Biogeochemical Responses to Seasonal Oceanic Variability Around the Kuroshio Analyzed Using a Roms-NPZD Model

Suzue, Yota; Uchiyama, Yusuke; Yamazaki, Hidekatsu

doi:10.2208/kaigan.73.i_457

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…Abundant heat and larvae/juvenile of fish are transported to the Shikoku sea area by the Kuroshio Current [ 1 ]. Additionally, due to the turbulence of the Kuroshio Current, the abundance of nutrients contained in the deep sea are rolled up to the shallow layer, resulting in sustained primary production in the Shikoku sea area [ 2 ]. Thus, the Shikoku sea area is rich in plankton and is a suitable spawning ground and habitat for fish, making it a good fishing ground for the food chain [ 3 ].…”

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confidence: 99%

Seasonal variation in fish school spatial distribution and abundance under the Kuroshio regular pattern and the large meander in Suzu coastal waters

et al. 2021

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The Kuroshio Current can take two paths; usually it follows the regular pattern but occasionally it follows a pattern known as the large meander. In this study, we investigated the abundance of fish that migrate to coastal waters and the spatial distribution of fish schools under both Kuroshio patterns in Suzu district, Kochi prefecture, where the set net is the main fishery industry. We clarified the seasonal variation in the density and distribution of fish schools using a quantitative echo sounder. The effects of the Kuroshio large meander (LM) depended on the season. There was no effect of current pattern in summer or autumn, but in winter and spring the LM altered the marine environment and fish distributions. Cold water masses were formed in the survey area during winter and spring during the LM, and the water temperature dropped significantly compared with during the Kuroshio non-large meander (NLM). This altered the fish species and the distribution of fish schools in the survey area. The catches of Japanese horse mackerels (Trachurus japonicus) and Yellowtails (Seriola quinqueradiata) were much higher during the LM compared with those during the NLM. Unlike these two species, the small-sized pelagic fishes in spring has decreased significantly during the LM.

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Section: Introductionmentioning

confidence: 99%

Seasonal variation in fish school spatial distribution and abundance under the Kuroshio regular pattern and the large meander in Suzu coastal waters

et al. 2021

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Middle Miocene Paleoceanography of the Niigata oil field, northern Japan, based on calcareous nannofossils

Sato

Kato

Chiyonobu

2021

Jour. Geol. Soc. Japan

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We studied in detail the middle Miocene NN5 and NN6 calcareous nannofossil assemblages of the Nanatani Formation for reconstruction of the paleoceanography of the Niigata oil field.The wide area located in the Niigata plain from Mitsuke to Yahiko-Teradomari is interpreted as an area of non-marine paleoenvironments during the deposition of the NN5 to NN6 zones, which is consistent with the previous seismic stratigraphic interpretation.In addition, abundant NN5 calcareous nannofossils related to the main ocean current system are found in the area from the southeast to northeast along the Shibata-Koide tectonic line. The abundance decreased in the NN6 zone, which was paralleled with the shrinkage of the marine area within the Niigata basin. The timing of this environmental change between the NN5/NN6 is correlated to a cooling event shown by Holbourn et al. (2013) just after the Mid-Miocene Climatic Optimum, and hence the fall of the global sea level. This indicates that the environment changes in the late Nanatani Age were strongly influenced by the middle Miocene global climatic event.Furthermore, the NN5 and NN6 calcareous nannofossils are absent in the oil and gas fields, which are characterized by Miocene volcanic reservoirs. This evidences that the topographic relieves around the oil and gas fields today already existed prior to the time of the deposition of the NN5 zone. This suggests that the general framework of the oil and gas-bearing structures would have been established as a consequence of the rifting and rift-related volcanism during the opening of the Japan Sea.

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Biogeochemical Responses to Seasonal Oceanic Variability Around the Kuroshio Analyzed Using a Roms-NPZD Model

Cited by 2 publications

References 6 publications

Seasonal variation in fish school spatial distribution and abundance under the Kuroshio regular pattern and the large meander in Suzu coastal waters

Seasonal variation in fish school spatial distribution and abundance under the Kuroshio regular pattern and the large meander in Suzu coastal waters

Middle Miocene Paleoceanography of the Niigata oil field, northern Japan, based on calcareous nannofossils

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