中国渤、黄海柱样中239+240Pu的分布与沉积通量

Vertical distributions and inventories of 239+240Pu in sediment cores of Bohai and Yellow Seas of China

    摘要
  • 摘要: 本文对渤海和黄海海域沉积物柱样中239+240Pu数据进行了整理，综合分析了柱样中239+240Pu的来源、分布特征与沉积通量，同时也初步估算了渤海湾和南黄海海域沉积物中239+240Pu 的绝对含量。结果表明，渤海和黄海中的239+240Pu主要来源于全球大气核试验沉降与太平洋核试验场的输入。沉积物柱样中239+240Pu的比活度主要呈3种分布模式，分别为双峰（多峰）、单峰和无峰。沉积物柱样中240Pu/239Pu原子比值分布呈稳定型和非稳定型（单周期型与多周期型）两种分布模式。渤海湾沉积物柱样中239+240Pu沉积通量平均值高于南黄海239+240Pu的平均值，表明渤海湾属于淤积型海域。本文的结果可以为渤海、黄海沉积物柱样中239+240Pu的分布特征和污染物来源研究提供一定的科学参考。

     

    Abstract: The data of 239+240Pu sediment cores in Bohai and Yellow Seas were collected, the source, vertical distributions and inventories of 239+240Pu were comprehensively studied, and the absolute values of 239+240Pu in sediments of Bohai Bay and South Yellow Sea were also estimated. The results showed that 239+240Pu in the Bohai Sea and Yellow Sea mainly come from global fallout (GF) and Pacific Proving Grounds (PPG) close-in fallout. There are three 239+240Pu distribution types in sediment cores: double peaks, single peak and no peak, respectively. Two types of 240Pu/239Pu in sediment cores, which were stable and unstable (single cycle and multi-cycle), respectively. The average 239+240Pu inventory in Bohai Sea (Bay) was higher than that in South Yellow Sea, that means the Bohai Bay was a siltation type sea area. This study also provides a reference for the future studying of the vertical distributions of 239+240Pu and the source of pollutants in sediment cores of the Bohai and the Yellow Seas.

     

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