reccap2_seasonality_main_plus_supp_apr06_2023

Abstract

The seasonal cycle is the dominant mode of variability in the air-sea CO 2 flux in most regions of the global ocean, yet discrepancies between different seasonality estimates are rather large.As part of the Regional Carbon Cycle Assessment and Processes phase 2 project (RECCAP2), we synthesize surface ocean pCO 2 and air-sea CO 2 flux seasonality from models and observation-based estimates, focusing on both a modern climatology and decadal changes between the 1980s and 2010s. Four main findings emerge: First, global ocean biogeochemistry models (GOBMs) and observation-based estimates (pCO 2 products) of surface pCO 2 seasonality disagree, primarily due to discrepancies in the seasonal variability in surface DIC. Second, the seasonal cycle in pCO 2 has increased in amplitude over the last three decades in both pCO 2 products and GOBMs. Third, decadal increases in pCO 2 seasonal cycle amplitudes in subtropical biomes for both pCO 2 products and GOBMs are driven by increasing DIC concentrations stemming from the uptake of anthropogenic CO 2 (C ant ). In subpolar and Southern Ocean biomes, however, the seasonality change for GOBMs is dominated by C ant invasion, whereas for pCO 2 products an indeterminate combination of C ant invasion and climate change modulates the changes. Fourth, we have shown that biomeaggregated decadal changes in the amplitude of pCO 2 seasonal variability are largely detectable against both mapping uncertainty (reducible) and natural variability uncertainty (irreducible), but not at the gridpoint scale over much of the northern subpolar oceans and over the Southern Ocean, underscoring the importance of sustained high-quality seasonallyresolved measurements over these regions.