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Journal Articles

Influencec of atmospheric disturbances on the lower trophic level ecosystem in the Japan Sea

Onitsuka, Go*; Yanagi, Tetsuo*; Uno, Itsushi*; Kawamura, Hideyuki; Yoon, J.-H.*; Yamanaka, Yasuhiro*

Engan Kaiyo Kenkyu, 50(1), p.45 - 51, 2012/08

A seasonal variation of phytoplankton concentration is remarkable in the surface layer of the Japan Sea, because of a seasonal variation of solar radiation and nutrient. While, it is suggested that atmospheric perturbation such as typhoon effects a lower level ecosystem in the surface layer. An effect of atmospheric perturbation on the lower level ecosystem was estimated by means of an ocean general circulation model and a lower level ecosystem model in this study. Results of numerical experiments suggested that the atmospheric perturbation enhances a primary production in the Japan Sea.

Journal Articles

Assessment system of marine environment in the Japan Sea

Kawamura, Hideyuki; Kobayashi, Takuya; Togawa, Orihiko; Onitsuka, Go*

Proceedings of 7th International Conference on Natural Computation (ICNC '11)/8th International Conference on Fuzzy Systems and Knowledge Discovery (FSKD '11), p.1742 - 1746, 2011/07

An assessment system of marine environment in the Japan Sea is developed in Japan Atomic Energy Agency to calculate a movement of pollutants such as radionuclides and their effect on Japanese people. The assessment system consists of three models, ocean general circulation model, particle random-walk model, and dose assessment model. The assessment system was applied so far to a numerical experiment of an oil spill accident and a numerical experiment for reproduction of concentration of anthropogenic radionuclides in the Japan Sea. In addition, the lower trophic level ecosystem model is being developed to estimate a suspended solid in the Japan Sea.

Oral presentation

Development of a material circulation model in the Japan Sea

Kawamura, Hideyuki; Kobayashi, Takuya; Ito, Toshimichi; Otosaka, Shigeyoshi; Togawa, Orihiko; Onitsuka, Go*; Hirose, Naoki*

no journal, , 

Japan Atomic Energy Agency has been developing a material circulation model in the Japan Sea to confirm aspect of observational results. The material circulation model consists of three numerical models, an ocean general circulation model, a particle random-walk model and a lower trophic ecosystem model. A preliminary numerical experiment shows that vertical profile and total amount of Sr-90 and Cs-137 are well compared with observational results.

Oral presentation

Effect of synoptic scale meteorological peturbation on primary production in the Japan Sea

Onitsuka, Go*; Yanagi, Tetsuo*; Uno, Itsushi*; Kawamura, Hideyuki; Yoon, J.-H.*; Yamanaka, Yasuhiro*

no journal, , 

It is suggested that seasonal variation of phytoplankton concentration in the surface layer is remarkable in the Japan Sea and it is additionally reported that increase of phytoplankton concentration is found due to synoptic scale meteorological perturbation. In this study, effect of synoptic scale meteorological perturbation and deposition of nitrogen from atmosphere on primary production in the Japan Sea is estimated in numerical experiments. Short period oscillation of primary production due to synoptic scale meteorological perturbation is dominant between April and November in the numerical experiments. It is suggested that the primary production in the Japan Sea is supported by supply of nutrient due to synoptic scale meteorological perturbation by about 5% and that from atmosphere by about 2%, respectively.

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