Estimating the Kuroshio Axis South of Japan Using Combination of Satellite Altimetry and Drifting Buoys

Ambe, Daisuke; Imawaki, Shiro; Uchida, Hiroshi; Ichikawa, Kaoru

doi:10.1023/b:joce.0000038343.31468.fe

Cited by 75 publications

(48 citation statements)

References 8 publications

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“…By tracking the locally strongest part of the velocity field, the Kuroshio axis can be extracted [39]. It is well known that the Kuroshio path south of Japan can be categorized into two typical patterns: the Non Large Meander (NLM) path and the Large Meander (LM) path.…”

Section: Monitoring Of the Kuroshio Flowmentioning

confidence: 99%

Measuring the Global Ocean Surface Circulation with Satellite and In Situ Observations

Dohan¹

2010

Proceedings of OceanObs'09: Sustained Ocean Observations and Information for Society

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Section: Monitoring Of the Kuroshio Flowmentioning

confidence: 99%

Measuring the Global Ocean Surface Circulation with Satellite and In Situ Observations

Dohan¹

2010

Proceedings of OceanObs'09: Sustained Ocean Observations and Information for Society

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“…In contrast to its large meander path, the Kuroshio may persist in a non-large meander state, either paralleling the coast south of Japan all the way to Izu Ridge, hugging the narrow shelf and steep slope there (i.e., the "normal" non-large meander state), or paralleling the coast until the Kii Peninsula and then taking an offshore (~170 km shifted) path to cross over Izu Ridge south of Hachijo-jima (i.e., the "offshore" non-large meander state). The Kuroshio persisted in the nonlarge meander state from 1991 through June 2004 (Ambe et al, 2004;Kawabe, 2005) and then again from August 2005 to 2010 (Usui et al, 2013). A large meander state from September 2004 through January 2005 (Usui et al, 2011) was first observed in satellite altimetry records (which began in late 1992) and is thus far the only large meander reported in satellite altimetry data.…”

Section: The Kuroshio South Of Japanmentioning

confidence: 88%

“…Even when the large meander state is absent, there are frequent transitory meanders that occur in the Kuroshio between Tokara Strait and Izu Ridge (Solomon, 1978;Book et al 2002;Ambe et al, 2004;Kakinoki et al, 2008). One mechanism for the creation of these short-term eastward-propagating meanders is direct interactions between the Kuroshio and westward-propagating mesoscale eddies as investigated by Ebuchi and Hanawa (2003).…”

Section: The Kuroshio South Of Japanmentioning

confidence: 99%

“…The Kuroshio persisted in the non- The onset and decay of the large meander state have received much attention in the literature. However, since this 2004/2005 event is thus far the only large meander period observed in the satellite era, most studies have relied heavily on numerical models to identify this state (e.g., Endoh and Hibiya, 2001;Douglass et al, 2012;Usui et al, 2013).Even when the large meander state is absent, there are frequent transitory meanders that occur in the Kuroshio between Tokara Strait and Izu Ridge (Solomon, 1978;Book et al 2002;Ambe et al, 2004;Kakinoki et al, 2008). One mechanism for the creation of these short-term eastward-propagating meanders is direct interactions between the Kuroshio and westward-propagating mesoscale eddies as investigated by Ebuchi and Hanawa (2003).…”

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confidence: 99%

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Mean Structure and Variability of the Kuroshio from Northeastern Taiwan to Southwestern Japan

