222Rn指示北部湾北部近海SGD输送的时空特征初探

doi:10.3969/j.issn.1001-909X.2023.02.008

海洋学研究 ›› 2023, Vol. 41 ›› Issue (2): 94-103.DOI: 10.3969/j.issn.1001-909X.2023.02.008

²²²Rn指示北部湾北部近海SGD输送的时空特征初探

佀祥城¹^,²(), 陈晓¹^,², 陈法锦¹^,², 金广哲¹^,²^,^*(), 师梓洋¹^,², 谢旭峰¹^,², 才华³

1.广东海洋大学海洋与气象学院,近海海洋变化与灾害预警实验室,广东湛江 524088
2.广东海洋大学海洋与气象学院,广东省高等学校陆架及深远海气候、资源与环境重点实验室,广东湛江 524088
3.辽宁省公共资源交易中心,辽宁沈阳 110031

收稿日期:2022-03-30 修回日期:2022-10-18 出版日期:2023-06-15 发布日期:2023-07-27
通讯作者: *金广哲(1982—),男,副教授,主要从事海底地下水排泄对近海环境和营养盐迁移转化的影响方面的研究, E-mail:jinguangzhe@live.cn。
作者简介:佀祥城(2000—),男,河南省濮阳市人,主要从事近海陆架区海水-地下水交互方面的研究,E-mail:1532522589@qq.com。
基金资助:
国家自然科学基金项目(U1901213);国家自然科学基金委共享航次项目(NORC2021-11);广东省自然科学基金项目(2019B1515120066);广东省自然科学基金项目(2016A030312004);南方海洋科学与工程广东实验室(湛江)项目(ZJW-2019-08);广东省普通高校创新团队项目(2019KCXTF021);广东省冲一流专项资金项目(080503032101);广东省冲一流专项资金项目(231420003);广东海洋大学大学生创新创业训练计划项目(CXXL2021143)

A preliminary investigation on the spatial and temporal distribution of submarine groundwater discharge in the northern Beibu Gulf as indicated by ²²²Rn activities

SI Xiangcheng¹^,²(), CHEN Xiao¹^,², CHEN Fajin¹^,², JIN Guangzhe¹^,²^,^*(), SHI Ziyang¹^,², XIE Xufeng¹^,², CAI Hua³

1. Laboratory for Coastal Ocean Variation and Disaster Prediction, College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
2. Key Laboratory of Climate, Resources and Environment in Continental Shelf Sea and Deep Sea of Department of Education of Guangdong Province, College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
3. Liaoning Provincial Public Resources Trading Center, Shenyang 110031, China

Received:2022-03-30 Revised:2022-10-18 Online:2023-06-15 Published:2023-07-27

摘要/Abstract

摘要：

放射性同位素氡222 (²²²Rn) 是来源于地层中铀衰变生成的惰性元素。由于其性质稳定,容易测量且在地下水和地表水中活度差异显著,近年来被用作示踪剂广泛应用在海底地下水排泄(submarine groundwater discharge,SGD)的研究中。本文选取北部湾北部海水的²²²Rn活度作为研究对象,通过2021年8月—9月以及12月—次年1月在北部湾北部海域的两个航次采样,分析了北部湾北部海域水体²²²Rn的空间分布和季节性变化特征,并结合²²²Rn的质量平衡模型,估算了北部湾北部海域的SGD通量。结果表明,²²²Rn分布特征受到季节变化和陆源SGD过程的显著影响,冬季²²²Rn活度的平均值与夏季相比减少了约40%。夏季底层水²²²Rn活度较高,断面特征显示SGD过程明显且多集中于研究区北部,而冬季底层水²²²Rn活度较低,断面特征显示SGD过程较弱。通过构建²²²Rn质量平衡模型,估算出北部湾北部海域夏季与冬季SGD速率分别为4.16 cm·d^-1和2.88 cm·d^-1。夏季SGD速率明显高于冬季,且夏季以近岸SGD过程为主,冬季以离岸SGD为主。北部湾北部海域存在着明显的SGD过程,而且由于该区域被陆地和岛屿三面环绕,SGD过程很可能是陆源物质向近岸海域输送的重要自然途径。

