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<p>Mesoscale eddies are widespread in the global ocean, significantly influencing the physical, chemical, and biological structures of water column. Based on the CTD data and suspended particulate matter (SPM) data collected at 36 hydrographic stations during a field cruise in southern Mozambique Channel, combined with satellite altimeter observations, we identified a series of mesoscale eddies traversing the Mozambique Channel. Our hydrographic measurements, coupled with in situ chlorophyll fluorescence data, reveal that these eddies significantly influence thermohaline structure and chlorophyll distribution, which in turn affects primary productivity and SPM concentrations in the upper ocean. The cyclonic eddies facilitate the upwelling of cold subsurface water, leading to a shallowing of the pycnocline and the creation of a low-temperature anomaly with variable salinity anomalies at different depths. Conversely, anticyclonic eddies submerge warm surface water, deepening the pycnocline, and resulting in a high-temperature anomaly accompanied by distinct salinity patterns. Significantly, a coastal anticyclonic eddy was observed to intercept terrestrial material from the Delagoa Bight, redirecting it west of 36°E. This study presents unique and quasi-synchronous CTD datasets capturing mesoscale eddy impacts, and provided valuable insights into SPM variability within the often-neglected southern Mozambique Channel.</p>

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Suspended particulate matter delivery modulated by mesoscale eddies in the southern Mozambique Channel

  • 期刊论文

  • 发表日期：

    2025年3月6日

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  • Libin Zhu,
  • Yong Tang,
  • Houjie Wang,
  • Zhaocai Wu,
  • Limin Hu,
  • Xiao Wu,
  • Naishuang Bi

摘要

Mesoscale eddies are widespread in the global ocean, significantly influencing the physical, chemical, and biological structures of water column. Based on the CTD data and suspended particulate matter (SPM) data collected at 36 hydrographic stations during a field cruise in southern Mozambique Channel, combined with satellite altimeter observations, we identified a series of mesoscale eddies traversing the Mozambique Channel. Our hydrographic measurements, coupled with in situ chlorophyll fluorescence data, reveal that these eddies significantly influence thermohaline structure and chlorophyll distribution, which in turn affects primary productivity and SPM concentrations in the upper ocean. The cyclonic eddies facilitate the upwelling of cold subsurface water, leading to a shallowing of the pycnocline and the creation of a low-temperature anomaly with variable salinity anomalies at different depths. Conversely, anticyclonic eddies submerge warm surface water, deepening the pycnocline, and resulting in a high-temperature anomaly accompanied by distinct salinity patterns. Significantly, a coastal anticyclonic eddy was observed to intercept terrestrial material from the Delagoa Bight, redirecting it west of 36°E. This study presents unique and quasi-synchronous CTD datasets capturing mesoscale eddy impacts, and provided valuable insights into SPM variability within the often-neglected southern Mozambique Channel.