Dating the age of surficial snow in the Arctic Ocean by<sup> 210</sup>Po-<sup>210</sup>Pb activity disequilibria

Zhong Qiangqiang; Wang Qiugui; Yu Tao; Huang Dekun; Wang Hao; Chen Suiyuan

doi:10.12284/hyxb2022073

Volume 44 Issue 9

Aug. 2022

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Zhong Qiangqiang，Wang Qiugui，Yu Tao, et al. Dating the age of surficial snow in the Arctic Ocean by 210Po-210Pb activity disequilibria[J]. Haiyang Xuebao，2022, 44(9)：63–72 doi: 10.12284/hyxb2022073

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Zhong Qiangqiang，Wang Qiugui，Yu Tao, et al. Dating the age of surficial snow in the Arctic Ocean by²¹⁰Po-²¹⁰Pb activity disequilibria[J]. Haiyang Xuebao，2022, 44(9)：63–72 doi: 10.12284/hyxb2022073

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Dating the age of surficial snow in the Arctic Ocean by²¹⁰Po-²¹⁰Pb activity disequilibria

doi: 10.12284/hyxb2022073

1.
Laboratory of Marine Ecological Environment Early Warning and Monitoring, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
2.
School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
3.
Key Laboratory of Global Change and Marine-Atmospheric Chemistry, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China

Received Date: 2021-10-13
Rev Recd Date: 2021-12-01

Available Online: 2022-04-13

Publish Date: 2022-08-29

Abstract

Abstract

Atmospheric deposition is the most important source for ²¹⁰Po, ²¹⁰Bi, ²¹⁰Pb and ⁷Be radionuclides in the Arctic sea ice regions far away from the influence of rivers and continents. Once the precipitation or snow forms in the Arctic, the falling snow underneath the cloud would be tagged with the specific ²¹⁰Po/²¹⁰Pb activity ratio and be locked into a closed environment; as time elapses, this ratio in snow increases to equilibrium state of ²¹⁰Po-²¹⁰Pb due to ²¹⁰Po ingrowth from the decay of ²¹⁰Pb. From the measured ²¹⁰Po/²¹⁰Pb activity disequilibria in the surficial snow of the Arctic Ocean, its age can be constrained. Here, this research compiled the ²¹⁰Po/²¹⁰Pb activity ratio of aerosol in the Arctic region as the initial ratio for dating snow. The apparent ages of surficial snow in the Arctic Ocean were estimated based on the measured ²¹⁰Po/²¹⁰Pb activity ratio in the surficial snow from the ice stations during the Chinese Ninth Arctic cruise in 2018 and the US GEOTRACES Arctic cruise in 2015. The results showed that the age of snow collected by Chinese ice stations in 2018 ranged from 106 d to 272 d, which was much older than that of snow collected by US ice stations in 2015. The ages of surficial snow showed an obvious latitude effect for both two cruises, indicating that the closer the surficial snow in the Arctic was to the North Pole, the older the snow was. ²¹⁰Po-²¹⁰Pb activity disequilibrium can be used as an effective dating tool combined with passive microwave satellite remote sensing technology to constrain the age of ice/snow in the polar region.
- ²¹⁰Po-²¹⁰Pb activity disequilibria,
- dating,
- age of snow,
- Arctic Ocean

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References(20)

References

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