Multiple sources of atmospheric CO₂ activated by AMOC recovery at the onset of interglacial MIS 9.

ABSTRACT: Using high-precision ice core measurements of CO₂, δ¹³C-CO₂, CH₄, and N₂O, this study provides carbon isotope constraints on a sizeable, centennial-scale CO₂ jump at the onset of Marine Isotope Stage 9 (MIS 9). The very end of the Heinrich stadial (HS) characterizing Termination IV (T-IV, ca. 343 to 333 ka ago) shows a 250-y-long jump in greenhouse gas concentrations, followed by a 1.3 ka gradual decline back to the initial concentration. During this so-called overshoot, CO₂ and CH₄ reach their highest levels (about 303 ppm and 800 ppb, respectively) over the past 800 ka prior to industrialization. The jump in CO₂ is not accompanied by a change in δ¹³C-CO_2, suggesting th

SUBMITTER: Krauss F 

PROVIDER: S-EPMC12167945 | biostudies-literature | 2025 Jun

REPOSITORIES: biostudies-literature