Impact of Indian ocean dipole on the coastal upwelling features off the southwest coast of India

A three-dimensional regional ocean model is used to examine the impact of positive Indian ocean dipole (pIOD) events on the coastal upwelling features at the southwest coast of India (SWCI). Two model experiments are carried out with different surface boundary conditions that prevailed in the normal...

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Bibliographic Details
Published in:Ocean dynamics 2018-06, Vol.68 (6), p.663-676
Main Authors: Nigam, Tanuja, Pant, Vimlesh, Prakash, Kumar Ravi
Format: Article
Language:English
Subjects:
Atmospheric Sciences
Boundary conditions
Chlorophyll
Coastal upwelling
Coastal zone
Coasts
Dipoles
Earth and Environmental Science
Earth Sciences
Ekman transport
Entrainment
Fluid- and Aerodynamics
Geophysics/Geodesy
Heat budget
Heat flux
Heat transfer
Meridional wind
Mixed layer
Monitoring/Environmental Analysis
Ocean circulation
Ocean models
Oceanography
Oceans
Offshore
Phytoplankton
Sea surface
Sea surface temperature
Spatial analysis
Surface temperature
Thermocline
Three dimensional models
Upwelling
Wind stress
Zooplankton
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Summary:A three-dimensional regional ocean model is used to examine the impact of positive Indian ocean dipole (pIOD) events on the coastal upwelling features at the southwest coast of India (SWCI). Two model experiments are carried out with different surface boundary conditions that prevailed in the normal and pIOD years from 1982 to 2010. Model experiments demonstrate the weakening of coastal upwelling at the SWCI in the pIOD years. The reduced southward meridional wind stress off the SWCI leads to comparatively lower offshore Ekman transport during August–October in the pIOD years to that in normal years. The suppressed coastal upwelling results in warmer sea surface temperature and deeper thermocline in the pIOD years during June–September. The offshore spatial extent of upwelled colder (
ISSN:1616-7341
1616-7228
DOI:10.1007/s10236-018-1152-x