山东半岛东部近岸表层沉积物放射性核素的季节性变化及其环境指示意义

李佩华; 吴晓; 毕乃双; 王厚杰

doi:10.16028/j.1009-2722.2020.112

山东半岛东部近岸表层沉积物放射性核素的季节性变化及其环境指示意义

1.
中国海洋大学海洋地球科学学院，青岛 266100

2.
海底科学与探测技术教育部重点实验室，青岛 266100

基金项目: 国家自然科学基金项目（41525021，U1606401，41530966，41806101）；山东省泰山学者项目（TS20190913）；基金委共享航次（NORC2018-01，NORC 2019-01）

详细信息

作者简介: 李佩华（1994—），男，在读硕士，主要从事海洋沉积动力学方面的研究工作. E-mail：phliouc@163.com

通讯作者: 王厚杰（1972—），男，博士，教授，主要从事海洋沉积动力学方面的研究工作. E-mail：hjwang@ouc.edu.cn

中图分类号: P736.21

收稿日期: 2020-07-27

录用日期: 2021-11-30

刊出日期: 2022-02-28

Seasonal variation of radionuclides in surface sediments off the east coast of Shandong Peninsula and its environmental implications

1.
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China

2.
Key Laboratory of Submarine Geosciences and Technology of Ministry of Education, Qingdao 266100, China

More Information

Corresponding author: WANG Houjie, hjwang@ouc.edu.cn

Received Date: 27 July 2020

Accepted Date: 30 November 2021

Publish Date: 28 February 2022

摘要

摘要:
基于2019年4月、7月、10月、12月渤黄海共享航次取得山东半岛东部近岸H01和H02站位多个季节沉积物样品，通过低本底γ能谱仪分析得到其表层沉积物放射性核素⁷Be、²¹⁰Pb_ex、²²⁸Th_ex和¹³⁷Cs活度数据。结果表明，短半衰期核素⁷Be、²²⁸Th_ex与长半衰期核素²¹⁰Pb_ex、¹³⁷Cs在同一站位的季节分布存在差异，同一核素在H01和H02站位的季节分布也存在差异；H01站位的⁷Be和²²⁸Th_ex，H02站位的²¹⁰Pb_ex和¹³⁷Cs，受表层沉积物粒度影响较不明显，⁷Be和²²⁸Th_ex的季节变化受悬浮物质的输运和沉降的影响显著，而²¹⁰Pb_ex和¹³⁷Cs更多指示的是环流作用下的沉积物再分配；与H02相比，H01站位表层沉积物核素变化受大气沉降影响较低。H01和H02站位分别位于“Ω”形泥质体顶部和东部边缘，其物源和沉积动力环境存在差异，放射性核素⁷Be、²¹⁰Pb_ex、²²⁸Th_ex和¹³⁷Cs在示踪物质输运和沉降过程中具有重要意义。
- 山东半岛东部近岸 /
- 表层沉积物 /
- 季节变化 /
- 放射性核素
Abstract:
Surface sediment samples were collected off the east coast of Shandong Peninsula in April, July, October and December of 2019 respectively. Radionuclides ⁷Be, ²¹⁰Pb_ex, ²²⁸Th_ex and ¹³⁷Cs of the surface sediments are analysed and discussed for different seasons. The results suggest that the seasonal distributions of ⁷Be and ²²⁸Th_ex are different from ²¹⁰Pb_ex and ¹³⁷Cs at same station, and the seasonal distribution of the same radionuclide vary from station to station. The variations of radionuclides seem to have nothing to do with the grain size of surface sediments. The seasonal variations of ⁷Be and ²²⁸Th_ex are significantly affected by the transport and settlement of suspended matter, while ²¹⁰Pb_ex and ¹³⁷Cs are more closely related to sediment redistribution. Comparing to the station H02, the changes of radionuclides in surface sediments at the station H01 are less affected by atmospheric sedimentation. H01 and H02 are located in different parts of the omega-shaped (Ω) mud deposits, owing to different sediment sources and dynamic environments. The study results further confirm that ⁷Be、²¹⁰Pb_ex、²²⁸Th_ex and ¹³⁷Cs are good tracers for illustrating sediment transport and deposition.
- east coast of Shandong Peninsula /
- surface sediments /
- seasonal variations /
- radionuclides

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图 1 研究区域概况

Figure 1.

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图 2 表层沉积物平均粒径和粒级组分季节变化

Figure 2.

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图 3 H01和H02表层沉积物所含核素的季节性变化

Figure 3.

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图 5 H02站位表层沉积物的粒度与放射性核素活度

Figure 5.

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图 4 H01站位表层沉积物的粒度与放射性核素活度

Figure 4.

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图 6 青岛地区⁷Be日均大气沉降通量和月降雨量^[46]

Figure 6.

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图 7 H01和H02站位的悬浮体浓度和表层沉积物放射性核素活度

Figure 7.

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图 8 中国东部海域表层沉积物²¹⁰Pb和¹³⁷Cs的空间分布^[50-51]

Figure 8.

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图 9 中国东部陆架海冬季与夏季环流示意图^[30]

Figure 9.

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图 10 表层沉积物⁷Be/²¹⁰Pb_ex活度比值季节变化和上海、厦门和青岛大气沉降⁷Be/²¹⁰Pb_ex活度比值变化^[44]

Figure 10.

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表 1 表层沉积物采样站位

Table 1. Location of surface sediment sampling stations

季节	站位	采样日期	E/(°)	N/(°)	水深/m
春	H01	2019-04-29	123.01	37.00	29.4
春	H02	2019-04-29	123.50	37.02	72.9
夏	H01	2019-07-27	123.00	37.00	28.0
夏	H02	2019-07-27	123.50	37.00	73.0
秋	H02	2019-10-12	123.51	37.00	73.0
冬	H01	2019-12-18	123.01	37.00	30.4
冬	H02	2019-12-18	123.50	37.00	72.7

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