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首页> 外文期刊>Journal of oceanography >Cs-134 and Cs-137 in the North Pacific Ocean derived from the March 2011 TEPCO Fukushima Dai-ichi Nuclear Power Plant accident, Japan. Part one: surface pathway and vertical distributions
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Cs-134 and Cs-137 in the North Pacific Ocean derived from the March 2011 TEPCO Fukushima Dai-ichi Nuclear Power Plant accident, Japan. Part one: surface pathway and vertical distributions

机译:北太平洋Cs-134和Cs-137源自2011年3月日本东京电力公司福岛第一核电站事故。第一部分:地面路径和垂直分布

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Activities of radiocaesium released by the Fukushima Dai-ichi Nuclear Power Plant (FNPP1) accident were measured by surface sampling at 408 stations and in vertical profiles at 24 stations in the North Pacific Ocean, and time-series samples were collected at two coastal stations. After July 2012, Cs-137 activity in the surface water near FNPP1 remained around 1000 Bq m(-3), which corresponds to a discharge rate of about 10 GBq day(-1). FNPP1-derived radiocaesium spread eastward in surface water across the mid-latitude North Pacific with a speed of 7 km day(-1) (8 cm s(-1)) until March 2012, and of 3 km day(-1) (3.5 cm s(-1)) from March 2012 through August 2014. In June 2012, Cs-134 activity reached a maximum of 6.12 +/- A 0.50 Bq m(-3) at a 151-m depth (potential density, sigma (theta) = 25.3 kg m(-3)) at 29A degrees N, 165A degrees E. This subsurface maximum, which was also observed along 149A degrees E, might reflect the southward transport of FNPP1-derived radiocaesium in association with the formation and subduction of subtropical mode water (STMW). In June 2012 at 34A degrees N-39A degrees N along 165A degrees E, Cs-134 activity showed a maximum at around sigma (theta) = 26.3 kg m(-3), which corresponds to central mode water (CMW). Cs-134 activity was higher in CMW than in any of the surrounding waters, including STMW. These observations also indicate that the most effective pathway by which FNPP1-derived radiocaesium is introduced into the ocean interior on a 1-year time scale is CMW formation and subduction.
机译:福岛第一核电站事故中释放的放射性铯的活动通过北太平洋408个站点的地面采样和垂直分布的24个站点的垂直剖面进行了测量,并在两个沿海站点采集了时间序列样本。 2012年7月之后,FNPP1附近地表水中的Cs-137活性保持在1000 Bq m(-3)左右,相当于约10 GBq天的排放速率(-1)。 FNPP1衍生的放射性铯在2012年3月之前以7 km day(-1)(8 cm s(-1))的速度在北纬中纬度的北太平洋中部向东扩展到地表水中,并在2012年3月达到3 km day(-1)(从2012年3月至2014年8月为3.5 cm s(-1))。2012年6月,Cs-134的活动深度为151 m(电位密度,sigma)达到最大6.12 +/- A 0.50 Bq m(-3)。在北纬29A,东经165A时θ= 25.3 kg m(-3)。在149A处也观察到该地下最大值,可能反映了FNPP1衍生的放射性铯的向南传输,与地层和地壳有关。亚热带模式水(STMW)的俯冲。在2012年6月,北纬34A度至北纬39A度,东经165A度,Cs-134的活性在sigma(θ)= 26.3 kg m(-3)处显示最大值,相当于中央模式水(CMW)。 CMW中的Cs-134活性高于周围的任何水域,包括STMW。这些观察结果还表明,在1年的时间内将FNPP1衍生的放射性铯引入海洋内部的最有效途径是CMW的形成和俯冲。

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