Fig. 4: The seasonal cycle of delta air-sea pCO2 (ΔpCO2) and drivers of surface pCO2 in the Southern Ocean.
From: Projected poleward migration of the Southern Ocean CO2 sink region under high emissions
a–c The seasonal cycle of ΔpCO2 for the ensemble model mean in blue and pCO2-products in black. d–i seasonal cycle of the thermal and nonthermal components of pCO2 changes for present climate d–f and the end of the 21st century g–i. j–l Seasonal cycle of thermal-nonthermal regimes from the metrics MT-nonT (Eq. 4, Methods). MT-nonT > 0 atm mon-1 denotes periods where the thermal component is leading monthly pCO2 changes, while MT-nonT < 0 atm mon-1, denotes dominance of nonthermal processes (biological and mixing). The shading in all figures shows the inter-modal variability, computed as the standard deviation. Individual models are shown in Supplementary Fig. 10.
