The Oyashio Nutrient Stream and Its Nutrient Transport to the Mixed Water Region

Yu, Lushan; Zhu, Xiao‐Hua; Guo, Xinyu

doi:10.1029/2018gl081497

Cited by 14 publications

(9 citation statements)

References 37 publications

(87 reference statements)

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“…The value, however, might be underestimated or there is another missing upward flux of N (or exported N might be overestimated) because the uplifted N flux must be A B C greater than the exported N for maintaining high nutrient surface water in the subarctic Pacific. Together with previously reported information (37), approximately <1% of N in the SINP is annually transported to NPIW. Additionally, considering the nutrient data with dFe dataset analysis, the chemical properties of uplifted intermediate waters around the Aleutian ICs have a lower dFe:N ratio than the diatom demand (see next section).…”

Section: Formation Of Subarctic Intermediate Water Nutrient Poolsupporting

confidence: 73%

Subpolar marginal seas fuel the North Pacific through the intermediate water at the termination of the global ocean circulation

Nishioka

Obata

Ogawa

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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The mechanism by which nutrients in the deep ocean are uplifted to maintain nutrient-rich surface waters in the subarctic Pacific has not been properly described. The iron (Fe) supply processes that control biological production in the nutrient-rich waters are also still under debate. Here, we report the processes that determine the chemical properties of intermediate water and the uplift of Fe and nutrients to the main thermocline, which eventually maintains surface biological productivity. Extremely nutrient-rich water is pooled in intermediate water (26.8 to 27.6 σθ) in the western subarctic area, especially in the Bering Sea basin. Increases of two to four orders in the upward turbulent fluxes of nutrients were observed around the marginal sea island chains, indicating that nutrients are uplifted to the surface and are returned to the subarctic intermediate nutrient pool as sinking particles through the biological production and microbial degradation of organic substances. This nutrient circulation coupled with the dissolved Fe in upper-intermediate water (26.6 to 27.0 σθ) derived from the Okhotsk Sea evidently constructs an area that has one of the largest biological CO2drawdowns in the world ocean. These results highlight the pivotal roles of the marginal seas and the formation of intermediate water at the end of the ocean conveyor belt.

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Section: Formation Of Subarctic Intermediate Water Nutrient Poolsupporting

confidence: 73%

Subpolar marginal seas fuel the North Pacific through the intermediate water at the termination of the global ocean circulation

Nishioka

Obata

Ogawa

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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“…The absolute geostrophic velocities derived from the WOA18 represent the monthly climatological background flow. To test the applicability of this method, absolute geostrophic velocity data based on hydrographic data at the 147°E line is used for comparison (Long et al, 2018;Long et al, 2019).…”

Section: Other Datasetsmentioning

confidence: 99%

Volume Transport Estimation of the Kuroshio Extension based on Subsurface Mooring Array and Satellite Altimetry

Guo

Chen

Yang

et al. 2022

Preprint

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The vertical structure of the Kuroshio Extension (KE) is investigated using velocity measurements from a subsurface mooring array. Mode decomposition based on climatological Temperature/Salinity (T/S) data shows that the barotropic and first baroclinic normal modes dominate the vertical structure of the zonal flow in the KE. This structure is also well described by the leading mode of Empirical Orthogonal Functions (EOFs) that contains the first two vertical normal modes. Further analysis demonstrates that the projection coefficient of the mooring velocity onto the summed vertical mode could be well represented by the surface geostrophic velocity. Therefore, we propose a dynamic method that relates the surface geostrophic flow and the vertical structure of the zonal flow. The applicability of this method is verified with both reanalysis datasets and estimation from hydrographic data. The findings implicate that the KE transport can be well reproduced by surface geostrophic flow and climatological T/S data only.

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“…The most likely candidate process for compensating for these amounts is that they are fueled from nutrient-rich deep water in the marginal seas. Long et al (2019) estimated the amount of nitrate that was lost from the SINP by advection of the NPIW as 3.5 × 10 12 mol/year, and the amount of nitrate supplied from the deep layer to the intermediate layer should be complementary to this loss (Nishioka et al 2020). It also remains unclear how the silicate cycle, which is decoupled from the NO 3 the PO 4 cycles, maintains high concentrations in the meridional overturning cell subsystem of the NPIW.…”

Section: Subarctic Intermediate Nutrient Poolmentioning

confidence: 99%

A review: iron and nutrient supply in the subarctic Pacific and its impact on phytoplankton production

et al. 2021

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One of the most important breakthroughs in oceanography in the last 30 years was the discovery that iron (Fe) controls biological production as a micronutrient, and our understanding of Fe and nutrient biogeochemical dynamics in the ocean has significantly advanced. In this review, we looked back both previous and updated knowledge of the natural Fe supply processes and nutrient dynamics in the subarctic Pacific and its impact on biological production. Although atmospheric dust has been considered to be the most important source of Fe affecting biological production in the subarctic Pacific, other oceanic sources of Fe have been discovered. We propose a coherent explanation for the biological response in subarctic Pacific high nutrient low chlorophyll (HNLC) waters that incorporates knowledge of both the atmospheric Fe supplies and the oceanic Fe supplies. Finally, we extract future directions for Fe oceanographic research in the subarctic Pacific and summarize the uncertain issues identified thus far.

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The Oyashio Nutrient Stream and Its Nutrient Transport to the Mixed Water Region

Cited by 14 publications

References 37 publications

Subpolar marginal seas fuel the North Pacific through the intermediate water at the termination of the global ocean circulation

Subpolar marginal seas fuel the North Pacific through the intermediate water at the termination of the global ocean circulation

Volume Transport Estimation of the Kuroshio Extension based on Subsurface Mooring Array and Satellite Altimetry

A review: iron and nutrient supply in the subarctic Pacific and its impact on phytoplankton production

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