楚科奇海陆架沉积物中几种低环的多环芳烃的垂直分布特征

于2014年中国第6次北极科学考察期间,采集了楚科奇海陆架4根沉积物柱状样,据此开展了其中几种低环的多环芳烃(PAHs)的总体水平调查,并结合~(210)Pb测年,探讨了其垂直分布特征及历史沉降规律。结果表明,楚科奇海陆架沉积物中几种低环PAHs含量变化范围为50—1 553 ng·g~(–1),总体处于较低水平,且与粒径变化关系不明显。楚科奇海陆架区沉积物的沉积速率为0.05—0.19 cm·a~(–1),低环PAHs垂直变化较小,总体受人类影响极少,局部高值可能受到石油渗漏或成岩作用等过程的影响。

The vertical profile of several low-ring polycyclic aromatic hydrocarbons in sediments of the ChukchiSea shelf

We collected 4 sediment cores in Chukchi Sea shelf during the 6th Chinese Arctic Expedition in 2014, and then surveyed overall level of several low ring PAHs in sediment cores. We discussed the vertical distribution and historical sedimentation of the cores with the 210Pb age dating. The results showed that the concentrations of several individual PAHs in Chukchi Sea shelf sediments varied from 50 to 1 553 ng·g^–1, those low ring PAHs in sediments are generally at a low level and it is not related to the grain size obviously. The sediment rate in Chukchi Sea shelf sediments varied from 0.05 to 0.19 cm·a^–1. Concentrations of low ring PAHs varied slightly in sediment cores, human activities can hardly affect this area. Partial peaks in sediments may influenced by petroleum seep or diagenetic process.