中国渤、黄海柱样中^(239+240)Pu的分布与沉积通量

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

本文对渤海和黄海海域沉积物柱样中^(239+240)Pu数据进行了整理,综合分析了柱样中^(239+240)Pu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+240)Pu的绝对含量。结果表明,渤海和黄海中的^(239+240)Pu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+240)Pu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^(240)Pu/^(239)Pu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+240)Pu沉积通量平均值高于南黄海^(239+240)Pu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+240)Pu的分布特征和污染物来源研究提供一定的科学参考。

The data of ^(239+240)Pu sediment cores in Bohai and Yellow Seas were collected,the source,vertical distributions and inventories of ^(239+240)Pu were comprehensively studied,and the absolute values of ^(239+240)Pu in sediments of Bohai Bay and South Yellow Sea were also estimated.The results showed that ^(239+240)Pu 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+240)Pu distribution types in sediment cores:double peaks,single peak and no peak,respectively.Two types of ^(240)Pu/^(239)Pu in sediment cores,which were stable and unstable(single cycle and multi-cycle),respectively.The average ^(239+240)Pu 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+240)Pu and the source of pollutants in sediment cores of the Bohai and the Yellow Seas.