Ocean biogeochemistry plays a crucial role in sustaining the marine ecosystem and global carbon cycle. To investigate the oceanic biogeochemical responses to iron parameters in the tropical Pacific, we conducted sensitivity experiments using the Nucleus for European Modelling of the Ocean–Tracers of Ocean Phytoplankton with Allometric Zooplankton (NEMO-TOPAZ) model. Compared to observations, the NEMO-TOPAZ model overestimated the concentrations of chlorophyll and dissolved iron (DFe). The sensitivity tests showed that with increasing (+50%) iron scavenging rates, chlorophyll concentrations in the tropical Pacific were reduced by approximately 16%. The bias in DFe also decreased by approximately 7%; however, the sea surface temperature was not affected. As such, these results can facilitate the development of the model tuning strategy to improve ocean biogeochemical performance using the NEMOTOPAZ model.

Abstract
Introduction
Methodology
    Dissolved Iron Parameters
    Sensitivity Tests of Iron Parameters
    Model Setup and Data
Results
Summary and Discussion
References

• Hyomee Lee(Division of Science Education & Institute of Fusion Science, Jeonbuk National University)
• Byung-Kwon Moon(Division of Science Education & Institute of Fusion Science, Jeonbuk National University) Corresponding author
• Jong-Yeon Park(Division of Earth and Environmental Science, Jeonbuk National University)
• Han-Kyoung Kim(Division of Science Education & Institute of Fusion Science, Jeonbuk National University)
• Hyun-Chae Jung(Mirae Climate Co., Ltd.)
• Jieun Wie(Division of Science Education & Institute of Fusion Science, Jeonbuk National University)
• Hyo Jin Park(Jeonju Jungang Middle School)
• Young-Hwa Byun(Innovative Meteorological Research Department, National Institute of Meteorological Sciences)
• Yoon-Jin Lim(Numerical Modeling Center, Korea Meteorological Administration)
• Johan Lee(Operational Systems Development Department, National Institute of Meteorological Sciences)