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<p>Evaporation ducts, which originate at the air-sea boundary, significantly influence electromagnetic propagation, ship communication, radar ranging, and other related fields. However, the current understanding of the variability in evaporation ducts under the combined effect of atmospheric and oceanic processes remains unclear. Via shipboard observations, the changes in evaporation ducts at paired oceanic submesoscale fronts (OSFs) during and after successive passage of an atmospheric cyclone and anticyclone in the northwestern Pacific Ocean were investigated. The observations indicated that under the dominant influence of sea surface temperature, air temperature, and specific humidity changes, the average evaporation duct height above the OSFs during cyclone passage reached 9.76 m, which is 446% of the 2.19 m during the period when only OSFs occurred. During the anticyclone period, the evaporation duct height ranged from 2 to 3 m. Specific humidity variation was influenced by mainly evaporation, followed by advection and divergence flow. Differences in the influence mechanisms of sea surface temperature and wind speed on evaporation during different periods were explored.</p>

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Evaporation ducts modulated by the coupling of atmospheric cyclones (anticyclones) and oceanic submesoscale fronts: an observational case

  • 期刊论文

  • 发表日期：

    2025年10月25日

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  • Yuan Gao,
  • Yongchui Zhang,
  • Xinyue Xia,
  • Hongcheng Lou,
  • Xiaofeng Zhao,
  • Mei Hong,
  • Yang Wang,
  • Shiyao Chen,
  • Zhijin Qiu,
  • Juli Ding

摘要

Evaporation ducts, which originate at the air-sea boundary, significantly influence electromagnetic propagation, ship communication, radar ranging, and other related fields. However, the current understanding of the variability in evaporation ducts under the combined effect of atmospheric and oceanic processes remains unclear. Via shipboard observations, the changes in evaporation ducts at paired oceanic submesoscale fronts (OSFs) during and after successive passage of an atmospheric cyclone and anticyclone in the northwestern Pacific Ocean were investigated. The observations indicated that under the dominant influence of sea surface temperature, air temperature, and specific humidity changes, the average evaporation duct height above the OSFs during cyclone passage reached 9.76 m, which is 446% of the 2.19 m during the period when only OSFs occurred. During the anticyclone period, the evaporation duct height ranged from 2 to 3 m. Specific humidity variation was influenced by mainly evaporation, followed by advection and divergence flow. Differences in the influence mechanisms of sea surface temperature and wind speed on evaporation during different periods were explored.