Savelli, R., Carroll, D., Menemenlis, D., Bilir, T.E., Bloom, A.A., Dutkiewicz, S., Bowman, K., and Simard, M. (2025)
Presented at:
AGU Annual Meeting 2025The terrestrial-aquatic interface plays a pivotal role in transforming carbon exported to the ocean. The accounting of sinks and sources of carbon across the Land-to-Ocean Aquatic Continuum (LOAC) is often absent, or poorly-resolved when forcing global-ocean biogeochemistry models with land-surface model exports. In this study, we couple the ECCO-Darwin global ocean-biogeochemistry model with terrestrial carbon and freshwater fluxes from the data-constrained CARDAMOM framework, simulating the space-time variability of carbon runoff, routing, and discharge to the ocean. We run ECCO-Darwin experiments using riverine exports computed from CARDAMOM from 2001 to near-present to isolate the effects of refined quantity and quality of dissolved organic carbon lateral fluxes on marine carbon cycling and air–sea CO
exchange. To account for biogeochemical transformations across the salinity gradient, we include LOAC module at the land-ocean boundaries of ECCO-Darwin using the Carbon-Generic Estuary Model (C-GEM). This module enables the simulation of estuarine filtering processes that regulate the delivery of terrestrial carbon to the coastal ocean. The coupling of CARDAMOM and ECCO-Darwin, further refined with the LOAC module, provides new capabilities to investigate how climate change, land-use alteration, and atmospheric CO
growth rate influence the global land-ocean carbon continuum.
