Remote Sensing of the Kuroshio Current System

2018 ◽  
pp. 205-220
Author(s):  
Kaoru Ichikawa
Keyword(s):  
Remote Sensing ◽  
Current System ◽  
Kuroshio Current ◽  
The Kuroshio

scholarly journals Validation of the Kuroshio Current System in the dual-domain Pacific Ocean Model framework

2012 ◽  
Vol 105 ◽  
pp. 102-124 ◽  
Author(s):  
Yu-Heng Tseng ◽  
Mao-Lin Shen ◽  
Sen Jan ◽  
David E. Dietrich ◽  
Chia-Ping Chiang
Keyword(s):  
Pacific Ocean ◽  
Current System ◽  
Kuroshio Current ◽  
Ocean Model ◽  
Model Framework ◽  
Dual Domain ◽  
The Kuroshio

Density‐dependent egg production in chub mackerel in the Kuroshio Current system

2020 ◽  
Vol 30 (1) ◽  
pp. 38-50
Author(s):  
Akinori Takasuka ◽  
Michio Yoneda ◽  
Yoshioki Oozeki
Keyword(s):  
Egg Production ◽  
Current System ◽  
Kuroshio Current ◽  
Chub Mackerel ◽  
Density Dependent ◽  
The Kuroshio

scholarly journals Phase Synchronisation in the Kuroshio Current System

2019 ◽  
Author(s):  
Ann Kristin Klose ◽  
René M. van Westen ◽  
Henk A. Dijkstra
Keyword(s):  
Wind Stress ◽  
North Pacific ◽  
Time Scale ◽  
Rossby Waves ◽  
Model Simulation ◽  
Current System ◽  
Global Climate Model ◽  
Kuroshio Current ◽  
Study Phase ◽  
The Kuroshio

Abstract. The Kuroshio Current System in the North Pacific displays path transitions on a decadal time scale. It is known that both internal variability involving barotropic and baroclinic instabilities and remote Rossby waves induced by North Pacific wind-stress anomalies are involved in these path transitions. However, the precise coupling of both processes and its consequences for the dominant decadal transition time scale are still under discussion. Here, we analyse the output of a multi-centennial long high-resolution global climate model simulation and study phase synchronisation between Pacific zonal wind-stress anomalies and Kuroshio Current System path variability. We apply the Hilbert transform technique to determine the phase and find epochs where such phase synchronisation appears. The physics of this synchronisation is shown to occur through the effect of the vertical motion of isopycnals, as induced by the propagating Rossby waves, on the instabilities of the Kuroshio Current System.

Occurrence and density of Pacific sauryCololabis sairalarvae and juveniles in relation to environmental factors during the winter spawning season in the Kuroshio Current system

2014 ◽  
Vol 23 (4) ◽  
pp. 304-321 ◽  
Author(s):  
Akinori Takasuka ◽  
Hiroshi Kuroda ◽  
Takeshi Okunishi ◽  
Yugo Shimizu ◽  
Yuichi Hirota ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Current System ◽  
Kuroshio Current ◽  
Spawning Season ◽  
The Kuroshio

New progress of the Kuroshio Current System research by using ADEOS-OCTS

2000 ◽  
Vol 25 (5) ◽  
pp. 967-968
Author(s):  
Yoshiaki Toba ◽  
Hiroshi Murakami
Keyword(s):  
Current System ◽  
Kuroshio Current ◽  
System Research ◽  
The Kuroshio

scholarly journals Remote Sensing and Argo Float Observations Reveal Physical Processes Initiating a Winter-Spring Phytoplankton Bloom South of the Kuroshio Current Near Shikoku

2020 ◽  
Vol 12 (24) ◽  
pp. 4065
Author(s):  
Tongyu Wang ◽  
Fajin Chen ◽  
Shuwen Zhang ◽  
Jiayi Pan ◽  
Adam Thomas Devlin ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Mixed Layer ◽  
Phytoplankton Bloom ◽  
Kuroshio Current ◽  
Ekman Pumping ◽  
Physical Processes ◽  
Chl A ◽  
Argo Float ◽  
Deep Mixing ◽  
The Kuroshio

