Impact of Indian Ocean Dipole on the mesoscale eddies and their energy in the Bay of Bengal

Chandra, Navin; Pant, Vimlesh

doi:10.5697/ygvi7171

Artykuł - szczegóły

Tytuł artykułu

Impact of Indian Ocean Dipole on the mesoscale eddies and their energy in the Bay of Bengal

Autorzy

Chandra Navin , Pant Vimlesh

Wybrane pełne teksty z tego czasopisma

Identyfikatory

DOI

10.5697/ygvi7171

Warianty tytułu

Języki publikacji

Abstrakty

Oceanic mesoscale eddies and their physical and dynamical characteristics are studied using a high-resolution numerical model in the Bay of Bengal (BoB), a semi-enclosed bay based in the northeast Indian Ocean (IO). The formation, duration, and kinetic energy of these eddies are primarily influenced by the intensity of surface currents, upper-ocean stratification, and regional bathymetry. The Indian Ocean Dipole (IOD) is a dominant mode of interannual variability in the IO, which influences ocean currents in the BoB apart from the well-known dipole observed in sea surface temperature between eastern and western IO. The high-resolution numerical experiments with positive and negative phases of IOD atmospheric forcing reveal the influence of anomalous circulation prevailing in the negative IOD (nIOD) and positive IOD (pIOD) on mesoscale eddies and their kinetic energy in the BoB. A notable disparity in the eddies’ characteristics was observed in both nIOD and pIOD and compared to normal years. In pIOD or nIOD, the number of eddies enhanced but their average lifespan reduced in the BoB. The increase in eddies was higher (38%) in nIOD than pIOD (11.2%) when compared to normal (non-IOD) years. The contribution of eddies to the total eddy kinetic energy (EKE) of the BoB increased from about 10% in normal years to about 25% in either of the IOD phases. The largest influence of IOD is seen at the thermocline depth. Within the BoB, the Andaman Sea region experienced the largest variations in eddies during IOD years.

Słowa kluczowe

mesoscale eddies Indian Ocean Dipole Bay of Bengal numerical ocean model Eddy kinetic energy

Wydawca

Polish Academy of Sciences, Institute of Oceanology
Elsevier

Czasopismo

Oceanologia

Rocznik

2025

Tom

No. 67 (1)

Strony

Art. no. 67102

Opis fizyczny

Bibliogr. 58 poz., map., rys., tab., wykr.

Twórcy

autor

Chandra Navin

Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, New Delhi, India
National Centre for Medium Range Weather Forecasting, Ministry of Earth Sciences, Noida, India

autor

Pant Vimlesh

vimlesh@cas.iitd.ac.in

Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, New Delhi, India

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