Scholarlink

<p>Oceanic coastal trapped waves transmit energy over long distances and influence coastal variability, affecting sea level, currents, temperature, and nutrient fluxes, with consequences for marine ecosystems. Previous studies in the tropical Atlantic have demonstrated the conversion of equatorial Kelvin waves into coastal trapped waves at the eastern boundary. However, the connection between the western tropical Atlantic and the equatorial band has received less attention. Here, we identify an intercontinental oceanic teleconnection linking South America and Africa through the equatorial and coastal waveguides in the Atlantic using a global ocean reanalysis. Intraseasonal (40-130 days) coastal trapped waves propagate northward along the South American coast and occasionally reach the equator, where they convert into equatorial Kelvin waves. These signals cross the basin and subsequently generate coastal trapped waves along the African coast, forming a continuous trapped-wave corridor connecting the continental margins. Episodically, the connection extends further, with waves traced back to the equatorial Pacific. Coastal trapped wave activity exhibits strong seasonal and interannual modulation, controlled by background circulation and large-scale atmospheric forcing associated with the Madden-Julian Oscillation, ENSO, and the Antarctic Oscillation. Our results reveal an unreported pathway for oceanic connectivity across the tropical Atlantic, with potential implications for Atlantic Niño preconditioning.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Planetary trapped waves drive intercontinental and trans-basin oceanic teleconnections between South America and Africa

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月24日

查看全文
  • Léa Poli,
  • Camila Artana,
  • Alex Costa Da Silva,
  • Clément Bricaud,
  • Jean-Michel Lellouche,
  • Boris Dewitte,
  • Ariane Koch-Larrouy,
  • Fabrice Hernandez

摘要

Oceanic coastal trapped waves transmit energy over long distances and influence coastal variability, affecting sea level, currents, temperature, and nutrient fluxes, with consequences for marine ecosystems. Previous studies in the tropical Atlantic have demonstrated the conversion of equatorial Kelvin waves into coastal trapped waves at the eastern boundary. However, the connection between the western tropical Atlantic and the equatorial band has received less attention. Here, we identify an intercontinental oceanic teleconnection linking South America and Africa through the equatorial and coastal waveguides in the Atlantic using a global ocean reanalysis. Intraseasonal (40-130 days) coastal trapped waves propagate northward along the South American coast and occasionally reach the equator, where they convert into equatorial Kelvin waves. These signals cross the basin and subsequently generate coastal trapped waves along the African coast, forming a continuous trapped-wave corridor connecting the continental margins. Episodically, the connection extends further, with waves traced back to the equatorial Pacific. Coastal trapped wave activity exhibits strong seasonal and interannual modulation, controlled by background circulation and large-scale atmospheric forcing associated with the Madden-Julian Oscillation, ENSO, and the Antarctic Oscillation. Our results reveal an unreported pathway for oceanic connectivity across the tropical Atlantic, with potential implications for Atlantic Niño preconditioning.