Implementing riverine biogeochemical inputs in ECCO-Darwin: a sensitivity analysis of terrestrial fluxes in a data-assimilative global ocean biogeochemistry model
Name
gmd-19-867-2026.pdf
Description
Published version
Size
7.43 MB
Format
Adobe PDF
Checksum (MD5)
b0943e40b4ca6fa20a7e7c981cef0a04
Author(s)
Savelli, Raphaël
Carroll, Dustin
Menemenlis, Dimitris
Lauderdale, Jonathan M
Bertin, Clément
Dutkiewicz, Stephanie
Manizza, Manfredi
Bloom, A Anthony
Castro-Morales, Karel
Miller, Charles E
Date Issued
January 26, 2026
Journal
Geoscientific Model Development
Publisher
Copernicus GmbH
Citation
Savelli, R., Carroll, D., Menemenlis, D., Lauderdale, J. M., Bertin, C., Dutkiewicz, S., Manizza, M., Bloom, A. A., Castro-Morales, K., Miller, C. E., Simard, M., Bowman, K. W., and Zhang, H.: Implementing riverine biogeochemical inputs in ECCO-Darwin: a sensitivity analysis of terrestrial fluxes in a data-assimilative global ocean biogeochemistry model, Geosci. Model Dev., 19, 867–885.
Version
Final published version
Abstract
Terrestrial sources of carbon and nutrients drive biogeochemical cycles in coastal regions and in the global ocean. Quantifying their impact on the spatiotemporal variability of the ocean carbon cycle is pivotal to understanding the distinctive characteristics of ocean basins dominated by riverine inflow. ECCO-Darwin is a data-constrained, global-ocean biogeochemistry model that has heretofore lacked lateral inputs of carbon and nutrients. The objective of this study is to add this new capability to ECCO-Darwin and to carry out a suite of sensitivity experiments in order to quantify the impact of these lateral fluxes on coastal- and open-ocean biogeochemistry. In this work, we use an optimized version of the data-assimilative global-ocean biogeochemistry ECCO-Darwin model to perform a sensitivity analysis of the ocean to lateral inputs of carbon and nutrients. We generate riverine inputs by combining daily point-source freshwater discharge from JRA55-do with the Global NEWS 2 watershed model, accounting for lateral inputs from 5171 watersheds worldwide. The addition of riverine inputs drives a small CO2 outgassing (+0.02 Pg C yr−1) due to compensating processes at regional scales. In basins dominated by carbon runoff, such as the Tropical Atlantic and Arctic Oceans, the addition of riverine inputs increases CO2 outgassing (+13 % and +9 %, respectively). In contrast, runoff in nutrient-dominated Southeast Asia leads to increased CO2 uptake (+9 %). This new riverine biogeochemical input capability will enable future ECCO-Darwin solutions to better capture key processes that occur along coastal margins in global oceans.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Massachusetts Institute of Technology. Center for Global Change Science
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DOI of Published Version
https://doi.org/10.5194/gmd-19-867-2026
