[A-CG34] Projection and detection of global environmental change

[ACG34-03] Advancing Ocean Biogeochemistry and Ecosystem Dynamics in GFDL’s Earth System Model with and Eye Toward CMIP7

★Invited Papers

*Charles A Stock¹, Jessica Luo¹, John Dunne¹, Paul Ginoux¹, George Hagstrom^1,2, Minjin Lee^1,2, Sergey Malyshev¹, Fabian Paulot¹, Elena Shevliakova¹, Niki Zadeh¹ (1.NOAA Geophysical Fluid Dynamics Laboratory, 2.Princeton University)

Keywords:Ocean, Biogeochemistry, Climate Change

Over the last two decades, the Geophysical Fluid Dynamics Laboratory has striven to develop a marine ecosystem model capable of addressing a broadening set of earth system challenges with increasingly mechanistic formulations that will retain their robustness in the novel environments expected under climate change. In the 5th Coupled Model Intercomparison Project (CMIP5), the Tracers of Phytoplankton with Allometric Zooplankton (TOPAZ) model emphasized representation of large-scale oceanic carbon and nutrient cycling central to the ocean’s capacity to absorb carbon dioxide from the atmosphere. In CMIP6, the Carbon, Ocean Biogeochemistry and Lower Trophics (COBALT) augmented the foundation that TOPAZ provided with a more comprehensive formulation of plankton foodweb dynamics. This was motivated by desires to improve the representation of foodweb-modulated biogeochemical processes, and to better capture the flow of energy between phytoplankton and fish for living marine resource applications. GFDL’s CMIP6 contributions also featured expanded linkages across earth system components, including exchanges of ammonia across the air-sea interface, and the delivery of dynamically modulated dust from land. Numerous ocean ecosystem model advances are currently being explored with an eye toward GFDL’s CMIP7 earth system model contribution. These range from potential improvements to the fundamental ways that phytoplankton interact with nutrient and light fields (e.g., photoacclimation and nutrient stoichiometry), nutrient cycling (e.g., anammox), incorporation of increasing phytoplankton and zooplankton biodiversity, and integration of vertical migration. We are also further strengthening integration across earth system components, including advancing the representation of the delivery of carbon and nutrients delivered across the land-sea interface, and the exchange of radiatively active constituents across the air-sea interface. As with previous advances, investments are guided by an overarching interest in understanding the drivers and impacts of global change. We will highlight recently published results from these efforts, and discuss pragmatic considerations that may shape integration into GFDL’s CMIP7 Earth System Model.