Characterizing the Central Structure of a Mesoscale Eddy‐Ring Dipole in the Mozambique Channel From In Situ Observations DOI Creative Commons
Pierrick Penven, Jean‐François Ternon, Margaux Noyon

et al.

Journal of Geophysical Research Oceans, Journal Year: 2025, Volume and Issue: 130(3)

Published: March 1, 2025

Abstract During the RESILIENCE cruise aboard R/V Marion Dufresne II (April 19–24 May 2022), a high‐resolution in situ observation campaign investigated mesoscale dipole Mozambique Channel, composed of large anticyclonic ring and cyclonic eddy. Using an innovative adaptive sampling strategy to track its movement, we employed continuous observing systems, including Moving Vessel Profiler Acoustic Doppler Current Profilers, capture vertical sections. The results revealed distinct dipolar structure: 250 km‐wide featured low chlorophyll homogeneous waters, while smaller eddy exhibited higher concentrations pronounced salinity variations. These include patches, vertically stacked layers, filaments, reflecting mix contrasted water masses from southern Channel Sofala Bank. A central jet between eddies horizontal velocities up 130 cm , facilitating significant offshore transport exceeding 10 Sverdrups upper m emphasizing dipole's role eastward movement. Vertical velocities, derived Quasi‐Geostrophic Omega equation, highlighted influence smaller‐scale structures driving motions, reaching 40 at depth. Lagrangian particle trajectories spiraling structure connectivity coastal waters. findings show that Eddy‐Ring Dipoles efficiently properties continental shelf open ocean, enhancing regional ecosystem connectivity. This work provides new insights into their biogeochemical, biological ecological significance, challenging traditional cyclonic/anticyclonic paradigms, setting foundation for future studies on dipoles region.

Language: Английский

Integrative systematics of the taxonomically complex gobiid genus Glossogobius Gill, 1859 (Teleostei: Gobiidae) from the south-western Indian Ocean, with a description of a new species DOI
Fatah Zarei, Yonela Sithole, Ulrich K. Schliewen

et al.

Zoological Journal of the Linnean Society, Journal Year: 2025, Volume and Issue: 203(4)

Published: April 1, 2025

Abstract Glossogobius, a species-rich gobiid genus with 42 recognized species distributed in the Indo-West Pacific, lacks comprehensive phylogenetic analysis. The highest diversity of occurs tropical West highlighting this region as centre endemism. In contrast, Indian Ocean has lower (nine species). This study offers first thorough description Glossogobius south-western through integrative analyses. Our findings reveal nine lineages, five which are newly identified, including new species, hanisii sp. nov., described from southern Africa and Madagascar. Seven species/lineages, along G. kokius Mauritius tenuiformis, endemic to Ocean. With 65% species/lineages being region, it is identified hotspot genetic structuring these lineages east coast appears be shaped by an interplay between life history, oceanographic conditions, adaptations marine biogeographic regions. Additionally, our highlight Madagascar’s central role diversification evolution unique gobies, provide framework for revision facilitate identification conservation units formulation management measures.

Language: Английский

Citations

0
Characterizing the Central Structure of a Mesoscale Eddy‐Ring Dipole in the Mozambique Channel From In Situ Observations DOI Creative Commons
Pierrick Penven, Jean‐François Ternon, Margaux Noyon

et al.

Journal of Geophysical Research Oceans, Journal Year: 2025, Volume and Issue: 130(3)

Published: March 1, 2025

Abstract During the RESILIENCE cruise aboard R/V Marion Dufresne II (April 19–24 May 2022), a high‐resolution in situ observation campaign investigated mesoscale dipole Mozambique Channel, composed of large anticyclonic ring and cyclonic eddy. Using an innovative adaptive sampling strategy to track its movement, we employed continuous observing systems, including Moving Vessel Profiler Acoustic Doppler Current Profilers, capture vertical sections. The results revealed distinct dipolar structure: 250 km‐wide featured low chlorophyll homogeneous waters, while smaller eddy exhibited higher concentrations pronounced salinity variations. These include patches, vertically stacked layers, filaments, reflecting mix contrasted water masses from southern Channel Sofala Bank. A central jet between eddies horizontal velocities up 130 cm , facilitating significant offshore transport exceeding 10 Sverdrups upper m emphasizing dipole's role eastward movement. Vertical velocities, derived Quasi‐Geostrophic Omega equation, highlighted influence smaller‐scale structures driving motions, reaching 40 at depth. Lagrangian particle trajectories spiraling structure connectivity coastal waters. findings show that Eddy‐Ring Dipoles efficiently properties continental shelf open ocean, enhancing regional ecosystem connectivity. This work provides new insights into their biogeochemical, biological ecological significance, challenging traditional cyclonic/anticyclonic paradigms, setting foundation for future studies on dipoles region.

Language: Английский

Citations

0