Transfer of radiocaesium from contaminated bottom sediments to marine organisms through benthic food chains in post-Fukushima and post-Chernobyl periods

doi:10.5194/bg-13-3021-2016

	Transfer of radiocaesium from contaminated bottom sediments to marine organisms through benthic food chains in post-Fukushima and post-Chernobyl periods
	Bezhenar, Roman 1; Jung, Kyung Tae 2; Maderich, Vladimir 1; Willemsen, Stefan 3; de With, Govert 3; Qiao, Fangli 4
刊名	BIOGEOSCIENCES
	2016
卷号	13 期号:10 页码:3021-3034
ISSN号	1726-4170
DOI	10.5194/bg-13-3021-2016
英文摘要	After the earthquake and tsunami on 11 March 2011 damaged the Fukushima Dai-ichi Nuclear Power Plant (FDNPP), an accidental release of a large amount of radioactive isotopes into both the air and the ocean occurred. Measurements provided by the Japanese agencies over the past 5 years show that elevated concentrations of Cs-137 still remain in sediments, benthic organisms, and demersal fishes in the coastal zone around the FDNPP. These observations indicate that there are Cs-137 transfer pathways from bottom sediments to the marine organisms. To describe the transfer quantitatively, the dynamic food chain biological uptake model of radionuclides (BURN) has been extended to include benthic marine organisms. The extended model takes into account both pelagic and benthic marine organisms grouped into several classes based on their trophic level and type of species: phytoplankton, zooplankton, and fishes (two types: piscivorous and non-piscivorous) for the pelagic food chain; deposit-feeding invertebrates, demersal fishes fed by benthic invertebrates, and bottom omnivorous predators for the benthic food chain; crustaceans, mollusks, and coastal predators feeding on both pelagic and benthic organisms. Bottom invertebrates ingest organic parts of bottom sediments with adsorbed radionuclides which then migrate up through the food chain. All organisms take radionuclides directly from water as well as food. The model was implemented into the compartment model POSEIDON-R and applied to the north-western Pacific for the period of 1945-2010, and then for the period of 2011-2020 to assess the radiological consequences of Cs-137 released due to the FDNPP accident. The model simulations for activity concentrations of Cs-137 in both pelagic and benthic organisms in the coastal area around the FDNPP agree well with measurements for the period of 2011-2015. The decrease constant in the fitted exponential function of simulated concentration for the deposit-feeding invertebrates (0.45aEuro-yr(-1)) is close to the observed decrease constant in sediments (0.44aEuro-yr(-1)). These results strongly indicate that the gradual decrease of activity in demersal fish (decrease constant is 0.46aEuro-yr(-1)) is caused by the transfer of activity from organic matter deposited in bottom sediment through the deposit-feeding invertebrates. The estimated model transfer coefficient from bulk sediment to demersal fish in the model for 2012-2020 (0.13) is larger than that to the deposit-feeding invertebrates (0.07). In addition, the transfer of Cs-137 through food webs for the period of 1945-2020 has been modelled for the Baltic Sea contaminated due to global fallout and from the Chernobyl accident. The model simulation results obtained with generic parameters are also in good agreement with available measurements in the Baltic Sea. Unlike the open coastal system where the FDNPP is located, the dynamics of radionuclide transfer in the Baltic Sea reach a quasi-steady state due to the slow rate in water mass exchange in this semi-enclosed basin. Obtained results indicate a substantial contribution of the benthic food chain in the long-term transfer of Cs-137 from contaminated bottom sediments to marine organisms and the potential application of a generic model in different regions of the world's oceans.
资助项目	CKJORC (China-Korea Joint Ocean Research Center)[Phi68/12879]
WOS关键词	NUCLEAR-POWER-PLANT ; NORTHWESTERN PACIFIC ; SURFACE WATERS ; WHOLE-BODY ; BIOTA ; DISPERSION ; MODEL ; CS-137 ; RADIONUCLIDES ; ACCIDENT
WOS研究方向	Environmental Sciences & Ecology ; Geology
语种	英语
出版者	COPERNICUS GESELLSCHAFT MBH
WOS记录号	WOS:000378354900011
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/27415]
专题	自然资源部第一海洋研究所
通讯作者	Maderich, Vladimir
作者单位	1.Inst Math Machine & Syst Problems, Glushkov Ave 42, UA-03187 Kiev, Ukraine 2.Korea Inst Ocean Sci & Technol, 787 Haean Ro, Ansan 426744, South Korea 3.NRG, Utrechtseweg 310, NL-6800 ES Arnhem, Netherlands 4.First Inst Oceanog, 6 Xianxialing Rd, Qingdao 266061, Peoples R China
推荐引用方式 GB/T 7714	Bezhenar, Roman,Jung, Kyung Tae,Maderich, Vladimir,et al. Transfer of radiocaesium from contaminated bottom sediments to marine organisms through benthic food chains in post-Fukushima and post-Chernobyl periods[J]. BIOGEOSCIENCES,2016,13(10):3021-3034.
APA	Bezhenar, Roman,Jung, Kyung Tae,Maderich, Vladimir,Willemsen, Stefan,de With, Govert,&Qiao, Fangli.(2016).Transfer of radiocaesium from contaminated bottom sediments to marine organisms through benthic food chains in post-Fukushima and post-Chernobyl periods.BIOGEOSCIENCES,13(10),3021-3034.
MLA	Bezhenar, Roman,et al."Transfer of radiocaesium from contaminated bottom sediments to marine organisms through benthic food chains in post-Fukushima and post-Chernobyl periods".BIOGEOSCIENCES 13.10(2016):3021-3034.