<p>The study examines the current patterns of the upper layer in the region beyond the continental shelf of the South Eastern Arabian Sea (SEAS), encompassing the Lakshadweep Islands. This region demarked as Oceanic-SEAS, is limited in observational data due to the difficulty of deploying drifter buoys near the Islands. However, the presence of strong subsurface chlorophyll maxima, a rich and diverse habitat of organisms viz; Tuna, and like fishes in the subsurface etc., makes the Oceanic-SEAS a potential ecosystem, which needs to be explored for its driving dynamics. The Oceanic SEAS region was divided into two areas, one located near the Islands of Agatti and Minicoy and four deep-water zones surrounding them. A distinctive flow pattern, primarily exhibiting a southerly current (99.79%), was recorded at the Island cluster (around Agatti-10.8°N) with an average velocity of 0.29 ± 0.06&#xa0;m/s, potentially impacted by the Islands, warranting additional investigation. A similar unidirectional flow with seasonal fluctuations was seen near the solitary Island Minicoy (8.5°N) (0.47 ± 0.2&#xa0;m/s), influenced by the combined impacts of Rossby waves and maybe the bathymetric impact of the Islands. The unidirectional flows had a notable weak association with surface winds, which intensified during the summer monsoon. The large-scale, basin-wide circulations had a minimum influence on the currents near the Islands. The robust West India Coastal Current (WICC) and mesoscale eddies were found to control the circulation for the deep-water zones. Intense annual cycles were identified in the offshore currents, except for the southeast region, where a semi-annual mode was present.</p>

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Exploring the upper layer current structure that shapes up the Oceanic South Eastern Arabian Sea ecosystem

  • V. S. Arun,
  • N. N. Vishnu,
  • B. R. Smitha,
  • K. Rajith

摘要

The study examines the current patterns of the upper layer in the region beyond the continental shelf of the South Eastern Arabian Sea (SEAS), encompassing the Lakshadweep Islands. This region demarked as Oceanic-SEAS, is limited in observational data due to the difficulty of deploying drifter buoys near the Islands. However, the presence of strong subsurface chlorophyll maxima, a rich and diverse habitat of organisms viz; Tuna, and like fishes in the subsurface etc., makes the Oceanic-SEAS a potential ecosystem, which needs to be explored for its driving dynamics. The Oceanic SEAS region was divided into two areas, one located near the Islands of Agatti and Minicoy and four deep-water zones surrounding them. A distinctive flow pattern, primarily exhibiting a southerly current (99.79%), was recorded at the Island cluster (around Agatti-10.8°N) with an average velocity of 0.29 ± 0.06 m/s, potentially impacted by the Islands, warranting additional investigation. A similar unidirectional flow with seasonal fluctuations was seen near the solitary Island Minicoy (8.5°N) (0.47 ± 0.2 m/s), influenced by the combined impacts of Rossby waves and maybe the bathymetric impact of the Islands. The unidirectional flows had a notable weak association with surface winds, which intensified during the summer monsoon. The large-scale, basin-wide circulations had a minimum influence on the currents near the Islands. The robust West India Coastal Current (WICC) and mesoscale eddies were found to control the circulation for the deep-water zones. Intense annual cycles were identified in the offshore currents, except for the southeast region, where a semi-annual mode was present.