Observations of the structure of turbulent mixing across the Kuroshio

2012 ◽  
Vol 39 (15) ◽  
Author(s):  
Hitoshi Kaneko ◽  
Ichiro Yasuda ◽  
Kosei Komatsu ◽  
Sachihiko Itoh
Keyword(s):  
Turbulent Mixing ◽  
The Kuroshio

Spatial Structure of Turbulent Mixing in the Northwestern Pacific Ocean

2014 ◽  
Vol 44 (8) ◽  
pp. 2235-2247 ◽  
Author(s):  
Qingxuan Yang ◽  
Wei Zhao ◽  
Min Li ◽  
Jiwei Tian
Keyword(s):  
Pacific Ocean ◽  
Turbulent Mixing ◽  
Boundary Region ◽  
Horizontal Distribution ◽  
Northwestern Pacific ◽  
Western Boundary ◽  
Northwestern Pacific Ocean ◽  
Thorpe Scale ◽  
High Level ◽  
The Kuroshio

Abstract Turbulent mixing in the northwestern Pacific Ocean is estimated using the Gregg–Henyey–Polzin scaling and Thorpe-scale methods. The data sources are the hydrographic observations during October and November 2005. The results reveal clear spatial patterns of turbulent mixing in the study area. High-level diffusivity on the order of 10−3 m2 s−1 or larger is found within the western boundary region, where the Kuroshio flows northward. The width covered by this prominent diffusivity shows an increase from 12° to 18°N. The horizontal distribution of depth-averaged diffusivity in the top 500 m shows enhanced mixing with diffusivity of 6 × 10−3 m2 s−1 south of 9°N where the Mindanao Eddy remains a quasi-permanent feature. These two distinct patterns of diffusivity distribution suggest that the Kuroshio and the Mindanao Eddy are likely responsible for the elevated turbulent mixing in the study area.

scholarly journals Phytoplankton productivity and rapid trophic transfer to microzooplankton stimulated by turbulent nitrate flux in oligotrophic Kuroshio Current

2019 ◽  
Author(s):  
Toru Kobari ◽  
Taiga Honma ◽  
Daisuke Hasegawa ◽  
Naoki Yoshie ◽  
Eisuke Tsutumi ◽  
...  
Keyword(s):  
Turbulent Mixing ◽  
Euphotic Zone ◽  
Kuroshio Current ◽  
Biological Productivity ◽  
Phytoplankton Productivity ◽  
Kuroshio Front ◽  
Dilution Experiments ◽  
Nitrate Flux ◽  
Enrichment Experiments ◽  
The Kuroshio

Abstract. The Kuroshio Current has been thought to be biologically unproductive due to oligotrophic conditions and low plankton standing stocks. Nevertheless, major foraging fishes are known to grow and recruit around the Kuroshio Current. While mixing and advection supplying nutrients to the euphotic zone are happened by eddies and meanders but limited at the Kuroshio front, there is a risk that survival of vulnerable life stages is encountered under the low food availability. Here we report that phytoplankton productivity is stimulated by turbulent nitrate flux amplified with the Kuroshio Current and rapidly transferred to microzooplankton through their grazing. Oceanographic observations demonstrate that the Kuroshio Current topographically enhances significant turbulent mixing and nitrate influx to the euphotic zone. Gradual nutrient enrichment experiments show growth rates of phytoplankton and microzooplankton communities stimulated within a range of the turbulent nitrate flux. Dilution experiments imply a significant microzooplankton grazing on phytoplankton. We propose that these rapid and systematic trophodynamics enhance invisible biological productivity in the Kuroshio.

scholarly journals Turbulent mixing within the Kuroshio in the Tokara Strait

2017 ◽  
Vol 122 (9) ◽  
pp. 7082-7094 ◽  
Author(s):  
Eisuke Tsutsumi ◽  
Takeshi Matsuno ◽  
Ren-Chieh Lien ◽  
Hirohiko Nakamura ◽  
Tomoharu Senjyu ◽  
...  
Keyword(s):  
Turbulent Mixing ◽  
Tokara Strait ◽  
The Kuroshio

scholarly journals Phytoplankton growth and consumption by microzooplankton stimulated by turbulent nitrate flux suggest rapid trophic transfer in the oligotrophic Kuroshio

2020 ◽  
Vol 17 (9) ◽  
pp. 2441-2452 ◽  
Author(s):  
Toru Kobari ◽  
Taiga Honma ◽  
Daisuke Hasegawa ◽  
Naoki Yoshie ◽  
Eisuke Tsutsumi ◽  
...  
Keyword(s):  
Turbulent Mixing ◽  
Euphotic Zone ◽  
Kuroshio Current ◽  
Phytoplankton Growth ◽  
Life Stages ◽  
Biological Productivity ◽  
Dilution Experiments ◽  
Nitrate Flux ◽  
Enrichment Experiments ◽  
The Kuroshio

Abstract. The Kuroshio Current has been thought to be biologically unproductive because of its oligotrophic conditions and low plankton standing stocks. Even though vulnerable life stages of major foraging fishes risk being entrapped by frontal eddies and meanders and encountering low food availability, they have life cycle strategies that include growing and recruiting around the Kuroshio Current. Here we report that phytoplankton growth and consumption by microzooplankton are stimulated by turbulent nitrate flux amplified by the Kuroshio Current. Oceanographic observations demonstrate that the Kuroshio Current topographically enhances significant turbulent mixing and nitrate influx to the euphotic zone. Graduated nutrient enrichment experiments show that growth rates of phytoplankton and microheterotroph communities were stimulated within the range of the turbulent nitrate flux. Results of dilution experiments imply significant microzooplankton grazing on phytoplankton. We propose that these rapid and systematic trophodynamics enhance biological productivity in the Kuroshio.

Turbulent mixing in uniform channels of irregular cross-section

1994 ◽  
Vol 32 (1) ◽  
pp. 67-86 ◽  
Author(s):  
R. I. Nokes ◽  
G. O. Hughes
Keyword(s):  
Cross Section ◽  
Turbulent Mixing
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