Distributions of <sup>224, 223</sup>Ra and <sup>137</sup>Cs in the Luzon Strait and its adjacent waters and their response to Typhoon Rainbow

Gu Hequan; Zhao Feng; Yu Wei; Li Ruihuan; Zhao Li; Li Dongmei

doi:10.1007/s13131-019-1508-1

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Article Navigation > Acta Oceanologica Sinica > 2019 > 38(12): 1-7

Gu Hequan, Zhao Feng, Yu Wei, Li Ruihuan, Zhao Li, Li Dongmei. Distributions of 224, 223Ra and 137Cs in the Luzon Strait and its adjacent waters and their response to Typhoon Rainbow[J]. Acta Oceanologica Sinica, 2019, 38(12): 1-7. doi: 10.1007/s13131-019-1508-1

Citation:

Gu Hequan, Zhao Feng, Yu Wei, Li Ruihuan, Zhao Li, Li Dongmei. Distributions of ^{224, 223}Ra and ¹³⁷Cs in the Luzon Strait and its adjacent waters and their response to Typhoon Rainbow[J]. Acta Oceanologica Sinica, 2019, 38(12): 1-7. doi: 10.1007/s13131-019-1508-1

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Distributions of ^{224, 223}Ra and ¹³⁷Cs in the Luzon Strait and its adjacent waters and their response to Typhoon Rainbow

doi: 10.1007/s13131-019-1508-1

1.
South China Sea Environment Monitoring Center, State Oceanic Administration, Guangzhou 510300, China
2.
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China

Received Date: 2019-05-08

Abstract

Abstract

This paper reports the distribution of natural radionuclides of ^{224, 223}Ra in the surface water and stratified waters of the Luzon Strait and its adjacent waters during the cruises of September 2015 and May 2016. To understand the impact of the Fukushima nuclear accident, the artificial radionuclide ¹³⁷Cs in the waters was also analyzed. The results showed that the activities of ^{224, 223}Ra and ¹³⁷Cs were all within the natural radioactive background levels of the marine environment in the South China Sea. ²²⁴Ra had a higher activity level in the water of the north South China Sea to the west of the Luzon Strait, and a lower activity level in the oceanic Philippine Sea to the east. The ¹³⁷Cs activity had no obvious spatial trends. Based on the vertical trends of ²²⁴Ra, ¹³⁷Cs, and water temperature and salinity at three stations (LS3, LS5 and LS8), the distinct characteristics of the activity levels and gradients of ²²⁴Ra and ¹³⁷Cs among the tropical surface water, subsurface water and mid-deep water were revealed. Typhoon Rainbow event reversed the overall circulation of the Luzon Strait and its adjacent area. A huge amount of western Pacific water characterized by low ²²⁴Ra activities flooded into the South China Sea, reducing the activity level of ²²⁴Ra in the waters. However, there were no significant differences of ¹³⁷Cs activity between the West Pacific and the north South China Sea, and ocean current changes had no effect on the ¹³⁷Cs activity levels of the water bodies.
- ²²⁴Ra,
- ²²³Ra,
- Luzon Strait,
- typhoon,
- ¹³⁷Cs

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References(19)

References

Aoyama M, Kajino M, Tanaka T Y, et al. 2016. ¹³⁴Cs and ¹³⁷Cs in the North Pacific Ocean derived from the March 2011 TEPCO Fukushima Dai-ichi Nuclear Power Plant accident, Japan. Part two:estimation of ¹³⁴Cs and ¹³⁷Cs inventories in the North Pacific Ocean. Journal of Oceanography, 72(1):67-76

Bailly du Bois P, Laguionie P, Boust D, et al. 2012. Estimation of marine source-term following Fukushima Dai-ichi accident. Journal of Environmental Radioactivity, 114:2-9, doi: 10.1016/j.jenvrad.2011.11.015

Bronson F L. 2003. Validation of the accuracy of the LabSOCS software for mathematical efficiency calibration of Ge detectors for typical laboratory samples. Journal of Radioanalytical and Nuclear Chemistry, 255(1):137-141, doi: 10.1023/A:1022248318741

