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  1. Home
  3. Transport And Fate Of Fukushima-derived 137cs And 134cs In The Seawater Of The Northwest Pacific In 2015.
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  3. Transport And Fate Of Fukushima-derived 137cs And 134cs In The Seawater Of The Northwest Pacific In 2015.

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Transport and fate of Fukushima-derived 137Cs and 134Cs in the seawater of the Northwest Pacific in 2015.

Fenfen Wang1, Wu Men2, Jiang Huang1

  • 1The Laboratory of Marine Ecological and Environmental Early Warning and Monitoring, Third Institute of Oceanography, Ministry of Natural Resources, 184 Daxue Road, Xiamen, 361005, China.

Environmental Science and Pollution Research International
|August 20, 2024

View abstract on PubMed

Summary
This summary is machine-generated.

Fukushima

Keywords:
134Cs137CsDistributionFukushimaLow salinity waterMode waterTransport

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Area of Science:

  • Marine Chemistry
  • Radiological Sciences
  • Oceanography

Background:

  • The Fukushima Daiichi nuclear accident released significant amounts of radiocesium into the marine environment.
  • Understanding the long-term fate and transport of these radionuclides is crucial for assessing environmental impact.

Purpose of the Study:

  • To investigate the distribution and transport of cesium-134 (¹³⁴Cs) and cesium-137 (¹³⁷Cs) in the Northwest Pacific seawater.
  • To assess the influence of the Fukushima accident on marine ecosystems four years post-event.

Main Methods:

  • Seawater sampling in the Northwest Pacific during May and September 2015.
  • Analysis of ¹³⁴Cs and ¹³⁷Cs concentrations in seawater samples.
  • Comparison of radionuclide levels with background data and identification of transport pathways.

Main Results:

  • Fukushima-derived ¹³⁴Cs and ¹³⁷Cs were detectable at some stations four years after the accident.
  • Seawater ¹³⁷Cs and ¹³⁴Cs activities generally decreased from May to September 2015.
  • Evidence of offshore transport of ¹³⁷Cs into the study area was observed in May 2015.
  • Highest ¹³⁷Cs activities were found in the subtropical gyre south of the Kuroshio Extension (KE), while lowest were east of the Luzon Strait.
  • Vertical distribution showed ¹³⁷Cs concentrated at 100–500 m in the subtropical gyre, with some penetration to 500 m.
  • Oyashio Intrusion influenced higher ¹³⁷Cs in upper layers north of the KE.

Conclusions:

  • Radiocesium from Fukushima persists in the Northwest Pacific, with distinct distribution patterns influenced by oceanographic features.
  • Subsurface transport by Northwest Pacific Mode Water and mesoscale eddies contribute to radiocesium dispersal.
  • Water masses like the Oyashio Intrusion play a significant role in the near-surface distribution of ¹³⁷Cs.