scholarly journals The Seasonal Cycle of the South Indian Ocean Subtropical Gyre Circulation as Revealed by Argo and Satellite Data

2018 ◽  
Vol 45 (17) ◽  
pp. 9034-9041 ◽  
Author(s):  
K. McMonigal ◽  
Lisa M. Beal ◽  
Josh K. Willis
Keyword(s):  
Indian Ocean ◽  
Satellite Data ◽  
Seasonal Cycle ◽  
Subtropical Gyre ◽  
The South ◽  
South Indian Ocean ◽  
South Indian ◽  
Gyre Circulation

137Cs water profiles in the South Indian Ocean – An evidence for accumulation of pollutants in the subtropical gyre

2011 ◽  
Vol 89 (1-4) ◽  
pp. 17-30 ◽  
Author(s):  
P.P. Povinec ◽  
M. Aoyama ◽  
M. Fukasawa ◽  
K. Hirose ◽  
K. Komura ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Subtropical Gyre ◽  
The South ◽  
South Indian Ocean ◽  
South Indian ◽  
Accumulation Of Pollutants

scholarly journals Inertially Induced Connections between Subgyres in the South Indian Ocean

2009 ◽  
Vol 39 (2) ◽  
pp. 465-471 ◽  
Author(s):  
V. Palastanga ◽  
H. A. Dijkstra ◽  
W. P. M. de Ruijter
Keyword(s):  
Indian Ocean ◽  
Ocean Basin ◽  
Subtropical Gyre ◽  
Nonlinear Regime ◽  
Water Model ◽  
The South ◽  
South Indian Ocean ◽  
Southern Boundary ◽  
South Indian ◽  
Highly Nonlinear

Abstract A barotropic shallow-water model and continuation techniques are used to investigate steady solutions in an idealized South Indian Ocean basin containing Madagascar. The aim is to study the role of inertia in a possible connection between two subgyres in the South Indian Ocean. By increasing inertial effects in the model, two different circulation regimes are found. In the weakly nonlinear regime, the subtropical gyre presents a recirculation cell in the southwestern basin, with two boundary currents flowing westward from the southern and northern tips of Madagascar toward Africa. In the highly nonlinear regime, the inertial recirculation of the subtropical gyre is found to the east of Madagascar, while the East Madagascar Current overshoots the island’s southern boundary and connects through a southwestward jet with the current off South Africa.

scholarly journals Sediment trap-derived particulate matter fluxes in the oligotrophic subtropical gyre of the South Indian Ocean

2021 ◽  
pp. 104924
Author(s):  
Natalie C. Harms ◽  
Niko Lahajnar ◽  
Birgit Gaye ◽  
Tim Rixen ◽  
Ulrich Schwarz-Schampera ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Indian Ocean ◽  
Sediment Trap ◽  
Subtropical Gyre ◽  
The South ◽  
South Indian Ocean ◽  
South Indian

Impacts of ocean currents on the South Indian Ocean extratropical storm track through the relative wind effect

2021 ◽  
pp. 1-61
Author(s):  
Hyodae Seo ◽  
Hajoon Song ◽  
Larry W. O’Neill ◽  
Matthew R. Mazloff ◽  
Bruce D. Cornuelle
Keyword(s):  
Indian Ocean ◽  
Ocean Circulation ◽  
Storm Track ◽  
Ocean Current ◽  
Wind Effect ◽  
Turbulent Heat ◽  
The South ◽  
South Indian Ocean ◽  
South Indian ◽  
Relative Wind

AbstractThis study examines the role of the relative wind (RW) effect (wind relative to ocean current) in the regional ocean circulation and extratropical storm track in the South Indian Ocean. Comparison of two high-resolution regional coupled model simulations with/without the RW effect reveals that the most conspicuous ocean circulation response is the significant weakening of the overly energetic anticyclonic standing eddy off Port Elizabeth, South Africa, a biased feature ascribed to upstream retroflection of the Agulhas Current (AC). This opens a pathway through which the AC transports the warm and salty water mass from the subtropics, yielding marked increases in sea surface temperature (SST), upward turbulent heat flux (THF), and meridional SST gradient in the Agulhas retroflection region. These thermodynamic and dynamic changes are accompanied by the robust strengthening of the local low-tropospheric baroclinicity and the baroclinic wave activity in the atmosphere. Examination of the composite lifecycle of synoptic-scale storms subjected to the high THF events indicates a robust strengthening of the extratropical storms far downstream. Energetics calculations for the atmosphere suggest that the baroclinic energy conversion from the basic flow is the chief source of increased eddy available potential energy, which is subsequently converted to eddy kinetic energy, providing for the growth of transient baroclinic waves. Overall, the results suggest that the mechanical and thermal air-sea interactions are inherently and inextricably linked together to substantially influence the extratropical storm tracks in the South Indian Ocean.

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