厦门近岸<sup>210</sup>Po和<sup>210</sup>Pb的大气沉降通量

张立浩; 杨伟锋; 陈敏; 朱义年; 王宙

doi:10.3969/j.issn.0253-4193.2019.06.011

厦门近岸²¹⁰Po和²¹⁰Pb的大气沉降通量

doi: 10.3969/j.issn.0253-4193.2019.06.011

1.
桂林理工大学广西环境污染控制理论与技术重点实验室, 广西桂林 541004;厦门大学近海海洋环境科学国家重点实验室, 福建厦门 361005
2.
厦门大学近海海洋环境科学国家重点实验室, 福建厦门 361005
3.
桂林理工大学广西环境污染控制理论与技术重点实验室, 广西桂林 541004

基金项目: 国家自然科学基金项目（41476061）；广西环境污染控制理论与技术重点实验室（桂科能1701Z002）；广西中青年教师基础能力提升项目（2019KY0298）；广西科技计划项目（桂科AD18126018）。

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出版历程
- 收稿日期: 2018-10-11
- 修回日期: 2018-12-17

Atmospheric deposition of ²¹⁰ Po and ²¹⁰ Pb near the coast of Xiamen

1.
Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China;State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China
2.
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China
3.
Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China

摘要

摘要: 为揭示中国东南沿海地区²¹⁰Po和²¹⁰Pb的大气沉降时空变化特征，探讨该地区气溶胶的停留时间，于2013年1月至2014年12月对厦门地区²¹⁰Po和²¹⁰Pb的大气沉降通量进行了时间序列研究。结果发现，²¹⁰Po和²¹⁰Pb的平均日沉降通量分别为（65.38±4.79） mBq/（m²·d）（n=54）和（0.78±0.09） Bq/（m²·d）（n=54），表现出明显的周年变化。东北季风期间，²¹⁰Po和²¹⁰Pb的沉降通量较高，而西南季风期间其通量较低。2013年和2014年，²¹⁰Po的年沉降通量分别为19.29 Bq/（m²·a）和9.25 Bq/（m²·a），²¹⁰Pb的年沉降通量分别为159.2 Bq/（m²·a）和189.6 Bq/（m²·a）。两核素的年沉降通量表现出不同程度的年际差异。²¹⁰Po与²¹⁰Pb沉降通量之间存在显著的线性正相关关系，揭示了大气中²¹⁰Po和²¹⁰Pb具有相同的迁出机制，降雨和大气中核素含量是影响²¹⁰Po和²¹⁰Pb沉降通量的主要因素。该研究结果可以为探求台湾海峡海水中²¹⁰Po与²¹⁰Pb的收支平衡提供大气来源项。
- 厦门 /
- ²¹⁰Po /
- ²¹⁰Pb /
- 大气沉降 /
- 气溶胶 /
- 停留时间
Abstract: Atmospheric deposition of ²¹⁰Po and ²¹⁰Pb were measured at a time-series station in the southeast of China (Xiamen) from 2013 to 2014. The daily deposition fluxes of ²¹⁰Po and ²¹⁰Pb are (65.38±4.79)mBq/(m²·d) and (0.78±0.09)Bq/(m²·d), respectively, and the flux values present a significant annual variation. High fluxes occur in months with northeast monsoon, and low values are observed in the southwest monsoon prevailing months. In 2013 and 2014, the yearly deposition fluxes of ²¹⁰Po are 19.29 Bq/(m²·a) and 9.25 Bq/(m²·a), and ²¹⁰Pb fluxes are 159.2 Bq/(m²·a) and 189.6 Bq/(m²·a), respectively. The deposition fluxes of ²¹⁰Po and ²¹⁰Pb show inter-annual variations. There is a significant linear positive correlation between the ²¹⁰Po and ²¹⁰Pb fluxes. In addition, good positive correlations between rainfall and the deposition fluxes of the two nuclides are observed. These results reveal that the predominant removal passage of ²¹⁰Po and ²¹⁰Pb is precipitation along with rainfall, providing insights into understanding the transport of aerosol via ²¹⁰Po and ²¹⁰Pb. The datasets would provide an atmospheric source term for budgeting ²¹⁰Po and ²¹⁰Pb in waters of the western Taiwan Strait.
- Xiamen /
- ²¹⁰Po /
- ²¹⁰Pb /
- atmosphere deposition /
- aerosol /
- residence time

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