate materials to reconstruct surface conditions in this region. Here, we circumvent these challenges by constraining polar Southern Ocean surface-water conditions based on preformed deep-water properties derived from paired carbonate ion-phosphate-oxygenation reconstructions during the last deglaciation. We show that polar Southern Ocean carbon losses coincided with increased deep-ocean preformed nutrient concentratio

SUBMITTER: Dai Y 

PROVIDER: S-EPMC11920233 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature