Distribution of gamma-ray radionuclides in surface sediments of the KongsQorden, Arctic: Implications for sediment provenance  

作　　者：Sheng Zeng Binbin Deng Jinlong Wang Juan Du Jinzhou Du 

机构地区：[1]State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200241,China [2]Monitoring Center of Aquatic Environment of Pearl River Basin,Guangzhou 510611,China [3]Research Centre for Eco-Environmental Engineering,Dongguan University of Technology,Dongguan 523808,China

出　　处：《Acta Oceanologica Sinica》2022年第1期21-29,共9页海洋学报（英文版）

基　　金：The National Natural Science Foundation of China under contract Nos 41706089 and 42107251。

摘　　要：The Kongsfjorden is highly sensitive region to climate variability,however,the study of gamma-ray radionuclides in related areas is relatively scarce.In this study,the grain size,total organic carbon(TOC),13 Corg isotopes,and specific activities of seven gamma nuclides were analysed in surface sediments of the Kongsfjorden in the Arctic during the summer of 2017.The specific activities of 210 Pb_(ex),137 Cs,238 U,226 Ra,228 Ra,228 Th,and 40 K were 12–256 Bq/kg,0–3.8 Bq/kg,25–42 Bq/kg,24–38 Bq/kg,22–40 Bq/kg,22–40 Bq/kg,and 354–738 Bq/kg,respectively,with average values of(121±94)Bq/kg,(2.0±1.2)Bq/kg,(34±6)Bq/kg,(32±4)Bq/kg,(32±6)Bq/kg,(33±6)Bq/kg,and(611±119)Bq/kg.This study observed a significant positive correlation(r=0.845,p<0.05)between TOC and 210 Pb_(ex),highlighting the strong influence of organic matter on the distribution of 210 Pb_(ex).The boundary scavenging of210 Pb from the open sea contributed 27.5%–46.2%to the total 210 Pb_(ex) in the sediments of the outer Kongsfjorden.The grain size was an important factor affecting the activity distribution of several radionuclides(238 U,228 Ra,228 Th,226 Ra,and 40 K).The specific activity of 137 Cs indicated the transport of terrestrial materials from the exposed area of the Kongsfjorden.The sediments in the Kongsfjorden were derived from various material contributions of glacial meltwater debris,glacial rivers,bare soil,atmospheric deposition,and marine sources.This study explains the source of the Kongsfjorden sediment and the distribution characteristics of radionuclides,and illustrateas the main factors affecting the distribution of radionuclides,which provides a reference for the behavior of polar radionuclides in future research.

关 键 词：KONGSFJORDEN sediment TOC RADIONUCLIDE sediment source 

分 类 号：P736.41[天文地球—海洋地质]