Preprints
https://doi.org/10.5194/egusphere-2024-1509
https://doi.org/10.5194/egusphere-2024-1509
22 Oct 2024
 | 22 Oct 2024
Status: this preprint is open for discussion.

Development and assessment of the physical-biogeochemical ocean regional model in the Northwest Pacific: NPRT v1.0 (ROMS v3.9–TOPAZ v2.0)

Daehyuk Kim, Hyun-Chae Jung, Jae-Hong Moon, and Na-Hyeon Lee

Abstract. The biogeochemical cycling system exhibits diverse characteristics in different regions owing to various factors. The Northwest Pacific is characterized by the presence of the warm and nutrient-depleted Kuroshio Current and the cold and nutrient-enriched Oyashio Current. In this region, surface primary production leads to increased nutrient consumption and CO2 exchange. The Yellow and East China Seas (YECS) are predominantly influenced by freshwater input. A high resolution regional numerical model tailored to the specific features of each area is required to reproduce the different characteristics of each region. Therefore, to accurately analyze the physical and biogeochemical system, this study developed a new coupled physical-biogeochemical model combining the three-dimensional Regional Ocean Modeling System (ROMS) and the Generic Ocean Turbulence Model Tracers of Phytoplankton with Allometric Zooplankton (TOPAZ) for the Northwest Pacific, including the YECS. The simulated physical and biogeochemical variables in the ROMS–TOPAZ (NPRT) were evaluated by comparing them with available observational data. The spatial correlation ranges of the various variables reproduced in the NPRT were 0.5–0.7. In the upper layer (0–20 m), NPRT successfully simulated the seasonal variability of chlorophyll, capturing two peaks in spring and summer, which were not captured by the CMIP6 data. Particularly in the YECS, NPRT effectively represented the biomass driven by riverine effect, which is difficult to reproduce in global biogeochemical model with low-resolution. However, NPRT still exhibits significant biases in the subarctic region and marginal seas. To minimize the uncertainties in biogeochemical variables, it is necessary to refine the initial and boundary conditions, adjust parameters, and apply discharge forcing based on observational data. Despite these limitations, NPRT is an important tool for studying the interaction between ocean physics and biogeochemistry at a high resolution.

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Daehyuk Kim, Hyun-Chae Jung, Jae-Hong Moon, and Na-Hyeon Lee

Status: open (until 17 Dec 2024)

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  • RC1: 'Comment on egusphere-2024-1509', Anonymous Referee #1, 28 Oct 2024 reply
Daehyuk Kim, Hyun-Chae Jung, Jae-Hong Moon, and Na-Hyeon Lee

Data sets

ROMS-TOPAZ (NPRT V1.0) input and output data Daehyuk Kim and Hyun-Chae Jung https://zenodo.org/records/13941078

Model code and software

physical-biogeochemical ocean regional ocean model: ROMS –TOPAZ (NPRT V1.0) Daehyuk Kim, Hyun-Chae Jung, and Jae-Hong Moon, https://doi.org/10.5281/zenodo.11218350

Daehyuk Kim, Hyun-Chae Jung, Jae-Hong Moon, and Na-Hyeon Lee

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Short summary
Physical–biogeochemical ocean global models is difficult to analyze oceanic environmental systems. To accurately understand the physical–biogeochemical processes at the regional scale, physical and biogeochemical models were coupled at a high resolution. The results successfully simulated the seasonal variations of chlorophyll and nutrients, particularly in the marginal seas, which were not captured by global models. The model is an important tool for studying physical–biogeochemical processes.