Properties of winter mixed layer variability on the shelf-slope region facing the Kuroshio—study of Tosa Bay, southern Japan

Kuroda, Hiroshi; Hirota, Yuichi; Setou, Takashi; Aoki, Kazuhiro; Takahashi, Daisuke; Watanabe, Tomowo

doi:10.1007/s10236-013-0670-9

Cited by 7 publications

(4 citation statements)

References 39 publications

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“…12. The contour interval is 2 K example, the model might fail to represent sufficiently surface intrusion of the warm Kuroshio water (Kuroda et al 2014). This problem will be discussed again in Section 5.…”

Section: Tidal Mixing Parameterizationmentioning

confidence: 96%

“…Model studies are especially active near the Seto Inland Sea, and models with a horizontal resolution of 1-2 km have been presented as follows (see Fig. 2 for place names): Chang et al (2009) used a POM model with a horizontal resolution of 1 km to show seasonal variations of surface circulations within the Seto Inland Sea; Isobe et al (2010) and Isobe et al (2012) used a FVCOM model with a horizontal resolution of 1 km to forecast the Kuroshio water intrusion in the Bungo Channel; Miyazawa et al (2012) used a POM model with a horizontal resolution of 2 km (1/36 • ) to reproduce the frontal structure in the Kii Channel; and Kuroda et al (2013Kuroda et al ( , 2014) used a ROMS model with a horizontal resolution of 2 km to reveal circulations and formation processes of the winter mixed layer in the Tosa Bay.…”

Section: Introductionmentioning

confidence: 99%

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Development of an operational coastal model of the Seto Inland Sea, Japan

Sakamoto¹,

Yamanaka²,

Tsujino³

et al. 2015

Ocean Dynamics

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We have developed a coastal model of the Seto Inland Sea, Japan, for a monitoring and forecasting system operated by the Japan Meteorological Agency (JMA). We executed a hindcast experiment using reanalysis datasets for the atmospheric and lateral boundaries without ocean initialization by data assimilation. The seasonal variability is verified to be realistic by comparing sea surface temperature and salinity of the hindcast experiment with observations. With a horizontal resolution of approximately 2 km, the model represents explicitly various coastal phenomena with a scale of 10-100 km, such as the Kuroshio water intrusion into Japanese coasts. This leads to good representation of intramonthly variations. For example, intensity of the sea level undulations with a period shorter than 23 days shows 1.6-fold improvement, as compared to the present model of JMA with the horizontal resolution of approximately 10 km. In addition to the increased resolution, the model is optimized for coastal modeling as follows. Incorporation of a tidal mixing parameterization reduces a high temperature bias in the Bungo Channel (a western channel of the Seto Inland Sea) and contributes to formation of a frontal structure. An accurate dataset of the river discharges is used for runoff, which has a strong impact on salinity. Enhancement of coastal friction improves surface currents. Owing to the increased resolution and these optimizations, the model shows realistic variability in a wide temporal range from several days to seasons. Root-mean-square errors of sea surface temperature and heights are evaluated as 1-2 K and 7-10 cm, respectively, without data assimilation. In the eastern part, however, the predictability is relatively low, which might be related to representation of an eastward mean flow in the Seto Inland Sea.

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Section: Tidal Mixing Parameterizationmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Development of an operational coastal model of the Seto Inland Sea, Japan

Sakamoto¹,

Yamanaka²,

Tsujino³

et al. 2015

Ocean Dynamics

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“…The water temperature at the surface of Tosa Bay shows conspicuous seasonal changes and becomes highest in August and September (Sakamoto 1981, Kuroda et al 2014. Meanwhile, the water temperatures at depths of 50 m and 100 m in summer frequently are lower and do not show a clear seasonal pattern (Hirota et al 2002, Hirota & Ichikawa 2012.…”

Section: Introductionmentioning

confidence: 99%

Comparison of copepod communities during upwelling and non-upwelling in the summers from 1992 to 2010 in Tosa Bay, western Japan

Hirota¹,

Itoh²,

Morimoto

et al. 2017

Plankton Benthos Res

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Copepods were collected using a Norpac net (0.315 mm mesh aperture, 0.45 m mouth diameter) in the summers from 1992 to 2010 at Stn A (700 m depth) in Tosa Bay, western Japan. Among the summer samples collected in July and August, there were 19 net samples during periods of upwelling and 27 net samples during periods of nonupwelling, judged by criteria of water temperature. Total abundance of adult copepods in the upwelling samples was not significantly different from the abundance in the non-upwelling samples, while the number of species and species diversity in the upwelling samples was lower than in the non-upwelling samples. Adults of four species (Calanus sinicus, Clausocalanus parapergens, Paracalanus parvus s.l. and Corycaeus affinis) in the upwelling samples were significantly more abundant than those in the non-upwelling samples. The changes of the copepod community structure during periods of upwelling may be produced because of increases of species preferring low water temperatures and decreases of species preferring warm water temperatures.

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“…In addition, the islands are characterized by a narrow continental shelf (typically less than 50 km wide), with the result that mesoscale variations intermittently affect coastal waters through interactions with submesoscale variations [29] [30]. Moreover, mesoscale variability in the Kuroshio-Oyashio region is a key issue for Japanese fisheries and fisheries science, because many pelagic fish, which are important targets of Japanese fisheries, extensively use the Kuroshio-Oyashio region as spawning and nursery grounds.…”

Section: Introductionmentioning

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

Self Cite

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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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Properties of winter mixed layer variability on the shelf-slope region facing the Kuroshio—study of Tosa Bay, southern Japan

Cited by 7 publications

References 39 publications

Development of an operational coastal model of the Seto Inland Sea, Japan

Development of an operational coastal model of the Seto Inland Sea, Japan

Comparison of copepod communities during upwelling and non-upwelling in the summers from 1992 to 2010 in Tosa Bay, western 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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