Buesseler K O, Charette M A, Pike S M, et al. 2018. Lingering radioactivity at the Bikini and Enewetak Atolls. Science of the Total Environment, 621:1185-1198, doi: 10.1016/j.scitotenv.2017.10.109

Charette M A, Breier C F, Henderson P B, et al. 2013. Radium-based estimates of cesium isotope transport and total direct ocean discharges from the Fukushima Nuclear Power Plant accident. Biogeosciences, 10(3):2159-2167, doi: 10.5194/bg-10-2159-2013

Dulaiova H, Burnett W C. 2008. Evaluation of the flushing rates of Apalachicola Bay, Florida via natural geochemical tracers. Marine Chemistry, 109(3-4):395-408, doi: 10.1016/j.marchem.2007.09.001

Garcia-Solsona E, Garcia-Orellana J, Masqué P, et al. 2008. Uncertainties associated with ²²³Ra and ²²⁴Ra measurements in water via a Delayed Coincidence Counter (RaDeCC). Marine Chemistry, 109(3-4):198-219, doi: 10.1016/j.marchem.2007.11.006

Gu Hequan. 2015. A quantitative study on the sources and sinks of radium isotopes in near-shore waters-taking Changjiang estuary and its adjacent offshore area, Bamen Lagoon, Gaolong Bay and Boao Bay in Hainan for example (in Chinese)[dissertation]. Shanghai:East China Normal University

Hancock G J, Webster I T, Stieglitz T C. 2006. Horizontal mixing of Great Barrier Reef waters:Offshore diffusivity determined from radium isotope distribution. Journal of Geophysical Research, 111(C12):C12019, doi: 10.1029/2006JC003608

Liu Qinyu, Yang Haijun, Li Wei, et al. 2000. Velocity and transport of the zonal current in the Luzon Strait. Haiyang Xuebao (in Chinese), 22(2):1-8

Moore W S. 1976. Sampling ²²⁸Ra in the deep ocean. Deep Sea Research and Oceanographic Abstracts, 23(7):647-651, doi: 10.1016/0011-7471(76)90007-3

Moore W S. 2000. Ages of continental shelf waters determined from ²²³Ra and ²²⁴Ra. Journal of Geophysical Research, 105(C9):22117-22122, doi: 10.1029/1999JC000289

Moore W S. 2007. Seasonal distribution and flux of radium isotopes on the southeastern U. S. continental shelf. Journal of Geophysical Research, 112(C10):C10013, doi: 10.1029/2007JC004199

Moore W S, Arnold R. 1996. Measurement of ²²³Ra and ²²⁴Ra in coastal waters using a delayed coincidence counter. Journal of Geophysical Research, 101(C1):1321-1329, doi: 10.1029/95JC03139

Moore W S, Krest J. 2004. Distribution of ²²³Ra and ²²⁴Ra in the plumes of the Mississippi and Atchafalaya rivers and the Gulf of Mexico. Marine Chemistry, 86(3-4):105-119, doi: 10.1016/j.marchem.2003.10.001

Pan Yuqiu. 2005. China offshore water masses. In:Su Jilan, Yuan Yeli, eds. China Offshore Hydrology (in Chinese). Beijing:China Ocean Press, 167-169

Stachelhaus S L, Moran S B, Ullman D S, et al. 2012. Cross-shelf mixing and mid-shelf front dynamics in the Mid-Atlantic Bight evaluated using the radium quartet. Journal of Marine Research, 70(1):141-172, doi: 10.1357/002224012800502426

Wu J W, Zhou K B, Dai M H. 2012. Impacts of the Fukushima nuclear accident on the China Seas:evaluation based on anthropogenic radionuclide ¹³⁷Cs. Chinese Science Bulletin (in Chinese), 57(32):3100-3108, doi: 10.1007/s11434-012-5426-2

Zhou P, Li D M, Zhao L, et al. 2018. Radioactive status of seawater and its assessment in the northeast South China Sea and the Luzon Strait and its adjacent areas from 2011 to 2014. Marine Pollution Bulletin, 131:163-173, doi: 10.1016/j.marpolbul.2018.04.009

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