关键词: 海底地下水排泄(SGD), 氡同位素(²²²Rn), 质量平衡模型

Abstract:

The radioactive isotope radon-222(²²²Rn) is an inert element derived from the decay of uranium in the earth’s strata. Due to its stability, ease of measurement and significant difference in activity between groundwater and surface water, it has been widely used as a tracer in the study of submarine groundwater discharge (SGD) in recent years. In this study, the ²²²Rn activity of seawater was selected as the object of study, and the spatial and temporal characteristics of ²²²Rn were analyzed, and the SGD flux was estimated through a ²²²Rn mass balance model, based on two cruises of August-September, 2021 and December, 2021-January, 2022 from the northern Beibu Gulf. The results show a spatial and temporal variation of ²²²Rn distribution which was significantly affected by the terrestrial SGD process. The mean ²²²Rn activity decreased by about 40% in winter compared with that in summer. In summer, there show high ²²²Rn activity in bottom water especially from the northern part of the research area with a strong SGD process, but with low ²²²Rn activity in winter with weak SGD process. Based on the ²²²Rn mass balance model, the SGD fluxes of 4.16 cm·d^-1 in summer and 2.88 cm·d^-1 in winter were calculated from the research area, which shows significantly high SGD flux in summer dominant with nearshore SGD and low SGD flux in winter dominant with offshore SGD. Since the research area is surrounded by land and islands, the SGD processes were likely to be an important natural pathway for the terrestrial sources transporting to the nearshore waters.

Key words: submarine groundwater discharge (SGD), radon isotope (²²²Rn), mass balance model

中图分类号:

P641
P731.2

佀祥城, 陈晓, 陈法锦, 金广哲, 师梓洋, 谢旭峰, 才华. ²²²Rn指示北部湾北部近海SGD输送的时空特征初探[J]. 海洋学研究, 2023, 41(2): 94-103.

SI Xiangcheng, CHEN Xiao, CHEN Fajin, JIN Guangzhe, SHI Ziyang, XIE Xufeng, CAI Hua. A preliminary investigation on the spatial and temporal distribution of submarine groundwater discharge in the northern Beibu Gulf as indicated by ²²²Rn activities[J]. Journal of Marine Sciences, 2023, 41(2): 94-103.

图/表 8

图1 北部湾北部采样站位

Fig.1 The sampling sites in the northern Beibu Gulf

图2 北部湾北部夏季底层水222Rn活度分布

Fig.2 Distribution of 222Rn activity from bottom water in the northern Beibu Gulf in summer

图3 北部湾北部冬季底层水222Rn活度分布

Fig.3 Distribution of 222Rn activity from bottom water in the northern Beibu Gulf in winter

图4 北部湾北部夏季S1和S2断面222Rn活度分布

Fig.4 Distribution of 222Rn activity for S1 and S2 sections from the northern Beibu Gulf in summer

图5 北部湾北部冬季S1和S2断面222Rn活度分布

Fig.5 Distribution of 222Rn activity for S1 and S2 sections from the northern Beibu Gulf in winter

图6 北部湾北部夏季SGD速率分布

Fig.6 Distribution of SGD rate in the northern Beibu Gulf in summer

图7 北部湾北部冬季SGD速率分布

Fig.7 Distribution of SGD rate in the northern Beibu Gulf in winter

表1 本研究与我国近海区域SGD速率的比较

Tab.1 Comparison of SGD rates from this study with those from other coastal regions of China

研究区	SGD速率/(cm·d^-1)	参考文献
象山港	0.23~0.69	WU et al^[35]
海南岛西部	0.49~1.5	SU et al^[41]
莱州湾	6.64	ZHANG et al^[42]
吐露港	2.66~5.42	LUO et al^[43]
大亚湾	28~31	WANG et al^[5]
五缘湾	9~29	刘花台等^[44]
北部湾北部	2.88~4.16	本研究

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²²²Rn指示北部湾北部近海SGD输送的时空特征初探

A preliminary investigation on the spatial and temporal distribution of submarine groundwater discharge in the northern Beibu Gulf as indicated by ²²²Rn activities

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