Leveraging nitrogen isotopes to constrain nitrogen budgets and internal cycling using a global ocean biogeochemistry model under present and future climates

Información del proyecto

NISO-MARBL

Identificador del acuerdo de subvención: 101280864

DOI

10.3030/101280864

Fecha de la firma de la CE 31 Marzo 2026

Fecha de inicio 1 Febrero 2027

Fecha de finalización 31 Enero 2029

Financiado con arreglo a

• Marie Skłodowska-Curie Actions (MSCA)

Coste total

Sin datos

Aportación de la UE

€ 232 916,16

Coordinado por

UNIVERSITEIT VAN AMSTERDAM
Netherlands

Objetivo

Nitrogen (N) is essential for all life on Earth, including phytoplankton living in the surface ocean. As such, the availability of N limits primary productivity across much of the global ocean, exerting a control on the biological carbon pump and climate. Yet, uncertainties in estimates of global N sinks and sources affect our understanding of ocean fertility. Since the N cycle is uniquely mediated by biological processes, an incomplete understanding of ecosystem dynamics limit our ability to quantify nutrient budgets and cycling. Studying N isotopes can fill this knowledge gap, as they provide novel information about ocean circulation, N cycling, and ecosystem change. By combining N isotopes and biogeochemical ocean modeling, this project aims to improve our quantitative understanding of the physical and biological processes controlling the N budget and N recycling in the present and future ocean. I will incorporate N isotopes into MARBL, the ocean biogeochemistry component of the Community Earth System Model. To place additional constraints on the N cycle, I will also add two novel tracers to the model, heterotrophic bacteria and the oxygen isotope ratios of nitrate. Using this framework, I will address the N budget including inter-basin balancing of N loss, and N recycling including the bacterial production of ammonium fueling phytoplankton. I will investigate these themes in the context of both the present day and future ocean to explore the sensitivity of the N cycle to warming and deoxygenation. The recent and rapid expansion of N isotope measurements and measurement facilities over the past five years provide an opportune window in which to develop and validate the state-of-the-art N isotope model. This work will provide coherent interpretations of existing modern and paleoceanographic data and will advance our understanding of the role that the ocean N cycle plays in driving fertility, carbon sequestration, and climate.

Ámbito científico (EuroSciVoc)

• ingeniería y tecnología › ingeniería ambiental › gestión de residuos › procesos de tratamiento de residuos › reciclaje
• ciencias naturales › ciencias de la tierra y ciencias ambientales conexas › geoquímica › biogeoquímica

Palabras clave

• Isotope geochemistry; numerical ocean modeling; marine nitrogen cycling

Programa(s)

• HORIZON.1.2 - Marie Skłodowska-Curie Actions (MSCA) PROGRAMA PRINCIPAL
  

Tema(s)

• HORIZON-MSCA-2025-PF-01-01 - MSCA Postdoctoral Fellowships 2025
  

Régimen de financiación

HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships

Convocatoria de propuestas

HORIZON-MSCA-2025-PF

Coordinador

UNIVERSITEIT VAN AMSTERDAM

• Aportación neta de la UEn: € 232 916,16
• Dirección: SPUI 21 ; 1012WX Amsterdam ; Países Bajos
• Tipo de actividad: Higher or Secondary Education Establishments
• Coste total: Sin datos