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  1. Home
  3. Reverse Cross-latitude Transport Of Iodine-129 To The Northern South China Sea During The Prevailing Summer Monsoon Period.
  1. Home
  3. Reverse Cross-latitude Transport Of Iodine-129 To The Northern South China Sea During The Prevailing Summer Monsoon Period.

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Reverse cross-latitude transport of iodine-129 to the northern South China Sea during the prevailing summer monsoon

Wenkai Wang1, Zhigang Yang2, Luyuan Zhang2

  • 1State Key Laboratory of Loess Science, Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi'an AMS Center, Institute of Earth Environment Chinese Academy of Sciences, Xi'an 710061, China; University of Chinese Academy of Sciences, Beijing 100049, China.

Journal of Hazardous Materials
|February 6, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Radioactive 129I in the South China Sea atmosphere is significantly elevated due to long-range transport from European nuclear facilities. This study analyzes iodine speciation, revealing distinct atmospheric transport and transformation pathways for radioactive and stable iodine.

Keywords:
Atmospheric iodine cyclingCross-latitude transportIodine-127Iodine-129South China SeaSpeciation

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Area of Science:

  • Environmental Science
  • Atmospheric Chemistry
  • Radiochemistry

Background:

  • Understanding radioactive iodine (129I) in marine atmospheres is vital for assessing human impacts and global radionuclide cycles.
  • Previous studies lacked detailed speciation analysis of 129I and stable 127I in remote marine environments.

Purpose of the Study:

  • To conduct the first speciation analysis of radioactive 129I and stable 127I in the northern South China Sea (NSCS) atmosphere.
  • To investigate the sources, transformation, and transport mechanisms of 129I and 127I species.

Main Methods:

  • Speciation analysis of particulate bound iodine (PI), gaseous inorganic iodine (GII), and gaseous organic iodine (GOI).
  • Isotopic ratio measurements (129I/127I).
  • Backward trajectory analysis to identify pollutant transport pathways.

    • Main Results:

    • Atmospheric 129I in the NSCS was 2-3 orders of magnitude higher than natural background levels.
    • Long-range transport from European nuclear reprocessing facilities significantly influences NSCS 129I levels.
    • 127I is dominated by gaseous organic iodine (GOI), while 129I shows higher proportions of particulate bound iodine (PI) and gaseous inorganic iodine (GII).

    Conclusions:

    • Marine atmospheric processes and terrestrial transformations influence iodine speciation.
    • 129I and 127I exhibit distinct atmospheric behaviors and transport pathways.
    • This research provides crucial insights into the hemispheric transport of volatile radionuclides and air pollutants.