Andres¹,

Jan²,

Sanford³

et al. 2015

Oceanog

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Mean Structure and Variability of the Kuroshio from Northeastern Taiwan to Southwestern JapanABSTRACT. In the subtropical western North Pacific Ocean, the Kuroshio delivers heat, salt, and momentum poleward, much like its North Atlantic analog, the Gulf Stream. Though the Kuroshio generally flows along the western boundary from Taiwan to southeastern Japan as an "attached" current, the Kuroshio's strength, vertical structure, and horizontal position undergo significant temporal and spatial variability along this entire route. Ubiquitous mesoscale eddies and complicated topography associated with a string of marginal seas combine to make the western North Pacific a region with complex circulation. Here, we synthesize results from the recent US Origins of the Kuroshio and Mindanao Currents and Taiwan Observations of Kuroshio Transport Variability observational programs with previous findings to build a comprehensive picture of the Kuroshio on its route from northeastern Taiwan to southeastern Japan, where the current finally transitions from a western boundary current into the Kuroshio Extension, a vigorously meandering free jet. in the western North Pacific over the past decades, many of them supported by ONR, that have focused on different sections along the Kuroshio (Table 1). Here, we summarize some of these earlier field programs and synthesize them with OKMC/OKTV results to describe the downstream evolution of the Kuroshio along its route from the western Philippine Basin through the East China Sea to south of Japan (Figure 1a). MEASURING THE KUROSHIODue to the rich eddy field in the western North Pacific (Figure 2a), individual synoptic sections across the Kuroshio from shipboard measurements are often not representative of the current's mean state. Longer duration measurements (or many crossings) are needed to estimate the current's mean transport and velocity structure. Since 1991, arrays of inverted echo sounders (IESs) have been deployed at various sections across the Kuroshio (e.g., Table 1 and the green lines in Figure 3a) to measure variability at hourly resolution for durations of one year or more. In most cases, the IESs were also equipped with pressure sensors (PIESs) and additional current sensors (CPIESs) or horizontal electric field sensors (HPIESs) to help establish the Kuroshio's time-varying position, absolute geostrophic transport, and velocity structure (see Meinen et al., 2002;Donohue et al., 2010;and Szuts, 2012, for reviews of the methodologies and the title page photo [opposite] for an image of a PIES). One of these experiments was along the Affiliated Surveys of the Kuroshio off Cape Ashizuri (ASUKA) Line, which extends 1,000 km southeastward from Shikoku, Japan, into the Philippine Basin (Figure 3a). A full array of instruments was deployed there from 1993 to 1995 (Book et al., 2002) with a reduced two-IES array maintained through (Kakinoki et al., 2008. Two IES arrays were also deployed along the PN Line, a repeat hydrographic line in the East China Sea northwest of Okinawa (labele...

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“…These regions are characterized by strong tidal currents and mixing, which were not parameterized or simulated by FRA-ROMS. The positions of the axes of the Kuroshio and Kuroshio Extension were specified from the reanalysis data by combining the methods of [65] and [66]. Used alone, the former method could not successfully specify the axis position of the Kuroshio Extension, where mesoscale eddies interact intermittently with the mainstream axis.…”

Section: Analyses From An Eulerian Viewpointmentioning

confidence: 99%

Recent Advances in Japanese Fisheries Science in the Kuroshio-Oyashio Region through Development of the FRA-ROMS Ocean Forecast System: Overview of the Reproducibility of Reanalysis Products

Kuroda¹,

Setou²,

Kakehi³

et al. 2017

OJMS

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To address various fisheries science problems around Japan, the Japan Fisheries Research and Education Agency (FRA) has developed an ocean forecast system by combining an ocean circulation model based on the Regional Ocean Modeling System (ROMS) with three-dimensional variational analysis schemes. This system, which is called FRA-ROMS, is a basic and essential tool for the systematic conduct of fisheries science. The main aim of FRA-ROMS is to realistically simulate mesoscale variations over the Kuroshio-Oyashio region. Here, in situ oceanographic and satellite data were assimilated into FRA-ROMS using a weekly time window. We first examined the reproducibility through comparison with several oceanographic datasets with an Eulerian reference frame. FRA-ROMS was able to reproduce representative features of mesoscale variations such as the position of the Kuroshio path, variability of the Kuroshio Extension, and southward intrusions of the Oyashio. Second, using a Lagrangian reference frame, we estimated position errors between ocean drifters and How to cite this paper: Kuroda, H., Setou, T., Kakehi, S., Ito, S., Taneda, T., Azumaya, T., Inagake, D., Hiroe, Y., Morinaga, K., Okazaki, M., Yokota, T., Okunishi, T. 63particles passively transported by simulated currents, because particle tracking is an essential technique used in applications of reanalysis products to fisheries science. Finally, we summarize recent and ongoing fisheries studies that use FRA-ROMS and mention several new developments and enhancements that will be implemented in the near future.

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Estimating the Kuroshio Axis South of Japan Using Combination of Satellite Altimetry and Drifting Buoys

Cited by 75 publications

References 8 publications

Measuring the Global Ocean Surface Circulation with Satellite and In Situ Observations

Measuring the Global Ocean Surface Circulation with Satellite and In Situ Observations

Mean Structure and Variability of the Kuroshio from Northeastern Taiwan to Southwestern Japan

Recent Advances in Japanese Fisheries Science in the Kuroshio-Oyashio Region through Development of the FRA-ROMS Ocean Forecast System: Overview of the Reproducibility of Reanalysis Products

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