BIO-Argo float (chlorophyll a (Chl-a), temperature, and salinity profiles) and remote sensing data (Chl-a, photosynthetic available radiation (PAR), and wind) located south of the Kuroshio current near Shikoku from September 2018 to May 2019 were used to study phytoplankton bloom and their mechanisms of development in open oceans. Results show that higher (lower) Chl-a concentrations are correlated with a deeper (shallower) mixed layer (RPearson = 0.77, Rcrit = 0.12 (alpha = 0.05, n = 263)) compared to the average of Chl-a and mixed layer depth (0.13 mg/m3 and 105 m). The average net accumulation rates (r) of phytoplankton were close to 0.08 d−1. An increasing r corresponds to a gradually increasing surface Chl-a (S (Chl-a): 0–20 m average Chl-a) and integrated Chl-a inventory (I (Chl-a): integrated Chl-a from surface to euphotic depth). These phenomena indicate that the mechanism of winter-spring phytoplankton blooms is consistent with the dilution-recoupling hypotheses (DRH). During the bloom formation, winter deep mixing and eddy-wind Ekman pumping are enhanced by a strong winter monsoon. The enhancement may disturb predator–prey interactions and dilute zooplankton in deep mixed layers. Moreover, winter deep mixing and eddy-wind Ekman pumping can cause the nutrients to be transported into the euphotic layer, which can promote the growth of phytoplankton and increase grazing. During the bloom extinction, the stratification strengthens and the intensity of light increases; this increases grazing and nutrient consumption, and decreases the phytoplankton bloom significantly (S (Chl-a) and I (Chl-a) increase by 0.3 mg/m3 and 27 mg/m2, respectively). The output from a biogeochemistry model shows that nutrients are consistent with the temporal distribution of S (Chl-a) and I (Chl-a). Our results suggest that physical processes (deep winter mixing and eddy-wind Ekman pumping) under the DHR framework are critical factors for winter-spring blooms in open oceans with an anticyclone eddy.

scholarly journals Intrinsic low-frequency variability and predictability of the Kuroshio Current and of its extension

2014 ◽  
Vol 5 (2) ◽  
pp. 79 ◽  
Author(s):  
Stefano Pierini ◽  
Henk A. Dijkstra ◽  
Mu Mu
Keyword(s):  
Particle Filtering ◽  
Current System ◽  
Kuroshio Extension ◽  
Low Frequency ◽  
Kuroshio Current ◽  
Western Boundary ◽  
Boundary Current ◽  
Model Studies ◽  
Low Frequency Variability ◽  
The Kuroshio

Investigations of the intrinsic low-frequency variability and predictability of the Kuroshio Current and of its extension jet (the Kuroshio Extension, KE) are reviewed. The Kuroshio and KE in the North Pacific constitute a western boundary current system of great relevance from climatological and ecological viewpoints. Both the Kuroshio south of Japan and the KE display remarkable changes of bimodal character on interannual time scales that are believed to be intrinsic, i.e., basically generated by nonlinear oceanic mechanisms rather than by direct atmospheric forcing. Model studies of the Kuroshio and KE with climatological forcing are thus reviewed. Moreover, as these changes are chaotic, their predictability requires peculiar mathematical approaches: theoretical results concerning this important issue are therefore reviewed as well. Model studies aimed at determining the optimal precursors and optimally growing initial errors for the Kuroshio are described. Techniques based on Lyapunov exponents (including their Lagrangian extension) and on data assimilation techniques (namely, sequential importance sampling using a particle-filtering approach) are reviewed for the KE. The key problem of how to identify the areas where targeted observations can improve the forecast is also addressed. The role of wind forcing in triggering the KE oscillations is finally considered.

scholarly journals Phase synchronisation in the Kuroshio Current System

Ocean Science ◽  
2020 ◽  
Vol 16 (2) ◽  
pp. 435-449
Author(s):  
Ann Kristin Klose ◽  
René M. van Westen ◽  
Henk A. Dijkstra
Keyword(s):  
Wind Stress ◽  
North Pacific ◽  
Rossby Waves ◽  
Climate Model ◽  
Model Simulation ◽  
Current System ◽  
Global Climate Model ◽  
Kuroshio Current ◽  
Study Phase ◽  
The Kuroshio

Abstract. The Kuroshio Current System in the North Pacific displays path transitions on a decadal timescale. It is known that both internal variability involving barotropic and baroclinic instabilities and remote Rossby waves induced by North Pacific wind stress anomalies are involved in these path transitions. However, the precise coupling of both processes and its consequences for the dominant decadal transition timescale are still under discussion. Here, we analyse the output of a multi-centennial high-resolution global climate model simulation and study phase synchronisation between Pacific zonal wind stress anomalies and Kuroshio Current System path variability. We apply the Hilbert transform technique to determine the phase and find epochs where such phase synchronisation appears. The physics of this synchronisation are shown to occur through the effect of the vertical motion of isopycnals, as induced by the propagating Rossby waves, on the instabilities of the Kuroshio Current System.

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