Decadal-scale reduction in net primary production in the western subarctic North Pacific : impact of lateral transport of dissolved iron from the Sea of Okhotsk

Nakanowatari, Takuya; Nakamura, Tomohiro; Mitsudera, Humio; Nishioka, Jun; Nishikawa, Hatsumi; Kuroda, Hiroshi; Uchimoto, Keisuke

Decadal-scale reduction in net primary production in the western subarctic North Pacific : impact of lateral transport of dissolved iron from the Sea of Okhotsk

Nakanowatari, Takuya; Nakamura, Tomohiro; Mitsudera, Humio et al.

Environmental Research Letters, 2025, 20(5), 054027

Permalink : https://hdl.handle.net/2115/95303

このアイテムのアクセス数:167件（2026-07-28 23:05 集計）

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https://doi.org/10.1088/1748-9326/adc614			94

論文情報

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アクセス権	open access
URI	https://hdl.handle.net/2115/95303
タイトル	Decadal-scale reduction in net primary production in the western subarctic North Pacific : impact of lateral transport of dissolved iron from the Sea of Okhotsk
著者	Nakanowatari, Takuya ; Nakamura, Tomohiro ; Mitsudera, Humio ; Nishioka, Jun ; Nishikawa, Hatsumi ; Kuroda, Hiroshi ; Uchimoto, Keisuke
e-Rad_Researcher 20400012 著者名 Nakanowatari, Takuya
e-Rad_Researcher 60400008 著者名 Nakamura, Tomohiro
e-Rad_Researcher 20360943 著者名 Mitsudera, Humio
e-Rad_Researcher 90371533 著者名 Nishioka, Jun
e-Rad_Researcher 10783392 著者名 Nishikawa, Hatsumi
e-Rad_Researcher 30531107 著者名 Kuroda, Hiroshi
e-Rad_Researcher 10374646 著者名 Uchimoto, Keisuke
言語	英語
発行日	2025
出版者	IOP
収録物名	Environmental Research Letters
巻(号)	20(5)
ページ	054027
抄録	The subarctic North Pacific (SNP) is a high-nutrient low-chlorophyll region in which decoupling of dissolved iron (dFe) and macronutrient is an essential control of primary production. In this study, we evaluate the influence of decadal-scale climate change on the net primary production (NPP) in the SNP by performing a hindcast experiment for 1979–2016 using an ice–ocean coupled model with a simple biogeochemical model with iron cycle. Simulation results show a significant NPP decrease in the subtropical–subarctic gyre boundary (SGB) region since the 1990s; the trend is −48 mgC m−2 d−1/37 years with a magnitude that is 14.3% of the climatological mean NPP. The NPP decrease in the SGB is prominent during the spring, indicating weakening of the spring bloom. Diagnostic analysis of simulation data reveals that the NPP decrease in the SGB can be explained by the decrease in both dFe and light availability. Sensitivity experiments indicate that wind-driven circulation change mainly explains both the reduction in dFe and the light availability through the northward expansion of oligotrophic subtropical water, but the thermohaline change in the Sea of Okhotsk also has a non-negligible effect on the dFe reduction. Results from our numerical model simulations suggest the importance of lateral and vertical advection of dFe on the decadal-scale changes of NPP in the SNP.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
EISSN	1748-9326
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1088/1748-9326/adc614